/*	$NetBSD: src/lib/libc/nls/catgets.c,v 1.15 1999/08/17 04:00:51 mycroft Exp $	*/
/*	$DragonFly: src/lib/libc/nls/catgets.c,v 1.2 2005/11/20 09:18:37 swildner Exp $ */

/*-
 * Copyright (c) 1996 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by J.T. Conklin.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *        This product includes software developed by the NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#define _NLS_PRIVATE

#include <sys/types.h>
#include <arpa/inet.h>
#include <errno.h>
#include <nl_types.h>
#include <stdlib.h>
#include <string.h>

__weak_reference(_catgets, catgets);

char *
_catgets(nl_catd catd, int set_id, int msg_id, const char *s)
{
	struct _nls_cat_hdr *cat_hdr;
	struct _nls_set_hdr *set_hdr;
	struct _nls_msg_hdr *msg_hdr;
	int l, u, i, r;

	if (catd == (nl_catd)(-1)) {
		errno = EBADF;
		/* LINTED interface problem */
		return((char *)s);
	}

	cat_hdr = (struct _nls_cat_hdr *)catd->__data; 
	set_hdr = (struct _nls_set_hdr *)(void *)((char *)catd->__data
		+ sizeof(struct _nls_cat_hdr));

	/* binary search, see knuth algorithm b */
	l = 0;
	u = ntohl((uint32_t)cat_hdr->__nsets) - 1;
	while (l <= u) {
		i = (l + u) / 2;
		r = set_id - ntohl((uint32_t)set_hdr[i].__setno);

		if (r == 0) {
			msg_hdr = (struct _nls_msg_hdr *)
			    (void *)((char *)catd->__data +
			    sizeof(struct _nls_cat_hdr) +
			    ntohl((uint32_t)cat_hdr->__msg_hdr_offset));

			l = ntohl((uint32_t)set_hdr[i].__index);
			u = l + ntohl((uint32_t)set_hdr[i].__nmsgs) - 1;
			while (l <= u) {
				i = (l + u) / 2;
				r = msg_id -
				    ntohl((uint32_t)msg_hdr[i].__msgno);
				if (r == 0) {
					return((char *) catd->__data +
					    sizeof(struct _nls_cat_hdr) +
					    ntohl((uint32_t)
					    cat_hdr->__msg_txt_offset) +
					    ntohl((uint32_t)
					    msg_hdr[i].__offset));
				} else if (r < 0) {
					u = i - 1;
				} else {
					l = i + 1;
				}
			}

			/* not found */
			goto notfound;

		} else if (r < 0) {
			u = i - 1;
		} else {
			l = i + 1;
		}
	}

notfound:
	/* not found */
	errno = ENOMSG;
	/* LINTED interface problem */
	return((char *)s);
}