NetBSD/lib/libc/nls/catgets.c

118 lines
3.3 KiB
C

/* $NetBSD: catgets.c,v 1.18 2008/04/28 20:23:00 martin 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 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.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: catgets.c,v 1.18 2008/04/28 20:23:00 martin Exp $");
#endif /* LIBC_SCCS and not lint */
#define _NLS_PRIVATE
#include "namespace.h"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <nl_types.h>
#ifdef __weak_alias
__weak_alias(catgets, _catgets)
#endif
char *
_catgets(catd, set_id, msg_id, s)
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 __UNCONST(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((u_int32_t)cat_hdr->__nsets) - 1;
while (l <= u) {
i = (l + u) / 2;
r = set_id - ntohl((u_int32_t)set_hdr[i].__setno);
if (r == 0) {
msg_hdr = (struct _nls_msg_hdr *)
(void *)((char *)catd->__data +
sizeof(struct _nls_cat_hdr) +
ntohl((u_int32_t)cat_hdr->__msg_hdr_offset));
l = ntohl((u_int32_t)set_hdr[i].__index);
u = l + ntohl((u_int32_t)set_hdr[i].__nmsgs) - 1;
while (l <= u) {
i = (l + u) / 2;
r = msg_id -
ntohl((u_int32_t)msg_hdr[i].__msgno);
if (r == 0) {
return ((char *) catd->__data +
sizeof(struct _nls_cat_hdr) +
ntohl((u_int32_t)
cat_hdr->__msg_txt_offset) +
ntohl((u_int32_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;
return __UNCONST(s);
}