67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
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/* strcasecmp.c -- case insensitive string comparator
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Copyright (C) 1998, 1999 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#ifdef LENGTH_LIMIT
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# define STRXCASECMP_FUNCTION strncasecmp
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# define STRXCASECMP_DECLARE_N , size_t n
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# define LENGTH_LIMIT_EXPR(Expr) Expr
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#else
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# define STRXCASECMP_FUNCTION strcasecmp
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# define STRXCASECMP_DECLARE_N /* empty */
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# define LENGTH_LIMIT_EXPR(Expr) 0
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#endif
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#include <sys/types.h>
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#include <ctype.h>
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#define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch))
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/* Compare {{no more than N characters of }}strings 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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STRXCASECMP_FUNCTION (const char *s1, const char *s2 STRXCASECMP_DECLARE_N)
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{
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register const unsigned char *p1 = (const unsigned char *) s1;
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register const unsigned char *p2 = (const unsigned char *) s2;
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unsigned char c1, c2;
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if (p1 == p2 || LENGTH_LIMIT_EXPR (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 (LENGTH_LIMIT_EXPR (--n == 0) || c1 == '\0')
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break;
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++p1;
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++p2;
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}
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while (c1 == c2);
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return c1 - c2;
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}
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