1 /* $NetBSD: catgets.c,v 1.17 2005/11/29 03:12:00 christos 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #if defined(LIBC_SCCS) && !defined(lint) 41 __RCSID("$NetBSD: catgets.c,v 1.17 2005/11/29 03:12:00 christos Exp $"); 42 #endif /* LIBC_SCCS and not lint */ 43 44 #define _NLS_PRIVATE 45 46 #include "namespace.h" 47 #include <errno.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <nl_types.h> 51 52 #ifdef __weak_alias 53 __weak_alias(catgets, _catgets) 54 #endif 55 56 char * 57 _catgets(catd, set_id, msg_id, s) 58 nl_catd catd; 59 int set_id; 60 int msg_id; 61 const char *s; 62 { 63 struct _nls_cat_hdr *cat_hdr; 64 struct _nls_set_hdr *set_hdr; 65 struct _nls_msg_hdr *msg_hdr; 66 int l, u, i, r; 67 68 if (catd == (nl_catd) -1) { 69 errno = EBADF; 70 return __UNCONST(s); 71 } 72 73 cat_hdr = (struct _nls_cat_hdr *)catd->__data; 74 set_hdr = (struct _nls_set_hdr *)(void *)((char *)catd->__data 75 + sizeof(struct _nls_cat_hdr)); 76 77 /* binary search, see knuth algorithm b */ 78 l = 0; 79 u = ntohl((u_int32_t)cat_hdr->__nsets) - 1; 80 while (l <= u) { 81 i = (l + u) / 2; 82 r = set_id - ntohl((u_int32_t)set_hdr[i].__setno); 83 84 if (r == 0) { 85 msg_hdr = (struct _nls_msg_hdr *) 86 (void *)((char *)catd->__data + 87 sizeof(struct _nls_cat_hdr) + 88 ntohl((u_int32_t)cat_hdr->__msg_hdr_offset)); 89 90 l = ntohl((u_int32_t)set_hdr[i].__index); 91 u = l + ntohl((u_int32_t)set_hdr[i].__nmsgs) - 1; 92 while (l <= u) { 93 i = (l + u) / 2; 94 r = msg_id - 95 ntohl((u_int32_t)msg_hdr[i].__msgno); 96 if (r == 0) { 97 return ((char *) catd->__data + 98 sizeof(struct _nls_cat_hdr) + 99 ntohl((u_int32_t) 100 cat_hdr->__msg_txt_offset) + 101 ntohl((u_int32_t) 102 msg_hdr[i].__offset)); 103 } else if (r < 0) { 104 u = i - 1; 105 } else { 106 l = i + 1; 107 } 108 } 109 110 /* not found */ 111 goto notfound; 112 113 } else if (r < 0) { 114 u = i - 1; 115 } else { 116 l = i + 1; 117 } 118 } 119 120 notfound: 121 /* not found */ 122 errno = ENOMSG; 123 return __UNCONST(s); 124 } 125