ref: f53e048d3a57eeee135e2d8aa3cd72b7f3dc2711
dir: /src/libc/stdio/vsnprintf.c/
#include <stdarg.h> #include <stdio.h> #undef vsnprintf int vsnprintf(char *restrict s, size_t siz, const char *restrict fmt, va_list ap) { FILE f; int r; f.flags = _IORW | _IOSTRG; f.len = siz; f.buf = s; f.wp = s; f.rp = s + siz; r = vfprintf(&f, fmt, ap); if (s) { if (f.wp == f.rp) --f.wp; *f.wp = '\0'; } return r; }