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 * Glenn Fowler 25 * AT&T Research 26 */ 27 28#include <ast.h> 29 30/* 31 * return a pointer to the element matching 32 * name in the (*comparf*)() sorted tab of num elements of 33 * size siz where the first member of each 34 * element is a char* 35 * 36 * 0 returned if name not found 37 */ 38 39void* 40strsearch(const void* tab, size_t num, size_t siz, Strcmp_f comparf, const char* name, void* context) 41{ 42 register char* lo = (char*)tab; 43 register char* hi = lo + (num - 1) * siz; 44 register char* mid; 45 register int v; 46 47 while (lo <= hi) 48 { 49 mid = lo + (((hi - lo) / siz) / 2) * siz; 50 if (!(v = context ? (*(Strcmp_context_f)comparf)(name, *((char**)mid), context) : (*comparf)(name, *((char**)mid)))) 51 return (void*)mid; 52 else if (v > 0) 53 lo = mid + siz; 54 else hi = mid - siz; 55 } 56 return 0; 57} 58