/* Copyright (C) 1991, 1992, 1995 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include #include #include #include #include #include long int _mb_shift = 0; /* Convert the multibyte character at S, which is no longer than N characters, to its `wchar_t' representation, placing this n *PWC and returning its length. */ int DEFUN(mbtowc, (pwc, s, n), wchar_t *pwc AND CONST char *s AND size_t n) { register CONST mb_char *mb; register wchar_t i; if (s == NULL) return _mb_shift != 0; if (*s == '\0') /* ANSI 4.10.7.2, line 19. */ return 0; if (isascii (*s)) { /* A normal ASCII character translates to itself. */ if (pwc != NULL) *pwc = (wchar_t) *s; return 1; } if (_ctype_info->mbchar == NULL || _ctype_info->mbchar->mb_chars == NULL) return -1; if (n > MB_CUR_MAX) n = MB_CUR_MAX; for (i = 0; i < WCHAR_MAX; ++i) { mb = &_ctype_info->mbchar->mb_chars[i]; /* EOF and NUL aren't MB chars. */ if (i == (wchar_t) EOF || i == (wchar_t) '\0') continue; /* Normal ASCII values can't start MB chars. */ else if (isascii(i)) continue; else if (mb->string == NULL || mb->len == 0) continue; else if (mb->len > n) continue; else if (!strncmp(mb->string, s, mb->len)) { _mb_shift += mb->shift; if (pwc != NULL) *pwc = i; return mb->len; } } return -1; }