src/stdio/vswscanf.c

   1 #include "stdio_impl.h"
   2 #include "libc.h"
   3 #include <wchar.h>
   4
   5 static size_t wstring_read(FILE *f, unsigned char *buf, size_t len)
   6 {
   7         const wchar_t *src = f->cookie;
   8         size_t k;
   9
  10         if (!src) return 0;
  11
  12         k = wcsrtombs((void *)f->buf, &src, f->buf_size, 0);
  13         if (k==(size_t)-1) {
  14                 f->rpos = f->rend = 0;
  15                 return 0;
  16         }
  17
  18         f->rpos = f->buf;
  19         f->rend = f->buf + k;
  20         f->cookie = (void *)src;
  21
  22         if (!len || !k) return 0;
  23
  24         *buf = *f->rpos++;
  25         return 1;
  26 }
  27
  28 int vswscanf(const wchar_t *restrict s, const wchar_t *restrict fmt, va_list ap)
  29 {
  30         unsigned char buf[256];
  31         FILE f = {
  32                 .buf = buf, .buf_size = sizeof buf,
  33                 .cookie = (void *)s,
  34                 .read = wstring_read, .lock = -1
  35         };
  36         return vfwscanf(&f, fmt, ap);
  37 }
  38
  39 weak_alias(vswscanf,__isoc99_vswscanf);