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/* * This code was written by Rich Felker in 2010; no copyright is claimed. * This code is in the public domain. Attribution is appreciated but * unnecessary. */ #include <stdlib.h> #include <inttypes.h> #include <wchar.h> #include <errno.h> #include "internal.h" size_t wcsrtombs(char *s, const wchar_t **ws, size_t n, mbstate_t *st) { const wchar_t *ws2; char buf[4]; size_t N = n, l; if (!s) { for (n=0, ws2=*ws; *ws2; ws2++) { if (*ws2 >= 0x80) { l = wcrtomb(buf, *ws2, 0); if (!(l+1)) return -1; n += l; } else n++; } return n; } while (n>=4 && **ws) { if (**ws >= 0x80) { l = wcrtomb(s, **ws, 0); if (!(l+1)) return -1; s += l; n -= l; } else { *s++ = **ws; n--; } (*ws)++; } while (n && **ws) { if (**ws >= 0x80) { l = wcrtomb(buf, **ws, 0); if (!(l+1)) return -1; if (l>n) return N-n; wcrtomb(s, **ws, 0); s += l; n -= l; } else { *s++ = **ws; n--; } (*ws)++; } if (n) *s = 0; *ws = 0; return N-n; } |