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1 | /* |
2 | * Copyright (c) 2003 Apple Computer, Inc. All rights reserved. | |
3 | * | |
4 | * @APPLE_LICENSE_HEADER_START@ | |
5 | * | |
9385eb3d A |
6 | * This file contains Original Code and/or Modifications of Original Code |
7 | * as defined in and that are subject to the Apple Public Source License | |
8 | * Version 2.0 (the 'License'). You may not use this file except in | |
9 | * compliance with the License. Please obtain a copy of the License at | |
10 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
11 | * file. | |
12 | * | |
13 | * The Original Code and all software distributed under the License are | |
14 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
17 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. | |
18 | * Please see the License for the specific language governing rights and | |
19 | * limitations under the License. | |
20 | * | |
21 | * @APPLE_LICENSE_HEADER_END@ | |
22 | */ | |
23 | /* $OpenBSD: opendev.c,v 1.7 2002/06/09 22:18:43 fgsch Exp $ */ | |
24 | ||
25 | /* | |
26 | * Copyright (c) 2000, Todd C. Miller. All rights reserved. | |
27 | * Copyright (c) 1996, Jason Downs. All rights reserved. | |
28 | * | |
29 | * Redistribution and use in source and binary forms, with or without | |
30 | * modification, are permitted provided that the following conditions | |
31 | * are met: | |
32 | * 1. Redistributions of source code must retain the above copyright | |
33 | * notice, this list of conditions and the following disclaimer. | |
34 | * 2. Redistributions in binary form must reproduce the above copyright | |
35 | * notice, this list of conditions and the following disclaimer in the | |
36 | * documentation and/or other materials provided with the distribution. | |
37 | * | |
38 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS | |
39 | * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
40 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
41 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, | |
42 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
43 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
44 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | |
45 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
46 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
47 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
48 | * SUCH DAMAGE. | |
49 | */ | |
50 | ||
51 | #include <ctype.h> | |
52 | #include <errno.h> | |
53 | #include <fcntl.h> | |
54 | #include <limits.h> | |
55 | #include <paths.h> | |
56 | #include <stdio.h> | |
57 | #include <string.h> | |
58 | ||
59 | #include "util.h" | |
60 | ||
61 | int | |
62 | opendev(path, oflags, dflags, realpath) | |
63 | char *path; | |
64 | int oflags; | |
65 | int dflags; | |
66 | char **realpath; | |
67 | { | |
68 | int fd; | |
69 | char *slash, *prefix; | |
70 | static char namebuf[PATH_MAX]; | |
71 | ||
72 | /* Initial state */ | |
73 | if (realpath) | |
74 | *realpath = path; | |
75 | fd = -1; | |
76 | errno = ENOENT; | |
77 | ||
78 | if (dflags & OPENDEV_BLCK) | |
79 | prefix = ""; /* block device */ | |
80 | else | |
81 | prefix = "r"; /* character device */ | |
82 | ||
83 | if ((slash = strchr(path, '/'))) | |
84 | fd = open(path, oflags); | |
85 | else if (dflags & OPENDEV_PART) { | |
86 | if (snprintf(namebuf, sizeof(namebuf), "%s%s%s", | |
87 | _PATH_DEV, prefix, path) < sizeof(namebuf)) { | |
88 | char *slice; | |
89 | while ((slice = strrchr(namebuf, 's')) && | |
90 | isdigit(*(slice-1))) *slice = '\0'; | |
91 | fd = open(namebuf, oflags); | |
92 | if (realpath) | |
93 | *realpath = namebuf; | |
94 | } else | |
95 | errno = ENAMETOOLONG; | |
96 | } | |
97 | if (!slash && fd == -1 && errno == ENOENT) { | |
98 | if (snprintf(namebuf, sizeof(namebuf), "%s%s%s", | |
99 | _PATH_DEV, prefix, path) < sizeof(namebuf)) { | |
100 | fd = open(namebuf, oflags); | |
101 | if (realpath) | |
102 | *realpath = namebuf; | |
103 | } else | |
104 | errno = ENAMETOOLONG; | |
105 | } | |
106 | return (fd); | |
107 | } |