src/stdio/vsscanf.c

   1 #include "stdio_impl.h"
   2 #include <string.h>
   3
   4 static size_t string_read(FILE *f, unsigned char *buf, size_t len)
   5 {
   6         char *src = f->cookie;
   7         size_t k = len+256;
   8         char *end = memchr(src, 0, k);
   9         if (end) k = end-src;
  10         if (k < len) len = k;
  11         memcpy(buf, src, len);
  12         f->rpos = (void *)(src+len);
  13         f->rend = (void *)(src+k);
  14         f->cookie = src+k;
  15         return len;
  16 }
  17
  18 int vsscanf(const char *restrict s, const char *restrict fmt, va_list ap)
  19 {
  20         FILE f = {
  21                 .buf = (void *)s, .cookie = (void *)s,
  22                 .read = string_read, .lock = -1
  23         };
  24         return vfscanf(&f, fmt, ap);
  25 }
  26
  27 weak_alias(vsscanf,__isoc99_vsscanf);