Loading...
#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; 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 = s; f.wbase = f.wend = 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; } |