1 /* c-strcasecmp.c -- case insensitive string comparator in C locale
2 Copyright (C) 1998-1999, 2005-2006, 2009-2019 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, see <https://www.gnu.org/licenses/>. */
20 #include "c-strcase.h"
27 c_strcasecmp (const char *s1
, const char *s2
)
29 register const unsigned char *p1
= (const unsigned char *) s1
;
30 register const unsigned char *p2
= (const unsigned char *) s2
;
49 if (UCHAR_MAX
<= INT_MAX
)
52 /* On machines where 'char' and 'int' are types of the same size, the
53 difference of two 'unsigned char' values - including the sign bit -
54 doesn't fit in an 'int'. */
55 return (c1
> c2
? 1 : c1
< c2
? -1 : 0);