NAME¶

SDL_snprintf - This works exactly like snprintf() but doesn't require access to a C runtime.

HEADER FILE¶

Defined in SDL3/SDL_stdinc.h

SYNOPSIS¶

#include "SDL3/SDL.h"

int SDL_snprintf(char *text, size_t maxlen, const char *fmt, ...);

DESCRIPTION¶

Format a string of up to maxlen -1 bytes, converting each '%' item with values provided through variable arguments.

While some C runtimes differ on how to deal with too-large strings, this function null-terminates the output, by treating the null-terminator as part of the maxlen count. Note that if maxlen is zero, however, no bytes will be written at all.

This function returns the number of _bytes_ (not _characters_) that should be written, excluding the null-terminator character. If this returns a number >= maxlen , it means the output string was truncated. A negative return value means an error occurred.

Referencing the output string's pointer with a format item is undefined behavior.

FUNCTION PARAMETERS¶

text

the buffer to write the string into. Must not be NULL.

maxlen

the maximum bytes to write, including the null-terminator.

fmt

a printf-style format string. Must not be NULL.

...

a list of values to be used with the format string.

RETURN VALUE¶

Returns the number of bytes that should be written, not counting the null-terminator char, or a negative value on error.

THREAD SAFETY¶

It is safe to call this function from any thread.

AVAILABILITY¶

This function is available since SDL 3.2.0.