###### (This is the documentation for SDL3, which is the current stable version. [SDL2](https://wiki.libsdl.org/SDL2/) was the previous version!) # SDL_PRINTF_VARARG_FUNC Macro that annotates a vararg function that operates like printf. ## Header File Defined in [](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_stdinc.h) ## Syntax ```c #define SDL_PRINTF_VARARG_FUNC( fmtargnumber ) __attribute__ (( format( __printf__, fmtargnumber, fmtargnumber+1 ))) ``` ## Remarks If we were to annotate `fprintf`: ```c int fprintf(FILE *f, const char *fmt, ...) SDL_PRINTF_VARARG_FUNC(2); ``` This notes that the second parameter should be a printf-style format string, followed by `...`. The compiler or other analysis tools can warn when this doesn't appear to be the case. On compilers without this annotation mechanism, this is defined to nothing. This can (and should) be used with [SDL_PRINTF_FORMAT_STRING](SDL_PRINTF_FORMAT_STRING) as well, which between them will cover at least Visual Studio, GCC, and Clang. ## Version This macro is available since SDL 3.1.3. ---- [CategoryAPI](CategoryAPI), [CategoryAPIMacro](CategoryAPIMacro), [CategoryStdinc](CategoryStdinc)