1 /* $NetBSD: catopen.c,v 1.14 1998/11/15 17:42:36 christos 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 /* ARGSUSED */ 59 nl_catd 60 _catopen(name, oflag) 61 const char *name; 62 int oflag; 63 { 64 char tmppath[PATH_MAX]; 65 char *nlspath; 66 char *lang; 67 char *s, *t; 68 const char *u; 69 nl_catd catd; 70 71 if (name == NULL || *name == '\0') 72 return (nl_catd)-1; 73 74 /* absolute or relative path? */ 75 if (strchr(name, '/')) 76 return load_msgcat(name); 77 78 /* 79 * XXX potential security problem here if this is used in a 80 * set-id program, and NLSPATH or LANG are set to read files 81 * the user normally does not have access to. 82 */ 83 if ((nlspath = getenv("NLSPATH")) == NULL) 84 nlspath = NLS_DEFAULT_PATH; 85 if ((lang = getenv("LANG")) == NULL) 86 lang = NLS_DEFAULT_LANG; 87 88 s = nlspath; 89 t = tmppath; 90 do { 91 while (*s && *s != ':') { 92 if (*s == '%') { 93 switch (*(++s)) { 94 case 'L': /* locale */ 95 u = lang; 96 while (*u && t < tmppath + PATH_MAX) 97 *t++ = *u++; 98 break; 99 case 'N': /* name */ 100 u = name; 101 while (*u && t < tmppath + PATH_MAX) 102 *t++ = *u++; 103 break; 104 case 'l': /* lang */ 105 case 't': /* territory */ 106 case 'c': /* codeset */ 107 break; 108 default: 109 if (t < tmppath + PATH_MAX) 110 *t++ = *s; 111 } 112 } else { 113 if (t < tmppath + PATH_MAX) 114 *t++ = *s; 115 } 116 s++; 117 } 118 119 *t = '\0'; 120 catd = load_msgcat(tmppath); 121 if (catd != (nl_catd)-1) 122 return catd; 123 124 if (*s) 125 s++; 126 t = tmppath; 127 } while (*s); 128 129 return (nl_catd)-1; 130 } 131 132 static nl_catd 133 load_msgcat(path) 134 const char *path; 135 { 136 struct stat st; 137 nl_catd catd; 138 void *data; 139 int fd; 140 141 if ((fd = open(path, O_RDONLY)) == -1) 142 return (nl_catd)-1; 143 144 if (fstat(fd, &st) != 0) { 145 close (fd); 146 return (nl_catd)-1; 147 } 148 149 data = mmap(0, (size_t)st.st_size, PROT_READ, MAP_FILE|MAP_SHARED, fd, 150 (off_t)0); 151 close (fd); 152 153 if (data == (void *)-1) { 154 munmap(data, (size_t)st.st_size); 155 return (nl_catd)-1; 156 } 157 158 if (ntohl((u_int32_t)((struct _nls_cat_hdr *)data)->__magic) != 159 _NLS_MAGIC) { 160 munmap(data, (size_t)st.st_size); 161 return (nl_catd)-1; 162 } 163 164 if ((catd = malloc(sizeof (*catd))) == 0) { 165 munmap(data, (size_t)st.st_size); 166 return (nl_catd)-1; 167 } 168 169 catd->__data = data; 170 catd->__size = (int)st.st_size; 171 return catd; 172 } 173