1 /* $NetBSD: catgets.c,v 1.19 2012/06/25 22:32:45 abs Exp $ */
2
3 /*-
4 * Copyright (c) 1996 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by J.T. Conklin.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #if defined(LIBC_SCCS) && !defined(lint)
34 __RCSID("$NetBSD: catgets.c,v 1.19 2012/06/25 22:32:45 abs Exp $");
35 #endif /* LIBC_SCCS and not lint */
36
37 #define _NLS_PRIVATE
38
39 #include "namespace.h"
40 #include <errno.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <nl_types.h>
44
45 #ifdef __weak_alias
__weak_alias(catgets,_catgets)46 __weak_alias(catgets, _catgets)
47 #endif
48
49 char *
50 _catgets(nl_catd catd, int set_id, int msg_id, const char *s)
51 {
52 struct _nls_cat_hdr *cat_hdr;
53 struct _nls_set_hdr *set_hdr;
54 struct _nls_msg_hdr *msg_hdr;
55 int l, u, i, r;
56
57 if (catd == (nl_catd) -1) {
58 errno = EBADF;
59 return __UNCONST(s);
60 }
61
62 cat_hdr = (struct _nls_cat_hdr *)catd->__data;
63 set_hdr = (struct _nls_set_hdr *)(void *)((char *)catd->__data
64 + sizeof(struct _nls_cat_hdr));
65
66 /* binary search, see knuth algorithm b */
67 l = 0;
68 u = ntohl((u_int32_t)cat_hdr->__nsets) - 1;
69 while (l <= u) {
70 i = (l + u) / 2;
71 r = set_id - ntohl((u_int32_t)set_hdr[i].__setno);
72
73 if (r == 0) {
74 msg_hdr = (struct _nls_msg_hdr *)
75 (void *)((char *)catd->__data +
76 sizeof(struct _nls_cat_hdr) +
77 ntohl((u_int32_t)cat_hdr->__msg_hdr_offset));
78
79 l = ntohl((u_int32_t)set_hdr[i].__index);
80 u = l + ntohl((u_int32_t)set_hdr[i].__nmsgs) - 1;
81 while (l <= u) {
82 i = (l + u) / 2;
83 r = msg_id -
84 ntohl((u_int32_t)msg_hdr[i].__msgno);
85 if (r == 0) {
86 return ((char *) catd->__data +
87 sizeof(struct _nls_cat_hdr) +
88 ntohl((u_int32_t)
89 cat_hdr->__msg_txt_offset) +
90 ntohl((u_int32_t)
91 msg_hdr[i].__offset));
92 } else if (r < 0) {
93 u = i - 1;
94 } else {
95 l = i + 1;
96 }
97 }
98
99 /* not found */
100 goto notfound;
101
102 } else if (r < 0) {
103 u = i - 1;
104 } else {
105 l = i + 1;
106 }
107 }
108
109 notfound:
110 /* not found */
111 errno = ENOMSG;
112 return __UNCONST(s);
113 }
114