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 * 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
struniq(char ** argv,int n)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