79 lines
2.2 KiB
C
79 lines
2.2 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, 1996, 1997 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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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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# ifdef USE_IN_EXTENDED_LOCALE_MODEL
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# define __strncasecmp __strncasecmp_l
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# define TOLOWER(Ch) __tolower_l ((Ch), loc)
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# else
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# define TOLOWER(Ch) tolower (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 , loc
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# define LOCALE_PARAM_DECL __locale_t loc;
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#else
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# define LOCALE_PARAM
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# define LOCALE_PARAM_DECL
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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 (s1, s2, n LOCALE_PARAM)
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const char *s1;
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const char *s2;
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size_t n;
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LOCALE_PARAM_DECL
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{
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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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unsigned char c1, c2;
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if (p1 == p2 || n == 0)
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return 0;
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do
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{
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c1 = TOLOWER (*p1++);
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c2 = TOLOWER (*p2++);
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if (c1 == '\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 __strncasecmp
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weak_alias (__strncasecmp, strncasecmp)
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#endif
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