fxlibc/src/libc/stdio/vsprintf.c

#include <stdio.h>
#include <fxlibc/printf.h>

int vsprintf(char * restrict str, char const * restrict fmt, va_list args)
{
	/* This is valid even if str=NULL. */
	struct __printf_output out = {
		.str = str,
		.size = 65536,
	};

	return __printf(&out, fmt, &args);
}