ref: 12ccbe2af48585937a4bc80c6e559b9617c6aac6
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; if (siz != 0) *f.wp = '\0'; } return r; }