xref: /illumos-gate/usr/src/contrib/ast/src/lib/libast/string/strnpcmp.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 /*
27  * path prefix strncmp(3) -- longest first!
28  */
29 
30 int
strnpcmp(register const char * a,register const char * b,size_t n)31 strnpcmp(register const char* a, register const char* b, size_t n)
32 {
33 	register const char*	e;
34 
35 	e = a + n;
36 	for (;;)
37 	{
38 		if (a >= e)
39 			return 0;
40 		if (*a != *b)
41 			break;
42 		if (!*a++)
43 			return 0;
44 		b++;
45 	}
46 	if (*a == 0 && *b == '/')
47 		return 1;
48 	if (*a == '/' && *b == 0)
49 		return -1;
50 	return (a < b) ? -1 : 1;
51 }
52