Update version.h

Remove version requirement from fmt find_package

CMakeLists.txt

@@ -30,6 +30,11 @@ if(NOT CMAKE_CXX_STANDARD)
     set(CMAKE_CXX_STANDARD_REQUIRED ON)
 endif()
 
+# make sure __cplusplus is defined when using msvc
+if(MSVC)
+    string(APPEND CMAKE_CXX_FLAGS " /Zc:__cplusplus")
+endif()
+
 set(CMAKE_CXX_EXTENSIONS OFF)
 
 if(CMAKE_SYSTEM_NAME MATCHES "CYGWIN" OR CMAKE_SYSTEM_NAME MATCHES "MSYS")
@@ -100,6 +105,7 @@ option(
     SPDLOG_NO_ATOMIC_LEVELS
     "prevent spdlog from using of std::atomic log levels (use only if your code never modifies log levels concurrently"
     OFF)
+option(SPDLOG_DISABLE_DEFAULT_LOGGER "Disable default logger creation" OFF)
 
 # clang-tidy
 if(${CMAKE_VERSION} VERSION_GREATER "3.5")
@@ -123,7 +129,7 @@ if(NOT SPDLOG_FMT_EXTERNAL AND NOT SPDLOG_FMT_EXTERNAL_HO)
     list(APPEND SPDLOG_SRCS src/fmt.cpp)
 endif()
 
-if(SPDLOG_BUILD_SHARED)
+if(SPDLOG_BUILD_SHARED OR BUILD_SHARED_LIBS)
     if(WIN32)
         configure_file(${CMAKE_CURRENT_SOURCE_DIR}/cmake/version.rc.in ${CMAKE_CURRENT_BINARY_DIR}/version.rc @ONLY)
         list(APPEND SPDLOG_SRCS ${CMAKE_CURRENT_BINARY_DIR}/version.rc)
@@ -131,7 +137,8 @@ if(SPDLOG_BUILD_SHARED)
     add_library(spdlog SHARED ${SPDLOG_SRCS} ${SPDLOG_ALL_HEADERS})
     target_compile_definitions(spdlog PUBLIC SPDLOG_SHARED_LIB)
     if(MSVC)
-        target_compile_options(spdlog PUBLIC /wd4251 /wd4275)
+        target_compile_options(spdlog PUBLIC 
+            $<$<AND:$<CXX_COMPILER_ID:MSVC>,$<NOT:$<COMPILE_LANGUAGE:CUDA>>>:/wd4251 /wd4275>)
     endif()
     if(NOT SPDLOG_FMT_EXTERNAL AND NOT SPDLOG_FMT_EXTERNAL_HO)
         target_compile_definitions(spdlog PRIVATE FMT_EXPORT PUBLIC FMT_SHARED)
@@ -171,7 +178,7 @@ target_link_libraries(spdlog_header_only INTERFACE Threads::Threads)
 # ---------------------------------------------------------------------------------------
 if(SPDLOG_FMT_EXTERNAL OR SPDLOG_FMT_EXTERNAL_HO)
     if(NOT TARGET fmt::fmt)
-        find_package(fmt 5.3.0 REQUIRED)
+        find_package(fmt CONFIG REQUIRED)
     endif()
     target_compile_definitions(spdlog PUBLIC SPDLOG_FMT_EXTERNAL)
     target_compile_definitions(spdlog_header_only INTERFACE SPDLOG_FMT_EXTERNAL)
@@ -188,6 +195,14 @@ if(SPDLOG_FMT_EXTERNAL OR SPDLOG_FMT_EXTERNAL_HO)
     set(PKG_CONFIG_REQUIRES fmt) # add dependency to pkg-config
 endif()
 
+# ---------------------------------------------------------------------------------------
+# Add required libraries for Android CMake build
+# ---------------------------------------------------------------------------------------
+if (ANDROID)
+    target_link_libraries(spdlog PUBLIC log)
+    target_link_libraries(spdlog_header_only INTERFACE log)
+endif ()
+
 # ---------------------------------------------------------------------------------------
 # Misc definitions according to tweak options
 # ---------------------------------------------------------------------------------------
@@ -201,7 +216,8 @@ foreach(
     SPDLOG_PREVENT_CHILD_FD
     SPDLOG_NO_THREAD_ID
     SPDLOG_NO_TLS
-    SPDLOG_NO_ATOMIC_LEVELS)
+    SPDLOG_NO_ATOMIC_LEVELS
+    SPDLOG_DISABLE_DEFAULT_LOGGER)
     if(${SPDLOG_OPTION})
         target_compile_definitions(spdlog PUBLIC ${SPDLOG_OPTION})
         target_compile_definitions(spdlog_header_only INTERFACE ${SPDLOG_OPTION})
@@ -289,3 +305,4 @@ if(SPDLOG_INSTALL)
     # ---------------------------------------------------------------------------------------
     include(cmake/spdlogCPack.cmake)
 endif()
+

README.md

@@ -31,6 +31,8 @@ $ cmake .. && make -j
 * vcpkg: `vcpkg install spdlog`
 * conan: `spdlog/[>=1.4.1]`
 * conda: `conda install -c conda-forge spdlog`
+* build2: ```depends: spdlog ^1.8.2```
+
 
 
 ## Features
@@ -45,7 +47,8 @@ $ cmake .. && make -j
     * Daily log files.
     * Console logging (colors supported).
     * syslog.
-    * Windows debugger (```OutputDebugString(..)```)
+    * Windows event log.
+    * Windows debugger (```OutputDebugString(..)```).
     * Easily extendable with custom log targets  (just implement a single function in the [sink](include/spdlog/sinks/sink.h) interface).
 * Log filtering - log levels can be modified in runtime as well as in compile time.
 * Support for loading log levels from argv or from environment var.
@@ -188,6 +191,7 @@ void stopwatch_example()
 // {:s} - don't separate each byte with space.
 // {:p} - don't print the position on each line start.
 // {:n} - don't split the output to lines.
+// {:a} - show ASCII if :n is not set.
 
 #include "spdlog/fmt/bin_to_hex.h"
 

appveyor.yml

@@ -4,32 +4,52 @@ environment:
   matrix:
     - GENERATOR: '"Visual Studio 14 2015"'
       BUILD_TYPE: Debug
-      WCHAR: 'OFF'
       BUILD_SHARED: 'OFF'
+      WCHAR: 'OFF'
+      WCHAR_FILES: 'OFF'
+      BUILD_EXAMPLE: 'ON'
     - GENERATOR: '"Visual Studio 14 2015"'
       BUILD_TYPE: Release
-      WCHAR: 'ON'
       BUILD_SHARED: 'OFF'
+      WCHAR: 'ON'
+      WCHAR_FILES: 'OFF'
+      BUILD_EXAMPLE: 'ON'
     - GENERATOR: '"Visual Studio 14 2015 Win64"'
       BUILD_TYPE: Debug
-      WCHAR: 'ON'
       BUILD_SHARED: 'OFF'
+      WCHAR: 'ON'
+      WCHAR_FILES: 'OFF'
+      BUILD_EXAMPLE: 'ON'
     - GENERATOR: '"Visual Studio 14 2015 Win64"'
       BUILD_TYPE: Release
-      WCHAR: 'ON'
       BUILD_SHARED: 'OFF'
+      WCHAR: 'ON'
+      WCHAR_FILES: 'OFF'
+      BUILD_EXAMPLE: 'ON'
     - GENERATOR: '"Visual Studio 15 2017 Win64"'
       BUILD_TYPE: Debug
+      BUILD_SHARED: 'OFF'
       WCHAR: 'ON'
-      BUILD_SHARED: 'OFF'
+      WCHAR_FILES: 'OFF'
+      BUILD_EXAMPLE: 'ON'
     - GENERATOR: '"Visual Studio 15 2017 Win64"'
       BUILD_TYPE: Release
-      WCHAR: 'OFF'
       BUILD_SHARED: 'OFF'
+      WCHAR: 'OFF'
+      WCHAR_FILES: 'OFF'
+      BUILD_EXAMPLE: 'ON'
     - GENERATOR: '"Visual Studio 15 2017 Win64"'
       BUILD_TYPE: Release
-      WCHAR: 'OFF'
       BUILD_SHARED: 'ON'
+      WCHAR: 'OFF'
+      WCHAR_FILES: 'OFF'
+      BUILD_EXAMPLE: 'ON'
+    - GENERATOR: '"Visual Studio 15 2017 Win64"'
+      BUILD_TYPE: Release
+      BUILD_SHARED: 'ON'
+      WCHAR: 'ON'
+      WCHAR_FILES: 'ON'
+      BUILD_EXAMPLE: 'OFF'
 build_script:
   - cmd: >-
       set
@@ -40,7 +60,7 @@ build_script:
 
       set PATH=%PATH%;C:\Program Files\Git\usr\bin
 
-      cmake .. -G %GENERATOR% -DCMAKE_BUILD_TYPE=%BUILD_TYPE% -DSPDLOG_WCHAR_SUPPORT=%WCHAR% -DSPDLOG_BUILD_SHARED=%BUILD_SHARED% -DSPDLOG_BUILD_EXAMPLE=ON -DSPDLOG_BUILD_EXAMPLE_HO=ON -DSPDLOG_BUILD_TESTS=ON -DSPDLOG_BUILD_TESTS_HO=OFF -DSPDLOG_BUILD_WARNINGS=ON
+      cmake -G %GENERATOR% -D CMAKE_BUILD_TYPE=%BUILD_TYPE% -D BUILD_SHARED_LIBS=%BUILD_SHARED% -D SPDLOG_WCHAR_SUPPORT=%WCHAR% -D SPDLOG_WCHAR_FILENAMES=%WCHAR_FILES% -D SPDLOG_BUILD_EXAMPLE=%BUILD_EXAMPLE% -D SPDLOG_BUILD_EXAMPLE_HO=%BUILD_EXAMPLE% -D SPDLOG_BUILD_TESTS=ON -D SPDLOG_BUILD_TESTS_HO=OFF -D SPDLOG_BUILD_WARNINGS=ON ..
 
       cmake --build . --config %BUILD_TYPE%
 

bench/CMakeLists.txt

@@ -9,7 +9,24 @@ if(NOT TARGET spdlog)
 endif()
 
 find_package(Threads REQUIRED)
-find_package(benchmark CONFIG REQUIRED)
+find_package(benchmark CONFIG)
+if (NOT benchmark_FOUND)
+    message(STATUS "Using CMake Version ${CMAKE_VERSION}")
+    if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.11.0")
+        # User can fetch googlebenchmark 			
+        message(STATUS "Downloading GoogleBenchmark")
+        include(FetchContent)
+        set(BENCHMARK_ENABLE_GTEST_TESTS OFF CACHE INTERNAL "")
+        # Do not build and run googlebenchmark tests
+        FetchContent_Declare(googlebenchmark
+            GIT_REPOSITORY https://github.com/google/benchmark.git
+            GIT_TAG v1.5.2)
+
+        FetchContent_MakeAvailable(googlebenchmark)
+    else()
+        message(FATAL_ERROR "GoogleBenchmark is missing. Use CMake >= 3.11 or download it")
+    endif()
+endif()
 
 add_executable(bench bench.cpp)
 spdlog_enable_warnings(bench)

bench/async_bench.cpp

@@ -9,7 +9,12 @@
 #include "spdlog/spdlog.h"
 #include "spdlog/async.h"
 #include "spdlog/sinks/basic_file_sink.h"
+
+#ifdef SPDLOG_FMT_EXTERNAL
+#include <fmt/locale.h>
+#else
 #include "spdlog/fmt/bundled/locale.h"
+#endif
 
 #include "utils.h"
 #include <atomic>

bench/bench.cpp

@@ -11,7 +11,12 @@
 #include "spdlog/sinks/daily_file_sink.h"
 #include "spdlog/sinks/null_sink.h"
 #include "spdlog/sinks/rotating_file_sink.h"
+
+#ifdef SPDLOG_FMT_EXTERNAL
+#include <fmt/locale.h>
+#else
 #include "spdlog/fmt/bundled/locale.h"
+#endif
 
 #include "utils.h"
 #include <atomic>

bench/formatter-bench.cpp

@@ -34,14 +34,14 @@ void bench_formatters()
     for (auto &flag : all_flags)
     {
         auto pattern = std::string("%") + flag;
-        benchmark::RegisterBenchmark(pattern.c_str(), bench_formatter, pattern);
+        benchmark::RegisterBenchmark(pattern.c_str(), &bench_formatter, pattern);
 
         //        pattern = std::string("%16") + flag;
-        //        benchmark::RegisterBenchmark(pattern.c_str(), bench_formatter, pattern);
+        //        benchmark::RegisterBenchmark(pattern.c_str(), &bench_formatter, pattern);
         //
         //        // bench center padding
         //        pattern = std::string("%=16") + flag;
-        //        benchmark::RegisterBenchmark(pattern.c_str(), bench_formatter, pattern);
+        //        benchmark::RegisterBenchmark(pattern.c_str(), &bench_formatter, pattern);
     }
 
     // complex patterns
@@ -52,7 +52,7 @@ void bench_formatters()
     };
     for (auto &pattern : patterns)
     {
-        benchmark::RegisterBenchmark(pattern.c_str(), bench_formatter, pattern)->Iterations(2500000);
+        benchmark::RegisterBenchmark(pattern.c_str(), &bench_formatter, pattern)->Iterations(2500000);
     }
 }
 
@@ -73,7 +73,7 @@ int main(int argc, char *argv[])
     }
     else
     {
-        benchmark::RegisterBenchmark(pattern.c_str(), bench_formatter, pattern);
+        benchmark::RegisterBenchmark(pattern.c_str(), &bench_formatter, pattern);
     }
     benchmark::Initialize(&argc, argv);
     benchmark::RunSpecifiedBenchmarks();

cmake/spdlogCPack.cmake

@@ -18,23 +18,37 @@ set(CPACK_PACKAGE_RELOCATABLE ON CACHE BOOL "Build relocatable package")
 
 set(CPACK_RPM_PACKAGE_LICENSE "MIT")
 set(CPACK_RPM_PACKAGE_GROUP "Development/Libraries")
+set(CPACK_DEBIAN_PACKAGE_SECTION "libs")
 set(CPACK_RPM_PACKAGE_URL ${CPACK_PROJECT_URL})
+set(CPACK_DEBIAN_PACKAGE_HOMEPAGE ${CPACK_PROJECT_URL})
 set(CPACK_RPM_PACKAGE_DESCRIPTION "Very fast, header-only/compiled, C++ logging library.")
+set(CPACK_DEBIAN_PACKAGE_DESCRIPTION "Very fast, header-only/compiled, C++ logging library.")
 
 if(CPACK_PACKAGE_NAME)
     set(CPACK_RPM_FILE_NAME "${CPACK_PACKAGE_NAME}-${CPACK_PACKAGE_VERSION}")
+    set(CPACK_DEBIAN_FILE_NAME "${CPACK_PACKAGE_NAME}-${CPACK_PACKAGE_VERSION}")
 else()
     set(CPACK_RPM_FILE_NAME "${PROJECT_NAME}-${CPACK_PACKAGE_VERSION}")
+    set(CPACK_DEBIAN_FILE_NAME "${PROJECT_NAME}-${CPACK_PACKAGE_VERSION}")
+    set(CPACK_RPM_PACKAGE_NAME "${PROJECT_NAME}")
+    set(CPACK_DEBIAN_PACKAGE_NAME "${PROJECT_NAME}")
 endif()
 
 if(CPACK_RPM_PACKAGE_RELEASE)
     set(CPACK_RPM_FILE_NAME "${CPACK_RPM_FILE_NAME}-${CPACK_RPM_PACKAGE_RELEASE}")
 endif()
+if(CPACK_DEBIAN_PACKAGE_RELEASE)
+    set(CPACK_DEBIAN_FILE_NAME "${CPACK_DEBIAN_FILE_NAME}-${CPACK_DEBIAN_PACKAGE_RELEASE}")
+endif()
 
 if(CPACK_RPM_PACKAGE_ARCHITECTURE)
     set(CPACK_RPM_FILE_NAME "${CPACK_RPM_FILE_NAME}.${CPACK_RPM_PACKAGE_ARCHITECTURE}")
 endif()
+if(CPACK_DEBIAN_PACKAGE_ARCHITECTURE)
+    set(CPACK_DEBIAN_FILE_NAME "${CPACK_DEBIAN_FILE_NAME}.${CPACK_DEBIAN_PACKAGE_ARCHITECTURE}")
+endif()
 set(CPACK_RPM_FILE_NAME "${CPACK_RPM_FILE_NAME}.rpm")
+set(CPACK_DEBIAN_FILE_NAME "${CPACK_DEBIAN_FILE_NAME}.deb")
 
 if(NOT CPACK_PACKAGE_RELOCATABLE)
     # Depend on pkgconfig rpm to create the system pkgconfig folder

cmake/utils.cmake

@@ -59,3 +59,4 @@ function(spdlog_enable_sanitizer target_name)
     target_compile_options(${target_name} PRIVATE -fno-omit-frame-pointer)
     target_link_libraries(${target_name} PRIVATE -fsanitize=address,undefined -fuse-ld=gold)
 endfunction()
+

example/example.cpp

@@ -22,7 +22,7 @@ void syslog_example();
 void custom_flags_example();
 
 #include "spdlog/spdlog.h"
-#include "spdlog/cfg/env.h" // for loading levels from the environment variable
+#include "spdlog/cfg/env.h" // support for loading levels from the environment variable
 
 int main(int, char *[])
 {

include/spdlog/cfg/helpers-inl.h

@@ -11,6 +11,7 @@
 #include <spdlog/details/os.h>
 #include <spdlog/details/registry.h>
 
+#include <algorithm>
 #include <string>
 #include <utility>
 #include <sstream>

include/spdlog/common-inl.h

@@ -9,15 +9,24 @@
 
 namespace spdlog {
 namespace level {
+
+#if __cplusplus >= 201703L
+constexpr
+#endif
 static string_view_t level_string_views[] SPDLOG_LEVEL_NAMES;
 
 static const char *short_level_names[] SPDLOG_SHORT_LEVEL_NAMES;
 
-SPDLOG_INLINE string_view_t &to_string_view(spdlog::level::level_enum l) SPDLOG_NOEXCEPT
+SPDLOG_INLINE const string_view_t &to_string_view(spdlog::level::level_enum l) SPDLOG_NOEXCEPT
 {
     return level_string_views[l];
 }
 
+SPDLOG_INLINE void set_string_view(spdlog::level::level_enum l, const string_view_t &s) SPDLOG_NOEXCEPT
+{
+    level_string_views[l] = s;
+}
+
 SPDLOG_INLINE const char *to_short_c_str(spdlog::level::level_enum l) SPDLOG_NOEXCEPT
 {
     return short_level_names[l];

include/spdlog/common.h

@@ -88,7 +88,9 @@ class sink;
 
 #if defined(_WIN32) && defined(SPDLOG_WCHAR_FILENAMES)
 using filename_t = std::wstring;
-#define SPDLOG_FILENAME_T(s) L##s
+// allow macro expansion to occur in SPDLOG_FILENAME_T
+#define SPDLOG_FILENAME_T_INNER(s) L##s
+#define SPDLOG_FILENAME_T(s) SPDLOG_FILENAME_T_INNER(s)
 #else
 using filename_t = std::string;
 #define SPDLOG_FILENAME_T(s) s
@@ -101,6 +103,7 @@ using err_handler = std::function<void(const std::string &err_msg)>;
 using string_view_t = fmt::basic_string_view<char>;
 using wstring_view_t = fmt::basic_string_view<wchar_t>;
 using memory_buf_t = fmt::basic_memory_buffer<char, 250>;
+using wmemory_buf_t = fmt::basic_memory_buffer<wchar_t, 250>;
 
 #ifdef SPDLOG_WCHAR_TO_UTF8_SUPPORT
 #ifndef _WIN32
@@ -163,7 +166,8 @@ enum level_enum
     }
 #endif
 
-SPDLOG_API string_view_t &to_string_view(spdlog::level::level_enum l) SPDLOG_NOEXCEPT;
+SPDLOG_API const string_view_t &to_string_view(spdlog::level::level_enum l) SPDLOG_NOEXCEPT;
+SPDLOG_API void set_string_view(spdlog::level::level_enum l, const string_view_t &s) SPDLOG_NOEXCEPT;
 SPDLOG_API const char *to_short_c_str(spdlog::level::level_enum l) SPDLOG_NOEXCEPT;
 SPDLOG_API spdlog::level::level_enum from_str(const std::string &name) SPDLOG_NOEXCEPT;
 
@@ -203,8 +207,8 @@ private:
     std::string msg_;
 };
 
-SPDLOG_API void throw_spdlog_ex(const std::string &msg, int last_errno);
+[[noreturn]] SPDLOG_API void throw_spdlog_ex(const std::string &msg, int last_errno);
-SPDLOG_API void throw_spdlog_ex(std::string msg);
+[[noreturn]] SPDLOG_API void throw_spdlog_ex(std::string msg);
 
 struct source_loc
 {

include/spdlog/details/file_helper-inl.h

@@ -29,12 +29,27 @@ SPDLOG_INLINE void file_helper::open(const filename_t &fname, bool truncate)
 {
     close();
     filename_ = fname;
-    auto *mode = truncate ? SPDLOG_FILENAME_T("wb") : SPDLOG_FILENAME_T("ab");
+
+    auto *mode = SPDLOG_FILENAME_T("ab");
+    auto *trunc_mode = SPDLOG_FILENAME_T("wb");
 
     for (int tries = 0; tries < open_tries_; ++tries)
     {
         // create containing folder if not exists already.
         os::create_dir(os::dir_name(fname));
+        if (truncate)
+        {
+            // Truncate by opening-and-closing a tmp file in "wb" mode, always
+            // opening the actual log-we-write-to in "ab" mode, since that
+            // interacts more politely with eternal processes that might
+            // rotate/truncate the file underneath us.
+            std::FILE *tmp;
+            if (os::fopen_s(&tmp, fname, trunc_mode))
+            {
+                continue;
+            }
+            std::fclose(tmp);
+        }
         if (!os::fopen_s(&fd_, fname, mode))
         {
             return;
@@ -118,7 +133,7 @@ SPDLOG_INLINE std::tuple<filename_t, filename_t> file_helper::split_by_extension
     }
 
     // treat cases like "/etc/rc.d/somelogfile or "/abc/.hiddenfile"
-    auto folder_index = fname.rfind(details::os::folder_sep);
+    auto folder_index = fname.find_last_of(details::os::folder_seps_filename);
     if (folder_index != filename_t::npos && folder_index >= ext_index - 1)
     {
         return std::make_tuple(fname, filename_t());

include/spdlog/details/log_msg_buffer-inl.h

@@ -26,7 +26,9 @@ SPDLOG_INLINE log_msg_buffer::log_msg_buffer(const log_msg_buffer &other)
     update_string_views();
 }
 
-SPDLOG_INLINE log_msg_buffer::log_msg_buffer(log_msg_buffer &&other) SPDLOG_NOEXCEPT : log_msg{other}, buffer{std::move(other.buffer)}
+SPDLOG_INLINE log_msg_buffer::log_msg_buffer(log_msg_buffer &&other) SPDLOG_NOEXCEPT 
+    : log_msg{other}
+    , buffer{std::move(other.buffer)}
 {
     update_string_views();
 }

include/spdlog/details/mpmc_blocking_q.h

@@ -110,6 +110,12 @@ public:
         return q_.overrun_counter();
     }
 
+    size_t size()
+    {
+        std::unique_lock<std::mutex> lock(queue_mutex_);
+        return q_.size();
+    }
+
 private:
     std::mutex queue_mutex_;
     std::condition_variable push_cv_;

include/spdlog/details/os-inl.h

@@ -397,17 +397,26 @@ SPDLOG_INLINE bool is_color_terminal() SPDLOG_NOEXCEPT
 #ifdef _WIN32
     return true;
 #else
-    static constexpr std::array<const char *, 14> terms = {
-        {"ansi", "color", "console", "cygwin", "gnome", "konsole", "kterm", "linux", "msys", "putty", "rxvt", "screen", "vt100", "xterm"}};
 
-    const char *env_p = std::getenv("TERM");
+    static const bool result = []() {
-    if (env_p == nullptr)
+        const char *env_colorterm_p = std::getenv("COLORTERM");
-    {
+        if (env_colorterm_p != nullptr)
-        return false;
+        {
-    }
+            return true;
+        }
+
+        static constexpr std::array<const char *, 15> terms = {{"ansi", "color", "console", "cygwin", "gnome", "konsole", "kterm", "linux",
+            "msys", "putty", "rxvt", "screen", "vt100", "xterm", "alacritty"}};
+
+        const char *env_term_p = std::getenv("TERM");
+        if (env_term_p == nullptr)
+        {
+            return false;
+        }
+
+        return std::any_of(terms.begin(), terms.end(), [&](const char *term) { return std::strstr(env_term_p, term) != nullptr; });
+    }();
 
-    static const bool result =
-        std::any_of(terms.begin(), terms.end(), [&](const char *term) { return std::strstr(env_p, term) != nullptr; });
     return result;
 #endif
 }
@@ -427,7 +436,7 @@ SPDLOG_INLINE bool in_terminal(FILE *file) SPDLOG_NOEXCEPT
 #if (defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT) || defined(SPDLOG_WCHAR_FILENAMES)) && defined(_WIN32)
 SPDLOG_INLINE void wstr_to_utf8buf(wstring_view_t wstr, memory_buf_t &target)
 {
-    if (wstr.size() > static_cast<size_t>((std::numeric_limits<int>::max)()))
+    if (wstr.size() > static_cast<size_t>((std::numeric_limits<int>::max)()) / 2 - 1)
     {
         throw_spdlog_ex("UTF-16 string is too big to be converted to UTF-8");
     }
@@ -459,6 +468,41 @@ SPDLOG_INLINE void wstr_to_utf8buf(wstring_view_t wstr, memory_buf_t &target)
 
     throw_spdlog_ex(fmt::format("WideCharToMultiByte failed. Last error: {}", ::GetLastError()));
 }
+
+SPDLOG_INLINE void utf8_to_wstrbuf(string_view_t str, wmemory_buf_t &target)
+{
+    if (str.size() > static_cast<size_t>((std::numeric_limits<int>::max)()) - 1)
+    {
+        throw_spdlog_ex("UTF-8 string is too big to be converted to UTF-16");
+    }
+
+    int str_size = static_cast<int>(str.size());
+    if (str_size == 0)
+    {
+        target.resize(0);
+        return;
+    }
+
+    int result_size = static_cast<int>(target.capacity());
+    if (str_size + 1 > result_size)
+    {
+        result_size = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, str.data(), str_size, NULL, 0);
+    }
+
+    if (result_size > 0)
+    {
+        target.resize(result_size);
+        result_size = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, str.data(), str_size, target.data(), result_size);
+
+        if (result_size > 0)
+        {
+            target.resize(result_size);
+            return;
+        }
+    }
+
+    throw_spdlog_ex(fmt::format("MultiByteToWideChar failed. Last error: {}", ::GetLastError()));
+}
 #endif // (defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT) || defined(SPDLOG_WCHAR_FILENAMES)) && defined(_WIN32)
 
 // return true on success
@@ -489,15 +533,10 @@ SPDLOG_INLINE bool create_dir(filename_t path)
         return false;
     }
 
-#ifdef _WIN32
-    // support forward slash in windows
-    std::replace(path.begin(), path.end(), '/', folder_sep);
-#endif
-
     size_t search_offset = 0;
     do
     {
-        auto token_pos = path.find(folder_sep, search_offset);
+        auto token_pos = path.find_first_of(folder_seps_filename, search_offset);
         // treat the entire path as a folder if no folder separator not found
         if (token_pos == filename_t::npos)
         {
@@ -523,11 +562,7 @@ SPDLOG_INLINE bool create_dir(filename_t path)
 // "abc///" => "abc//"
 SPDLOG_INLINE filename_t dir_name(filename_t path)
 {
-#ifdef _WIN32
+    auto pos = path.find_last_of(folder_seps_filename);
-    // support forward slash in windows
-    std::replace(path.begin(), path.end(), '/', folder_sep);
-#endif
-    auto pos = path.find_last_of(folder_sep);
     return pos != filename_t::npos ? path.substr(0, pos) : filename_t{};
 }
 

include/spdlog/details/os.h

@@ -32,11 +32,16 @@ SPDLOG_API std::tm gmtime() SPDLOG_NOEXCEPT;
 SPDLOG_CONSTEXPR static const char *default_eol = SPDLOG_EOL;
 
 // folder separator
+#if !defined(SPDLOG_FOLDER_SEPS)
 #ifdef _WIN32
-static const char folder_sep = '\\';
+#define SPDLOG_FOLDER_SEPS "\\/"
 #else
-SPDLOG_CONSTEXPR static const char folder_sep = '/';
+#define SPDLOG_FOLDER_SEPS "/"
 #endif
+#endif
+
+SPDLOG_CONSTEXPR static const char folder_seps[] = SPDLOG_FOLDER_SEPS;
+SPDLOG_CONSTEXPR static const filename_t::value_type folder_seps_filename[] = SPDLOG_FILENAME_T(SPDLOG_FOLDER_SEPS);
 
 // fopen_s on non windows for writing
 SPDLOG_API bool fopen_s(FILE **fp, const filename_t &filename, const filename_t &mode);
@@ -85,6 +90,8 @@ SPDLOG_API bool in_terminal(FILE *file) SPDLOG_NOEXCEPT;
 
 #if (defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT) || defined(SPDLOG_WCHAR_FILENAMES)) && defined(_WIN32)
 SPDLOG_API void wstr_to_utf8buf(wstring_view_t wstr, memory_buf_t &target);
+
+SPDLOG_API void utf8_to_wstrbuf(string_view_t str, wmemory_buf_t &target);
 #endif
 
 // Return directory name from given path or empty string

include/spdlog/details/registry.h

@@ -99,7 +99,7 @@ private:
     std::unique_ptr<formatter> formatter_;
     spdlog::level::level_enum global_log_level_ = level::info;
     level::level_enum flush_level_ = level::off;
-    void (*err_handler_)(const std::string &msg);
+    void (*err_handler_)(const std::string &msg) = nullptr;
     std::shared_ptr<thread_pool> tp_;
     std::unique_ptr<periodic_worker> periodic_flusher_;
     std::shared_ptr<logger> default_logger_;

include/spdlog/details/thread_pool-inl.h

@@ -68,6 +68,11 @@ size_t SPDLOG_INLINE thread_pool::overrun_counter()
     return q_.overrun_counter();
 }
 
+size_t SPDLOG_INLINE thread_pool::queue_size()
+{
+    return q_.size();
+}
+
 void SPDLOG_INLINE thread_pool::post_async_msg_(async_msg &&new_msg, async_overflow_policy overflow_policy)
 {
     if (overflow_policy == async_overflow_policy::block)

include/spdlog/details/thread_pool.h

@@ -97,6 +97,7 @@ public:
     void post_log(async_logger_ptr &&worker_ptr, const details::log_msg &msg, async_overflow_policy overflow_policy);
     void post_flush(async_logger_ptr &&worker_ptr, async_overflow_policy overflow_policy);
     size_t overrun_counter();
+    size_t queue_size();
 
 private:
     q_type q_;

include/spdlog/fmt/bundled/chrono.h

@@ -72,43 +72,27 @@ FMT_CONSTEXPR To lossless_integral_conversion(const From from, int& ec) {
   static_assert(F::is_integer, "From must be integral");
   static_assert(T::is_integer, "To must be integral");
 
-  if (F::is_signed && !T::is_signed) {
+  if (detail::const_check(F::is_signed && !T::is_signed)) {
     // From may be negative, not allowed!
     if (fmt::detail::is_negative(from)) {
       ec = 1;
       return {};
     }
-
     // From is positive. Can it always fit in To?
-    if (F::digits <= T::digits) {
+    if (F::digits > T::digits &&
-      // yes, From always fits in To.
+        from > static_cast<From>(detail::max_value<To>())) {
-    } else {
+      ec = 1;
-      // from may not fit in To, we have to do a dynamic check
+      return {};
-      if (from > static_cast<From>((T::max)())) {
-        ec = 1;
-        return {};
-      }
     }
   }
 
-  if (!F::is_signed && T::is_signed) {
+  if (!F::is_signed && T::is_signed && F::digits >= T::digits &&
-    // can from be held in To?
+      from > static_cast<From>(detail::max_value<To>())) {
-    if (F::digits < T::digits) {
+    ec = 1;
-      // yes, From always fits in To.
+    return {};
-    } else {
-      // from may not fit in To, we have to do a dynamic check
-      if (from > static_cast<From>((T::max)())) {
-        // outside range.
-        ec = 1;
-        return {};
-      }
-    }
   }
-
+  return static_cast<To>(from);  // Lossless conversion.
-  // reaching here means all is ok for lossless conversion.
+}
-  return static_cast<To>(from);
-
-}  // function
 
 template <typename To, typename From,
           FMT_ENABLE_IF(std::is_same<From, To>::value)>
@@ -190,11 +174,9 @@ To safe_duration_cast(std::chrono::duration<FromRep, FromPeriod> from,
   // safe conversion to IntermediateRep
   IntermediateRep count =
       lossless_integral_conversion<IntermediateRep>(from.count(), ec);
-  if (ec) {
+  if (ec) return {};
-    return {};
-  }
   // multiply with Factor::num without overflow or underflow
-  if (Factor::num != 1) {
+  if (detail::const_check(Factor::num != 1)) {
     const auto max1 = detail::max_value<IntermediateRep>() / Factor::num;
     if (count > max1) {
       ec = 1;
@@ -209,17 +191,9 @@ To safe_duration_cast(std::chrono::duration<FromRep, FromPeriod> from,
     count *= Factor::num;
   }
 
-  // this can't go wrong, right? den>0 is checked earlier.
+  if (detail::const_check(Factor::den != 1)) count /= Factor::den;
-  if (Factor::den != 1) {
+  auto tocount = lossless_integral_conversion<typename To::rep>(count, ec);
-    count /= Factor::den;
+  return ec ? To() : To(tocount);
-  }
-  // convert to the to type, safely
-  using ToRep = typename To::rep;
-  const ToRep tocount = lossless_integral_conversion<ToRep>(count, ec);
-  if (ec) {
-    return {};
-  }
-  return To{tocount};
 }
 
 /**
@@ -351,6 +325,11 @@ inline std::tm localtime(std::time_t time) {
   return lt.tm_;
 }
 
+inline std::tm localtime(
+    std::chrono::time_point<std::chrono::system_clock> time_point) {
+  return localtime(std::chrono::system_clock::to_time_t(time_point));
+}
+
 // Thread-safe replacement for std::gmtime
 inline std::tm gmtime(std::time_t time) {
   struct dispatcher {
@@ -387,6 +366,11 @@ inline std::tm gmtime(std::time_t time) {
   return gt.tm_;
 }
 
+inline std::tm gmtime(
+    std::chrono::time_point<std::chrono::system_clock> time_point) {
+  return gmtime(std::chrono::system_clock::to_time_t(time_point));
+}
+
 namespace detail {
 inline size_t strftime(char* str, size_t count, const char* format,
                        const std::tm* time) {
@@ -399,6 +383,17 @@ inline size_t strftime(wchar_t* str, size_t count, const wchar_t* format,
 }
 }  // namespace detail
 
+template <typename Char>
+struct formatter<std::chrono::time_point<std::chrono::system_clock>, Char>
+    : formatter<std::tm, Char> {
+  template <typename FormatContext>
+  auto format(std::chrono::time_point<std::chrono::system_clock> val,
+              FormatContext& ctx) -> decltype(ctx.out()) {
+    std::tm time = localtime(val);
+    return formatter<std::tm, Char>::format(time, ctx);
+  }
+};
+
 template <typename Char> struct formatter<std::tm, Char> {
   template <typename ParseContext>
   auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {

include/spdlog/fmt/bundled/color.h

@@ -463,16 +463,16 @@ template <> inline void reset_color<wchar_t>(FILE* stream) FMT_NOEXCEPT {
 }
 
 template <typename Char>
-inline void reset_color(basic_memory_buffer<Char>& buffer) FMT_NOEXCEPT {
+inline void reset_color(buffer<Char>& buffer) FMT_NOEXCEPT {
   const char* begin = data::reset_color;
   const char* end = begin + sizeof(data::reset_color) - 1;
   buffer.append(begin, end);
 }
 
 template <typename Char>
-void vformat_to(basic_memory_buffer<Char>& buf, const text_style& ts,
+void vformat_to(buffer<Char>& buf, const text_style& ts,
                 basic_string_view<Char> format_str,
-                basic_format_args<buffer_context<Char>> args) {
+                basic_format_args<buffer_context<type_identity_t<Char>>> args) {
   bool has_style = false;
   if (ts.has_emphasis()) {
     has_style = true;
@@ -496,7 +496,7 @@ void vformat_to(basic_memory_buffer<Char>& buf, const text_style& ts,
 
 template <typename S, typename Char = char_t<S>>
 void vprint(std::FILE* f, const text_style& ts, const S& format,
-            basic_format_args<buffer_context<Char>> args) {
+            basic_format_args<buffer_context<type_identity_t<Char>>> args) {
   basic_memory_buffer<Char> buf;
   detail::vformat_to(buf, ts, to_string_view(format), args);
   buf.push_back(Char(0));
@@ -504,20 +504,22 @@ void vprint(std::FILE* f, const text_style& ts, const S& format,
 }
 
 /**
+  \rst
   Formats a string and prints it to the specified file stream using ANSI
   escape sequences to specify text formatting.
-  Example:
+
+  **Example**::
+
     fmt::print(fmt::emphasis::bold | fg(fmt::color::red),
                "Elapsed time: {0:.2f} seconds", 1.23);
+  \endrst
  */
 template <typename S, typename... Args,
           FMT_ENABLE_IF(detail::is_string<S>::value)>
 void print(std::FILE* f, const text_style& ts, const S& format_str,
            const Args&... args) {
-  detail::check_format_string<Args...>(format_str);
+  vprint(f, ts, format_str,
-  using context = buffer_context<char_t<S>>;
+         fmt::make_args_checked<Args...>(format_str, args...));
-  format_arg_store<context, Args...> as{args...};
-  vprint(f, ts, format_str, basic_format_args<context>(as));
 }
 
 /**
@@ -558,7 +560,42 @@ template <typename S, typename... Args, typename Char = char_t<S>>
 inline std::basic_string<Char> format(const text_style& ts, const S& format_str,
                                       const Args&... args) {
   return vformat(ts, to_string_view(format_str),
-                 detail::make_args_checked<Args...>(format_str, args...));
+                 fmt::make_args_checked<Args...>(format_str, args...));
+}
+
+/**
+  Formats a string with the given text_style and writes the output to ``out``.
+ */
+template <typename OutputIt, typename Char,
+          FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value)>
+OutputIt vformat_to(
+    OutputIt out, const text_style& ts, basic_string_view<Char> format_str,
+    basic_format_args<buffer_context<type_identity_t<Char>>> args) {
+  decltype(detail::get_buffer<Char>(out)) buf(detail::get_buffer_init(out));
+  detail::vformat_to(buf, ts, format_str, args);
+  return detail::get_iterator(buf);
+}
+
+/**
+  \rst
+  Formats arguments with the given text_style, writes the result to the output
+  iterator ``out`` and returns the iterator past the end of the output range.
+
+  **Example**::
+
+    std::vector<char> out;
+    fmt::format_to(std::back_inserter(out),
+                   fmt::emphasis::bold | fg(fmt::color::red), "{}", 42);
+  \endrst
+*/
+template <typename OutputIt, typename S, typename... Args,
+          bool enable = detail::is_output_iterator<OutputIt, char_t<S>>::value&&
+              detail::is_string<S>::value>
+inline auto format_to(OutputIt out, const text_style& ts, const S& format_str,
+                      Args&&... args) ->
+    typename std::enable_if<enable, OutputIt>::type {
+  return vformat_to(out, ts, to_string_view(format_str),
+                    fmt::make_args_checked<Args...>(format_str, args...));
 }
 
 FMT_END_NAMESPACE

include/spdlog/fmt/bundled/compile.h

@@ -368,7 +368,8 @@ template <typename... Args> struct type_list {};
 
 // Returns a reference to the argument at index N from [first, rest...].
 template <int N, typename T, typename... Args>
-constexpr const auto& get(const T& first, const Args&... rest) {
+constexpr const auto& get([[maybe_unused]] const T& first,
+                          [[maybe_unused]] const Args&... rest) {
   static_assert(N < 1 + sizeof...(Args), "index is out of bounds");
   if constexpr (N == 0)
     return first;
@@ -406,6 +407,19 @@ constexpr text<Char> make_text(basic_string_view<Char> s, size_t pos,
   return {{&s[pos], size}};
 }
 
+template <typename Char> struct code_unit {
+  Char value;
+  using char_type = Char;
+
+  template <typename OutputIt, typename... Args>
+  OutputIt format(OutputIt out, const Args&...) const {
+    return write<Char>(out, value);
+  }
+};
+
+template <typename Char>
+struct is_compiled_format<code_unit<Char>> : std::true_type {};
+
 // A replacement field that refers to argument N.
 template <typename Char, typename T, int N> struct field {
   using char_type = Char;
@@ -430,7 +444,9 @@ template <typename Char, typename T, int N> struct spec_field {
   OutputIt format(OutputIt out, const Args&... args) const {
     // This ensures that the argument type is convertile to `const T&`.
     const T& arg = get<N>(args...);
-    basic_format_context<OutputIt, Char> ctx(out, {});
+    const auto& vargs =
+        make_format_args<basic_format_context<OutputIt, Char>>(args...);
+    basic_format_context<OutputIt, Char> ctx(out, vargs);
     return fmt.format(arg, ctx);
   }
 };
@@ -489,16 +505,17 @@ constexpr auto parse_tail(T head, S format_str) {
 template <typename T, typename Char> struct parse_specs_result {
   formatter<T, Char> fmt;
   size_t end;
+  int next_arg_id;
 };
 
 template <typename T, typename Char>
 constexpr parse_specs_result<T, Char> parse_specs(basic_string_view<Char> str,
-                                                  size_t pos) {
+                                                  size_t pos, int arg_id) {
   str.remove_prefix(pos);
-  auto ctx = basic_format_parse_context<Char>(str);
+  auto ctx = basic_format_parse_context<Char>(str, {}, arg_id + 1);
   auto f = formatter<T, Char>();
   auto end = f.parse(ctx);
-  return {f, pos + (end - str.data()) + 1};
+  return {f, pos + (end - str.data()) + 1, ctx.next_arg_id()};
 }
 
 // Compiles a non-empty format string and returns the compiled representation
@@ -518,8 +535,8 @@ constexpr auto compile_format_string(S format_str) {
                                                format_str);
     } else if constexpr (str[POS + 1] == ':') {
       using type = get_type<ID, Args>;
-      constexpr auto result = parse_specs<type>(str, POS + 2);
+      constexpr auto result = parse_specs<type>(str, POS + 2, ID);
-      return parse_tail<Args, result.end, ID + 1>(
+      return parse_tail<Args, result.end, result.next_arg_id>(
           spec_field<char_type, type, ID>{result.fmt}, format_str);
     } else {
       return unknown_format();
@@ -530,8 +547,13 @@ constexpr auto compile_format_string(S format_str) {
     return parse_tail<Args, POS + 2, ID>(make_text(str, POS, 1), format_str);
   } else {
     constexpr auto end = parse_text(str, POS + 1);
-    return parse_tail<Args, end, ID>(make_text(str, POS, end - POS),
+    if constexpr (end - POS > 1) {
-                                     format_str);
+      return parse_tail<Args, end, ID>(make_text(str, POS, end - POS),
+                                       format_str);
+    } else {
+      return parse_tail<Args, end, ID>(code_unit<char_type>{str[POS]},
+                                       format_str);
+    }
   }
 }
 
@@ -587,8 +609,7 @@ template <typename CompiledFormat, typename... Args,
 FMT_INLINE std::basic_string<Char> format(const CompiledFormat& cf,
                                           const Args&... args) {
   basic_memory_buffer<Char> buffer;
-  detail::buffer<Char>& base = buffer;
+  cf.format(detail::buffer_appender<Char>(buffer), args...);
-  cf.format(std::back_inserter(base), args...);
   return to_string(buffer);
 }
 
@@ -608,8 +629,7 @@ template <typename CompiledFormat, typename... Args,
 std::basic_string<Char> format(const CompiledFormat& cf, const Args&... args) {
   basic_memory_buffer<Char> buffer;
   using context = buffer_context<Char>;
-  detail::buffer<Char>& base = buffer;
+  detail::cf::vformat_to<context>(detail::buffer_appender<Char>(buffer), cf,
-  detail::cf::vformat_to<context>(std::back_inserter(base), cf,
                                   make_format_args<context>(args...));
   return to_string(buffer);
 }
@@ -618,9 +638,13 @@ template <typename S, typename... Args,
           FMT_ENABLE_IF(detail::is_compiled_string<S>::value)>
 FMT_INLINE std::basic_string<typename S::char_type> format(const S&,
                                                            Args&&... args) {
-  constexpr basic_string_view<typename S::char_type> str = S();
+#ifdef __cpp_if_constexpr
-  if (str.size() == 2 && str[0] == '{' && str[1] == '}')
+  if constexpr (std::is_same<typename S::char_type, char>::value) {
-    return fmt::to_string(detail::first(args...));
+    constexpr basic_string_view<typename S::char_type> str = S();
+    if (str.size() == 2 && str[0] == '{' && str[1] == '}')
+      return fmt::to_string(detail::first(args...));
+  }
+#endif
   constexpr auto compiled = detail::compile<Args...>(S());
   return format(compiled, std::forward<Args>(args)...);
 }
@@ -643,18 +667,30 @@ OutputIt format_to(OutputIt out, const S&, const Args&... args) {
   return format_to(out, compiled, args...);
 }
 
-template <
+template <typename OutputIt, typename CompiledFormat, typename... Args>
-    typename OutputIt, typename CompiledFormat, typename... Args,
+auto format_to_n(OutputIt out, size_t n, const CompiledFormat& cf,
-    FMT_ENABLE_IF(detail::is_output_iterator<OutputIt>::value&& std::is_base_of<
+                 const Args&... args) ->
-                  detail::basic_compiled_format, CompiledFormat>::value)>
+    typename std::enable_if<
-format_to_n_result<OutputIt> format_to_n(OutputIt out, size_t n,
+        detail::is_output_iterator<OutputIt,
-                                         const CompiledFormat& cf,
+                                   typename CompiledFormat::char_type>::value &&
-                                         const Args&... args) {
+            std::is_base_of<detail::basic_compiled_format,
+                            CompiledFormat>::value,
+        format_to_n_result<OutputIt>>::type {
   auto it =
       format_to(detail::truncating_iterator<OutputIt>(out, n), cf, args...);
   return {it.base(), it.count()};
 }
 
+template <typename OutputIt, typename S, typename... Args,
+          FMT_ENABLE_IF(detail::is_compiled_string<S>::value)>
+format_to_n_result<OutputIt> format_to_n(OutputIt out, size_t n, const S&,
+                                         const Args&... args) {
+  constexpr auto compiled = detail::compile<Args...>(S());
+  auto it = format_to(detail::truncating_iterator<OutputIt>(out, n), compiled,
+                      args...);
+  return {it.base(), it.count()};
+}
+
 template <typename CompiledFormat, typename... Args>
 size_t formatted_size(const CompiledFormat& cf, const Args&... args) {
   return format_to(detail::counting_iterator(), cf, args...).count();

include/spdlog/fmt/bundled/core.h

@@ -18,7 +18,7 @@
 #include <vector>
 
 // The fmt library version in the form major * 10000 + minor * 100 + patch.
-#define FMT_VERSION 70003
+#define FMT_VERSION 70103
 
 #ifdef __clang__
 #  define FMT_CLANG_VERSION (__clang_major__ * 100 + __clang_minor__)
@@ -57,6 +57,7 @@
 #  define FMT_MSC_VER 0
 #  define FMT_SUPPRESS_MSC_WARNING(n)
 #endif
+
 #ifdef __has_feature
 #  define FMT_HAS_FEATURE(x) __has_feature(x)
 #else
@@ -64,7 +65,7 @@
 #endif
 
 #if defined(__has_include) && !defined(__INTELLISENSE__) && \
-    !(FMT_ICC_VERSION && FMT_ICC_VERSION < 1600)
+    (!FMT_ICC_VERSION || FMT_ICC_VERSION >= 1600)
 #  define FMT_HAS_INCLUDE(x) __has_include(x)
 #else
 #  define FMT_HAS_INCLUDE(x) 0
@@ -99,7 +100,7 @@
 #endif
 
 #ifndef FMT_OVERRIDE
-#  if FMT_HAS_FEATURE(cxx_override) || \
+#  if FMT_HAS_FEATURE(cxx_override_control) || \
       (FMT_GCC_VERSION >= 408 && FMT_HAS_GXX_CXX11) || FMT_MSC_VER >= 1900
 #    define FMT_OVERRIDE override
 #  else
@@ -152,7 +153,7 @@
 #  if FMT_HAS_CPP14_ATTRIBUTE(deprecated) || FMT_MSC_VER >= 1900
 #    define FMT_DEPRECATED [[deprecated]]
 #  else
-#    if defined(__GNUC__) || defined(__clang__)
+#    if (defined(__GNUC__) && !defined(__LCC__)) || defined(__clang__)
 #      define FMT_DEPRECATED __attribute__((deprecated))
 #    elif FMT_MSC_VER
 #      define FMT_DEPRECATED __declspec(deprecated)
@@ -177,9 +178,17 @@
 #  endif
 #endif
 
-#ifndef FMT_BEGIN_NAMESPACE
+#ifndef FMT_USE_INLINE_NAMESPACES
 #  if FMT_HAS_FEATURE(cxx_inline_namespaces) || FMT_GCC_VERSION >= 404 || \
-      FMT_MSC_VER >= 1900
+      (FMT_MSC_VER >= 1900 && !_MANAGED)
+#    define FMT_USE_INLINE_NAMESPACES 1
+#  else
+#    define FMT_USE_INLINE_NAMESPACES 0
+#  endif
+#endif
+
+#ifndef FMT_BEGIN_NAMESPACE
+#  if FMT_USE_INLINE_NAMESPACES
 #    define FMT_INLINE_NAMESPACE inline namespace
 #    define FMT_END_NAMESPACE \
       }                       \
@@ -269,8 +278,7 @@ struct monostate {};
 
 namespace detail {
 
-// A helper function to suppress bogus "conditional expression is constant"
+// A helper function to suppress "conditional expression is constant" warnings.
-// warnings.
 template <typename T> constexpr T const_check(T value) { return value; }
 
 FMT_NORETURN FMT_API void assert_fail(const char* file, int line,
@@ -299,7 +307,8 @@ template <typename T> struct std_string_view {};
 
 #ifdef FMT_USE_INT128
 // Do nothing.
-#elif defined(__SIZEOF_INT128__) && !FMT_NVCC && !(FMT_CLANG_VERSION && FMT_MSC_VER)
+#elif defined(__SIZEOF_INT128__) && !FMT_NVCC && \
+    !(FMT_CLANG_VERSION && FMT_MSC_VER)
 #  define FMT_USE_INT128 1
 using int128_t = __int128_t;
 using uint128_t = __uint128_t;
@@ -506,6 +515,18 @@ template <typename S> struct char_t_impl<S, enable_if_t<is_string<S>::value>> {
   using type = typename result::value_type;
 };
 
+// Reports a compile-time error if S is not a valid format string.
+template <typename..., typename S, FMT_ENABLE_IF(!is_compile_string<S>::value)>
+FMT_INLINE void check_format_string(const S&) {
+#ifdef FMT_ENFORCE_COMPILE_STRING
+  static_assert(is_compile_string<S>::value,
+                "FMT_ENFORCE_COMPILE_STRING requires all format strings to use "
+                "FMT_STRING.");
+#endif
+}
+template <typename..., typename S, FMT_ENABLE_IF(is_compile_string<S>::value)>
+void check_format_string(S);
+
 struct error_handler {
   constexpr error_handler() = default;
   constexpr error_handler(const error_handler&) = default;
@@ -545,8 +566,9 @@ class basic_format_parse_context : private ErrorHandler {
   using iterator = typename basic_string_view<Char>::iterator;
 
   explicit constexpr basic_format_parse_context(
-      basic_string_view<Char> format_str, ErrorHandler eh = {})
+      basic_string_view<Char> format_str, ErrorHandler eh = {},
-      : ErrorHandler(eh), format_str_(format_str), next_arg_id_(0) {}
+      int next_arg_id = 0)
+      : ErrorHandler(eh), format_str_(format_str), next_arg_id_(next_arg_id) {}
 
   /**
     Returns an iterator to the beginning of the format string range being
@@ -616,8 +638,24 @@ template <typename T, typename Context>
 using has_formatter =
     std::is_constructible<typename Context::template formatter_type<T>>;
 
+// Checks whether T is a container with contiguous storage.
+template <typename T> struct is_contiguous : std::false_type {};
+template <typename Char>
+struct is_contiguous<std::basic_string<Char>> : std::true_type {};
+
 namespace detail {
 
+// Extracts a reference to the container from back_insert_iterator.
+template <typename Container>
+inline Container& get_container(std::back_insert_iterator<Container> it) {
+  using bi_iterator = std::back_insert_iterator<Container>;
+  struct accessor : bi_iterator {
+    accessor(bi_iterator iter) : bi_iterator(iter) {}
+    using bi_iterator::container;
+  };
+  return *accessor(it).container;
+}
+
 /**
   \rst
   A contiguous memory buffer with an optional growing ability. It is an internal
@@ -640,6 +678,8 @@ template <typename T> class buffer {
         size_(sz),
         capacity_(cap) {}
 
+  ~buffer() = default;
+
   /** Sets the buffer data and capacity. */
   void set(T* buf_data, size_t buf_capacity) FMT_NOEXCEPT {
     ptr_ = buf_data;
@@ -655,7 +695,6 @@ template <typename T> class buffer {
 
   buffer(const buffer&) = delete;
   void operator=(const buffer&) = delete;
-  virtual ~buffer() = default;
 
   T* begin() FMT_NOEXCEPT { return ptr_; }
   T* end() FMT_NOEXCEPT { return ptr_ + size_; }
@@ -675,24 +714,26 @@ template <typename T> class buffer {
   /** Returns a pointer to the buffer data. */
   const T* data() const FMT_NOEXCEPT { return ptr_; }
 
-  /**
-    Resizes the buffer. If T is a POD type new elements may not be initialized.
-   */
-  void resize(size_t new_size) {
-    reserve(new_size);
-    size_ = new_size;
-  }
-
   /** Clears this buffer. */
   void clear() { size_ = 0; }
 
-  /** Reserves space to store at least *capacity* elements. */
+  // Tries resizing the buffer to contain *count* elements. If T is a POD type
-  void reserve(size_t new_capacity) {
+  // the new elements may not be initialized.
+  void try_resize(size_t count) {
+    try_reserve(count);
+    size_ = count <= capacity_ ? count : capacity_;
+  }
+
+  // Tries increasing the buffer capacity to *new_capacity*. It can increase the
+  // capacity by a smaller amount than requested but guarantees there is space
+  // for at least one additional element either by increasing the capacity or by
+  // flushing the buffer if it is full.
+  void try_reserve(size_t new_capacity) {
     if (new_capacity > capacity_) grow(new_capacity);
   }
 
   void push_back(const T& value) {
-    reserve(size_ + 1);
+    try_reserve(size_ + 1);
     ptr_[size_++] = value;
   }
 
@@ -705,32 +746,150 @@ template <typename T> class buffer {
   }
 };
 
-// A container-backed buffer.
+struct buffer_traits {
+  explicit buffer_traits(size_t) {}
+  size_t count() const { return 0; }
+  size_t limit(size_t size) { return size; }
+};
+
+class fixed_buffer_traits {
+ private:
+  size_t count_ = 0;
+  size_t limit_;
+
+ public:
+  explicit fixed_buffer_traits(size_t limit) : limit_(limit) {}
+  size_t count() const { return count_; }
+  size_t limit(size_t size) {
+    size_t n = limit_ > count_ ? limit_ - count_ : 0;
+    count_ += size;
+    return size < n ? size : n;
+  }
+};
+
+// A buffer that writes to an output iterator when flushed.
+template <typename OutputIt, typename T, typename Traits = buffer_traits>
+class iterator_buffer final : public Traits, public buffer<T> {
+ private:
+  OutputIt out_;
+  enum { buffer_size = 256 };
+  T data_[buffer_size];
+
+ protected:
+  void grow(size_t) final FMT_OVERRIDE {
+    if (this->size() == buffer_size) flush();
+  }
+  void flush();
+
+ public:
+  explicit iterator_buffer(OutputIt out, size_t n = buffer_size)
+      : Traits(n),
+        buffer<T>(data_, 0, buffer_size),
+        out_(out) {}
+  ~iterator_buffer() { flush(); }
+
+  OutputIt out() {
+    flush();
+    return out_;
+  }
+  size_t count() const { return Traits::count() + this->size(); }
+};
+
+template <typename T> class iterator_buffer<T*, T> final : public buffer<T> {
+ protected:
+  void grow(size_t) final FMT_OVERRIDE {}
+
+ public:
+  explicit iterator_buffer(T* out, size_t = 0) : buffer<T>(out, 0, ~size_t()) {}
+
+  T* out() { return &*this->end(); }
+};
+
+// A buffer that writes to a container with the contiguous storage.
 template <typename Container>
-class container_buffer : public buffer<typename Container::value_type> {
+class iterator_buffer<std::back_insert_iterator<Container>,
+                      enable_if_t<is_contiguous<Container>::value,
+                                  typename Container::value_type>>
+    final : public buffer<typename Container::value_type> {
  private:
   Container& container_;
 
  protected:
-  void grow(size_t capacity) FMT_OVERRIDE {
+  void grow(size_t capacity) final FMT_OVERRIDE {
     container_.resize(capacity);
     this->set(&container_[0], capacity);
   }
 
  public:
-  explicit container_buffer(Container& c)
+  explicit iterator_buffer(Container& c)
       : buffer<typename Container::value_type>(c.size()), container_(c) {}
+  explicit iterator_buffer(std::back_insert_iterator<Container> out, size_t = 0)
+      : iterator_buffer(get_container(out)) {}
+  std::back_insert_iterator<Container> out() {
+    return std::back_inserter(container_);
+  }
 };
 
-// Extracts a reference to the container from back_insert_iterator.
+// A buffer that counts the number of code units written discarding the output.
-template <typename Container>
+template <typename T = char> class counting_buffer final : public buffer<T> {
-inline Container& get_container(std::back_insert_iterator<Container> it) {
+ private:
-  using bi_iterator = std::back_insert_iterator<Container>;
+  enum { buffer_size = 256 };
-  struct accessor : bi_iterator {
+  T data_[buffer_size];
-    accessor(bi_iterator iter) : bi_iterator(iter) {}
+  size_t count_ = 0;
-    using bi_iterator::container;
+
-  };
+ protected:
-  return *accessor(it).container;
+  void grow(size_t) final FMT_OVERRIDE {
+    if (this->size() != buffer_size) return;
+    count_ += this->size();
+    this->clear();
+  }
+
+ public:
+  counting_buffer() : buffer<T>(data_, 0, buffer_size) {}
+
+  size_t count() { return count_ + this->size(); }
+};
+
+// An output iterator that appends to the buffer.
+// It is used to reduce symbol sizes for the common case.
+template <typename T>
+class buffer_appender : public std::back_insert_iterator<buffer<T>> {
+  using base = std::back_insert_iterator<buffer<T>>;
+
+ public:
+  explicit buffer_appender(buffer<T>& buf) : base(buf) {}
+  buffer_appender(base it) : base(it) {}
+
+  buffer_appender& operator++() {
+    base::operator++();
+    return *this;
+  }
+
+  buffer_appender operator++(int) {
+    buffer_appender tmp = *this;
+    ++*this;
+    return tmp;
+  }
+};
+
+// Maps an output iterator into a buffer.
+template <typename T, typename OutputIt>
+iterator_buffer<OutputIt, T> get_buffer(OutputIt);
+template <typename T> buffer<T>& get_buffer(buffer_appender<T>);
+
+template <typename OutputIt> OutputIt get_buffer_init(OutputIt out) {
+  return out;
+}
+template <typename T> buffer<T>& get_buffer_init(buffer_appender<T> out) {
+  return get_container(out);
+}
+
+template <typename Buffer>
+auto get_iterator(Buffer& buf) -> decltype(buf.out()) {
+  return buf.out();
+}
+template <typename T> buffer_appender<T> get_iterator(buffer<T>& buf) {
+  return buffer_appender<T>(buf);
 }
 
 template <typename T, typename Char = char, typename Enable = void>
@@ -759,7 +918,8 @@ template <typename Char> struct named_arg_info {
 template <typename T, typename Char, size_t NUM_ARGS, size_t NUM_NAMED_ARGS>
 struct arg_data {
   // args_[0].named_args points to named_args_ to avoid bloating format_args.
-  T args_[1 + (NUM_ARGS != 0 ? NUM_ARGS : 1)];
+  // +1 to workaround a bug in gcc 7.5 that causes duplicated-branches warning.
+  T args_[1 + (NUM_ARGS != 0 ? NUM_ARGS : +1)];
   named_arg_info<Char> named_args_[NUM_NAMED_ARGS];
 
   template <typename... U>
@@ -771,7 +931,8 @@ struct arg_data {
 
 template <typename T, typename Char, size_t NUM_ARGS>
 struct arg_data<T, Char, NUM_ARGS, 0> {
-  T args_[NUM_ARGS != 0 ? NUM_ARGS : 1];
+  // +1 to workaround a bug in gcc 7.5 that causes duplicated-branches warning.
+  T args_[NUM_ARGS != 0 ? NUM_ARGS : +1];
 
   template <typename... U>
   FMT_INLINE arg_data(const U&... init) : args_{init...} {}
@@ -959,6 +1120,8 @@ enum { long_short = sizeof(long) == sizeof(int) };
 using long_type = conditional_t<long_short, int, long long>;
 using ulong_type = conditional_t<long_short, unsigned, unsigned long long>;
 
+struct unformattable {};
+
 // Maps formatting arguments to core types.
 template <typename Context> struct arg_mapper {
   using char_type = typename Context::char_type;
@@ -1067,15 +1230,7 @@ template <typename Context> struct arg_mapper {
     return map(val.value);
   }
 
-  int map(...) {
+  unformattable map(...) { return {}; }
-    constexpr bool formattable = sizeof(Context) == 0;
-    static_assert(
-        formattable,
-        "Cannot format argument. To make type T formattable provide a "
-        "formatter<T> specialization: "
-        "https://fmt.dev/latest/api.html#formatting-user-defined-types");
-    return 0;
-  }
 };
 
 // A type constant after applying arg_mapper<Context>.
@@ -1199,15 +1354,25 @@ FMT_CONSTEXPR_DECL FMT_INLINE auto visit_format_arg(
   return vis(monostate());
 }
 
-// Checks whether T is a container with contiguous storage.
+template <typename T> struct formattable : std::false_type {};
-template <typename T> struct is_contiguous : std::false_type {};
-template <typename Char>
-struct is_contiguous<std::basic_string<Char>> : std::true_type {};
-template <typename Char>
-struct is_contiguous<detail::buffer<Char>> : std::true_type {};
 
 namespace detail {
 
+// A workaround for gcc 4.8 to make void_t work in a SFINAE context.
+template <typename... Ts> struct void_t_impl { using type = void; };
+template <typename... Ts>
+using void_t = typename detail::void_t_impl<Ts...>::type;
+
+template <typename It, typename T, typename Enable = void>
+struct is_output_iterator : std::false_type {};
+
+template <typename It, typename T>
+struct is_output_iterator<
+    It, T,
+    void_t<typename std::iterator_traits<It>::iterator_category,
+           decltype(*std::declval<It>() = std::declval<T>())>>
+    : std::true_type {};
+
 template <typename OutputIt>
 struct is_back_insert_iterator : std::false_type {};
 template <typename Container>
@@ -1219,6 +1384,9 @@ struct is_contiguous_back_insert_iterator : std::false_type {};
 template <typename Container>
 struct is_contiguous_back_insert_iterator<std::back_insert_iterator<Container>>
     : is_contiguous<Container> {};
+template <typename Char>
+struct is_contiguous_back_insert_iterator<buffer_appender<Char>>
+    : std::true_type {};
 
 // A type-erased reference to an std::locale to avoid heavy <locale> include.
 class locale_ref {
@@ -1250,13 +1418,24 @@ FMT_CONSTEXPR basic_format_arg<Context> make_arg(const T& value) {
   return arg;
 }
 
+template <typename T> int check(unformattable) {
+  static_assert(
+      formattable<T>(),
+      "Cannot format an argument. To make type T formattable provide a "
+      "formatter<T> specialization: https://fmt.dev/latest/api.html#udt");
+  return 0;
+}
+template <typename T, typename U> inline const U& check(const U& val) {
+  return val;
+}
+
 // The type template parameter is there to avoid an ODR violation when using
 // a fallback formatter in one translation unit and an implicit conversion in
 // another (not recommended).
 template <bool IS_PACKED, typename Context, type, typename T,
           FMT_ENABLE_IF(IS_PACKED)>
 inline value<Context> make_arg(const T& val) {
-  return arg_mapper<Context>().map(val);
+  return check<T>(arg_mapper<Context>().map(val));
 }
 
 template <bool IS_PACKED, typename Context, type, typename T,
@@ -1356,13 +1535,13 @@ template <typename OutputIt, typename Char> class basic_format_context {
 
 template <typename Char>
 using buffer_context =
-    basic_format_context<std::back_insert_iterator<detail::buffer<Char>>, Char>;
+    basic_format_context<detail::buffer_appender<Char>, Char>;
 using format_context = buffer_context<char>;
 using wformat_context = buffer_context<wchar_t>;
 
-// Workaround a bug in gcc: https://stackoverflow.com/q/62767544/471164.
+// Workaround an alias issue: https://stackoverflow.com/q/62767544/471164.
 #define FMT_BUFFER_CONTEXT(Char) \
-  basic_format_context<std::back_insert_iterator<detail::buffer<Char>>, Char>
+  basic_format_context<detail::buffer_appender<Char>, Char>
 
 /**
   \rst
@@ -1414,7 +1593,7 @@ class format_arg_store
 
 /**
   \rst
-  Constructs an `~fmt::format_arg_store` object that contains references to
+  Constructs a `~fmt::format_arg_store` object that contains references to
   arguments and can be implicitly converted to `~fmt::format_args`. `Context`
   can be omitted in which case it defaults to `~fmt::context`.
   See `~fmt::arg` for lifetime considerations.
@@ -1426,6 +1605,27 @@ inline format_arg_store<Context, Args...> make_format_args(
   return {args...};
 }
 
+/**
+  \rst
+  Constructs a `~fmt::format_arg_store` object that contains references
+  to arguments and can be implicitly converted to `~fmt::format_args`.
+  If ``format_str`` is a compile-time string then `make_args_checked` checks
+  its validity at compile time.
+  \endrst
+ */
+template <typename... Args, typename S, typename Char = char_t<S>>
+inline auto make_args_checked(const S& format_str,
+                              const remove_reference_t<Args>&... args)
+    -> format_arg_store<buffer_context<Char>, remove_reference_t<Args>...> {
+  static_assert(
+      detail::count<(
+              std::is_base_of<detail::view, remove_reference_t<Args>>::value &&
+              std::is_reference<Args>::value)...>() == 0,
+      "passing views as lvalues is disallowed");
+  detail::check_format_string<Args...>(format_str);
+  return {args...};
+}
+
 /**
   \rst
   Returns a named argument to be used in a formatting function. It should only
@@ -1729,7 +1929,14 @@ template <typename Context> class basic_format_args {
   }
 };
 
-/** An alias to ``basic_format_args<context>``. */
+#ifdef FMT_ARM_ABI_COMPATIBILITY
+/** An alias to ``basic_format_args<format_context>``. */
+// Separate types would result in shorter symbols but break ABI compatibility
+// between clang and gcc on ARM (#1919).
+using format_args = basic_format_args<format_context>;
+using wformat_args = basic_format_args<wformat_context>;
+#else
+// DEPRECATED! These are kept for ABI compatibility.
 // It is a separate type rather than an alias to make symbols readable.
 struct format_args : basic_format_args<format_context> {
   template <typename... Args>
@@ -1738,32 +1945,10 @@ struct format_args : basic_format_args<format_context> {
 struct wformat_args : basic_format_args<wformat_context> {
   using basic_format_args::basic_format_args;
 };
+#endif
 
 namespace detail {
 
-// Reports a compile-time error if S is not a valid format string.
-template <typename..., typename S, FMT_ENABLE_IF(!is_compile_string<S>::value)>
-FMT_INLINE void check_format_string(const S&) {
-#ifdef FMT_ENFORCE_COMPILE_STRING
-  static_assert(is_compile_string<S>::value,
-                "FMT_ENFORCE_COMPILE_STRING requires all format strings to use "
-                "FMT_STRING.");
-#endif
-}
-template <typename..., typename S, FMT_ENABLE_IF(is_compile_string<S>::value)>
-void check_format_string(S);
-
-template <typename... Args, typename S, typename Char = char_t<S>>
-inline format_arg_store<buffer_context<Char>, remove_reference_t<Args>...>
-make_args_checked(const S& format_str,
-                  const remove_reference_t<Args>&... args) {
-  static_assert(count<(std::is_base_of<view, remove_reference_t<Args>>::value &&
-                       std::is_reference<Args>::value)...>() == 0,
-                "passing views as lvalues is disallowed");
-  check_format_string<Args...>(format_str);
-  return {args...};
-}
-
 template <typename Char, FMT_ENABLE_IF(!std::is_same<Char, char>::value)>
 std::basic_string<Char> vformat(
     basic_string_view<Char> format_str,
@@ -1772,9 +1957,10 @@ std::basic_string<Char> vformat(
 FMT_API std::string vformat(string_view format_str, format_args args);
 
 template <typename Char>
-typename FMT_BUFFER_CONTEXT(Char)::iterator vformat_to(
+void vformat_to(
     buffer<Char>& buf, basic_string_view<Char> format_str,
-    basic_format_args<FMT_BUFFER_CONTEXT(type_identity_t<Char>)> args);
+    basic_format_args<FMT_BUFFER_CONTEXT(type_identity_t<Char>)> args,
+    detail::locale_ref loc = {});
 
 template <typename Char, typename Args,
           FMT_ENABLE_IF(!std::is_same<Char, char>::value)>
@@ -1789,26 +1975,80 @@ inline void vprint_mojibake(std::FILE*, string_view, format_args) {}
 /** Formats a string and writes the output to ``out``. */
 // GCC 8 and earlier cannot handle std::back_insert_iterator<Container> with
 // vformat_to<ArgFormatter>(...) overload, so SFINAE on iterator type instead.
-template <
+template <typename OutputIt, typename S, typename Char = char_t<S>,
-    typename OutputIt, typename S, typename Char = char_t<S>,
+          bool enable = detail::is_output_iterator<OutputIt, Char>::value>
-    FMT_ENABLE_IF(detail::is_contiguous_back_insert_iterator<OutputIt>::value)>
+auto vformat_to(OutputIt out, const S& format_str,
-OutputIt vformat_to(
+                basic_format_args<buffer_context<type_identity_t<Char>>> args)
-    OutputIt out, const S& format_str,
+    -> typename std::enable_if<enable, OutputIt>::type {
-    basic_format_args<buffer_context<type_identity_t<Char>>> args) {
+  decltype(detail::get_buffer<Char>(out)) buf(detail::get_buffer_init(out));
-  auto& c = detail::get_container(out);
-  detail::container_buffer<remove_reference_t<decltype(c)>> buf(c);
   detail::vformat_to(buf, to_string_view(format_str), args);
-  return out;
+  return detail::get_iterator(buf);
 }
 
-template <typename Container, typename S, typename... Args,
+/**
-          FMT_ENABLE_IF(
+ \rst
-              is_contiguous<Container>::value&& detail::is_string<S>::value)>
+ Formats arguments, writes the result to the output iterator ``out`` and returns
-inline std::back_insert_iterator<Container> format_to(
+ the iterator past the end of the output range.
-    std::back_insert_iterator<Container> out, const S& format_str,
+
-    Args&&... args) {
+ **Example**::
-  return vformat_to(out, to_string_view(format_str),
+
-                    detail::make_args_checked<Args...>(format_str, args...));
+   std::vector<char> out;
+   fmt::format_to(std::back_inserter(out), "{}", 42);
+ \endrst
+ */
+// We cannot use FMT_ENABLE_IF because of a bug in gcc 8.3.
+template <typename OutputIt, typename S, typename... Args,
+          bool enable = detail::is_output_iterator<OutputIt, char_t<S>>::value>
+inline auto format_to(OutputIt out, const S& format_str, Args&&... args) ->
+    typename std::enable_if<enable, OutputIt>::type {
+  const auto& vargs = fmt::make_args_checked<Args...>(format_str, args...);
+  return vformat_to(out, to_string_view(format_str), vargs);
+}
+
+template <typename OutputIt> struct format_to_n_result {
+  /** Iterator past the end of the output range. */
+  OutputIt out;
+  /** Total (not truncated) output size. */
+  size_t size;
+};
+
+template <typename OutputIt, typename Char, typename... Args,
+          FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value)>
+inline format_to_n_result<OutputIt> vformat_to_n(
+    OutputIt out, size_t n, basic_string_view<Char> format_str,
+    basic_format_args<buffer_context<type_identity_t<Char>>> args) {
+  detail::iterator_buffer<OutputIt, Char, detail::fixed_buffer_traits> buf(out,
+                                                                           n);
+  detail::vformat_to(buf, format_str, args);
+  return {buf.out(), buf.count()};
+}
+
+/**
+ \rst
+ Formats arguments, writes up to ``n`` characters of the result to the output
+ iterator ``out`` and returns the total output size and the iterator past the
+ end of the output range.
+ \endrst
+ */
+template <typename OutputIt, typename S, typename... Args,
+          bool enable = detail::is_output_iterator<OutputIt, char_t<S>>::value>
+inline auto format_to_n(OutputIt out, size_t n, const S& format_str,
+                        const Args&... args) ->
+    typename std::enable_if<enable, format_to_n_result<OutputIt>>::type {
+  const auto& vargs = fmt::make_args_checked<Args...>(format_str, args...);
+  return vformat_to_n(out, n, to_string_view(format_str), vargs);
+}
+
+/**
+  Returns the number of characters in the output of
+  ``format(format_str, args...)``.
+ */
+template <typename... Args>
+inline size_t formatted_size(string_view format_str, Args&&... args) {
+  const auto& vargs = fmt::make_args_checked<Args...>(format_str, args...);
+  detail::counting_buffer<> buf;
+  detail::vformat_to(buf, format_str, vargs);
+  return buf.count();
 }
 
 template <typename S, typename Char = char_t<S>>
@@ -1832,7 +2072,7 @@ FMT_INLINE std::basic_string<Char> vformat(
 // std::basic_string<char_t<S>> to reduce the symbol size.
 template <typename S, typename... Args, typename Char = char_t<S>>
 FMT_INLINE std::basic_string<Char> format(const S& format_str, Args&&... args) {
-  const auto& vargs = detail::make_args_checked<Args...>(format_str, args...);
+  const auto& vargs = fmt::make_args_checked<Args...>(format_str, args...);
   return detail::vformat(to_string_view(format_str), vargs);
 }
 
@@ -1852,7 +2092,7 @@ FMT_API void vprint(std::FILE*, string_view, format_args);
  */
 template <typename S, typename... Args, typename Char = char_t<S>>
 inline void print(std::FILE* f, const S& format_str, Args&&... args) {
-  const auto& vargs = detail::make_args_checked<Args...>(format_str, args...);
+  const auto& vargs = fmt::make_args_checked<Args...>(format_str, args...);
   return detail::is_unicode<Char>()
              ? vprint(f, to_string_view(format_str), vargs)
              : detail::vprint_mojibake(f, to_string_view(format_str), vargs);
@@ -1871,7 +2111,7 @@ inline void print(std::FILE* f, const S& format_str, Args&&... args) {
  */
 template <typename S, typename... Args, typename Char = char_t<S>>
 inline void print(const S& format_str, Args&&... args) {
-  const auto& vargs = detail::make_args_checked<Args...>(format_str, args...);
+  const auto& vargs = fmt::make_args_checked<Args...>(format_str, args...);
   return detail::is_unicode<Char>()
              ? vprint(to_string_view(format_str), vargs)
              : detail::vprint_mojibake(stdout, to_string_view(format_str),

include/spdlog/fmt/bundled/locale.h

@@ -15,22 +15,12 @@
 FMT_BEGIN_NAMESPACE
 
 namespace detail {
-template <typename Char>
-typename buffer_context<Char>::iterator vformat_to(
-    const std::locale& loc, buffer<Char>& buf,
-    basic_string_view<Char> format_str,
-    basic_format_args<buffer_context<type_identity_t<Char>>> args) {
-  using af = arg_formatter<typename buffer_context<Char>::iterator, Char>;
-  return vformat_to<af>(std::back_inserter(buf), to_string_view(format_str),
-                        args, detail::locale_ref(loc));
-}
-
 template <typename Char>
 std::basic_string<Char> vformat(
     const std::locale& loc, basic_string_view<Char> format_str,
     basic_format_args<buffer_context<type_identity_t<Char>>> args) {
   basic_memory_buffer<Char> buffer;
-  detail::vformat_to(loc, buffer, format_str, args);
+  detail::vformat_to(buffer, format_str, args, detail::locale_ref(loc));
   return fmt::to_string(buffer);
 }
 }  // namespace detail
@@ -45,32 +35,28 @@ inline std::basic_string<Char> vformat(
 template <typename S, typename... Args, typename Char = char_t<S>>
 inline std::basic_string<Char> format(const std::locale& loc,
                                       const S& format_str, Args&&... args) {
-  return detail::vformat(
+  return detail::vformat(loc, to_string_view(format_str),
-      loc, to_string_view(format_str),
+                         fmt::make_args_checked<Args...>(format_str, args...));
-      detail::make_args_checked<Args...>(format_str, args...));
 }
 
 template <typename S, typename OutputIt, typename... Args,
-          typename Char = enable_if_t<
+          typename Char = char_t<S>,
-              detail::is_output_iterator<OutputIt>::value, char_t<S>>>
+          FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, Char>::value)>
 inline OutputIt vformat_to(
     OutputIt out, const std::locale& loc, const S& format_str,
-    format_args_t<type_identity_t<OutputIt>, Char> args) {
+    basic_format_args<buffer_context<type_identity_t<Char>>> args) {
-  using af = detail::arg_formatter<OutputIt, Char>;
+  decltype(detail::get_buffer<Char>(out)) buf(detail::get_buffer_init(out));
-  return vformat_to<af>(out, to_string_view(format_str), args,
+  vformat_to(buf, to_string_view(format_str), args, detail::locale_ref(loc));
-                        detail::locale_ref(loc));
+  return detail::get_iterator(buf);
 }
 
 template <typename OutputIt, typename S, typename... Args,
-          FMT_ENABLE_IF(detail::is_output_iterator<OutputIt>::value&&
+          bool enable = detail::is_output_iterator<OutputIt, char_t<S>>::value>
-                            detail::is_string<S>::value)>
+inline auto format_to(OutputIt out, const std::locale& loc,
-inline OutputIt format_to(OutputIt out, const std::locale& loc,
+                      const S& format_str, Args&&... args) ->
-                          const S& format_str, Args&&... args) {
+    typename std::enable_if<enable, OutputIt>::type {
-  detail::check_format_string<Args...>(format_str);
+  const auto& vargs = fmt::make_args_checked<Args...>(format_str, args...);
-  using context = format_context_t<OutputIt, char_t<S>>;
+  return vformat_to(out, loc, to_string_view(format_str), vargs);
-  format_arg_store<context, Args...> as{args...};
-  return vformat_to(out, loc, to_string_view(format_str),
-                    basic_format_args<context>(as));
 }
 
 FMT_END_NAMESPACE

include/spdlog/fmt/bundled/os.h

@@ -29,7 +29,8 @@
 #if FMT_HAS_INCLUDE("winapifamily.h")
 #  include <winapifamily.h>
 #endif
-#if FMT_HAS_INCLUDE("fcntl.h") && \
+#if (FMT_HAS_INCLUDE(<fcntl.h>) || defined(__APPLE__) || \
+     defined(__linux__)) &&                              \
     (!defined(WINAPI_FAMILY) || (WINAPI_FAMILY == WINAPI_FAMILY_DESKTOP_APP))
 #  include <fcntl.h>  // for O_RDONLY
 #  define FMT_USE_FCNTL 1
@@ -278,7 +279,8 @@ class file {
     RDONLY = FMT_POSIX(O_RDONLY),  // Open for reading only.
     WRONLY = FMT_POSIX(O_WRONLY),  // Open for writing only.
     RDWR = FMT_POSIX(O_RDWR),      // Open for reading and writing.
-    CREATE = FMT_POSIX(O_CREAT)    // Create if the file doesn't exist.
+    CREATE = FMT_POSIX(O_CREAT),   // Create if the file doesn't exist.
+    APPEND = FMT_POSIX(O_APPEND)   // Open in append mode.
   };
 
   // Constructs a file object which doesn't represent any file.
@@ -343,36 +345,69 @@ class file {
 // Returns the memory page size.
 long getpagesize();
 
-class direct_buffered_file;
+namespace detail {
 
-template <typename S, typename... Args>
+struct buffer_size {
-void print(direct_buffered_file& f, const S& format_str,
+  size_t value = 0;
-           const Args&... args);
+  buffer_size operator=(size_t val) const {
+    auto bs = buffer_size();
+    bs.value = val;
+    return bs;
+  }
+};
 
-// A buffered file with a direct buffer access and no synchronization.
+struct ostream_params {
-class direct_buffered_file {
+  int oflag = file::WRONLY | file::CREATE;
+  size_t buffer_size = BUFSIZ > 32768 ? BUFSIZ : 32768;
+
+  ostream_params() {}
+
+  template <typename... T>
+  ostream_params(T... params, int oflag) : ostream_params(params...) {
+    this->oflag = oflag;
+  }
+
+  template <typename... T>
+  ostream_params(T... params, detail::buffer_size bs)
+      : ostream_params(params...) {
+    this->buffer_size = bs.value;
+  }
+};
+}  // namespace detail
+
+static constexpr detail::buffer_size buffer_size;
+
+// A fast output stream which is not thread-safe.
+class ostream final : private detail::buffer<char> {
  private:
   file file_;
 
-  enum { buffer_size = 4096 };
-  char buffer_[buffer_size];
-  int pos_;
-
   void flush() {
-    if (pos_ == 0) return;
+    if (size() == 0) return;
-    file_.write(buffer_, pos_);
+    file_.write(data(), size());
-    pos_ = 0;
+    clear();
   }
 
-  int free_capacity() const { return buffer_size - pos_; }
+  FMT_API void grow(size_t) override final;
+
+  ostream(cstring_view path, const detail::ostream_params& params)
+      : file_(path, params.oflag) {
+    set(new char[params.buffer_size], params.buffer_size);
+  }
 
  public:
-  direct_buffered_file(cstring_view path, int oflag)
+  ostream(ostream&& other)
-    : file_(path, oflag), pos_(0) {}
+      : detail::buffer<char>(other.data(), other.size(), other.capacity()),
-
+        file_(std::move(other.file_)) {
-  ~direct_buffered_file() {
+    other.set(nullptr, 0);
-    flush();
   }
+  ~ostream() {
+    flush();
+    delete[] data();
+  }
+
+  template <typename... T>
+  friend ostream output_file(cstring_view path, T... params);
 
   void close() {
     flush();
@@ -380,25 +415,20 @@ class direct_buffered_file {
   }
 
   template <typename S, typename... Args>
-  friend void print(direct_buffered_file& f, const S& format_str,
+  void print(const S& format_str, const Args&... args) {
-                    const Args&... args) {
+    format_to(detail::buffer_appender<char>(*this), format_str, args...);
-    // We could avoid double buffering.
-    auto buf = fmt::memory_buffer();
-    fmt::format_to(std::back_inserter(buf), format_str, args...);
-    auto remaining_pos = 0;
-    auto remaining_size = buf.size();
-    while (remaining_size > detail::to_unsigned(f.free_capacity())) {
-      auto size = f.free_capacity();
-      memcpy(f.buffer_ + f.pos_, buf.data() + remaining_pos, size);
-      f.pos_ += size;
-      f.flush();
-      remaining_pos += size;
-      remaining_size -= size;
-    }
-    memcpy(f.buffer_ + f.pos_, buf.data() + remaining_pos, remaining_size);
-    f.pos_ += static_cast<int>(remaining_size);
   }
 };
+
+/**
+  Opens a file for writing. Supported parameters passed in `params`:
+  * ``<integer>``: Output flags (``file::WRONLY | file::CREATE`` by default)
+  * ``buffer_size=<integer>``: Output buffer size
+ */
+template <typename... T>
+inline ostream output_file(cstring_view path, T... params) {
+  return {path, detail::ostream_params(params...)};
+}
 #endif  // FMT_USE_FCNTL
 
 #ifdef FMT_LOCALE

include/spdlog/fmt/bundled/ostream.h

@@ -49,17 +49,27 @@ template <class Char> class formatbuf : public std::basic_streambuf<Char> {
   }
 };
 
+struct converter {
+  template <typename T, FMT_ENABLE_IF(is_integral<T>::value)> converter(T);
+};
+
 template <typename Char> struct test_stream : std::basic_ostream<Char> {
  private:
-  // Hide all operator<< from std::basic_ostream<Char>.
+  void_t<> operator<<(converter);
-  void_t<> operator<<(null<>);
-  void_t<> operator<<(const Char*);
-
-  template <typename T, FMT_ENABLE_IF(std::is_convertible<T, int>::value &&
-                                      !std::is_enum<T>::value)>
-  void_t<> operator<<(T);
 };
 
+// Hide insertion operators for built-in types.
+template <typename Char, typename Traits>
+void_t<> operator<<(std::basic_ostream<Char, Traits>&, Char);
+template <typename Char, typename Traits>
+void_t<> operator<<(std::basic_ostream<Char, Traits>&, char);
+template <typename Traits>
+void_t<> operator<<(std::basic_ostream<char, Traits>&, char);
+template <typename Traits>
+void_t<> operator<<(std::basic_ostream<char, Traits>&, signed char);
+template <typename Traits>
+void_t<> operator<<(std::basic_ostream<char, Traits>&, unsigned char);
+
 // Checks if T has a user-defined operator<< (e.g. not a member of
 // std::ostream).
 template <typename T, typename Char> class is_streamable {
@@ -103,7 +113,7 @@ void format_value(buffer<Char>& buf, const T& value,
 #endif
   output << value;
   output.exceptions(std::ios_base::failbit | std::ios_base::badbit);
-  buf.resize(buf.size());
+  buf.try_resize(buf.size());
 }
 
 // Formats an object of type T that has an overloaded ostream operator<<.
@@ -160,7 +170,7 @@ template <typename S, typename... Args,
           typename Char = enable_if_t<detail::is_string<S>::value, char_t<S>>>
 void print(std::basic_ostream<Char>& os, const S& format_str, Args&&... args) {
   vprint(os, to_string_view(format_str),
-         detail::make_args_checked<Args...>(format_str, args...));
+         fmt::make_args_checked<Args...>(format_str, args...));
 }
 FMT_END_NAMESPACE
 

include/spdlog/fmt/bundled/printf.h

@@ -181,7 +181,7 @@ template <typename Char> class printf_width_handler {
 template <typename Char, typename Context>
 void vprintf(buffer<Char>& buf, basic_string_view<Char> format,
              basic_format_args<Context> args) {
-  Context(std::back_inserter(buf), format, args).format();
+  Context(buffer_appender<Char>(buf), format, args).format();
 }
 }  // namespace detail
 
@@ -598,7 +598,7 @@ OutputIt basic_printf_context<OutputIt, Char>::format() {
 
 template <typename Char>
 using basic_printf_context_t =
-    basic_printf_context<std::back_insert_iterator<detail::buffer<Char>>, Char>;
+    basic_printf_context<detail::buffer_appender<Char>, Char>;
 
 using printf_context = basic_printf_context_t<char>;
 using wprintf_context = basic_printf_context_t<wchar_t>;

include/spdlog/fmt/bundled/ranges.h

@@ -157,6 +157,9 @@ template <class Tuple, class F> void for_each(Tuple&& tup, F&& f) {
   for_each(indexes, std::forward<Tuple>(tup), std::forward<F>(f));
 }
 
+template <typename Range>
+using value_type = remove_cvref_t<decltype(*std::declval<Range>().begin())>;
+
 template <typename Arg, FMT_ENABLE_IF(!is_like_std_string<
                                       typename std::decay<Arg>::type>::value)>
 FMT_CONSTEXPR const char* format_str_quoted(bool add_space, const Arg&) {
@@ -182,7 +185,6 @@ FMT_CONSTEXPR const char* format_str_quoted(bool add_space, const char) {
 FMT_CONSTEXPR const wchar_t* format_str_quoted(bool add_space, const wchar_t) {
   return add_space ? L" '{}'" : L"'{}'";
 }
-
 }  // namespace detail
 
 template <typename T> struct is_tuple_like {
@@ -246,9 +248,18 @@ template <typename T, typename Char> struct is_range {
       !std::is_constructible<detail::std_string_view<Char>, T>::value;
 };
 
-template <typename RangeT, typename Char>
+template <typename T, typename Char>
-struct formatter<RangeT, Char,
+struct formatter<
-                 enable_if_t<fmt::is_range<RangeT, Char>::value>> {
+    T, Char,
+    enable_if_t<fmt::is_range<T, Char>::value
+// Workaround a bug in MSVC 2017 and earlier.
+#if !FMT_MSC_VER || FMT_MSC_VER >= 1927
+                &&
+                (has_formatter<detail::value_type<T>, format_context>::value ||
+                 detail::has_fallback_formatter<detail::value_type<T>,
+                                                format_context>::value)
+#endif
+                >> {
   formatting_range<Char> formatting;
 
   template <typename ParseContext>
@@ -257,8 +268,7 @@ struct formatter<RangeT, Char,
   }
 
   template <typename FormatContext>
-  typename FormatContext::iterator format(const RangeT& values,
+  typename FormatContext::iterator format(const T& values, FormatContext& ctx) {
-                                          FormatContext& ctx) {
     auto out = detail::copy(formatting.prefix, ctx.out());
     size_t i = 0;
     auto it = values.begin();

include/spdlog/logger.h

@@ -75,58 +75,58 @@ public:
 
     // FormatString is a type derived from fmt::compile_string
     template<typename FormatString, typename std::enable_if<fmt::is_compile_string<FormatString>::value, int>::type = 0, typename... Args>
-    void log(source_loc loc, level::level_enum lvl, const FormatString &fmt, const Args &...args)
+    void log(source_loc loc, level::level_enum lvl, const FormatString &fmt, Args&&...args)
     {
-        log_(loc, lvl, fmt, args...);
+        log_(loc, lvl, fmt, std::forward<Args>(args)...);
     }
 
     // FormatString is NOT a type derived from fmt::compile_string but is a string_view_t or can be implicitly converted to one
     template<typename... Args>
-    void log(source_loc loc, level::level_enum lvl, string_view_t fmt, const Args &...args)
+    void log(source_loc loc, level::level_enum lvl, string_view_t fmt, Args&&...args)
     {
-        log_(loc, lvl, fmt, args...);
+        log_(loc, lvl, fmt, std::forward<Args>(args)...);
     }
 
     template<typename FormatString, typename... Args>
-    void log(level::level_enum lvl, const FormatString &fmt, const Args &...args)
+    void log(level::level_enum lvl, const FormatString &fmt, Args&&...args)
     {
-        log(source_loc{}, lvl, fmt, args...);
+        log(source_loc{}, lvl, fmt, std::forward<Args>(args)...);
     }
 
     template<typename FormatString, typename... Args>
-    void trace(const FormatString &fmt, const Args &...args)
+    void trace(const FormatString &fmt, Args&&...args)
     {
-        log(level::trace, fmt, args...);
+        log(level::trace, fmt, std::forward<Args>(args)...);
     }
 
     template<typename FormatString, typename... Args>
-    void debug(const FormatString &fmt, const Args &...args)
+    void debug(const FormatString &fmt, Args&&...args)
     {
-        log(level::debug, fmt, args...);
+        log(level::debug, fmt, std::forward<Args>(args)...);
     }
 
     template<typename FormatString, typename... Args>
-    void info(const FormatString &fmt, const Args &...args)
+    void info(const FormatString &fmt, Args&&...args)
     {
-        log(level::info, fmt, args...);
+        log(level::info, fmt, std::forward<Args>(args)...);
     }
 
     template<typename FormatString, typename... Args>
-    void warn(const FormatString &fmt, const Args &...args)
+    void warn(const FormatString &fmt, Args&&...args)
     {
-        log(level::warn, fmt, args...);
+        log(level::warn, fmt, std::forward<Args>(args)...);
     }
 
     template<typename FormatString, typename... Args>
-    void error(const FormatString &fmt, const Args &...args)
+    void error(const FormatString &fmt, Args&&...args)
     {
-        log(level::err, fmt, args...);
+        log(level::err, fmt, std::forward<Args>(args)...);
     }
 
     template<typename FormatString, typename... Args>
-    void critical(const FormatString &fmt, const Args &...args)
+    void critical(const FormatString &fmt, Args&&...args)
     {
-        log(level::critical, fmt, args...);
+        log(level::critical, fmt, std::forward<Args>(args)...);
     }
 
     template<typename T>
@@ -225,7 +225,7 @@ public:
 #else
 
     template<typename... Args>
-    void log(source_loc loc, level::level_enum lvl, wstring_view_t fmt, const Args &...args)
+    void log(source_loc loc, level::level_enum lvl, wstring_view_t fmt, Args&&...args)
     {
         bool log_enabled = should_log(lvl);
         bool traceback_enabled = tracer_.enabled();
@@ -237,7 +237,7 @@ public:
         {
             // format to wmemory_buffer and convert to utf8
             fmt::wmemory_buffer wbuf;
-            fmt::format_to(wbuf, fmt, args...);
+            fmt::format_to(wbuf, fmt, std::forward<Args>(args)...);
 
             memory_buf_t buf;
             details::os::wstr_to_utf8buf(wstring_view_t(wbuf.data(), wbuf.size()), buf);
@@ -326,7 +326,7 @@ protected:
 
     // common implementation for after templated public api has been resolved
     template<typename FormatString, typename... Args>
-    void log_(source_loc loc, level::level_enum lvl, const FormatString &fmt, const Args &...args)
+    void log_(source_loc loc, level::level_enum lvl, const FormatString &fmt, Args&&...args)
     {
         bool log_enabled = should_log(lvl);
         bool traceback_enabled = tracer_.enabled();
@@ -337,7 +337,7 @@ protected:
         SPDLOG_TRY
         {
             memory_buf_t buf;
-            fmt::format_to(buf, fmt, args...);
+            fmt::format_to(buf, fmt, std::forward<Args>(args)...);
             details::log_msg log_msg(loc, name_, lvl, string_view_t(buf.data(), buf.size()));
             log_it_(log_msg, log_enabled, traceback_enabled);
         }

include/spdlog/pattern_formatter-inl.h

@@ -13,11 +13,13 @@
 #include <spdlog/fmt/fmt.h>
 #include <spdlog/formatter.h>
 
+#include <algorithm>
 #include <array>
 #include <chrono>
 #include <ctime>
 #include <cctype>
 #include <cstring>
+#include <iterator>
 #include <memory>
 #include <mutex>
 #include <string>
@@ -127,7 +129,7 @@ public:
 
     void format(const details::log_msg &msg, const std::tm &, memory_buf_t &dest) override
     {
-        string_view_t &level_name = level::to_string_view(msg.level);
+        const string_view_t &level_name = level::to_string_view(msg.level);
         ScopedPadder p(level_name.size(), padinfo_, dest);
         fmt_helper::append_string_view(level_name, dest);
     }
@@ -814,11 +816,31 @@ public:
         : flag_formatter(padinfo)
     {}
 
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable : 4127) // consider using 'if constexpr' instead
+#endif // _MSC_VER
     static const char *basename(const char *filename)
     {
-        const char *rv = std::strrchr(filename, os::folder_sep);
+        // if the size is 2 (1 character + null terminator) we can use the more efficient strrchr
-        return rv != nullptr ? rv + 1 : filename;
+        // the branch will be elided by optimizations
+        if (sizeof(os::folder_seps) == 2)
+        {
+            const char *rv = std::strrchr(filename, os::folder_seps[0]);
+            return rv != nullptr ? rv + 1 : filename;
+        }
+        else
+        {
+            const std::reverse_iterator<const char*> begin(filename + std::strlen(filename));
+            const std::reverse_iterator<const char*> end(filename);
+
+            const auto it = std::find_first_of(begin, end, std::begin(os::folder_seps), std::end(os::folder_seps) - 1);
+            return it != end ? it.base() : filename;
+        }
     }
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif // _MSC_VER
 
     void format(const details::log_msg &msg, const std::tm &, memory_buf_t &dest) override
     {

include/spdlog/pattern_formatter.h

@@ -92,9 +92,9 @@ public:
     void format(const details::log_msg &msg, memory_buf_t &dest) override;
 
     template<typename T, typename... Args>
-    pattern_formatter &add_flag(char flag, const Args &...args)
+    pattern_formatter &add_flag(char flag, Args&&...args)
     {
-        custom_handlers_[flag] = details::make_unique<T>(args...);
+        custom_handlers_[flag] = details::make_unique<T>(std::forward<Args>(args)...);
         return *this;
     }
     void set_pattern(std::string pattern);

include/spdlog/sinks/ansicolor_sink-inl.h

@@ -106,6 +106,8 @@ SPDLOG_INLINE void ansicolor_sink<ConsoleMutex>::set_color_mode(color_mode mode)
     case color_mode::never:
         should_do_colors_ = false;
         return;
+    default:
+        should_do_colors_ = false;
     }
 }
 

include/spdlog/sinks/daily_file_sink.h

@@ -7,6 +7,7 @@
 #include <spdlog/details/file_helper.h>
 #include <spdlog/details/null_mutex.h>
 #include <spdlog/fmt/fmt.h>
+#include <spdlog/fmt/chrono.h>
 #include <spdlog/sinks/base_sink.h>
 #include <spdlog/details/os.h>
 #include <spdlog/details/circular_q.h>
@@ -36,6 +37,23 @@ struct daily_filename_calculator
     }
 };
 
+/*
+ * Generator of daily log file names with strftime format.
+ * Usages:  
+ *    auto sink =  std::make_shared<spdlog::sinks::daily_file_format_sink_mt>("myapp-%Y-%m-%d:%H:%M:%S.log", hour, minute);"
+ *    auto logger = spdlog::daily_logger_format_mt("loggername, "myapp-%Y-%m-%d:%X.log", hour,  minute)"
+ *  
+ */
+struct daily_filename_format_calculator
+{
+    static filename_t calc_filename (const filename_t &filename, const tm &now_tm)
+    {
+         // generate fmt datetime format string, e.g. {:%Y-%m-%d}.
+        filename_t fmt_filename = fmt::format(SPDLOG_FILENAME_T ("{{:{}}}"), filename);
+        return fmt::format(fmt_filename, now_tm);
+    }
+};
+
 /*
  * Rotating file sink based on date.
  * If truncate != false , the created file will be truncated.
@@ -182,6 +200,8 @@ private:
 
 using daily_file_sink_mt = daily_file_sink<std::mutex>;
 using daily_file_sink_st = daily_file_sink<details::null_mutex>;
+using daily_file_format_sink_mt = daily_file_sink<std::mutex, daily_filename_format_calculator>;
+using daily_file_format_sink_st = daily_file_sink<details::null_mutex, daily_filename_format_calculator>;
 
 } // namespace sinks
 
@@ -195,10 +215,24 @@ inline std::shared_ptr<logger> daily_logger_mt(
     return Factory::template create<sinks::daily_file_sink_mt>(logger_name, filename, hour, minute, truncate, max_files);
 }
 
+template<typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> daily_logger_format_mt(
+    const std::string &logger_name, const filename_t &filename, int hour = 0, int minute = 0, bool truncate = false, uint16_t max_files = 0)
+{
+    return Factory::template create<sinks::daily_file_format_sink_mt>(logger_name, filename, hour, minute, truncate, max_files);
+}
+
 template<typename Factory = spdlog::synchronous_factory>
 inline std::shared_ptr<logger> daily_logger_st(
     const std::string &logger_name, const filename_t &filename, int hour = 0, int minute = 0, bool truncate = false, uint16_t max_files = 0)
 {
     return Factory::template create<sinks::daily_file_sink_st>(logger_name, filename, hour, minute, truncate, max_files);
 }
+
+template<typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> daily_logger_format_st(
+    const std::string &logger_name, const filename_t &filename, int hour = 0, int minute = 0, bool truncate = false, uint16_t max_files = 0)
+{
+    return Factory::template create<sinks::daily_file_format_sink_st>(logger_name, filename, hour, minute, truncate, max_files);
+}
 } // namespace spdlog

include/spdlog/sinks/dup_filter_sink.h

@@ -64,7 +64,7 @@ protected:
         {
             memory_buf_t buf;
             fmt::format_to(buf, "Skipped {} duplicate messages..", skip_counter_);
-            details::log_msg skipped_msg{msg.logger_name, msg.level, string_view_t{buf.data(), buf.size()}};
+            details::log_msg skipped_msg{msg.logger_name, level::info, string_view_t{buf.data(), buf.size()}};
             dist_sink<Mutex>::sink_it_(skipped_msg);
         }
 

include/spdlog/sinks/hourly_file_sink.h

@@ -0,0 +1,194 @@
+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include <spdlog/common.h>
+#include <spdlog/details/file_helper.h>
+#include <spdlog/details/null_mutex.h>
+#include <spdlog/fmt/fmt.h>
+#include <spdlog/sinks/base_sink.h>
+#include <spdlog/details/os.h>
+#include <spdlog/details/circular_q.h>
+#include <spdlog/details/synchronous_factory.h>
+
+#include <chrono>
+#include <cstdio>
+#include <ctime>
+#include <mutex>
+#include <string>
+
+namespace spdlog {
+namespace sinks {
+
+/*
+ * Generator of Hourly log file names in format basename.YYYY-MM-DD-HH.ext
+ */
+struct hourly_filename_calculator
+{
+    // Create filename for the form basename.YYYY-MM-DD-H
+    static filename_t calc_filename(const filename_t &filename, const tm &now_tm)
+    {
+        filename_t basename, ext;
+        std::tie(basename, ext) = details::file_helper::split_by_extension(filename);
+        return fmt::format(
+            SPDLOG_FILENAME_T("{}_{:04d}{:02d}{:02d}_{:02d}{}"), basename, now_tm.tm_year + 1900, now_tm.tm_mon + 1, now_tm.tm_mday, now_tm.tm_hour, ext);
+    }
+};
+
+/*
+ * Rotating file sink based on time.
+ * If truncate != false , the created file will be truncated.
+ * If max_files > 0, retain only the last max_files and delete previous.
+ */
+template<typename Mutex, typename FileNameCalc = hourly_filename_calculator>
+class hourly_file_sink final : public base_sink<Mutex>
+{
+public:
+    // create hourly file sink which rotates on given time
+    hourly_file_sink(filename_t base_filename, bool truncate = false, uint16_t max_files = 0)
+        : base_filename_(std::move(base_filename))
+        , truncate_(truncate)
+        , max_files_(max_files)
+        , filenames_q_()
+    {
+        auto now = log_clock::now();
+        auto filename = FileNameCalc::calc_filename(base_filename_, now_tm(now));
+        file_helper_.open(filename, truncate_);
+        rotation_tp_ = next_rotation_tp_();
+
+        if (max_files_ > 0)
+        {
+            init_filenames_q_();
+        }
+    }
+
+    filename_t filename()
+    {
+        std::lock_guard<Mutex> lock(base_sink<Mutex>::mutex_);
+        return file_helper_.filename();
+    }
+
+protected:
+    void sink_it_(const details::log_msg &msg) override
+    {
+        auto time = msg.time;
+        bool should_rotate = time >= rotation_tp_;
+        if (should_rotate)
+        {
+            auto filename = FileNameCalc::calc_filename(base_filename_, now_tm(time));
+            file_helper_.open(filename, truncate_);
+            rotation_tp_ = next_rotation_tp_();
+        }
+        memory_buf_t formatted;
+        base_sink<Mutex>::formatter_->format(msg, formatted);
+        file_helper_.write(formatted);
+
+        // Do the cleaning only at the end because it might throw on failure.
+        if (should_rotate && max_files_ > 0)
+        {
+            delete_old_();
+        }
+    }
+
+    void flush_() override
+    {
+        file_helper_.flush();
+    }
+
+private:
+    void init_filenames_q_()
+    {
+        using details::os::path_exists;
+
+        filenames_q_ = details::circular_q<filename_t>(static_cast<size_t>(max_files_));
+        std::vector<filename_t> filenames;
+        auto now = log_clock::now();
+        while (filenames.size() < max_files_)
+        {
+            auto filename = FileNameCalc::calc_filename(base_filename_, now_tm(now));
+            if (!path_exists(filename))
+            {
+                break;
+            }
+            filenames.emplace_back(filename);
+            now -= std::chrono::hours(1);
+        }
+        for (auto iter = filenames.rbegin(); iter != filenames.rend(); ++iter)
+        {
+            filenames_q_.push_back(std::move(*iter));
+        }
+    }
+
+    tm now_tm(log_clock::time_point tp)
+    {
+        time_t tnow = log_clock::to_time_t(tp);
+        return spdlog::details::os::localtime(tnow);
+    }
+
+    log_clock::time_point next_rotation_tp_()
+    {
+        auto now = log_clock::now();
+        tm date = now_tm(now);
+        date.tm_min = 0;
+        date.tm_sec = 0;
+        auto rotation_time = log_clock::from_time_t(std::mktime(&date));
+        if (rotation_time > now)
+        {
+            return rotation_time;
+        }
+        return {rotation_time + std::chrono::hours(1)};
+    }
+
+    // Delete the file N rotations ago.
+    // Throw spdlog_ex on failure to delete the old file.
+    void delete_old_()
+    {
+        using details::os::filename_to_str;
+        using details::os::remove_if_exists;
+
+        filename_t current_file = file_helper_.filename();
+        if (filenames_q_.full())
+        {
+            auto old_filename = std::move(filenames_q_.front());
+            filenames_q_.pop_front();
+            bool ok = remove_if_exists(old_filename) == 0;
+            if (!ok)
+            {
+                filenames_q_.push_back(std::move(current_file));
+                SPDLOG_THROW(spdlog_ex("Failed removing hourly file " + filename_to_str(old_filename), errno));
+            }
+        }
+        filenames_q_.push_back(std::move(current_file));
+    }
+
+    filename_t base_filename_;
+    log_clock::time_point rotation_tp_;
+    details::file_helper file_helper_;
+    bool truncate_;
+    uint16_t max_files_;
+    details::circular_q<filename_t> filenames_q_;
+};
+
+using hourly_file_sink_mt = hourly_file_sink<std::mutex>;
+using hourly_file_sink_st = hourly_file_sink<details::null_mutex>;
+
+} // namespace sinks
+
+//
+// factory functions
+//
+template<typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> hourly_logger_mt(
+    const std::string &logger_name, const filename_t &filename, bool truncate = false, uint16_t max_files = 0)
+{
+    return Factory::template create<sinks::hourly_file_sink_mt>(logger_name, filename, truncate, max_files);
+}
+
+template<typename Factory = spdlog::synchronous_factory>
+inline std::shared_ptr<logger> hourly_logger_st(
+    const std::string &logger_name, const filename_t &filename, bool truncate = false, uint16_t max_files = 0)
+{
+    return Factory::template create<sinks::hourly_file_sink_st>(logger_name, filename, truncate, max_files);
+}
+} // namespace spdlog

include/spdlog/sinks/stdout_sinks-inl.h

@@ -32,8 +32,13 @@ SPDLOG_INLINE stdout_sink_base<ConsoleMutex>::stdout_sink_base(FILE *file)
 {
 #ifdef _WIN32
     // get windows handle from the FILE* object
+    
     handle_ = (HANDLE)::_get_osfhandle(::_fileno(file_));    
-    if (handle_ == INVALID_HANDLE_VALUE)
+        
+    // don't throw to support cases where no console is attached,
+    // and let the log method to do nothing if (handle_ == INVALID_HANDLE_VALUE).
+    // throw only if non stdout/stderr target is requested (probably regular file and not console).
+    if (handle_ == INVALID_HANDLE_VALUE && file != stdout && file != stderr)
     {
         throw_spdlog_ex("spdlog::stdout_sink_base: _get_osfhandle() failed", errno);
     }
@@ -43,10 +48,14 @@ SPDLOG_INLINE stdout_sink_base<ConsoleMutex>::stdout_sink_base(FILE *file)
 template<typename ConsoleMutex>
 SPDLOG_INLINE void stdout_sink_base<ConsoleMutex>::log(const details::log_msg &msg)
 {
+#ifdef _WIN32
+    if (handle_ == INVALID_HANDLE_VALUE)
+    {        
+        return;
+    }
     std::lock_guard<mutex_t> lock(mutex_);
     memory_buf_t formatted;
     formatter_->format(msg, formatted);
-#ifdef _WIN32
     ::fflush(file_); // flush in case there is somthing in this file_ already
     auto size = static_cast<DWORD>(formatted.size());
     DWORD bytes_written = 0;
@@ -56,6 +65,9 @@ SPDLOG_INLINE void stdout_sink_base<ConsoleMutex>::log(const details::log_msg &m
         throw_spdlog_ex("stdout_sink_base: WriteFile() failed. GetLastError(): " + std::to_string(::GetLastError()));
     }
 #else
+    std::lock_guard<mutex_t> lock(mutex_);
+    memory_buf_t formatted;
+    formatter_->format(msg, formatted);
     ::fwrite(formatted.data(), sizeof(char), formatted.size(), file_);
     ::fflush(file_); // flush every line to terminal
 #endif // WIN32    

include/spdlog/sinks/win_eventlog_sink.h

@@ -57,7 +57,7 @@ struct win32_error : public spdlog_ex
 
         LPSTR format_message_result{};
         auto format_message_succeeded =
-            ::FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, nullptr,
+            ::FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, nullptr,
                 error_code, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPSTR)&format_message_result, 0, nullptr);
 
         if (format_message_succeeded && format_message_result)
@@ -203,7 +203,7 @@ private:
     {
         if (!hEventLog_)
         {
-            hEventLog_ = ::RegisterEventSource(nullptr, source_.c_str());
+            hEventLog_ = ::RegisterEventSourceA(nullptr, source_.c_str());
             if (!hEventLog_ || hEventLog_ == (HANDLE)ERROR_ACCESS_DENIED)
             {
                 SPDLOG_THROW(internal::win32_error("RegisterEventSource"));
@@ -218,13 +218,23 @@ protected:
     {
         using namespace internal;
 
+        bool succeeded;
         memory_buf_t formatted;
         base_sink<Mutex>::formatter_->format(msg, formatted);
         formatted.push_back('\0');
-        LPCSTR lp_str = static_cast<LPCSTR>(formatted.data());
 
-        auto succeeded = ::ReportEvent(event_log_handle(), eventlog::get_event_type(msg), eventlog::get_event_category(msg), event_id_,
+#ifdef SPDLOG_WCHAR_TO_UTF8_SUPPORT
-            current_user_sid_.as_sid(), 1, 0, &lp_str, nullptr);
+        wmemory_buf_t buf;
+        details::os::utf8_to_wstrbuf(string_view_t(formatted.data(), formatted.size()), buf);
+
+        LPCWSTR lp_wstr = buf.data();
+        succeeded = ::ReportEventW(event_log_handle(), eventlog::get_event_type(msg), eventlog::get_event_category(msg), event_id_,
+                current_user_sid_.as_sid(), 1, 0, &lp_wstr, nullptr);
+#else
+        LPCSTR lp_str = formatted.data();
+        succeeded = ::ReportEventA(event_log_handle(), eventlog::get_event_type(msg), eventlog::get_event_category(msg), event_id_,
+                current_user_sid_.as_sid(), 1, 0, &lp_str, nullptr);
+#endif
 
         if (!succeeded)
         {

include/spdlog/sinks/wincolor_sink-inl.h

@@ -7,30 +7,30 @@
 #include <spdlog/sinks/wincolor_sink.h>
 #endif
 
+#include <spdlog/details/windows_include.h>
+#include <wincon.h>
+
 #include <spdlog/common.h>
 #include <spdlog/pattern_formatter.h>
 
 namespace spdlog {
 namespace sinks {
-
 template<typename ConsoleMutex>
-SPDLOG_INLINE wincolor_sink<ConsoleMutex>::wincolor_sink(HANDLE out_handle, color_mode mode)
+SPDLOG_INLINE wincolor_sink<ConsoleMutex>::wincolor_sink(void *out_handle, color_mode mode)
     : out_handle_(out_handle)
     , mutex_(ConsoleMutex::mutex())
     , formatter_(details::make_unique<spdlog::pattern_formatter>())
 {
-    // check if out_handle is points to the actual console.
-    // ::GetConsoleMode() should return 0 if it is redirected or not valid console handle.
-    DWORD console_mode;
-    in_console_ = ::GetConsoleMode(out_handle, &console_mode) != 0;
 
-    set_color_mode(mode);
+    set_color_mode_impl(mode);
-    colors_[level::trace] = WHITE;
+    // set level colors
-    colors_[level::debug] = CYAN;
+    colors_[level::trace] = FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE;     // white
-    colors_[level::info] = GREEN;
+    colors_[level::debug] = FOREGROUND_GREEN | FOREGROUND_BLUE;                      // cyan
-    colors_[level::warn] = YELLOW | BOLD;
+    colors_[level::info] = FOREGROUND_GREEN;                                         // green
-    colors_[level::err] = RED | BOLD;                         // red bold
+    colors_[level::warn] = FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_INTENSITY; // intense yellow
-    colors_[level::critical] = BACKGROUND_RED | WHITE | BOLD; // white bold on red background
+    colors_[level::err] = FOREGROUND_RED | FOREGROUND_INTENSITY;                     // intense red
+    colors_[level::critical] =
+        BACKGROUND_RED | FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE | FOREGROUND_INTENSITY; // intense white on red background
     colors_[level::off] = 0;
 }
 
@@ -42,7 +42,7 @@ SPDLOG_INLINE wincolor_sink<ConsoleMutex>::~wincolor_sink()
 
 // change the color for the given level
 template<typename ConsoleMutex>
-void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::set_color(level::level_enum level, WORD color)
+void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::set_color(level::level_enum level, std::uint16_t color)
 {
     std::lock_guard<mutex_t> lock(mutex_);
     colors_[level] = color;
@@ -51,31 +51,30 @@ void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::set_color(level::level_enum leve
 template<typename ConsoleMutex>
 void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::log(const details::log_msg &msg)
 {
+    if (out_handle_ == nullptr || out_handle_ == INVALID_HANDLE_VALUE)
+    {
+        return;
+    }
+
     std::lock_guard<mutex_t> lock(mutex_);
     msg.color_range_start = 0;
     msg.color_range_end = 0;
     memory_buf_t formatted;
     formatter_->format(msg, formatted);
-    if (!in_console_)
-    {
-        write_to_file_(formatted);
-        return;
-    }
     if (should_do_colors_ && msg.color_range_end > msg.color_range_start)
     {
         // before color range
         print_range_(formatted, 0, msg.color_range_start);
-
         // in color range
-        auto orig_attribs = set_foreground_color_(colors_[msg.level]);
+        auto orig_attribs = static_cast<WORD>(set_foreground_color_(colors_[msg.level]));
         print_range_(formatted, msg.color_range_start, msg.color_range_end);
         // reset to orig colors
-        ::SetConsoleTextAttribute(out_handle_, orig_attribs);
+        ::SetConsoleTextAttribute(static_cast<HANDLE>(out_handle_), orig_attribs);
         print_range_(formatted, msg.color_range_end, formatted.size());
     }
     else // print without colors if color range is invalid (or color is disabled)
     {
-        print_range_(formatted, 0, formatted.size());
+        write_to_file_(formatted);
     }
 }
 
@@ -102,56 +101,63 @@ void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::set_formatter(std::unique_ptr<sp
 template<typename ConsoleMutex>
 void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::set_color_mode(color_mode mode)
 {
-    switch (mode)
+    std::lock_guard<mutex_t> lock(mutex_);
+    set_color_mode_impl(mode);
+}
+
+template<typename ConsoleMutex>
+void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::set_color_mode_impl(color_mode mode)
+{
+    if (mode == color_mode::automatic)
     {
-    case color_mode::always:
+        // should do colors only if out_handle_  points to actual console.
-    case color_mode::automatic:
+        DWORD console_mode;
-        should_do_colors_ = true;
+        bool in_console = ::GetConsoleMode(static_cast<HANDLE>(out_handle_), &console_mode) != 0;
-        break;
+        should_do_colors_ = in_console;
-    case color_mode::never:
+    }
-        should_do_colors_ = false;
+    else
-        break;
+    {
-    default:
+        should_do_colors_ = mode == color_mode::always ? true : false;
-        should_do_colors_ = true;
     }
 }
 
 // set foreground color and return the orig console attributes (for resetting later)
 template<typename ConsoleMutex>
-WORD SPDLOG_INLINE wincolor_sink<ConsoleMutex>::set_foreground_color_(WORD attribs)
+std::uint16_t SPDLOG_INLINE wincolor_sink<ConsoleMutex>::set_foreground_color_(std::uint16_t attribs)
 {
     CONSOLE_SCREEN_BUFFER_INFO orig_buffer_info;
-    ::GetConsoleScreenBufferInfo(out_handle_, &orig_buffer_info);
+    if (!::GetConsoleScreenBufferInfo(static_cast<HANDLE>(out_handle_), &orig_buffer_info))
-    WORD back_color = orig_buffer_info.wAttributes;
+    {
-    // retrieve the current background color
+        // just return white if failed getting console info
-    back_color &= static_cast<WORD>(~(FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE | FOREGROUND_INTENSITY));
+        return FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE; 
-    // keep the background color unchanged
+    }
-    ::SetConsoleTextAttribute(out_handle_, attribs | back_color);
+    
-    return orig_buffer_info.wAttributes; // return orig attribs
+    // change only the foreground bits (lowest 4 bits) 
+    auto new_attribs = static_cast<WORD>(attribs) | (orig_buffer_info.wAttributes & 0xfff0);
+    auto ignored = ::SetConsoleTextAttribute(static_cast<HANDLE>(out_handle_), static_cast<WORD>(new_attribs));
+    (void)(ignored);
+    return static_cast<std::uint16_t>(orig_buffer_info.wAttributes); // return orig attribs
 }
 
 // print a range of formatted message to console
 template<typename ConsoleMutex>
 void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::print_range_(const memory_buf_t &formatted, size_t start, size_t end)
 {
-    auto size = static_cast<DWORD>(end - start);
+    if (end > start)
-    ::WriteConsoleA(out_handle_, formatted.data() + start, size, nullptr, nullptr);
+    {
+        auto size = static_cast<DWORD>(end - start);
+        auto ignored = ::WriteConsoleA(static_cast<HANDLE>(out_handle_), formatted.data() + start, size, nullptr, nullptr);
+        (void)(ignored);
+    }
 }
 
 template<typename ConsoleMutex>
 void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::write_to_file_(const memory_buf_t &formatted)
 {
-    if (out_handle_ == nullptr) // no console and no file redirect
-    {
-        return;
-    }
     auto size = static_cast<DWORD>(formatted.size());
     DWORD bytes_written = 0;
-    bool ok = ::WriteFile(out_handle_, formatted.data(), size, &bytes_written, nullptr) != 0;
+    auto ignored = ::WriteFile(static_cast<HANDLE>(out_handle_), formatted.data(), size, &bytes_written, nullptr);
-    if (!ok)
+    (void)(ignored);
-    {
-        throw_spdlog_ex("wincolor_sink: ::WriteFile() failed. GetLastError(): " + std::to_string(::GetLastError()));
-    }
 }
 
 // wincolor_stdout_sink
@@ -165,6 +171,5 @@ template<typename ConsoleMutex>
 SPDLOG_INLINE wincolor_stderr_sink<ConsoleMutex>::wincolor_stderr_sink(color_mode mode)
     : wincolor_sink<ConsoleMutex>(::GetStdHandle(STD_ERROR_HANDLE), mode)
 {}
-
 } // namespace sinks
 } // namespace spdlog

include/spdlog/sinks/wincolor_sink.h

@@ -12,9 +12,7 @@
 #include <mutex>
 #include <string>
 #include <array>
-
+#include <cstdint>
-#include <spdlog/details/windows_include.h>
-#include <wincon.h>
 
 namespace spdlog {
 namespace sinks {
@@ -26,21 +24,14 @@ template<typename ConsoleMutex>
 class wincolor_sink : public sink
 {
 public:   
-    const WORD BOLD = FOREGROUND_INTENSITY;
+    wincolor_sink(void *out_handle, color_mode mode);
-    const WORD RED = FOREGROUND_RED;
-    const WORD GREEN = FOREGROUND_GREEN;
-    const WORD CYAN = FOREGROUND_GREEN | FOREGROUND_BLUE;
-    const WORD WHITE = FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE;
-    const WORD YELLOW = FOREGROUND_RED | FOREGROUND_GREEN;
-
-    wincolor_sink(HANDLE out_handle, color_mode mode);
     ~wincolor_sink() override;
 
     wincolor_sink(const wincolor_sink &other) = delete;
     wincolor_sink &operator=(const wincolor_sink &other) = delete;
 
     // change the color for the given level
-    void set_color(level::level_enum level, WORD color);
+    void set_color(level::level_enum level, std::uint16_t color);
     void log(const details::log_msg &msg) final override;
     void flush() final override;
     void set_pattern(const std::string &pattern) override final;
@@ -49,21 +40,22 @@ public:
 
 protected:
     using mutex_t = typename ConsoleMutex::mutex_t;
-    HANDLE out_handle_;
+    void *out_handle_;
     mutex_t &mutex_;    
-    bool in_console_;
     bool should_do_colors_;
     std::unique_ptr<spdlog::formatter> formatter_;
-    std::array<WORD, level::n_levels> colors_;
+    std::array<std::uint16_t, level::n_levels> colors_;
 
     // set foreground color and return the orig console attributes (for resetting later)
-    WORD set_foreground_color_(WORD attribs);
+    std::uint16_t set_foreground_color_(std::uint16_t attribs);
 
     // print a range of formatted message to console
     void print_range_(const memory_buf_t &formatted, size_t start, size_t end);
 
     // in case we are redirected to file (not in console mode)
     void write_to_file_(const memory_buf_t &formatted);
+
+    void set_color_mode_impl(color_mode mode);
 };
 
 template<typename ConsoleMutex>
@@ -85,7 +77,6 @@ using wincolor_stdout_sink_st = wincolor_stdout_sink<details::console_nullmutex>
 
 using wincolor_stderr_sink_mt = wincolor_stderr_sink<details::console_mutex>;
 using wincolor_stderr_sink_st = wincolor_stderr_sink<details::console_nullmutex>;
-
 } // namespace sinks
 } // namespace spdlog
 

include/spdlog/spdlog.h

@@ -111,7 +111,7 @@ SPDLOG_API void set_automatic_registration(bool automatic_registration);
 //
 // The default logger object can be accessed using the spdlog::default_logger():
 // For example, to add another sink to it:
-// spdlog::default_logger()->sinks()->push_back(some_sink);
+// spdlog::default_logger()->sinks().push_back(some_sink);
 //
 // The default logger can replaced using spdlog::set_default_logger(new_logger).
 // For example, to replace it with a file logger.
@@ -128,51 +128,51 @@ SPDLOG_API spdlog::logger *default_logger_raw();
 SPDLOG_API void set_default_logger(std::shared_ptr<spdlog::logger> default_logger);
 
 template<typename FormatString, typename... Args>
-inline void log(source_loc source, level::level_enum lvl, const FormatString &fmt, const Args &...args)
+inline void log(source_loc source, level::level_enum lvl, const FormatString &fmt, Args&&...args)
 {
-    default_logger_raw()->log(source, lvl, fmt, args...);
+    default_logger_raw()->log(source, lvl, fmt, std::forward<Args>(args)...);
 }
 
 template<typename FormatString, typename... Args>
-inline void log(level::level_enum lvl, const FormatString &fmt, const Args &...args)
+inline void log(level::level_enum lvl, const FormatString &fmt, Args&&...args)
 {
-    default_logger_raw()->log(source_loc{}, lvl, fmt, args...);
+    default_logger_raw()->log(source_loc{}, lvl, fmt, std::forward<Args>(args)...);
 }
 
 template<typename FormatString, typename... Args>
-inline void trace(const FormatString &fmt, const Args &...args)
+inline void trace(const FormatString &fmt, Args&&...args)
 {
-    default_logger_raw()->trace(fmt, args...);
+    default_logger_raw()->trace(fmt, std::forward<Args>(args)...);
 }
 
 template<typename FormatString, typename... Args>
-inline void debug(const FormatString &fmt, const Args &...args)
+inline void debug(const FormatString &fmt, Args&&...args)
 {
-    default_logger_raw()->debug(fmt, args...);
+    default_logger_raw()->debug(fmt, std::forward<Args>(args)...);
 }
 
 template<typename FormatString, typename... Args>
-inline void info(const FormatString &fmt, const Args &...args)
+inline void info(const FormatString &fmt, Args&&...args)
 {
-    default_logger_raw()->info(fmt, args...);
+    default_logger_raw()->info(fmt, std::forward<Args>(args)...);
 }
 
 template<typename FormatString, typename... Args>
-inline void warn(const FormatString &fmt, const Args &...args)
+inline void warn(const FormatString &fmt, Args&&...args)
 {
-    default_logger_raw()->warn(fmt, args...);
+    default_logger_raw()->warn(fmt, std::forward<Args>(args)...);
 }
 
 template<typename FormatString, typename... Args>
-inline void error(const FormatString &fmt, const Args &...args)
+inline void error(const FormatString &fmt, Args&&...args)
 {
-    default_logger_raw()->error(fmt, args...);
+    default_logger_raw()->error(fmt, std::forward<Args>(args)...);
 }
 
 template<typename FormatString, typename... Args>
-inline void critical(const FormatString &fmt, const Args &...args)
+inline void critical(const FormatString &fmt, Args&&...args)
 {
-    default_logger_raw()->critical(fmt, args...);
+    default_logger_raw()->critical(fmt, std::forward<Args>(args)...);
 }
 
 template<typename T>

include/spdlog/tweakme.h

@@ -58,6 +58,14 @@
 // #define SPDLOG_EOL ";-)\n"
 ///////////////////////////////////////////////////////////////////////////////
 
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment to override default folder separators ("/" or "\\/" under
+// Linux/Windows). Each character in the string is treated as a different
+// separator.
+//
+// #define SPDLOG_FOLDER_SEPS "\\"
+///////////////////////////////////////////////////////////////////////////////
+
 ///////////////////////////////////////////////////////////////////////////////
 // Uncomment to use your own copy of the fmt library instead of spdlog's copy.
 // In this case spdlog will try to include <fmt/format.h> so set your -I flag

include/spdlog/version.h

@@ -5,6 +5,6 @@
 
 #define SPDLOG_VER_MAJOR 1
 #define SPDLOG_VER_MINOR 8
-#define SPDLOG_VER_PATCH 1
+#define SPDLOG_VER_PATCH 4
 
 #define SPDLOG_VERSION (SPDLOG_VER_MAJOR * 10000 + SPDLOG_VER_MINOR * 100 + SPDLOG_VER_PATCH)

src/fmt.cpp

@@ -9,29 +9,63 @@
 #if !defined(SPDLOG_FMT_EXTERNAL)
 #include <spdlog/fmt/bundled/format-inl.h>
 
+
 FMT_BEGIN_NAMESPACE
 namespace detail {
 
-template<typename T>
+template <typename T>
-int format_float(char *buf, std::size_t size, const char *format, int precision, T value)
+int format_float(char* buf, std::size_t size, const char* format, int precision,
-{
+                 T value) {
 #ifdef FMT_FUZZ
-    if (precision > 100000)
+  if (precision > 100000)
-        throw std::runtime_error("fuzz mode - avoid large allocation inside snprintf");
+    throw std::runtime_error(
+        "fuzz mode - avoid large allocation inside snprintf");
 #endif
-    // Suppress the warning about nonliteral format string.
+  // Suppress the warning about nonliteral format string.
-    int (*snprintf_ptr)(char *, size_t, const char *, ...) = FMT_SNPRINTF;
+  int (*snprintf_ptr)(char*, size_t, const char*, ...) = FMT_SNPRINTF;
-    return precision < 0 ? snprintf_ptr(buf, size, format, value) : snprintf_ptr(buf, size, format, precision, value);
+  return precision < 0 ? snprintf_ptr(buf, size, format, value)
+                       : snprintf_ptr(buf, size, format, precision, value);
 }
-} // namespace detail
+
+template FMT_API dragonbox::decimal_fp<float> dragonbox::to_decimal(float x)
+    FMT_NOEXCEPT;
+template FMT_API dragonbox::decimal_fp<double> dragonbox::to_decimal(double x)
+    FMT_NOEXCEPT;
+
+// DEPRECATED! This function exists for ABI compatibility.
+template <typename Char>
+typename basic_format_context<std::back_insert_iterator<buffer<Char>>,
+                              Char>::iterator
+vformat_to(buffer<Char>& buf, basic_string_view<Char> format_str,
+           basic_format_args<basic_format_context<
+               std::back_insert_iterator<buffer<type_identity_t<Char>>>,
+               type_identity_t<Char>>>
+               args) {
+  using iterator = std::back_insert_iterator<buffer<char>>;
+  using context = basic_format_context<
+      std::back_insert_iterator<buffer<type_identity_t<Char>>>,
+      type_identity_t<Char>>;
+  auto out = iterator(buf);
+  format_handler<iterator, Char, context> h(out, format_str, args, {});
+  parse_format_string<false>(format_str, h);
+  return out;
+}
+template basic_format_context<std::back_insert_iterator<buffer<char>>,
+                              char>::iterator
+vformat_to(buffer<char>&, string_view,
+           basic_format_args<basic_format_context<
+               std::back_insert_iterator<buffer<type_identity_t<char>>>,
+               type_identity_t<char>>>);
+}  // namespace detail
 
 template struct FMT_INSTANTIATION_DEF_API detail::basic_data<void>;
 
 // Workaround a bug in MSVC2013 that prevents instantiation of format_float.
-int (*instantiate_format_float)(double, int, detail::float_specs, detail::buffer<char> &) = detail::format_float;
+int (*instantiate_format_float)(double, int, detail::float_specs,
+                                detail::buffer<char>&) = detail::format_float;
 
 #ifndef FMT_STATIC_THOUSANDS_SEPARATOR
-template FMT_API detail::locale_ref::locale_ref(const std::locale &loc);
+template FMT_API detail::locale_ref::locale_ref(const std::locale& loc);
 template FMT_API std::locale detail::locale_ref::get<std::locale>() const;
 #endif
 
@@ -41,15 +75,21 @@ template FMT_API std::string detail::grouping_impl<char>(locale_ref);
 template FMT_API char detail::thousands_sep_impl(locale_ref);
 template FMT_API char detail::decimal_point_impl(locale_ref);
 
-template FMT_API void detail::buffer<char>::append(const char *, const char *);
+template FMT_API void detail::buffer<char>::append(const char*, const char*);
 
-template FMT_API FMT_BUFFER_CONTEXT(char)::iterator detail::vformat_to(
+template FMT_API void detail::vformat_to(
-    detail::buffer<char> &, string_view, basic_format_args<FMT_BUFFER_CONTEXT(char)>);
+    detail::buffer<char>&, string_view,
+    basic_format_args<FMT_BUFFER_CONTEXT(char)>, detail::locale_ref);
 
-template FMT_API int detail::snprintf_float(double, int, detail::float_specs, detail::buffer<char> &);
+template FMT_API int detail::snprintf_float(double, int, detail::float_specs,
-template FMT_API int detail::snprintf_float(long double, int, detail::float_specs, detail::buffer<char> &);
+                                            detail::buffer<char>&);
-template FMT_API int detail::format_float(double, int, detail::float_specs, detail::buffer<char> &);
+template FMT_API int detail::snprintf_float(long double, int,
-template FMT_API int detail::format_float(long double, int, detail::float_specs, detail::buffer<char> &);
+                                            detail::float_specs,
+                                            detail::buffer<char>&);
+template FMT_API int detail::format_float(double, int, detail::float_specs,
+                                          detail::buffer<char>&);
+template FMT_API int detail::format_float(long double, int, detail::float_specs,
+                                          detail::buffer<char>&);
 
 // Explicit instantiations for wchar_t.
 
@@ -57,7 +97,7 @@ template FMT_API std::string detail::grouping_impl<wchar_t>(locale_ref);
 template FMT_API wchar_t detail::thousands_sep_impl(locale_ref);
 template FMT_API wchar_t detail::decimal_point_impl(locale_ref);
 
-template FMT_API void detail::buffer<wchar_t>::append(const wchar_t *, const wchar_t *);
+template FMT_API void detail::buffer<wchar_t>::append(const wchar_t*,
+                                                      const wchar_t*);
 FMT_END_NAMESPACE
-
 #endif // !SPDLOG_FMT_EXTERNAL

tests/test_async.cpp

@@ -3,6 +3,8 @@
 #include "spdlog/sinks/basic_file_sink.h"
 #include "test_sink.h"
 
+#define TEST_FILENAME "test_logs/async_test.log"
+
 TEST_CASE("basic async test ", "[async]")
 {
     auto test_sink = std::make_shared<spdlog::sinks::test_sink_mt>();
@@ -87,7 +89,7 @@ TEST_CASE("async periodic flush", "[async]")
     auto test_sink = std::static_pointer_cast<spdlog::sinks::test_sink_mt>(logger->sinks()[0]);
 
     spdlog::flush_every(std::chrono::seconds(1));
-    std::this_thread::sleep_for(std::chrono::milliseconds(1100));
+    std::this_thread::sleep_for(std::chrono::milliseconds(1700));
     REQUIRE(test_sink->flush_counter() == 1);
     spdlog::flush_every(std::chrono::seconds(0));
     spdlog::drop_all();
@@ -149,7 +151,7 @@ TEST_CASE("to_file", "[async]")
     prepare_logdir();
     size_t messages = 1024;
     size_t tp_threads = 1;
-    std::string filename = "test_logs/async_test.log";
+    spdlog::filename_t filename = SPDLOG_FILENAME_T(TEST_FILENAME);
     {
         auto file_sink = std::make_shared<spdlog::sinks::basic_file_sink_mt>(filename, true);
         auto tp = std::make_shared<spdlog::details::thread_pool>(messages, tp_threads);
@@ -161,8 +163,8 @@ TEST_CASE("to_file", "[async]")
         }
     }
 
-    require_message_count(filename, messages);
+    require_message_count(TEST_FILENAME, messages);
-    auto contents = file_contents(filename);
+    auto contents = file_contents(TEST_FILENAME);
     using spdlog::details::os::default_eol;
     REQUIRE(ends_with(contents, fmt::format("Hello message #1023{}", default_eol)));
 }
@@ -172,7 +174,7 @@ TEST_CASE("to_file multi-workers", "[async]")
     prepare_logdir();
     size_t messages = 1024 * 10;
     size_t tp_threads = 10;
-    std::string filename = "test_logs/async_test.log";
+    spdlog::filename_t filename = SPDLOG_FILENAME_T(TEST_FILENAME);
     {
         auto file_sink = std::make_shared<spdlog::sinks::basic_file_sink_mt>(filename, true);
         auto tp = std::make_shared<spdlog::details::thread_pool>(messages, tp_threads);
@@ -184,5 +186,5 @@ TEST_CASE("to_file multi-workers", "[async]")
         }
     }
 
-    require_message_count(filename, messages);
+    require_message_count(TEST_FILENAME, messages);
 }

tests/test_create_dir.cpp

@@ -6,7 +6,7 @@
 using spdlog::details::os::create_dir;
 using spdlog::details::os::path_exists;
 
-bool try_create_dir(const char *path, const char *normalized_path)
+bool try_create_dir(const spdlog::filename_t &path, const spdlog::filename_t &normalized_path)
 {
     auto rv = create_dir(path);
     REQUIRE(rv == true);
@@ -17,24 +17,24 @@ TEST_CASE("create_dir", "[create_dir]")
 {
     prepare_logdir();
 
-    REQUIRE(try_create_dir("test_logs/dir1/dir1", "test_logs/dir1/dir1"));
+    REQUIRE(try_create_dir(SPDLOG_FILENAME_T("test_logs/dir1/dir1"), SPDLOG_FILENAME_T("test_logs/dir1/dir1")));
-    REQUIRE(try_create_dir("test_logs/dir1/dir1", "test_logs/dir1/dir1")); // test existing
+    REQUIRE(try_create_dir(SPDLOG_FILENAME_T("test_logs/dir1/dir1"), SPDLOG_FILENAME_T("test_logs/dir1/dir1"))); // test existing
-    REQUIRE(try_create_dir("test_logs/dir1///dir2//", "test_logs/dir1/dir2"));
+    REQUIRE(try_create_dir(SPDLOG_FILENAME_T("test_logs/dir1///dir2//"), SPDLOG_FILENAME_T("test_logs/dir1/dir2")));
-    REQUIRE(try_create_dir("./test_logs/dir1/dir3", "test_logs/dir1/dir3"));
+    REQUIRE(try_create_dir(SPDLOG_FILENAME_T("./test_logs/dir1/dir3"), SPDLOG_FILENAME_T("test_logs/dir1/dir3")));
-    REQUIRE(try_create_dir("test_logs/../test_logs/dir1/dir4", "test_logs/dir1/dir4"));
+    REQUIRE(try_create_dir(SPDLOG_FILENAME_T("test_logs/../test_logs/dir1/dir4"), SPDLOG_FILENAME_T("test_logs/dir1/dir4")));
 
 #ifdef WIN32
     // test backslash folder separator
-    REQUIRE(try_create_dir("test_logs\\dir1\\dir222", "test_logs\\dir1\\dir222"));
+    REQUIRE(try_create_dir(SPDLOG_FILENAME_T("test_logs\\dir1\\dir222"), SPDLOG_FILENAME_T("test_logs\\dir1\\dir222")));
-    REQUIRE(try_create_dir("test_logs\\dir1\\dir223\\", "test_logs\\dir1\\dir223\\"));
+    REQUIRE(try_create_dir(SPDLOG_FILENAME_T("test_logs\\dir1\\dir223\\"), SPDLOG_FILENAME_T("test_logs\\dir1\\dir223\\")));
-    REQUIRE(try_create_dir(".\\test_logs\\dir1\\dir2\\dir99\\..\\dir23", "test_logs\\dir1\\dir2\\dir23"));
+    REQUIRE(try_create_dir(SPDLOG_FILENAME_T(".\\test_logs\\dir1\\dir2\\dir99\\..\\dir23"), SPDLOG_FILENAME_T("test_logs\\dir1\\dir2\\dir23")));
-    REQUIRE(try_create_dir("test_logs\\..\\test_logs\\dir1\\dir5", "test_logs\\dir1\\dir5"));
+    REQUIRE(try_create_dir(SPDLOG_FILENAME_T("test_logs\\..\\test_logs\\dir1\\dir5"), SPDLOG_FILENAME_T("test_logs\\dir1\\dir5")));
 #endif
 }
 
 TEST_CASE("create_invalid_dir", "[create_dir]")
 {
-    REQUIRE(create_dir("") == false);
+    REQUIRE(create_dir(SPDLOG_FILENAME_T("")) == false);
     REQUIRE(create_dir(spdlog::filename_t{}) == false);
 #ifdef __linux__
     REQUIRE(create_dir("/proc/spdlog-utest") == false);
@@ -44,37 +44,31 @@ TEST_CASE("create_invalid_dir", "[create_dir]")
 TEST_CASE("dir_name", "[create_dir]")
 {
     using spdlog::details::os::dir_name;
-    REQUIRE(dir_name("").empty());
+    REQUIRE(dir_name(SPDLOG_FILENAME_T("")).empty());
-    REQUIRE(dir_name("dir").empty());
+    REQUIRE(dir_name(SPDLOG_FILENAME_T("dir")).empty());
 
 #ifdef WIN32
-    REQUIRE(dir_name(R"(dir\)") == "dir");
+    REQUIRE(dir_name(SPDLOG_FILENAME_T(R"(dir\)")) == SPDLOG_FILENAME_T("dir"));
-    REQUIRE(dir_name(R"(dir\\\)") == R"(dir\\)");
+    REQUIRE(dir_name(SPDLOG_FILENAME_T(R"(dir\\\)")) == SPDLOG_FILENAME_T(R"(dir\\)"));
-    REQUIRE(dir_name(R"(dir\file)") == "dir");
+    REQUIRE(dir_name(SPDLOG_FILENAME_T(R"(dir\file)")) == SPDLOG_FILENAME_T("dir"));
-    REQUIRE(dir_name(R"(dir/file)") == "dir");
+    REQUIRE(dir_name(SPDLOG_FILENAME_T(R"(dir/file)")) == SPDLOG_FILENAME_T("dir"));
-    REQUIRE(dir_name(R"(dir\file.txt)") == "dir");
+    REQUIRE(dir_name(SPDLOG_FILENAME_T(R"(dir\file.txt)")) == SPDLOG_FILENAME_T("dir"));
-    REQUIRE(dir_name(R"(dir/file)") == "dir");
+    REQUIRE(dir_name(SPDLOG_FILENAME_T(R"(dir/file)")) == SPDLOG_FILENAME_T("dir"));
-    REQUIRE(dir_name(R"(dir\file.txt\)") == R"(dir\file.txt)");
+    REQUIRE(dir_name(SPDLOG_FILENAME_T(R"(dir\file.txt\)")) == SPDLOG_FILENAME_T(R"(dir\file.txt)"));
-    REQUIRE(dir_name(R"(dir/file.txt/)") == R"(dir\file.txt)");
+    REQUIRE(dir_name(SPDLOG_FILENAME_T(R"(\dir\file.txt)")) == SPDLOG_FILENAME_T(R"(\dir)"));
-    REQUIRE(dir_name(R"(\dir\file.txt)") == R"(\dir)");
+    REQUIRE(dir_name(SPDLOG_FILENAME_T(R"(\\dir\file.txt)")) == SPDLOG_FILENAME_T(R"(\\dir)"));
-    REQUIRE(dir_name(R"(/dir/file.txt)") == R"(\dir)");
+    REQUIRE(dir_name(SPDLOG_FILENAME_T(R"(..\file.txt)")) == SPDLOG_FILENAME_T(".."));
-    REQUIRE(dir_name(R"(\\dir\file.txt)") == R"(\\dir)");
+    REQUIRE(dir_name(SPDLOG_FILENAME_T(R"(.\file.txt)")) == SPDLOG_FILENAME_T("."));
-    REQUIRE(dir_name(R"(//dir/file.txt)") == R"(\\dir)");
+    REQUIRE(dir_name(SPDLOG_FILENAME_T(R"(c:\\a\b\c\d\file.txt)")) == SPDLOG_FILENAME_T(R"(c:\\a\b\c\d)"));
-    REQUIRE(dir_name(R"(..\file.txt)") == "..");
+    REQUIRE(dir_name(SPDLOG_FILENAME_T(R"(c://a/b/c/d/file.txt)")) == SPDLOG_FILENAME_T(R"(c://a/b/c/d)"));
-    REQUIRE(dir_name(R"(../file.txt)") == "..");
-    REQUIRE(dir_name(R"(.\file.txt)") == ".");
-    REQUIRE(dir_name(R"(./file.txt)") == ".");
-    REQUIRE(dir_name(R"(c:\\a\b\c\d\file.txt)") == R"(c:\\a\b\c\d)");
-    REQUIRE(dir_name(R"(c://a/b/c/d/file.txt)") == R"(c:\\a\b\c\d)");
-#else
-    REQUIRE(dir_name("dir/") == "dir");
-    REQUIRE(dir_name("dir///") == "dir//");
-    REQUIRE(dir_name("dir/file") == "dir");
-    REQUIRE(dir_name("dir/file.txt") == "dir");
-    REQUIRE(dir_name("dir/file.txt/") == "dir/file.txt");
-    REQUIRE(dir_name("/dir/file.txt") == "/dir");
-    REQUIRE(dir_name("//dir/file.txt") == "//dir");
-    REQUIRE(dir_name("../file.txt") == "..");
-    REQUIRE(dir_name("./file.txt") == ".");
 #endif
+    REQUIRE(dir_name(SPDLOG_FILENAME_T("dir/")) == SPDLOG_FILENAME_T("dir"));
+    REQUIRE(dir_name(SPDLOG_FILENAME_T("dir///")) == SPDLOG_FILENAME_T("dir//"));
+    REQUIRE(dir_name(SPDLOG_FILENAME_T("dir/file")) == SPDLOG_FILENAME_T("dir"));
+    REQUIRE(dir_name(SPDLOG_FILENAME_T("dir/file.txt")) == SPDLOG_FILENAME_T("dir"));
+    REQUIRE(dir_name(SPDLOG_FILENAME_T("dir/file.txt/")) == SPDLOG_FILENAME_T("dir/file.txt"));
+    REQUIRE(dir_name(SPDLOG_FILENAME_T("/dir/file.txt")) == SPDLOG_FILENAME_T("/dir"));
+    REQUIRE(dir_name(SPDLOG_FILENAME_T("//dir/file.txt")) == SPDLOG_FILENAME_T("//dir"));
+    REQUIRE(dir_name(SPDLOG_FILENAME_T("../file.txt")) == SPDLOG_FILENAME_T(".."));
+    REQUIRE(dir_name(SPDLOG_FILENAME_T("./file.txt")) == SPDLOG_FILENAME_T("."));
 }

tests/test_daily_logger.cpp

@@ -3,6 +3,8 @@
  */
 #include "includes.h"
 
+using filename_memory_buf_t = fmt::basic_memory_buffer<spdlog::filename_t::value_type, 250>;
+
 TEST_CASE("daily_logger with dateonly calculator", "[daily_logger]")
 {
     using sink_type = spdlog::sinks::daily_file_sink<std::mutex, spdlog::sinks::daily_filename_calculator>;
@@ -10,10 +12,10 @@ TEST_CASE("daily_logger with dateonly calculator", "[daily_logger]")
     prepare_logdir();
 
     // calculate filename (time based)
-    std::string basename = "test_logs/daily_dateonly";
+    spdlog::filename_t basename = SPDLOG_FILENAME_T("test_logs/daily_dateonly");
     std::tm tm = spdlog::details::os::localtime();
-    spdlog::memory_buf_t w;
+    filename_memory_buf_t w;
-    fmt::format_to(w, "{}_{:04d}-{:02d}-{:02d}", basename, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
+    fmt::format_to(w, SPDLOG_FILENAME_T("{}_{:04d}-{:02d}-{:02d}"), basename, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
 
     auto logger = spdlog::create<sink_type>("logger", basename, 0, 0);
     for (int i = 0; i < 10; ++i)
@@ -23,7 +25,13 @@ TEST_CASE("daily_logger with dateonly calculator", "[daily_logger]")
     }
     logger->flush();
 
+#ifdef SPDLOG_WCHAR_FILENAMES
+    spdlog::memory_buf_t buf;
+    spdlog::details::os::wstr_to_utf8buf(fmt::to_string(w), buf);
+    auto filename = fmt::to_string(buf);
+#else
     auto filename = fmt::to_string(w);
+#endif
     require_message_count(filename, 10);
 }
 
@@ -31,8 +39,8 @@ struct custom_daily_file_name_calculator
 {
     static spdlog::filename_t calc_filename(const spdlog::filename_t &basename, const tm &now_tm)
     {
-        spdlog::memory_buf_t w;
+        filename_memory_buf_t w;
-        fmt::format_to(w, "{}{:04d}{:02d}{:02d}", basename, now_tm.tm_year + 1900, now_tm.tm_mon + 1, now_tm.tm_mday);
+        fmt::format_to(w, SPDLOG_FILENAME_T("{}{:04d}{:02d}{:02d}"), basename, now_tm.tm_year + 1900, now_tm.tm_mon + 1, now_tm.tm_mday);
         return fmt::to_string(w);
     }
 };
@@ -44,10 +52,10 @@ TEST_CASE("daily_logger with custom calculator", "[daily_logger]")
     prepare_logdir();
 
     // calculate filename (time based)
-    std::string basename = "test_logs/daily_dateonly";
+    spdlog::filename_t basename = SPDLOG_FILENAME_T("test_logs/daily_dateonly");
     std::tm tm = spdlog::details::os::localtime();
-    spdlog::memory_buf_t w;
+    filename_memory_buf_t w;
-    fmt::format_to(w, "{}{:04d}{:02d}{:02d}", basename, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
+    fmt::format_to(w, SPDLOG_FILENAME_T("{}{:04d}{:02d}{:02d}"), basename, tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
 
     auto logger = spdlog::create<sink_type>("logger", basename, 0, 0);
     for (int i = 0; i < 10; ++i)
@@ -57,7 +65,13 @@ TEST_CASE("daily_logger with custom calculator", "[daily_logger]")
 
     logger->flush();
 
+#ifdef SPDLOG_WCHAR_FILENAMES
+    spdlog::memory_buf_t buf;
+    spdlog::details::os::wstr_to_utf8buf(fmt::to_string(w), buf);
+    auto filename = fmt::to_string(buf);
+#else
     auto filename = fmt::to_string(w);
+#endif
     require_message_count(filename, 10);
 }
 
@@ -67,20 +81,20 @@ TEST_CASE("daily_logger with custom calculator", "[daily_logger]")
 
 TEST_CASE("rotating_file_sink::calc_filename1", "[rotating_file_sink]]")
 {
-    auto filename = spdlog::sinks::rotating_file_sink_st::calc_filename("rotated.txt", 3);
+    auto filename = spdlog::sinks::rotating_file_sink_st::calc_filename(SPDLOG_FILENAME_T("rotated.txt"), 3);
-    REQUIRE(filename == "rotated.3.txt");
+    REQUIRE(filename == SPDLOG_FILENAME_T("rotated.3.txt"));
 }
 
 TEST_CASE("rotating_file_sink::calc_filename2", "[rotating_file_sink]]")
 {
-    auto filename = spdlog::sinks::rotating_file_sink_st::calc_filename("rotated", 3);
+    auto filename = spdlog::sinks::rotating_file_sink_st::calc_filename(SPDLOG_FILENAME_T("rotated"), 3);
-    REQUIRE(filename == "rotated.3");
+    REQUIRE(filename == SPDLOG_FILENAME_T("rotated.3"));
 }
 
 TEST_CASE("rotating_file_sink::calc_filename3", "[rotating_file_sink]]")
 {
-    auto filename = spdlog::sinks::rotating_file_sink_st::calc_filename("rotated.txt", 0);
+    auto filename = spdlog::sinks::rotating_file_sink_st::calc_filename(SPDLOG_FILENAME_T("rotated.txt"), 0);
-    REQUIRE(filename == "rotated.txt");
+    REQUIRE(filename == SPDLOG_FILENAME_T("rotated.txt"));
 }
 
 // regex supported only from gcc 4.9 and above
@@ -91,10 +105,10 @@ TEST_CASE("rotating_file_sink::calc_filename3", "[rotating_file_sink]]")
 TEST_CASE("daily_file_sink::daily_filename_calculator", "[daily_file_sink]]")
 {
     // daily_YYYY-MM-DD_hh-mm.txt
-    auto filename = spdlog::sinks::daily_filename_calculator::calc_filename("daily.txt", spdlog::details::os::localtime());
+    auto filename = spdlog::sinks::daily_filename_calculator::calc_filename(SPDLOG_FILENAME_T("daily.txt"), spdlog::details::os::localtime());
     // date regex based on https://www.regular-expressions.info/dates.html
-    std::regex re(R"(^daily_(19|20)\d\d-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])\.txt$)");
+    std::basic_regex<spdlog::filename_t::value_type> re(SPDLOG_FILENAME_T(R"(^daily_(19|20)\d\d-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])\.txt$)"));
-    std::smatch match;
+    std::match_results<spdlog::filename_t::const_iterator> match;
     REQUIRE(std::regex_match(filename, match, re));
 }
 #endif
@@ -116,7 +130,7 @@ static void test_rotate(int days_to_run, uint16_t max_days, uint16_t expected_n_
 
     prepare_logdir();
 
-    std::string basename = "test_logs/daily_rotate.txt";
+    spdlog::filename_t basename = SPDLOG_FILENAME_T("test_logs/daily_rotate.txt");
     daily_file_sink_st sink{basename, 2, 30, true, max_days};
 
     // simulate messages with 24 intervals

tests/test_errors.cpp

@@ -5,6 +5,9 @@
 
 #include <iostream>
 
+#define SIMPLE_LOG "test_logs/simple_log.txt"
+#define SIMPLE_ASYNC_LOG "test_logs/simple_async_log.txt"
+
 class failing_sink : public spdlog::sinks::base_sink<std::mutex>
 {
 protected:
@@ -22,7 +25,7 @@ protected:
 TEST_CASE("default_error_handler", "[errors]]")
 {
     prepare_logdir();
-    std::string filename = "test_logs/simple_log.txt";
+    spdlog::filename_t filename = SPDLOG_FILENAME_T(SIMPLE_LOG);
 
     auto logger = spdlog::create<spdlog::sinks::basic_file_sink_mt>("test-error", filename, true);
     logger->set_pattern("%v");
@@ -31,8 +34,8 @@ TEST_CASE("default_error_handler", "[errors]]")
     logger->flush();
 
     using spdlog::details::os::default_eol;
-    REQUIRE(file_contents(filename) == fmt::format("Test message 2{}", default_eol));
+    REQUIRE(file_contents(SIMPLE_LOG) == fmt::format("Test message 2{}", default_eol));
-    REQUIRE(count_lines(filename) == 1);
+    REQUIRE(count_lines(SIMPLE_LOG) == 1);
 }
 
 struct custom_ex
@@ -40,7 +43,7 @@ struct custom_ex
 TEST_CASE("custom_error_handler", "[errors]]")
 {
     prepare_logdir();
-    std::string filename = "test_logs/simple_log.txt";
+    spdlog::filename_t filename = SPDLOG_FILENAME_T(SIMPLE_LOG);
     auto logger = spdlog::create<spdlog::sinks::basic_file_sink_mt>("logger", filename, true);
     logger->flush_on(spdlog::level::info);
     logger->set_error_handler([=](const std::string &) { throw custom_ex(); });
@@ -48,7 +51,7 @@ TEST_CASE("custom_error_handler", "[errors]]")
 
     REQUIRE_THROWS_AS(logger->info("Bad format msg {} {}", "xxx"), custom_ex);
     logger->info("Good message #2");
-    require_message_count(filename, 2);
+    require_message_count(SIMPLE_LOG, 2);
 }
 
 TEST_CASE("default_error_handler2", "[errors]]")
@@ -72,7 +75,7 @@ TEST_CASE("async_error_handler", "[errors]]")
     prepare_logdir();
     std::string err_msg("log failed with some msg");
 
-    std::string filename = "test_logs/simple_async_log.txt";
+    spdlog::filename_t filename = SPDLOG_FILENAME_T(SIMPLE_ASYNC_LOG);
     {
         spdlog::init_thread_pool(128, 1);
         auto logger = spdlog::create_async<spdlog::sinks::basic_file_sink_mt>("logger", filename, true);
@@ -90,7 +93,7 @@ TEST_CASE("async_error_handler", "[errors]]")
         spdlog::drop("logger"); // force logger to drain the queue and shutdown
     }
     spdlog::init_thread_pool(128, 1);
-    require_message_count(filename, 2);
+    require_message_count(SIMPLE_ASYNC_LOG, 2);
     REQUIRE(file_contents("test_logs/custom_err.txt") == err_msg);
 }
 
@@ -100,7 +103,7 @@ TEST_CASE("async_error_handler2", "[errors]]")
     prepare_logdir();
     std::string err_msg("This is async handler error message");
     {
-        spdlog::details::os::create_dir("test_logs");
+        spdlog::details::os::create_dir(SPDLOG_FILENAME_T("test_logs"));
         spdlog::init_thread_pool(128, 1);
         auto logger = spdlog::create_async<failing_sink>("failed_logger");
         logger->set_error_handler([=](const std::string &) {

tests/test_eventlog.cpp

@@ -24,20 +24,20 @@ static void test_single_print(std::function<void(std::string const &)> do_log, s
                 REQUIRE(CloseEventLog(handle_));
             }
         }
-    } event_log{::OpenEventLog(nullptr, TEST_SOURCE)};
+    } event_log{::OpenEventLogA(nullptr, TEST_SOURCE)};
 
     REQUIRE(event_log.handle_);
 
     DWORD read_bytes{}, size_needed{};
     auto ok =
-        ::ReadEventLog(event_log.handle_, EVENTLOG_SEQUENTIAL_READ | EVENTLOG_BACKWARDS_READ, 0, &read_bytes, 0, &read_bytes, &size_needed);
+        ::ReadEventLogA(event_log.handle_, EVENTLOG_SEQUENTIAL_READ | EVENTLOG_BACKWARDS_READ, 0, &read_bytes, 0, &read_bytes, &size_needed);
     REQUIRE(!ok);
     REQUIRE(::GetLastError() == ERROR_INSUFFICIENT_BUFFER);
 
     std::vector<char> record_buffer(size_needed);
     PEVENTLOGRECORD record = (PEVENTLOGRECORD)record_buffer.data();
 
-    ok = ::ReadEventLog(
+    ok = ::ReadEventLogA(
         event_log.handle_, EVENTLOG_SEQUENTIAL_READ | EVENTLOG_BACKWARDS_READ, 0, record, size_needed, &read_bytes, &size_needed);
     REQUIRE(ok);
 

tests/test_file_helper.cpp

@@ -3,6 +3,8 @@
  */
 #include "includes.h"
 
+#define TEST_FILENAME "test_logs/file_helper_test.txt"
+
 using spdlog::details::file_helper;
 
 static void write_with_helper(file_helper &helper, size_t howmany)
@@ -18,7 +20,7 @@ TEST_CASE("file_helper_filename", "[file_helper::filename()]]")
     prepare_logdir();
 
     file_helper helper;
-    std::string target_filename = "test_logs/file_helper_test.txt";
+    spdlog::filename_t target_filename = SPDLOG_FILENAME_T(TEST_FILENAME);
     helper.open(target_filename);
     REQUIRE(helper.filename() == target_filename);
 }
@@ -26,7 +28,7 @@ TEST_CASE("file_helper_filename", "[file_helper::filename()]]")
 TEST_CASE("file_helper_size", "[file_helper::size()]]")
 {
     prepare_logdir();
-    std::string target_filename = "test_logs/file_helper_test.txt";
+    spdlog::filename_t target_filename = SPDLOG_FILENAME_T(TEST_FILENAME);
     size_t expected_size = 123;
     {
         file_helper helper;
@@ -34,13 +36,13 @@ TEST_CASE("file_helper_size", "[file_helper::size()]]")
         write_with_helper(helper, expected_size);
         REQUIRE(static_cast<size_t>(helper.size()) == expected_size);
     }
-    REQUIRE(get_filesize(target_filename) == expected_size);
+    REQUIRE(get_filesize(TEST_FILENAME) == expected_size);
 }
 
 TEST_CASE("file_helper_reopen", "[file_helper::reopen()]]")
 {
     prepare_logdir();
-    std::string target_filename = "test_logs/file_helper_test.txt";
+    spdlog::filename_t target_filename = SPDLOG_FILENAME_T(TEST_FILENAME);
     file_helper helper;
     helper.open(target_filename);
     write_with_helper(helper, 12);
@@ -52,7 +54,7 @@ TEST_CASE("file_helper_reopen", "[file_helper::reopen()]]")
 TEST_CASE("file_helper_reopen2", "[file_helper::reopen(false)]]")
 {
     prepare_logdir();
-    std::string target_filename = "test_logs/file_helper_test.txt";
+    spdlog::filename_t target_filename = SPDLOG_FILENAME_T(TEST_FILENAME);
     size_t expected_size = 14;
     file_helper helper;
     helper.open(target_filename);
@@ -62,16 +64,12 @@ TEST_CASE("file_helper_reopen2", "[file_helper::reopen(false)]]")
     REQUIRE(helper.size() == expected_size);
 }
 
-static void test_split_ext(const char *fname, const char *expect_base, const char *expect_ext)
+static void test_split_ext(const spdlog::filename_t::value_type *fname, const spdlog::filename_t::value_type *expect_base, const spdlog::filename_t::value_type *expect_ext)
 {
     spdlog::filename_t filename(fname);
     spdlog::filename_t expected_base(expect_base);
     spdlog::filename_t expected_ext(expect_ext);
 
-#ifdef _WIN32 // replace folder sep
-    std::replace(filename.begin(), filename.end(), '/', '\\');
-    std::replace(expected_base.begin(), expected_base.end(), '/', '\\');
-#endif
     spdlog::filename_t basename;
     spdlog::filename_t ext;
     std::tie(basename, ext) = file_helper::split_by_extension(filename);
@@ -81,22 +79,22 @@ static void test_split_ext(const char *fname, const char *expect_base, const cha
 
 TEST_CASE("file_helper_split_by_extension", "[file_helper::split_by_extension()]]")
 {
-    test_split_ext("mylog.txt", "mylog", ".txt");
+    test_split_ext(SPDLOG_FILENAME_T("mylog.txt"), SPDLOG_FILENAME_T("mylog"), SPDLOG_FILENAME_T(".txt"));
-    test_split_ext(".mylog.txt", ".mylog", ".txt");
+    test_split_ext(SPDLOG_FILENAME_T(".mylog.txt"), SPDLOG_FILENAME_T(".mylog"), SPDLOG_FILENAME_T(".txt"));
-    test_split_ext(".mylog", ".mylog", "");
+    test_split_ext(SPDLOG_FILENAME_T(".mylog"), SPDLOG_FILENAME_T(".mylog"), SPDLOG_FILENAME_T(""));
-    test_split_ext("/aaa/bb.d/mylog", "/aaa/bb.d/mylog", "");
+    test_split_ext(SPDLOG_FILENAME_T("/aaa/bb.d/mylog"), SPDLOG_FILENAME_T("/aaa/bb.d/mylog"), SPDLOG_FILENAME_T(""));
-    test_split_ext("/aaa/bb.d/mylog.txt", "/aaa/bb.d/mylog", ".txt");
+    test_split_ext(SPDLOG_FILENAME_T("/aaa/bb.d/mylog.txt"), SPDLOG_FILENAME_T("/aaa/bb.d/mylog"), SPDLOG_FILENAME_T(".txt"));
-    test_split_ext("aaa/bbb/ccc/mylog.txt", "aaa/bbb/ccc/mylog", ".txt");
+    test_split_ext(SPDLOG_FILENAME_T("aaa/bbb/ccc/mylog.txt"), SPDLOG_FILENAME_T("aaa/bbb/ccc/mylog"), SPDLOG_FILENAME_T(".txt"));
-    test_split_ext("aaa/bbb/ccc/mylog.", "aaa/bbb/ccc/mylog.", "");
+    test_split_ext(SPDLOG_FILENAME_T("aaa/bbb/ccc/mylog."), SPDLOG_FILENAME_T("aaa/bbb/ccc/mylog."), SPDLOG_FILENAME_T(""));
-    test_split_ext("aaa/bbb/ccc/.mylog.txt", "aaa/bbb/ccc/.mylog", ".txt");
+    test_split_ext(SPDLOG_FILENAME_T("aaa/bbb/ccc/.mylog.txt"), SPDLOG_FILENAME_T("aaa/bbb/ccc/.mylog"), SPDLOG_FILENAME_T(".txt"));
-    test_split_ext("/aaa/bbb/ccc/mylog.txt", "/aaa/bbb/ccc/mylog", ".txt");
+    test_split_ext(SPDLOG_FILENAME_T("/aaa/bbb/ccc/mylog.txt"), SPDLOG_FILENAME_T("/aaa/bbb/ccc/mylog"), SPDLOG_FILENAME_T(".txt"));
-    test_split_ext("/aaa/bbb/ccc/.mylog", "/aaa/bbb/ccc/.mylog", "");
+    test_split_ext(SPDLOG_FILENAME_T("/aaa/bbb/ccc/.mylog"), SPDLOG_FILENAME_T("/aaa/bbb/ccc/.mylog"), SPDLOG_FILENAME_T(""));
-    test_split_ext("../mylog.txt", "../mylog", ".txt");
+    test_split_ext(SPDLOG_FILENAME_T("../mylog.txt"), SPDLOG_FILENAME_T("../mylog"), SPDLOG_FILENAME_T(".txt"));
-    test_split_ext(".././mylog.txt", ".././mylog", ".txt");
+    test_split_ext(SPDLOG_FILENAME_T(".././mylog.txt"), SPDLOG_FILENAME_T(".././mylog"), SPDLOG_FILENAME_T(".txt"));
-    test_split_ext(".././mylog.txt/xxx", ".././mylog.txt/xxx", "");
+    test_split_ext(SPDLOG_FILENAME_T(".././mylog.txt/xxx"), SPDLOG_FILENAME_T(".././mylog.txt/xxx"), SPDLOG_FILENAME_T(""));
-    test_split_ext("/mylog.txt", "/mylog", ".txt");
+    test_split_ext(SPDLOG_FILENAME_T("/mylog.txt"), SPDLOG_FILENAME_T("/mylog"), SPDLOG_FILENAME_T(".txt"));
-    test_split_ext("//mylog.txt", "//mylog", ".txt");
+    test_split_ext(SPDLOG_FILENAME_T("//mylog.txt"), SPDLOG_FILENAME_T("//mylog"), SPDLOG_FILENAME_T(".txt"));
-    test_split_ext("", "", "");
+    test_split_ext(SPDLOG_FILENAME_T(""), SPDLOG_FILENAME_T(""), SPDLOG_FILENAME_T(""));
-    test_split_ext(".", ".", "");
+    test_split_ext(SPDLOG_FILENAME_T("."), SPDLOG_FILENAME_T("."), SPDLOG_FILENAME_T(""));
-    test_split_ext("..txt", ".", ".txt");
+    test_split_ext(SPDLOG_FILENAME_T("..txt"), SPDLOG_FILENAME_T("."), SPDLOG_FILENAME_T(".txt"));
 }

tests/test_file_logging.cpp

@@ -3,10 +3,13 @@
  */
 #include "includes.h"
 
+#define SIMPLE_LOG "test_logs/simple_log"
+#define ROTATING_LOG "test_logs/rotating_log"
+
 TEST_CASE("simple_file_logger", "[simple_logger]]")
 {
     prepare_logdir();
-    std::string filename = "test_logs/simple_log";
+    spdlog::filename_t filename = SPDLOG_FILENAME_T(SIMPLE_LOG);
 
     auto logger = spdlog::create<spdlog::sinks::basic_file_sink_mt>("logger", filename);
     logger->set_pattern("%v");
@@ -15,29 +18,29 @@ TEST_CASE("simple_file_logger", "[simple_logger]]")
     logger->info("Test message {}", 2);
 
     logger->flush();
-    require_message_count(filename, 2);
+    require_message_count(SIMPLE_LOG, 2);
     using spdlog::details::os::default_eol;
-    REQUIRE(file_contents(filename) == fmt::format("Test message 1{}Test message 2{}", default_eol, default_eol));
+    REQUIRE(file_contents(SIMPLE_LOG) == fmt::format("Test message 1{}Test message 2{}", default_eol, default_eol));
 }
 
 TEST_CASE("flush_on", "[flush_on]]")
 {
     prepare_logdir();
-    std::string filename = "test_logs/simple_log";
+    spdlog::filename_t filename = SPDLOG_FILENAME_T(SIMPLE_LOG);
 
     auto logger = spdlog::create<spdlog::sinks::basic_file_sink_mt>("logger", filename);
     logger->set_pattern("%v");
     logger->set_level(spdlog::level::trace);
     logger->flush_on(spdlog::level::info);
     logger->trace("Should not be flushed");
-    REQUIRE(count_lines(filename) == 0);
+    REQUIRE(count_lines(SIMPLE_LOG) == 0);
 
     logger->info("Test message {}", 1);
     logger->info("Test message {}", 2);
 
-    require_message_count(filename, 3);
+    require_message_count(SIMPLE_LOG, 3);
     using spdlog::details::os::default_eol;
-    REQUIRE(file_contents(filename) ==
+    REQUIRE(file_contents(SIMPLE_LOG) ==
             fmt::format("Should not be flushed{}Test message 1{}Test message 2{}", default_eol, default_eol, default_eol));
 }
 
@@ -45,7 +48,7 @@ TEST_CASE("rotating_file_logger1", "[rotating_logger]]")
 {
     prepare_logdir();
     size_t max_size = 1024 * 10;
-    std::string basename = "test_logs/rotating_log";
+    spdlog::filename_t basename = SPDLOG_FILENAME_T(ROTATING_LOG);
     auto logger = spdlog::rotating_logger_mt("logger", basename, max_size, 0);
 
     for (int i = 0; i < 10; ++i)
@@ -54,14 +57,14 @@ TEST_CASE("rotating_file_logger1", "[rotating_logger]]")
     }
 
     logger->flush();
-    require_message_count(basename, 10);
+    require_message_count(ROTATING_LOG, 10);
 }
 
 TEST_CASE("rotating_file_logger2", "[rotating_logger]]")
 {
     prepare_logdir();
     size_t max_size = 1024 * 10;
-    std::string basename = "test_logs/rotating_log";
+    spdlog::filename_t basename = SPDLOG_FILENAME_T(ROTATING_LOG);
 
     {
         // make an initial logger to create the first output file
@@ -83,7 +86,7 @@ TEST_CASE("rotating_file_logger2", "[rotating_logger]]")
 
     logger->flush();
 
-    require_message_count(basename, 10);
+    require_message_count(ROTATING_LOG, 10);
 
     for (int i = 0; i < 1000; i++)
     {
@@ -92,7 +95,6 @@ TEST_CASE("rotating_file_logger2", "[rotating_logger]]")
     }
 
     logger->flush();
-    REQUIRE(get_filesize(basename) <= max_size);
+    REQUIRE(get_filesize(ROTATING_LOG) <= max_size);
-    auto filename1 = basename + ".1";
+    REQUIRE(get_filesize(ROTATING_LOG ".1") <= max_size);
-    REQUIRE(get_filesize(filename1) <= max_size);
 }

tests/test_macros.cpp

@@ -8,11 +8,13 @@
 #error "Invalid SPDLOG_ACTIVE_LEVEL in test. Should be SPDLOG_LEVEL_DEBUG"
 #endif
 
+#define TEST_FILENAME "test_logs/simple_log"
+
 TEST_CASE("debug and trace w/o format string", "[macros]]")
 {
 
     prepare_logdir();
-    std::string filename = "test_logs/simple_log";
+    spdlog::filename_t filename = SPDLOG_FILENAME_T(TEST_FILENAME);
 
     auto logger = spdlog::create<spdlog::sinks::basic_file_sink_mt>("logger", filename);
     logger->set_pattern("%v");
@@ -23,8 +25,8 @@ TEST_CASE("debug and trace w/o format string", "[macros]]")
     logger->flush();
 
     using spdlog::details::os::default_eol;
-    REQUIRE(ends_with(file_contents(filename), fmt::format("Test message 2{}", default_eol)));
+    REQUIRE(ends_with(file_contents(TEST_FILENAME), fmt::format("Test message 2{}", default_eol)));
-    REQUIRE(count_lines(filename) == 1);
+    REQUIRE(count_lines(TEST_FILENAME) == 1);
 
     spdlog::set_default_logger(logger);
 
@@ -32,8 +34,8 @@ TEST_CASE("debug and trace w/o format string", "[macros]]")
     SPDLOG_DEBUG("Test message {}", 4);
     logger->flush();
 
-    require_message_count(filename, 2);
+    require_message_count(TEST_FILENAME, 2);
-    REQUIRE(ends_with(file_contents(filename), fmt::format("Test message 4{}", default_eol)));
+    REQUIRE(ends_with(file_contents(TEST_FILENAME), fmt::format("Test message 4{}", default_eol)));
 }
 
 TEST_CASE("disable param evaluation", "[macros]")

tests/test_misc.cpp

@@ -55,6 +55,14 @@ TEST_CASE("level_to_string_view", "[convert_to_string_view")
     REQUIRE(spdlog::level::to_string_view(spdlog::level::off) == "off");
 }
 
+TEST_CASE("set_level_to_string_view", "[set_string_view")
+{
+    spdlog::level::set_string_view(spdlog::level::info, "INF");
+    REQUIRE(spdlog::level::to_string_view(spdlog::level::info) == "INF");
+    spdlog::level::set_string_view(spdlog::level::info, "info"); // set it back
+    REQUIRE(spdlog::level::to_string_view(spdlog::level::info) == "info");
+}
+
 TEST_CASE("to_short_c_str", "[convert_to_short_c_str]")
 {
     REQUIRE(std::string(spdlog::level::to_short_c_str(spdlog::level::trace)) == "T");

tests/test_pattern_formatter.cpp

@@ -372,7 +372,7 @@ TEST_CASE("clone-custom_formatter", "[pattern_formatter]")
 //
 
 #ifdef _WIN32
-static const char *const test_path = "\\a\\b\\myfile.cpp";
+static const char *const test_path = "\\a\\b\\c/myfile.cpp";
 #else
 static const char *const test_path = "/a/b//myfile.cpp";
 #endif

tests/test_registry.cpp

@@ -103,7 +103,7 @@ TEST_CASE("disable automatic registration", "[registry]")
     spdlog::set_level(log_level);
     // but disable automatic registration
     spdlog::set_automatic_registration(false);
-    auto logger1 = spdlog::create<spdlog::sinks::daily_file_sink_st>(tested_logger_name, "filename", 11, 59);
+    auto logger1 = spdlog::create<spdlog::sinks::daily_file_sink_st>(tested_logger_name, SPDLOG_FILENAME_T("filename"), 11, 59);
     auto logger2 = spdlog::create_async<spdlog::sinks::stdout_color_sink_mt>(tested_logger_name2);
     // loggers should not be part of the registry
     REQUIRE_FALSE(spdlog::get(tested_logger_name));

tests/utils.cpp

@@ -1,6 +1,8 @@
 #include "includes.h"
 
-#ifndef _WIN32
+#ifdef _WIN32
+#include <Windows.h>
+#else
 #include <sys/types.h>
 #include <dirent.h>
 #endif
@@ -82,7 +84,7 @@ bool ends_with(std::string const &value, std::string const &ending)
 std::size_t count_files(const std::string &folder)
 {
     size_t counter = 0;
-    WIN32_FIND_DATA ffd;
+    WIN32_FIND_DATAA ffd;
 
     // Start iterating over the files in the folder directory.
     HANDLE hFind = ::FindFirstFileA((folder + "\\*").c_str(), &ffd);
@@ -92,7 +94,7 @@ std::size_t count_files(const std::string &folder)
         {
             if (ffd.cFileName[0] != '.')
                 counter++;
-        } while (::FindNextFile(hFind, &ffd) != 0);
+        } while (::FindNextFileA(hFind, &ffd) != 0);
         ::FindClose(hFind);
     }
     else