1 /* $NetBSD: catgets.c,v 1.18 2008/04/28 20:23:00 martin 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 1.18 2008/04/28 20:23:00 martin 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 46 __weak_alias(catgets, _catgets) 47 #endif 48 49 char * 50 _catgets(catd, set_id, msg_id, s) 51 nl_catd catd; 52 int set_id; 53 int msg_id; 54 const char *s; 55 { 56 struct _nls_cat_hdr *cat_hdr; 57 struct _nls_set_hdr *set_hdr; 58 struct _nls_msg_hdr *msg_hdr; 59 int l, u, i, r; 60 61 if (catd == (nl_catd) -1) { 62 errno = EBADF; 63 return __UNCONST(s); 64 } 65 66 cat_hdr = (struct _nls_cat_hdr *)catd->__data; 67 set_hdr = (struct _nls_set_hdr *)(void *)((char *)catd->__data 68 + sizeof(struct _nls_cat_hdr)); 69 70 /* binary search, see knuth algorithm b */ 71 l = 0; 72 u = ntohl((u_int32_t)cat_hdr->__nsets) - 1; 73 while (l <= u) { 74 i = (l + u) / 2; 75 r = set_id - ntohl((u_int32_t)set_hdr[i].__setno); 76 77 if (r == 0) { 78 msg_hdr = (struct _nls_msg_hdr *) 79 (void *)((char *)catd->__data + 80 sizeof(struct _nls_cat_hdr) + 81 ntohl((u_int32_t)cat_hdr->__msg_hdr_offset)); 82 83 l = ntohl((u_int32_t)set_hdr[i].__index); 84 u = l + ntohl((u_int32_t)set_hdr[i].__nmsgs) - 1; 85 while (l <= u) { 86 i = (l + u) / 2; 87 r = msg_id - 88 ntohl((u_int32_t)msg_hdr[i].__msgno); 89 if (r == 0) { 90 return ((char *) catd->__data + 91 sizeof(struct _nls_cat_hdr) + 92 ntohl((u_int32_t) 93 cat_hdr->__msg_txt_offset) + 94 ntohl((u_int32_t) 95 msg_hdr[i].__offset)); 96 } else if (r < 0) { 97 u = i - 1; 98 } else { 99 l = i + 1; 100 } 101 } 102 103 /* not found */ 104 goto notfound; 105 106 } else if (r < 0) { 107 u = i - 1; 108 } else { 109 l = i + 1; 110 } 111 } 112 113 notfound: 114 /* not found */ 115 errno = ENOMSG; 116 return __UNCONST(s); 117 } 118