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#include "stdio_impl.h"
static size_t sn_write(FILE *f, const unsigned char *s, size_t l)
{
/* pretend to succeed, but discard data */
return l;
}
int vsnprintf(char *s, size_t n, const char *fmt, va_list ap)
{
int r;
FILE f;
unsigned char buf[1];
memset(&f, 0, sizeof(FILE));
f.lbf = EOF;
f.write = sn_write;
f.buf_size = 1;
f.buf = buf;
f.lock = -1;
if (n > INT_MAX) {
errno = EOVERFLOW;
return -1;
} else if (n > 0) {
if (n > (char *)0+SIZE_MAX-s) n = (char *)0+SIZE_MAX-s;
f.wpos = (void *)s;
f.wbase = f.wend = (void *)(s+n-1);
f.wstop = f.wend - 1;
}
r = vfprintf(&f, fmt, ap);
/* wpos points just after last byte written, or to s+n-1 (wbase) */
*f.wpos = 0;
return r;
}
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