xref: /freebsd/bin/setfacl/file.c (revision f3c5273d315a64826d2149ac453ff8c4583ddbe8)
1 /*-
2  * Copyright (c) 2001 Chris D. Faulhaber
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26 
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29 
30 #include <sys/types.h>
31 #include <sys/acl.h>
32 
33 #include <err.h>
34 #include <stdio.h>
35 #include <string.h>
36 
37 #include "setfacl.h"
38 
39 /*
40  * read acl text from a file and return the corresponding acl
41  */
42 acl_t
43 get_acl_from_file(const char *filename)
44 {
45 	FILE *file;
46 	size_t len;
47 	char buf[BUFSIZ+1];
48 
49 	if (filename == NULL)
50 		err(1, "(null) filename in get_acl_from_file()");
51 
52 	if (strcmp(filename, "-") == 0) {
53 		if (have_stdin)
54 			err(1, "cannot specify more than one stdin");
55 		file = stdin;
56 		have_stdin = true;
57 	} else {
58 		file = fopen(filename, "r");
59 		if (file == NULL)
60 			err(1, "fopen() %s failed", filename);
61 	}
62 
63 	len = fread(buf, (size_t)1, sizeof(buf) - 1, file);
64 	buf[len] = '\0';
65 	if (ferror(file) != 0) {
66 		fclose(file);
67 		err(1, "error reading from %s", filename);
68 	} else if (feof(file) == 0) {
69 		fclose(file);
70 		errx(1, "line too long in %s", filename);
71 	}
72 
73 	fclose(file);
74 
75 	return (acl_from_text(buf));
76 }
77