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catopen.c revision 1.8 
      1 /*	$NetBSD: catopen.c,v 1.8 1996/06/20 18:47:08 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 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 	if ((nlspath = getenv ("NLSPATH")) == NULL) {
     77 		nlspath = NLS_DEFAULT_PATH;
     78 	}
     79 	if ((lang = getenv ("LANG")) == NULL) {
     80 		lang = NLS_DEFAULT_LANG;
     81 	}
     82 
     83 	s = nlspath;
     84 	t = tmppath;
     85 	do {
     86 		while (*s && *s != ':') {
     87 			if (*s == '%') {
     88 				switch (*(++s)) {
     89 				case 'L':	/* locale */
     90 					u = lang;
     91 					while (*u && t < tmppath + PATH_MAX)
     92 						*t++ = *u++;
     93 					s++;
     94 					break;
     95 				case 'N':	/* name */
     96 					u = name;
     97 					while (*u && t < tmppath + PATH_MAX)
     98 						*t++ = *u++;
     99 					s++;
    100 					break;
    101 				case 'l':	/* lang */
    102 				case 't':	/* territory */
    103 				case 'c':	/* codeset */
    104 					s++;
    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 		}
    115 
    116 		*t = '\0';
    117 		catd = load_msgcat(tmppath);
    118 		if (catd != (nl_catd) 0)
    119 			return catd;
    120 
    121 		s++;
    122 		t = tmppath;
    123 	} while (*s);
    124 
    125 	return (nl_catd) 0;
    126 }
    127 
    128 static nl_catd
    129 load_msgcat(path)
    130 	const char *path;
    131 {
    132 	struct _nls_cat_hdr *cat_hdr;
    133 	struct stat st;
    134 	nl_catd catd;
    135 	int fd;
    136 
    137 	if ((fd = open (path, O_RDONLY)) == -1)
    138 		return (nl_catd) 0;
    139 
    140 	if (fstat(fd, &st) != 0) {
    141 		close (fd);
    142 		return (nl_catd) 0;
    143 	}
    144 
    145 	if ((catd = malloc (sizeof (*catd))) == 0) {
    146 		close (fd);
    147 		return (nl_catd) 0;
    148 	}
    149 
    150 	catd->__data = mmap(0, (size_t) st.st_size, PROT_READ, MAP_SHARED, fd, 0);
    151 	close (fd);
    152 
    153 	if (catd->__data == (void *) -1) {
    154 		free (catd);
    155 		return (nl_catd) 0;
    156 	}
    157 	catd->__size = st.st_size;
    158 
    159 	cat_hdr = (struct _nls_cat_hdr *) catd->__data;
    160 	if (ntohl(cat_hdr->__magic) != _NLS_MAGIC) {
    161 		free (catd);
    162 		close (fd);
    163 		return (nl_catd) 0;
    164 	}
    165 
    166 	return catd;
    167 }
    168