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