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/* $OpenBSD: catgets.c,v 1.8 2008/06/26 05:42:05 ray 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.
*
* 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 REGENTS 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 <errno.h>
#include <stdlib.h>
#include <string.h>
#include <nl_types.h>
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;
return (char *) s;
}
cat_hdr = (struct _nls_cat_hdr *) catd->__data;
set_hdr = (struct _nls_set_hdr *) ((char *)catd->__data
+ sizeof(struct _nls_cat_hdr));
/* binary search, see knuth algorithm b */
l = 0;
u = ntohl(cat_hdr->__nsets) - 1;
while (l <= u) {
i = (l + u) / 2;
r = set_id - ntohl(set_hdr[i].__setno);
if (r == 0) {
msg_hdr = (struct _nls_msg_hdr *) ((char *)catd->__data
+ sizeof(struct _nls_cat_hdr)
+ ntohl(cat_hdr->__msg_hdr_offset));
l = ntohl(set_hdr[i].__index);
u = l + ntohl(set_hdr[i].__nmsgs) - 1;
while (l <= u) {
i = (l + u) / 2;
r = msg_id - ntohl(msg_hdr[i].__msgno);
if (r == 0) {
return (char *) catd->__data
+ sizeof(struct _nls_cat_hdr)
+ ntohl(cat_hdr->__msg_txt_offset)
+ ntohl(msg_hdr[i].__offset);
} else if (r < 0) {
u = i - 1;
} else {
l = i + 1;
}
}
/* not found */
return (char *) s;
} else if (r < 0) {
u = i - 1;
} else {
l = i + 1;
}
}
/* not found */
return (char *) s;
}
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