Mercurial > gnulib
view lib/c-strcasecmp.c @ 17576:344018b6e5d7
maint: update copyright
I ran 'make update-copyright'.
Signed-off-by: Eric Blake <eblake@redhat.com>
author | Eric Blake <eblake@redhat.com> |
---|---|
date | Wed, 01 Jan 2014 00:04:40 -0700 |
parents | e542fd46ad6f |
children | ab58d4870664 |
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/* c-strcasecmp.c -- case insensitive string comparator in C locale Copyright (C) 1998-1999, 2005-2006, 2009-2014 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, see <http://www.gnu.org/licenses/>. */ #include <config.h> /* Specification. */ #include "c-strcase.h" #include <limits.h> #include "c-ctype.h" int c_strcasecmp (const char *s1, const char *s2) { register const unsigned char *p1 = (const unsigned char *) s1; register const unsigned char *p2 = (const unsigned char *) s2; unsigned char c1, c2; if (p1 == p2) return 0; do { c1 = c_tolower (*p1); c2 = c_tolower (*p2); if (c1 == '\0') break; ++p1; ++p2; } while (c1 == c2); if (UCHAR_MAX <= INT_MAX) return c1 - c2; else /* On machines where 'char' and 'int' are types of the same size, the difference of two 'unsigned char' values - including the sign bit - doesn't fit in an 'int'. */ return (c1 > c2 ? 1 : c1 < c2 ? -1 : 0); }