1. renamed lib to to spitlog

2. Rotating bugfix

include/spitlog/details/stack_buf.h

@@ -0,0 +1,111 @@
+#pragma once
+
+#include <algorithm>
+#include <array>
+#include <vector>
+#include <cstring>
+
+
+// Fast memory storage on the stack when possible or in std::vector
+namespace spitlog
+{
+namespace details
+{
+
+template<unsigned short STACK_SIZE>
+class stack_buf
+{
+public:
+    static const unsigned short stack_size = STACK_SIZE;
+    stack_buf() :_v(), _stack_size(0) {}
+    ~stack_buf() = default;
+    stack_buf(const stack_buf& other):stack_buf(other, delegate_copy_move {})
+    {}
+
+    stack_buf(stack_buf&& other):stack_buf(other, delegate_copy_move {})
+    {
+        other.clear();
+    }
+    template<class T1>
+    stack_buf& operator=(T1&& other)
+    {
+        _stack_size = other._stack_size;
+        if (other.vector_used())
+            _v = std::forward<T1>(other)._v;
+        else
+            std::copy_n(other._stack_array.begin(), other._stack_size, _stack_array.begin());
+        return *this;
+    }
+
+    void append(const char* buf, std::size_t buf_size)
+    {
+        //If we are aleady using _v, forget about the stack
+        if (vector_used())
+        {
+            _v.insert(_v.end(), buf, buf + buf_size);
+        }
+        //Try use the stack
+        else
+        {
+            if (_stack_size + buf_size <= STACK_SIZE)
+            {
+                std::memcpy(&_stack_array[_stack_size], buf, buf_size);
+                _stack_size += buf_size;
+            }
+            //Not enough stack space. Copy all to _v
+            else
+            {
+                _v.reserve(_stack_size + buf_size);
+                _v.insert(_v.end(), _stack_array.begin(), _stack_array.begin() + _stack_size);
+                _v.insert(_v.end(), buf, buf + buf_size);
+            }
+        }
+    }
+
+
+    void clear()
+    {
+        _stack_size = 0;
+        _v.clear();
+    }
+
+    const char* data() const
+    {
+        if (vector_used())
+            return _v.data();
+        else
+            return _stack_array.data();
+    }
+
+    std::size_t size() const
+    {
+        if (vector_used())
+            return _v.size();
+        else
+            return _stack_size;
+    }
+
+private:
+    struct delegate_copy_move {};
+    template<class T1>
+    stack_buf(T1&& other, delegate_copy_move)
+    {
+        _stack_size = other._stack_size;
+        if (other.vector_used())
+            _v = std::forward<T1>(other)._v;
+        else
+            std::copy_n(other._stack_array.begin(), other._stack_size, _stack_array.begin());
+    }
+
+    inline bool vector_used() const
+    {
+        return !(_v.empty());
+    }
+
+    std::vector<char> _v;
+    std::array<char, STACK_SIZE> _stack_array;
+    std::size_t _stack_size;
+};
+
+}
+} //namespace spitlog { namespace details {