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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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|
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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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|
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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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|
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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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|
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#if HAVE_CONFIG_H |
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# include <config.h> |
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#endif |
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|
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#define LENGTH_LIMIT |
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|
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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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|
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#include <stddef.h> |
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#include <ctype.h> |
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|
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#define TOLOWER(Ch) (isupper (Ch) ? tolower (Ch) : (Ch)) |
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|
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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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|
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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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|
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if (p1 == p2 || LENGTH_LIMIT_EXPR (n == 0)) |
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return 0; |
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|
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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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|
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if (LENGTH_LIMIT_EXPR (--n == 0) || c1 == '\0') |
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break; |
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|
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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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|
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return c1 - c2; |
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} |
