From 28f540f45bbacd939bfd07f213bcad2bf730b1bf Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Sat, 18 Feb 1995 01:27:10 +0000 Subject: initial import --- stdlib/mbtowc.c | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 84 insertions(+) create mode 100644 stdlib/mbtowc.c (limited to 'stdlib/mbtowc.c') diff --git a/stdlib/mbtowc.c b/stdlib/mbtowc.c new file mode 100644 index 0000000..6210340 --- /dev/null +++ b/stdlib/mbtowc.c @@ -0,0 +1,84 @@ +/* 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; +} -- cgit v1.1