1 /* $NetBSD: catgets.c,v 1.8 1996/05/13 23:29:38 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 REGENTS OR CONTRIBUTORS BE 30 * 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 <stdlib.h> 42 #include <string.h> 43 #include <nl_types.h> 44 45 char * 46 _catgets(catd, set_id, msg_id, s) 47 nl_catd catd; 48 int set_id; 49 int msg_id; 50 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) 0 || catd == (nl_catd) -1) { 58 return (char *) s; 59 } 60 61 cat_hdr = (struct _nls_cat_hdr *) catd->__data; 62 set_hdr = (struct _nls_set_hdr *) (catd->__data 63 + sizeof(struct _nls_cat_hdr)); 64 65 /* binary search, see knuth algorithm b */ 66 l = 0; 67 u = ntohl(cat_hdr->__nsets) - 1; 68 while (l <= u) { 69 i = (l + u) / 2; 70 r = set_id - ntohl(set_hdr[i].__setno); 71 72 if (r == 0) { 73 msg_hdr = (struct _nls_msg_hdr *) (catd->__data 74 + sizeof(struct _nls_cat_hdr) 75 + ntohl(cat_hdr->__msg_hdr_offset)); 76 77 l = ntohl(set_hdr[i].__index); 78 u = l + ntohl(set_hdr[i].__nmsgs) - 1; 79 while (l <= u) { 80 i = (l + u) / 2; 81 r = msg_id - ntohl(msg_hdr[i].__msgno); 82 if (r == 0) { 83 return (char *) (catd->__data 84 + sizeof(struct _nls_cat_hdr) 85 + ntohl(cat_hdr->__msg_txt_offset) 86 + ntohl(msg_hdr[i].__offset)); 87 } else if (r < 0) { 88 u = i - 1; 89 } else { 90 l = i + 1; 91 } 92 } 93 94 /* not found */ 95 return (char *) s; 96 97 } else if (r < 0) { 98 u = i - 1; 99 } else { 100 l = i + 1; 101 } 102 } 103 104 /* not found */ 105 return (char *) s; 106 } 107