sj4/lib/sj4core/srchidx.c

/*
 * Copyright (c) 1991-1994  Sony Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL SONY CORPORATION BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * Except as contained in this notice, the name of Sony Corporation
 * shall not be used in advertising or otherwise to promote the sale, use
 * or other dealings in this Software without prior written authorization
 * from Sony Corporation.
 *
 */


#include "sj_kcnv.h"

#include "sj_kanakan.h"

TypeDicSeg
srchidx(SJ4_CONTEXT TypeDicSeg low, int len) {
	TypeDicSeg high;
	TypeDicSeg mid;
	int	   cmp;
	u_char*	   target;

	if((high = curdict->segunit - 1) < 1) return 0;

	if(low == (TypeDicSeg)-1) low = 0;

	while(low <= high) {

		mid = (low + high) >> 1;

		target = get_idxptr(SJ4_CONTEXT_PASS mid);

		cmp = istrcmp(cnvstart, target, len, sstrlen(target));

		if(cmp == OVER) {
			high = mid - 1;
		}

		else if(cmp != MATCH) {
			low = mid + 1;
		}

		else {
			return mid;
		}
	}

	return (cmp == OVER && mid != DICSEGBASE) ? mid - 1 : mid;
}