57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
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/* c-strcasecmp.c -- case insensitive string comparator in C locale
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Copyright (C) 1998-1999, 2005-2006, 2009-2020 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 3, 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, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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/* Specification. */
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#include "c-strcase.h"
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#include <limits.h>
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#include "c-ctype.h"
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int
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c_strcasecmp (const char *s1, const char *s2)
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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)
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return 0;
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do
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{
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c1 = c_tolower (*p1);
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c2 = c_tolower (*p2);
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if (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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if (UCHAR_MAX <= INT_MAX)
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return c1 - c2;
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else
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/* On machines where 'char' and 'int' are types of the same size, the
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difference of two 'unsigned char' values - including the sign bit -
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doesn't fit in an 'int'. */
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return (c1 > c2 ? 1 : c1 < c2 ? -1 : 0);
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}
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