1 /* $NetBSD: catgets.c,v 1.15 1999/08/17 04:00:51 mycroft 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 #define _NLS_PRIVATE 40 41 #include "namespace.h" 42 #include <errno.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <nl_types.h> 46 47 #ifdef __weak_alias 48 __weak_alias(catgets, _catgets) 49 #endif 50 51 char * 52 _catgets(catd, set_id, msg_id, s) 53 nl_catd catd; 54 int set_id; 55 int msg_id; 56 const char *s; 57 { 58 struct _nls_cat_hdr *cat_hdr; 59 struct _nls_set_hdr *set_hdr; 60 struct _nls_msg_hdr *msg_hdr; 61 int l, u, i, r; 62 63 if (catd == (nl_catd) -1) { 64 errno = EBADF; 65 /* LINTED interface problem */ 66 return (char *) s; 67 } 68 69 cat_hdr = (struct _nls_cat_hdr *)catd->__data; 70 set_hdr = (struct _nls_set_hdr *)(void *)((char *)catd->__data 71 + sizeof(struct _nls_cat_hdr)); 72 73 /* binary search, see knuth algorithm b */ 74 l = 0; 75 u = ntohl((u_int32_t)cat_hdr->__nsets) - 1; 76 while (l <= u) { 77 i = (l + u) / 2; 78 r = set_id - ntohl((u_int32_t)set_hdr[i].__setno); 79 80 if (r == 0) { 81 msg_hdr = (struct _nls_msg_hdr *) 82 (void *)((char *)catd->__data + 83 sizeof(struct _nls_cat_hdr) + 84 ntohl((u_int32_t)cat_hdr->__msg_hdr_offset)); 85 86 l = ntohl((u_int32_t)set_hdr[i].__index); 87 u = l + ntohl((u_int32_t)set_hdr[i].__nmsgs) - 1; 88 while (l <= u) { 89 i = (l + u) / 2; 90 r = msg_id - 91 ntohl((u_int32_t)msg_hdr[i].__msgno); 92 if (r == 0) { 93 return ((char *) catd->__data + 94 sizeof(struct _nls_cat_hdr) + 95 ntohl((u_int32_t) 96 cat_hdr->__msg_txt_offset) + 97 ntohl((u_int32_t) 98 msg_hdr[i].__offset)); 99 } else if (r < 0) { 100 u = i - 1; 101 } else { 102 l = i + 1; 103 } 104 } 105 106 /* not found */ 107 goto notfound; 108 109 } else if (r < 0) { 110 u = i - 1; 111 } else { 112 l = i + 1; 113 } 114 } 115 116 notfound: 117 /* not found */ 118 errno = ENOMSG; 119 /* LINTED interface problem */ 120 return (char *) s; 121 } 122