1 /* $OpenBSD: catgets.c,v 1.9 2015/09/05 11:25:30 guenther Exp $ */ 2 /*- 3 * Copyright (c) 1996 The NetBSD Foundation, Inc. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to The NetBSD Foundation 7 * by J.T. Conklin. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #define _NLS_PRIVATE 32 33 #include <errno.h> 34 #include <stdlib.h> 35 #include <string.h> 36 #include <nl_types.h> 37 38 char * 39 catgets(nl_catd catd, int set_id, int msg_id, const char *s) 40 { 41 struct _nls_cat_hdr *cat_hdr; 42 struct _nls_set_hdr *set_hdr; 43 struct _nls_msg_hdr *msg_hdr; 44 int l, u, i, r; 45 46 if (catd == (nl_catd) -1) { 47 errno = EBADF; 48 return (char *) s; 49 } 50 51 cat_hdr = (struct _nls_cat_hdr *) catd->__data; 52 set_hdr = (struct _nls_set_hdr *) ((char *)catd->__data 53 + sizeof(struct _nls_cat_hdr)); 54 55 /* binary search, see knuth algorithm b */ 56 l = 0; 57 u = ntohl(cat_hdr->__nsets) - 1; 58 while (l <= u) { 59 i = (l + u) / 2; 60 r = set_id - ntohl(set_hdr[i].__setno); 61 62 if (r == 0) { 63 msg_hdr = (struct _nls_msg_hdr *) ((char *)catd->__data 64 + sizeof(struct _nls_cat_hdr) 65 + ntohl(cat_hdr->__msg_hdr_offset)); 66 67 l = ntohl(set_hdr[i].__index); 68 u = l + ntohl(set_hdr[i].__nmsgs) - 1; 69 while (l <= u) { 70 i = (l + u) / 2; 71 r = msg_id - ntohl(msg_hdr[i].__msgno); 72 if (r == 0) { 73 return (char *) catd->__data 74 + sizeof(struct _nls_cat_hdr) 75 + ntohl(cat_hdr->__msg_txt_offset) 76 + ntohl(msg_hdr[i].__offset); 77 } else if (r < 0) { 78 u = i - 1; 79 } else { 80 l = i + 1; 81 } 82 } 83 84 /* not found */ 85 return (char *) s; 86 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 DEF_WEAK(catgets); 98