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70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
/* Compare at most N wide characters of two strings without taking care
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for the case.
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Copyright (C) 1992-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <wchar.h>
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#include <wctype.h>
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#ifndef weak_alias
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# define __wcsncasecmp wcsncasecmp
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# define TOLOWER(Ch) towlower (Ch)
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#else
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# ifdef USE_IN_EXTENDED_LOCALE_MODEL
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# define __wcsncasecmp __wcsncasecmp_l
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# define TOLOWER(Ch) __towlower_l ((Ch), loc)
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# else
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# define TOLOWER(Ch) towlower (Ch)
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# endif
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#endif
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#ifdef USE_IN_EXTENDED_LOCALE_MODEL
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# define LOCALE_PARAM , locale_t loc
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#else
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# define LOCALE_PARAM
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#endif
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/* Compare no more than N wide characters of S1 and S2,
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ignoring case, returning less than, equal to or
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greater than zero if S1 is lexicographically less
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than, equal to or greater than S2. */
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int
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__wcsncasecmp (const wchar_t *s1, const wchar_t *s2, size_t n LOCALE_PARAM)
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{
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wint_t c1, c2;
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if (s1 == s2 || n == 0)
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return 0;
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do
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{
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c1 = (wint_t) TOLOWER (*s1++);
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c2 = (wint_t) TOLOWER (*s2++);
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if (c1 == L'\0' || c1 != c2)
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return c1 - c2;
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} while (--n > 0);
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return c1 - c2;
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}
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#ifndef __wcsncasecmp
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weak_alias (__wcsncasecmp, wcsncasecmp)
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#endif
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