1 /* $NetBSD: catgets.c,v 1.10 1997/06/19 07:41:32 mikel 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 <errno.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <nl_types.h> 45 46 char * 47 _catgets(catd, set_id, msg_id, s) 48 nl_catd catd; 49 int set_id; 50 int msg_id; 51 const char *s; 52 { 53 struct _nls_cat_hdr *cat_hdr; 54 struct _nls_set_hdr *set_hdr; 55 struct _nls_msg_hdr *msg_hdr; 56 int l, u, i, r; 57 58 if (catd == (nl_catd) -1) { 59 errno = EBADF; 60 return (char *) s; 61 } 62 63 cat_hdr = (struct _nls_cat_hdr *) catd->__data; 64 set_hdr = (struct _nls_set_hdr *) ((char *) catd->__data 65 + sizeof(struct _nls_cat_hdr)); 66 67 /* binary search, see knuth algorithm b */ 68 l = 0; 69 u = ntohl(cat_hdr->__nsets) - 1; 70 while (l <= u) { 71 i = (l + u) / 2; 72 r = set_id - ntohl(set_hdr[i].__setno); 73 74 if (r == 0) { 75 msg_hdr = (struct _nls_msg_hdr *) ((char *)catd->__data 76 + sizeof(struct _nls_cat_hdr) 77 + ntohl(cat_hdr->__msg_hdr_offset)); 78 79 l = ntohl(set_hdr[i].__index); 80 u = l + ntohl(set_hdr[i].__nmsgs) - 1; 81 while (l <= u) { 82 i = (l + u) / 2; 83 r = msg_id - ntohl(msg_hdr[i].__msgno); 84 if (r == 0) { 85 return ((char *) catd->__data 86 + sizeof(struct _nls_cat_hdr) 87 + ntohl(cat_hdr->__msg_txt_offset) 88 + ntohl(msg_hdr[i].__offset)); 89 } else if (r < 0) { 90 u = i - 1; 91 } else { 92 l = i + 1; 93 } 94 } 95 96 /* not found */ 97 return (char *) s; 98 99 } else if (r < 0) { 100 u = i - 1; 101 } else { 102 l = i + 1; 103 } 104 } 105 106 /* not found */ 107 return (char *) s; 108 } 109