C++ 安全字符串拼接

 #include <stdio.h>
 #include <stdint.h>
 #include <stdarg.h>

 #if defined(__GNUC__)
 #endif

 #if defined(_MSC_VER)
 #define snprintf(buf,size,fmt,...) sprintf_s(buf,size,fmt,__VA_ARGS__)
 #define vsnprintf(buf,size,fmt,...) vsprintf_s(buf,size,fmt,__VA_ARGS__)
 #endif

 #define STRAPPEND(buf, size, offset, fmt, ...) do { \
 if (offset < size) \
     { \
     offset += snprintf(buf + offset, size - offset, fmt, __VA_ARGS__); \
     }\
 }while ()

 inline void StrAppend(char buf[], const uint32_t bufLen, uint32_t &offset, const char *fmt, ...)
 {
     va_list argptr;
     va_start(argptr, fmt);
     if (offset < bufLen)
     {
         offset += vsnprintf(buf + offset, bufLen - offset, fmt, argptr);
     }
     va_end(argptr);
 }

 int32_t main(int32_t argc, char *argv[])
 {
     char buf[] = {  };
     uint32_t offset = ;
     StrAppend(buf, , offset, "%d ", );
     StrAppend(buf, , offset, ",%s--", "qwe");
     StrAppend(buf, , offset, ",%0.2f!!!", 1.0);
     printf("%s\n", buf);
     offset = ;
     STRAPPEND(buf, , offset, "%d ", );
     STRAPPEND(buf, , offset, ",%s--", "qwe1");
     STRAPPEND(buf, , offset, ",%0.3f!!!", 11.0);
     printf("%s\n", buf);
     return ;
 }