windows 下使用 snprintf

#include <stdio.h>#include <stdarg.h>#ifdef _MSC_VER#define snprintf c99_snprintfinline int c99_vsnprintf(char* str, size_t size, const char* format, va_list ap){int count = -1;if (size != 0)count = _vsnprintf_s(str, size, _TRUNCATE, format, ap);if (count == -1)count = _vscprintf(format, ap);return count;}inline int c99_snprintf(char* str, size_t size, const char* format, ...){int count;va_list ap;va_start(ap, format);count = c99_vsnprintf(str, size, format, ap);va_end(ap);return count;}#endif // _MSC_VER

ref:  http://stackoverflow.com/questions/2915672/snprintf-and-visual-studio-2010