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strsearch.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2008 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * Glenn Fowler
 * AT&T Research
 */

#include <ast.h>

/*
 * return a pointer to the element matching
 * name in the (*comparf*)() sorted tab of num elements of
 * size siz where the first member of each
 * element is a char*
 *
 * 0 returned if name not found
 */

void*
strsearch(const void* tab, size_t num, size_t siz, Strcmp_f comparf, const char* name, void* context)
{
      register char*          lo = (char*)tab;
      register char*          hi = lo + (num - 1) * siz;
      register char*          mid;
      register int            v;

      while (lo <= hi)
      {
            mid = lo + (((hi - lo) / siz) / 2) * siz;
            if (!(v = context ? (*(Strcmp_context_f)comparf)(name, *((char**)mid), context) : (*comparf)(name, *((char**)mid))))
                  return (void*)mid;
            else if (v > 0)
                  lo = mid + siz;
            else hi = mid - siz;
      }
      return 0;
}

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