Home | History | Annotate | Line # | Download | only in nls
catopen.c revision 1.6 
      1 /*	$NetBSD: catopen.c,v 1.6 1996/05/13 23:29:39 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 nl_catd
     56 _catopen(name, oflag)
     57 	const char *name;
     58 	int oflag;
     59 {
     60 	const char *path;
     61 	struct stat st;
     62 	nl_catd catd;
     63 	int fd;
     64 
     65 	struct _nls_cat_hdr *cat_hdr;
     66 
     67 	if (name == NULL || *name == '\0')
     68 		return (nl_catd) -1;
     69 
     70 	/* absolute or relative path? */
     71 	if (strchr (name, '/')) {
     72 		if (stat (name, &st)) {
     73 			return (nl_catd) 0;
     74 		}
     75 		path = name;
     76 	} else {
     77 		char tmppath[PATH_MAX];
     78 		char *nlspath;
     79 		char *lang;
     80 		char *s, *t;
     81 
     82 		if ((nlspath = getenv ("NLSPATH")) == NULL) {
     83 			nlspath = NLS_DEFAULT_PATH;
     84 		}
     85 		if ((lang = getenv ("LANG")) == NULL) {
     86 			lang = NLS_DEFAULT_LANG;
     87 		}
     88 
     89 		for (s = nlspath, t = tmppath; *s; ) {
     90 			if (*s == '%') {
     91 				if (*(s + 1) == 'L') {
     92 					strcpy(t, lang);
     93 					t += strlen(lang);
     94 					s += 2;
     95 				} else if (*(s + 1) == 'N') {
     96 					strcpy(t, name);
     97 					t += strlen(name);
     98 					s += 2;
     99 				} else {
    100 					*t++ = *s++;
    101 				}
    102 			} else if (*s == ':') {
    103 				*t = '\0';
    104 
    105 				if (stat (tmppath, &st) == 0) {
    106 					path = tmppath;
    107 					goto load_msgcat;
    108 				}
    109 
    110 				t = tmppath;
    111 			} else {
    112 				*t++ = *s++;
    113 			}
    114 		}
    115 
    116 		return (nl_catd) 0;
    117 	}
    118 
    119 load_msgcat:
    120 	if ((fd = open (path, O_RDONLY)) == -1)
    121 		return (nl_catd) 0;
    122 
    123 	if (fstat(fd, &st) != 0) {
    124 		close (fd);
    125 		return (nl_catd) 0;
    126 	}
    127 
    128 	if ((catd = malloc (sizeof (*catd))) == 0) {
    129 		close (fd);
    130 		return (nl_catd) 0;
    131 	}
    132 
    133 	catd->__data = mmap(0, (size_t) st.st_size, PROT_READ, MAP_SHARED, fd, 0);
    134 	close (fd);
    135 
    136 	if (catd->__data == (void *) -1) {
    137 		free (catd);
    138 		return (nl_catd) 0;
    139 	}
    140 	catd->__size = st.st_size;
    141 
    142 	cat_hdr = (struct _nls_cat_hdr *) catd->__data;
    143 	if (ntohl(cat_hdr->__magic) != _NLS_MAGIC) {
    144 		free (catd);
    145 		close (fd);
    146 		return (nl_catd) 0;
    147 	}
    148 
    149 	return catd;
    150 }
    151