1 /**
2 @file
3
4 @ingroup util
5
6 @brief Tilde expansion.
7
8 @copyright@parblock
9 Copyright (c) 1994-1998 The Regents of the Univ. of California.
10 All rights reserved.
11
12 Permission is hereby granted, without written agreement and without license
13 or royalty fees, to use, copy, modify, and distribute this software and its
14 documentation for any purpose, provided that the above copyright notice and
15 the following two paragraphs appear in all copies of this software.
16
17 IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
18 DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
19 OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
20 CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
21
22 THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
23 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
24 FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN
25 "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO PROVIDE
26 MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
27 @endparblock
28
29 @copyright@parblock
30 Copyright (c) 1999-2015, Regents of the University of Colorado
31
32 All rights reserved.
33
34 Redistribution and use in source and binary forms, with or without
35 modification, are permitted provided that the following conditions
36 are met:
37
38 Redistributions of source code must retain the above copyright
39 notice, this list of conditions and the following disclaimer.
40
41 Redistributions in binary form must reproduce the above copyright
42 notice, this list of conditions and the following disclaimer in the
43 documentation and/or other materials provided with the distribution.
44
45 Neither the name of the University of Colorado nor the names of its
46 contributors may be used to endorse or promote products derived from
47 this software without specific prior written permission.
48
49 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
50 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
51 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
52 FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
53 COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
54 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
55 BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
56 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
57 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
59 ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
60 POSSIBILITY OF SUCH DAMAGE.
61 @endparblock
62
63 */
64
65 #include "util.h"
66
67 #ifdef BSD
68 #include <pwd.h>
69 #endif
70
71 /**
72 * @brief Expands tilde in a file name
73 */
74 char *
util_tilde_expand(char const * fname)75 util_tilde_expand(char const *fname)
76 {
77 #ifdef BSD
78 struct passwd *userRecord;
79 char username[256], *filename;
80 register int i, j;
81
82 filename = ALLOC(char, strlen(fname) + 256);
83
84 /* Clear the return string */
85 i = 0;
86 filename[0] = '\0';
87
88 /* Tilde? */
89 if (fname[0] == '~') {
90 j = 0;
91 i = 1;
92 while ((fname[i] != '\0') && (fname[i] != '/')) {
93 username[j++] = fname[i++];
94 }
95 username[j] = '\0';
96
97 if (username[0] == '\0') {
98 /* ~/ resolves to home directory of current user */
99 if ((userRecord = getpwuid(getuid())) != 0) {
100 (void) strcat(filename, userRecord->pw_dir);
101 } else {
102 i = 0;
103 }
104 } else {
105 /* ~user/ resolves to home directory of 'user' */
106 if ((userRecord = getpwnam(username)) != 0) {
107 (void) strcat(filename, userRecord->pw_dir);
108 } else {
109 i = 0;
110 }
111 }
112 }
113
114 /* Concantenate remaining portion of file name */
115 (void) strcat(filename, fname + i);
116 return filename;
117 #else
118 return util_strsav(fname);
119 #endif
120 }
121