1 /* $NetBSD: catgets.c,v 1.12 1997/07/30 23:49:48 jtc 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 char * 48 _catgets(catd, set_id, msg_id, s) 49 nl_catd catd; 50 int set_id; 51 int msg_id; 52 const char *s; 53 { 54 struct _nls_cat_hdr *cat_hdr; 55 struct _nls_set_hdr *set_hdr; 56 struct _nls_msg_hdr *msg_hdr; 57 int l, u, i, r; 58 59 if (catd == (nl_catd) -1) { 60 errno = EBADF; 61 return (char *) s; 62 } 63 64 cat_hdr = (struct _nls_cat_hdr *) catd->__data; 65 set_hdr = (struct _nls_set_hdr *) ((char *) catd->__data 66 + sizeof(struct _nls_cat_hdr)); 67 68 /* binary search, see knuth algorithm b */ 69 l = 0; 70 u = ntohl(cat_hdr->__nsets) - 1; 71 while (l <= u) { 72 i = (l + u) / 2; 73 r = set_id - ntohl(set_hdr[i].__setno); 74 75 if (r == 0) { 76 msg_hdr = (struct _nls_msg_hdr *) ((char *)catd->__data 77 + sizeof(struct _nls_cat_hdr) 78 + ntohl(cat_hdr->__msg_hdr_offset)); 79 80 l = ntohl(set_hdr[i].__index); 81 u = l + ntohl(set_hdr[i].__nmsgs) - 1; 82 while (l <= u) { 83 i = (l + u) / 2; 84 r = msg_id - ntohl(msg_hdr[i].__msgno); 85 if (r == 0) { 86 return ((char *) catd->__data 87 + sizeof(struct _nls_cat_hdr) 88 + ntohl(cat_hdr->__msg_txt_offset) 89 + ntohl(msg_hdr[i].__offset)); 90 } else if (r < 0) { 91 u = i - 1; 92 } else { 93 l = i + 1; 94 } 95 } 96 97 /* not found */ 98 return (char *) s; 99 100 } else if (r < 0) { 101 u = i - 1; 102 } else { 103 l = i + 1; 104 } 105 } 106 107 /* not found */ 108 return (char *) s; 109 } 110