xref: /illumos-gate/usr/src/contrib/ast/src/lib/libast/comp/strcasecmp.c (revision b30d193948be5a7794d7ae3ba0ed9c2f72c88e0f)
1 /***********************************************************************
2 *                                                                      *
3 *               This software is part of the ast package               *
4 *          Copyright (c) 1985-2011 AT&T Intellectual Property          *
5 *                      and is licensed under the                       *
6 *                 Eclipse Public License, Version 1.0                  *
7 *                    by AT&T Intellectual Property                     *
8 *                                                                      *
9 *                A copy of the License is available at                 *
10 *          http://www.eclipse.org/org/documents/epl-v10.html           *
11 *         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
12 *                                                                      *
13 *              Information and Software Systems Research               *
14 *                            AT&T Research                             *
15 *                           Florham Park NJ                            *
16 *                                                                      *
17 *                 Glenn Fowler <gsf@research.att.com>                  *
18 *                  David Korn <dgk@research.att.com>                   *
19 *                   Phong Vo <kpv@research.att.com>                    *
20 *                                                                      *
21 ***********************************************************************/
22 #pragma prototyped
23 
24 #include <ast.h>
25 
26 #if _lib_strcasecmp
27 
28 NoN(strcasecmp)
29 
30 #else
31 
32 #include <ctype.h>
33 
34 #undef	strcasecmp
35 
36 int
37 strcasecmp(register const char* a, register const char* b)
38 {
39 	register int	ac;
40 	register int	bc;
41 	register int	d;
42 
43 	for (;;)
44 	{
45 		ac = *a++;
46 		if (isupper(ac))
47 			ac = tolower(ac);
48 		bc = *b++;
49 		if (isupper(bc))
50 			bc = tolower(bc);
51 		if (d = ac - bc)
52 			return d;
53 		if (!ac)
54 			return 0;
55 	}
56 }
57 
58 #endif
59