1 /* $NetBSD: catopen.c,v 1.12 1997/07/30 23:49:51 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 <limits.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <sys/types.h> 46 #include <sys/param.h> 47 #include <sys/stat.h> 48 #include <sys/mman.h> 49 #include <unistd.h> 50 #include <fcntl.h> 51 #include <nl_types.h> 52 53 #define NLS_DEFAULT_PATH "/usr/share/nls/%L/%N.cat:/usr/share/nls/%N/%L" 54 #define NLS_DEFAULT_LANG "C" 55 56 static nl_catd load_msgcat __P((const char *)); 57 58 nl_catd 59 _catopen(name, oflag) 60 const char *name; 61 int oflag; 62 { 63 char tmppath[PATH_MAX]; 64 char *nlspath; 65 char *lang; 66 char *s, *t; 67 const char *u; 68 nl_catd catd; 69 70 if (name == NULL || *name == '\0') 71 return (nl_catd)-1; 72 73 /* absolute or relative path? */ 74 if (strchr(name, '/')) 75 return load_msgcat(name); 76 77 /* 78 * XXX potential security problem here if this is used in a 79 * set-id program, and NLSPATH or LANG are set to read files 80 * the user normally does not have access to. 81 */ 82 if ((nlspath = getenv("NLSPATH")) == NULL) 83 nlspath = NLS_DEFAULT_PATH; 84 if ((lang = getenv("LANG")) == NULL) 85 lang = NLS_DEFAULT_LANG; 86 87 s = nlspath; 88 t = tmppath; 89 do { 90 while (*s && *s != ':') { 91 if (*s == '%') { 92 switch (*(++s)) { 93 case 'L': /* locale */ 94 u = lang; 95 while (*u && t < tmppath + PATH_MAX) 96 *t++ = *u++; 97 break; 98 case 'N': /* name */ 99 u = name; 100 while (*u && t < tmppath + PATH_MAX) 101 *t++ = *u++; 102 break; 103 case 'l': /* lang */ 104 case 't': /* territory */ 105 case 'c': /* codeset */ 106 break; 107 default: 108 if (t < tmppath + PATH_MAX) 109 *t++ = *s; 110 } 111 } else { 112 if (t < tmppath + PATH_MAX) 113 *t++ = *s; 114 } 115 s++; 116 } 117 118 *t = '\0'; 119 catd = load_msgcat(tmppath); 120 if (catd != (nl_catd)-1) 121 return catd; 122 123 if (*s) 124 s++; 125 t = tmppath; 126 } while (*s); 127 128 return (nl_catd)-1; 129 } 130 131 static nl_catd 132 load_msgcat(path) 133 const char *path; 134 { 135 struct stat st; 136 nl_catd catd; 137 void *data; 138 int fd; 139 140 if ((fd = open(path, O_RDONLY)) == -1) 141 return (nl_catd)-1; 142 143 if (fstat(fd, &st) != 0) { 144 close (fd); 145 return (nl_catd)-1; 146 } 147 148 data = mmap(0, (size_t)st.st_size, PROT_READ, MAP_SHARED, fd, 0); 149 close (fd); 150 151 if (data == (void *)-1) { 152 munmap(data, (size_t)st.st_size); 153 return (nl_catd)-1; 154 } 155 156 if (ntohl(((struct _nls_cat_hdr *)data)->__magic) != _NLS_MAGIC) { 157 munmap(data, (size_t)st.st_size); 158 return (nl_catd)-1; 159 } 160 161 if ((catd = malloc(sizeof (*catd))) == 0) { 162 munmap(data, (size_t)st.st_size); 163 return (nl_catd)-1; 164 } 165 166 catd->__data = data; 167 catd->__size = st.st_size; 168 return catd; 169 } 170