1/* mbscmp - multibyte string comparison. */
2
3/* Copyright (C) 1995 Free Software Foundation, Inc.
4
5   This file is part of GNU Bash, the Bourne Again SHell.
6
7   Bash is free software: you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation, either version 3 of the License, or
10   (at your option) any later version.
11
12   Bash is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   GNU General Public License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with Bash.  If not, see <http://www.gnu.org/licenses/>.
19*/
20
21#include <config.h>
22
23#if !defined (HAVE_MBSCMP) && defined (HANDLE_MULTIBYTE)
24
25#include <stdlib.h>
26#include <stddef.h>
27
28/* Compare MBS1 and MBS2.  */
29int
30mbscmp (mbs1, mbs2)
31    const char *mbs1;
32    const char *mbs2;
33{
34  int len1, len2;
35  wchar_t c1, c2;
36
37  len1 = len2 = 0;
38  /* Reset multibyte characters to their initial state.	 */
39  (void) mblen ((char *) NULL, 0);
40
41  do
42    {
43      len1 = mbtowc ((wchar_t *) &c1, mbs1, MB_CUR_MAX);
44      len2 = mbtowc ((wchar_t *) &c2, mbs2, MB_CUR_MAX);
45
46      if (len1 == 0)
47	return len2 == 0 ? 0 : -1;
48      if (len2 == 0)
49	return 1;
50      if (len1 < 0 || len2 < 0)
51	/* FIXME: an illegal character appears.	 What to do?  */
52	return c1 - c2;
53
54      mbs1 += len1;
55      mbs2 += len2;
56    }
57  while (c1 == c2);
58
59  return c1 - c2;
60}
61
62#endif
63