1 #include "stdio_impl.h"
3 static size_t sn_write(FILE *f, const unsigned char *s, size_t l)
5 size_t k = f->wend - f->wpos;
9 /* pretend to succeed, but discard extra data */
13 int vsnprintf(char *s, size_t n, const char *fmt, va_list ap)
17 FILE f = { .lbf = EOF, .write = sn_write, .lock = -1 };
19 if (n-1 > INT_MAX-1) {
28 /* Ensure pointers don't wrap if "infinite" n is passed in */
29 if (n > (char *)0+SIZE_MAX-s-1) n = (char *)0+SIZE_MAX-s-1;
31 f.buf = f.wpos = (void *)s;
32 f.wbase = f.wend = (void *)(s+n);
33 r = vfprintf(&f, fmt, ap);
35 /* Null-terminate, overwriting last char if dest buffer is full */
36 if (n) f.wpos[-(f.wpos == f.wend)] = 0;