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