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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 <wchar.h> #include <errno.h> #include "internal.h" size_t wcrtomb(char *restrict s, wchar_t wc, mbstate_t *restrict st) { if (!s) return 1; if ((unsigned)wc < 0x80) { *s = wc; return 1; } else if (MB_CUR_MAX == 1) { if (!IS_CODEUNIT(wc)) { errno = EILSEQ; return -1; } *s = wc; return 1; } else if ((unsigned)wc < 0x800) { *s++ = 0xc0 | (wc>>6); *s = 0x80 | (wc&0x3f); return 2; } else if ((unsigned)wc < 0xd800 || (unsigned)wc-0xe000 < 0x2000) { *s++ = 0xe0 | (wc>>12); *s++ = 0x80 | ((wc>>6)&0x3f); *s = 0x80 | (wc&0x3f); return 3; } else if ((unsigned)wc-0x10000 < 0x100000) { *s++ = 0xf0 | (wc>>18); *s++ = 0x80 | ((wc>>12)&0x3f); *s++ = 0x80 | ((wc>>6)&0x3f); *s = 0x80 | (wc&0x3f); return 4; } errno = EILSEQ; return -1; } |