xref: /titanic_51/usr/src/lib/libast/common/string/struniq.c (revision 853389e344087efe23a5cc688693e5301a1cb90d)
1 /***********************************************************************
2 *                                                                      *
3 *               This software is part of the ast package               *
4 *           Copyright (c) 1985-2007 AT&T Knowledge Ventures            *
5 *                      and is licensed under the                       *
6 *                  Common Public License, Version 1.0                  *
7 *                      by AT&T Knowledge Ventures                      *
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  * struniq - uniq a sorted argv
25  * 0 sentinel is neither expected nor restored
26  *
27  * Glenn Fowler
28  * David Korn
29  * AT&T Research
30  */
31 
32 #include <ast.h>
33 
34 int
35 struniq(char** argv, int n)
36 {
37 	register char**	ao;
38 	register char**	an;
39 	register char**	ae;
40 
41 	ao = an = argv;
42 	ae = ao + n;
43 	while (++an < ae)
44 	{
45 		while (streq(*ao, *an))
46 			if (++an >= ae)
47 				return ao - argv + 1;
48 		*++ao = *an;
49 	}
50 	return ao - argv + 1;
51 }
52