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70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
/* Compare at most N characters of two strings without taking care for
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the case.
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Copyright (C) 1992-2023 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 <string.h>
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#include <ctype.h>
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#ifndef weak_alias
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# define __strncasecmp strncasecmp
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# define TOLOWER(Ch) tolower (Ch)
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#else
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# include <locale/localeinfo.h>
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# ifdef USE_IN_EXTENDED_LOCALE_MODEL
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# define __strncasecmp __strncasecmp_l
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# endif
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# define TOLOWER(Ch) __tolower_l ((Ch), loc)
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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 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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__strncasecmp (const char *s1, const char *s2, size_t n LOCALE_PARAM)
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{
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#if defined _LIBC && !defined USE_IN_EXTENDED_LOCALE_MODEL
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locale_t loc = _NL_CURRENT_LOCALE;
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#endif
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const unsigned char *p1 = (const unsigned char *) s1;
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const unsigned char *p2 = (const unsigned char *) s2;
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int result;
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if (p1 == p2 || n == 0)
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return 0;
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while ((result = TOLOWER (*p1) - TOLOWER (*p2++)) == 0)
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if (*p1++ == '\0' || --n == 0)
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break;
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return result;
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}
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#ifndef __strncasecmp
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weak_alias (__strncasecmp, strncasecmp)
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#endif
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