1 /* $NetBSD: catopen.c,v 1.10 1997/04/22 12:28:01 mrg 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 <limits.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <sys/types.h> 45 #include <sys/param.h> 46 #include <sys/stat.h> 47 #include <sys/mman.h> 48 #include <unistd.h> 49 #include <fcntl.h> 50 #include <nl_types.h> 51 52 #define NLS_DEFAULT_PATH "/usr/share/nls/%L/%N.cat:/usr/share/nls/%N/%L" 53 #define NLS_DEFAULT_LANG "C" 54 55 static nl_catd load_msgcat(); 56 57 nl_catd 58 _catopen(name, oflag) 59 const char *name; 60 int oflag; 61 { 62 char tmppath[PATH_MAX]; 63 char *nlspath; 64 char *lang; 65 char *s, *t; 66 const char *u; 67 nl_catd catd; 68 69 if (name == NULL || *name == '\0') 70 return (nl_catd)-1; 71 72 /* absolute or relative path? */ 73 if (strchr(name, '/')) 74 return load_msgcat(name); 75 76 /* 77 * XXX potential security problem here if this is used in a 78 * set-id program, and NLSPATH or LANG are set to read files 79 * the user normally does not have access to. 80 */ 81 if ((nlspath = getenv("NLSPATH")) == NULL) 82 nlspath = NLS_DEFAULT_PATH; 83 if ((lang = getenv("LANG")) == NULL) 84 lang = NLS_DEFAULT_LANG; 85 86 s = nlspath; 87 t = tmppath; 88 do { 89 while (*s && *s != ':') { 90 if (*s == '%') { 91 switch (*(++s)) { 92 case 'L': /* locale */ 93 u = lang; 94 while (*u && t < tmppath + PATH_MAX) 95 *t++ = *u++; 96 break; 97 case 'N': /* name */ 98 u = name; 99 while (*u && t < tmppath + PATH_MAX) 100 *t++ = *u++; 101 break; 102 case 'l': /* lang */ 103 case 't': /* territory */ 104 case 'c': /* codeset */ 105 break; 106 default: 107 if (t < tmppath + PATH_MAX) 108 *t++ = *s; 109 } 110 } else { 111 if (t < tmppath + PATH_MAX) 112 *t++ = *s; 113 } 114 s++; 115 } 116 117 *t = '\0'; 118 catd = load_msgcat(tmppath); 119 if (catd != (nl_catd)-1) 120 return catd; 121 122 if (*s) 123 s++; 124 t = tmppath; 125 } while (*s); 126 127 return (nl_catd)-1; 128 } 129 130 static nl_catd 131 load_msgcat(path) 132 const char *path; 133 { 134 struct stat st; 135 nl_catd catd; 136 void *data; 137 int fd; 138 139 if ((fd = open(path, O_RDONLY)) == -1) 140 return (nl_catd)-1; 141 142 if (fstat(fd, &st) != 0) { 143 close (fd); 144 return (nl_catd)-1; 145 } 146 147 data = mmap(0, (size_t)st.st_size, PROT_READ, MAP_SHARED, fd, 0); 148 close (fd); 149 150 if (data == (void *)-1) { 151 munmap(data, (size_t)st.st_size); 152 return (nl_catd)-1; 153 } 154 155 if (ntohl(((struct _nls_cat_hdr *)data)->__magic) != _NLS_MAGIC) { 156 munmap(data, (size_t)st.st_size); 157 return (nl_catd)-1; 158 } 159 160 if ((catd = malloc(sizeof (*catd))) == 0) { 161 munmap(data, (size_t)st.st_size); 162 return (nl_catd)-1; 163 } 164 165 catd->__data = data; 166 catd->__size = st.st_size; 167 return catd; 168 } 169