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#include <wchar.h> size_t wcsnrtombs(char *restrict dst, const wchar_t **restrict wcs, size_t wn, size_t n, mbstate_t *restrict st) { size_t l, cnt=0, n2; char *s, buf[256]; const wchar_t *ws = *wcs; const wchar_t *tmp_ws; if (!dst) s = buf, n = sizeof buf; else s = dst; while ( ws && n && ( (n2=wn)>=n || n2>32 ) ) { if (n2>=n) n2=n; tmp_ws = ws; l = wcsrtombs(s, &ws, n2, 0); if (!(l+1)) { cnt = l; n = 0; break; } if (s != buf) { s += l; n -= l; } wn = ws ? wn - (ws - tmp_ws) : 0; cnt += l; } if (ws) while (n && wn) { l = wcrtomb(s, *ws, 0); if ((l+1)<=1) { if (!l) ws = 0; else cnt = l; break; } ws++; wn--; /* safe - this loop runs fewer than sizeof(buf) times */ s+=l; n-=l; cnt += l; } if (dst) *wcs = ws; return cnt; } |