1 /* $NetBSD: catopen.c,v 1.16 1999/09/16 11:45:19 lukem 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 <sys/param.h> 43 #include <sys/stat.h> 44 #include <sys/mman.h> 45 46 #include <assert.h> 47 #include <fcntl.h> 48 #include <limits.h> 49 #include <nl_types.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <unistd.h> 53 54 #define NLS_DEFAULT_PATH "/usr/share/nls/%L/%N.cat:/usr/share/nls/%N/%L" 55 #define NLS_DEFAULT_LANG "C" 56 57 #ifdef __weak_alias 58 __weak_alias(catopen, _catopen) 59 #endif 60 61 static nl_catd load_msgcat __P((const char *)); 62 63 /* ARGSUSED */ 64 nl_catd 65 _catopen(name, oflag) 66 const char *name; 67 int oflag; 68 { 69 char tmppath[PATH_MAX]; 70 char *nlspath; 71 char *lang; 72 char *s, *t; 73 const char *u; 74 nl_catd catd; 75 76 if (name == NULL || *name == '\0') 77 return (nl_catd)-1; 78 79 /* absolute or relative path? */ 80 if (strchr(name, '/')) 81 return load_msgcat(name); 82 83 /* 84 * XXX potential security problem here if this is used in a 85 * set-id program, and NLSPATH or LANG are set to read files 86 * the user normally does not have access to. 87 */ 88 if ((nlspath = getenv("NLSPATH")) == NULL) 89 nlspath = NLS_DEFAULT_PATH; 90 if ((lang = getenv("LANG")) == NULL) 91 lang = NLS_DEFAULT_LANG; 92 93 s = nlspath; 94 t = tmppath; 95 do { 96 while (*s && *s != ':') { 97 if (*s == '%') { 98 switch (*(++s)) { 99 case 'L': /* locale */ 100 u = lang; 101 while (*u && t < tmppath + PATH_MAX) 102 *t++ = *u++; 103 break; 104 case 'N': /* name */ 105 u = name; 106 while (*u && t < tmppath + PATH_MAX) 107 *t++ = *u++; 108 break; 109 case 'l': /* lang */ 110 case 't': /* territory */ 111 case 'c': /* codeset */ 112 break; 113 default: 114 if (t < tmppath + PATH_MAX) 115 *t++ = *s; 116 } 117 } else { 118 if (t < tmppath + PATH_MAX) 119 *t++ = *s; 120 } 121 s++; 122 } 123 124 *t = '\0'; 125 catd = load_msgcat(tmppath); 126 if (catd != (nl_catd)-1) 127 return catd; 128 129 if (*s) 130 s++; 131 t = tmppath; 132 } while (*s); 133 134 return (nl_catd)-1; 135 } 136 137 static nl_catd 138 load_msgcat(path) 139 const char *path; 140 { 141 struct stat st; 142 nl_catd catd; 143 void *data; 144 int fd; 145 146 _DIAGASSERT(path != NULL); 147 148 if ((fd = open(path, O_RDONLY)) == -1) 149 return (nl_catd)-1; 150 151 if (fstat(fd, &st) != 0) { 152 close (fd); 153 return (nl_catd)-1; 154 } 155 156 data = mmap(0, (size_t)st.st_size, PROT_READ, MAP_FILE|MAP_SHARED, fd, 157 (off_t)0); 158 close (fd); 159 160 if (data == (void *)-1) { 161 munmap(data, (size_t)st.st_size); 162 return (nl_catd)-1; 163 } 164 165 if (ntohl((u_int32_t)((struct _nls_cat_hdr *)data)->__magic) != 166 _NLS_MAGIC) { 167 munmap(data, (size_t)st.st_size); 168 return (nl_catd)-1; 169 } 170 171 if ((catd = malloc(sizeof (*catd))) == 0) { 172 munmap(data, (size_t)st.st_size); 173 return (nl_catd)-1; 174 } 175 176 catd->__data = data; 177 catd->__size = (int)st.st_size; 178 return catd; 179 } 180