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 49char * 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 109notfound: 110 /* not found */ 111 errno = ENOMSG; 112 return __UNCONST(s); 113} 114