| 1 | #include <wchar.h> |
| 2 | #include <limits.h> |
| 3 | #include <string.h> |
| 4 | |
| 5 | size_t wcsnrtombs(char *restrict dst, const wchar_t **restrict wcs, size_t wn, size_t n, mbstate_t *restrict st) |
| 6 | { |
| 7 | const wchar_t *ws = *wcs; |
| 8 | size_t cnt = 0; |
| 9 | if (!dst) n=0; |
| 10 | while (ws && wn) { |
| 11 | char tmp[MB_LEN_MAX]; |
| 12 | size_t l = wcrtomb(n<MB_LEN_MAX ? tmp : dst, *ws, 0); |
| 13 | if (l==-1) { |
| 14 | cnt = -1; |
| 15 | break; |
| 16 | } |
| 17 | if (dst) { |
| 18 | if (n<MB_LEN_MAX) { |
| 19 | if (l>n) break; |
| 20 | memcpy(dst, tmp, l); |
| 21 | } |
| 22 | dst += l; |
| 23 | n -= l; |
| 24 | } |
| 25 | if (!*ws) { |
| 26 | ws = 0; |
| 27 | break; |
| 28 | } |
| 29 | ws++; |
| 30 | wn--; |
| 31 | cnt += l; |
| 32 | } |
| 33 | if (dst) *wcs = ws; |
| 34 | return cnt; |
| 35 | } |