xref: /titanic_41/usr/src/lib/libast/common/string/strnacmp.c (revision 31a2903539e29171f5c5da80e5c9616c70108116)
1 /***********************************************************************
2 *                                                                      *
3 *               This software is part of the ast package               *
4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
5 *                      and is licensed under the                       *
6 *                  Common Public License, Version 1.0                  *
7 *                    by AT&T Intellectual Property                     *
8 *                                                                      *
9 *                A copy of the License is available at                 *
10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
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 /*
25  * ccmapc(c, CC_NATIVE, CC_ASCII) and strncmp
26  */
27 
28 #include <ast.h>
29 #include <ccode.h>
30 
31 #if _lib_strnacmp
32 
33 NoN(strnacmp)
34 
35 #else
36 
37 #include <ctype.h>
38 
39 int
40 strnacmp(const char* a, const char* b, size_t n)
41 {
42 #if CC_NATIVE == CC_ASCII
43 	return strncmp(a, b, n);
44 #else
45 	register unsigned char*	ua = (unsigned char*)a;
46 	register unsigned char*	ub = (unsigned char*)b;
47 	register unsigned char*	ue;
48 	register unsigned char*	m;
49 	register int		c;
50 	register int		d;
51 
52 	m = ccmap(CC_NATIVE, CC_ASCII);
53 	ue = ua + n;
54 	while (ua < ue)
55 	{
56 		c = m[*ua++];
57 		if (d = c - m[*ub++])
58 			return d;
59 		if (!c)
60 			return 0;
61 	}
62 	return 0;
63 #endif
64 }
65 
66 #endif
67