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/* mbsncmp - multibyte string comparison. */
/* Copyright (C) 1995-2023 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Bash 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with Bash. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#if !defined (HAVE_MBSNCMP) && defined (HANDLE_MULTIBYTE)
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <wchar.h>
extern int locale_utf8locale;
/* Compare MBS1 and MBS2 up to N multibyte characters. */
int
mbsncmp (const char *mbs1, const char *mbs2, size_t n)
{
int len1, len2, mb_cur_max;
wchar_t c1, c2;
mbstate_t state1 = { 0 }, state2 = { 0 };
len1 = len2 = 0;
mb_cur_max = MB_CUR_MAX;
if (n == 0)
return 0;
do
{
len1 = mbrtowc (&c1, mbs1, mb_cur_max, &state1);
len2 = mbrtowc (&c2, mbs2, mb_cur_max, &state2);
if (len1 == 0)
return len2 == 0 ? 0 : -1;
else if (len2 == 0)
return 1;
else if (len1 > 0 && len2 < 0)
return -1;
else if (len1 < 0 && len2 > 0)
return 1;
else if (len1 < 0 && len2 < 0)
{
len1 = strlen (mbs1);
len2 = strlen (mbs2);
return (len1 == len2 ? memcmp (mbs1, mbs2, len1)
: ((len1 < len2) ? (memcmp (mbs1, mbs2, len1) > 0 ? 1 : -1)
: (memcmp (mbs1, mbs2, len2) >= 0 ? 1 : -1)));
}
mbs1 += len1;
mbs2 += len2;
n--;
if (c1 != c2)
break;
}
while (n > 0);
return c1 - c2;
}
#endif
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