35 lines
597 B
C
35 lines
597 B
C
#include <wchar.h>
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#include <limits.h>
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#include <string.h>
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size_t wcsnrtombs(char *restrict dst, const wchar_t **restrict wcs, size_t wn, size_t n, mbstate_t *restrict st)
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{
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const wchar_t *ws = *wcs;
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size_t cnt = 0;
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if (!dst) n=0;
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while (ws && wn) {
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char tmp[MB_LEN_MAX];
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size_t l = wcrtomb(n<MB_LEN_MAX ? tmp : dst, *ws, 0);
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if (l==-1) {
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cnt = -1;
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break;
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}
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if (dst) {
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if (n<MB_LEN_MAX) {
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if (l>n) break;
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memcpy(dst, tmp, l);
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}
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dst += l;
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n -= l;
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}
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if (!*ws) {
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ws = 0;
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break;
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}
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ws++;
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wn--;
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cnt += l;
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}
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if (dst) *wcs = ws;
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return cnt;
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}
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