1 /*
2 This file is not licenced under the GPL like the rest of the code.
3 Its is under the MIT license, to encourage reuse by cut-and-paste.
4
5 Copyright (c) 2007 Red Hat, inc
6
7 Permission is hereby granted, free of charge, to any person
8 obtaining a copy of this software and associated documentation files
9 (the "Software"), to deal in the Software without restriction,
10 including without limitation the rights to use, copy, modify, merge,
11 publish, distribute, sublicense, and/or sell copies of the Software,
12 and to permit persons to whom the Software is furnished to do so,
13 subject to the following conditions:
14
15 The above copyright notice and this permission notice shall be
16 included in all copies or substantial portions of the Software.
17
18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
21 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
22 BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
23 ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
24 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
25 SOFTWARE.
26 */
27
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31
32 /**
33 * xdg_user_dir_lookup_with_fallback:
34 * @type: a string specifying the type of directory
35 * @fallback: value to use if the directory isn't specified by the user
36 * @returns: a newly allocated absolute pathname
37 *
38 * Looks up a XDG user directory of the specified type.
39 * Example of types are "DESKTOP" and "DOWNLOAD".
40 *
41 * In case the user hasn't specified any directory for the specified
42 * type the value returned is @fallback.
43 *
44 * The return value is newly allocated and must be freed with
45 * free(). The return value is never NULL if @fallback != NULL, unless
46 * out of memory.
47 **/
48 static char *
xdg_user_dir_lookup_with_fallback(const char * type,const char * fallback)49 xdg_user_dir_lookup_with_fallback (const char *type, const char *fallback)
50 {
51 FILE *file;
52 char *home_dir, *config_home, *config_file;
53 char buffer[512];
54 char *user_dir;
55 char *p, *d;
56 int len;
57 int relative;
58
59 home_dir = getenv ("HOME");
60
61 if (home_dir == NULL)
62 goto error;
63
64 config_home = getenv ("XDG_CONFIG_HOME");
65 if (config_home == NULL || config_home[0] == 0)
66 {
67 config_file = (char*) malloc (strlen (home_dir) + strlen ("/.config/user-dirs.dirs") + 1);
68 if (config_file == NULL)
69 goto error;
70
71 strcpy (config_file, home_dir);
72 strcat (config_file, "/.config/user-dirs.dirs");
73 }
74 else
75 {
76 config_file = (char*) malloc (strlen (config_home) + strlen ("/user-dirs.dirs") + 1);
77 if (config_file == NULL)
78 goto error;
79
80 strcpy (config_file, config_home);
81 strcat (config_file, "/user-dirs.dirs");
82 }
83
84 file = fopen (config_file, "r");
85 free (config_file);
86 if (file == NULL)
87 goto error;
88
89 user_dir = NULL;
90 while (fgets (buffer, sizeof (buffer), file))
91 {
92 /* Remove newline at end */
93 len = strlen (buffer);
94 if (len > 0 && buffer[len-1] == '\n')
95 buffer[len-1] = 0;
96
97 p = buffer;
98 while (*p == ' ' || *p == '\t')
99 p++;
100
101 if (strncmp (p, "XDG_", 4) != 0)
102 continue;
103 p += 4;
104 if (strncmp (p, type, strlen (type)) != 0)
105 continue;
106 p += strlen (type);
107 if (strncmp (p, "_DIR", 4) != 0)
108 continue;
109 p += 4;
110
111 while (*p == ' ' || *p == '\t')
112 p++;
113
114 if (*p != '=')
115 continue;
116 p++;
117
118 while (*p == ' ' || *p == '\t')
119 p++;
120
121 if (*p != '"')
122 continue;
123 p++;
124
125 relative = 0;
126 if (strncmp (p, "$HOME/", 6) == 0)
127 {
128 p += 6;
129 relative = 1;
130 }
131 else if (*p != '/')
132 continue;
133
134 if (relative)
135 {
136 user_dir = (char*) malloc (strlen (home_dir) + 1 + strlen (p) + 1);
137 if (user_dir == NULL)
138 goto error2;
139
140 strcpy (user_dir, home_dir);
141 strcat (user_dir, "/");
142 }
143 else
144 {
145 user_dir = (char*) malloc (strlen (p) + 1);
146 if (user_dir == NULL)
147 goto error2;
148
149 *user_dir = 0;
150 }
151
152 d = user_dir + strlen (user_dir);
153 while (*p && *p != '"')
154 {
155 if ((*p == '\\') && (*(p+1) != 0))
156 p++;
157 *d++ = *p++;
158 }
159 *d = 0;
160 }
161 error2:
162 fclose (file);
163
164 if (user_dir)
165 return user_dir;
166
167 error:
168 if (fallback)
169 return strdup (fallback);
170 return NULL;
171 }
172
173 /**
174 * xdg_user_dir_lookup:
175 * @type: a string specifying the type of directory
176 * @returns: a newly allocated absolute pathname
177 *
178 * Looks up a XDG user directory of the specified type.
179 * Example of types are "DESKTOP" and "DOWNLOAD".
180 *
181 * The return value is always != NULL (unless out of memory),
182 * and if a directory
183 * for the type is not specified by the user the default
184 * is the home directory. Except for DESKTOP which defaults
185 * to ~/Desktop.
186 *
187 * The return value is newly allocated and must be freed with
188 * free().
189 **/
190 char *
xdg_user_dir_lookup(const char * type)191 xdg_user_dir_lookup (const char *type)
192 {
193 char *dir, *home_dir, *user_dir;
194
195 dir = xdg_user_dir_lookup_with_fallback (type, NULL);
196 if (dir != NULL)
197 return dir;
198
199 home_dir = getenv ("HOME");
200
201 if (home_dir == NULL)
202 return strdup ("/tmp");
203
204 /* Special case desktop for historical compatibility */
205 if (strcmp (type, "DESKTOP") == 0)
206 {
207 user_dir = (char*) malloc (strlen (home_dir) + strlen ("/Desktop") + 1);
208 if (user_dir == NULL)
209 return NULL;
210
211 strcpy (user_dir, home_dir);
212 strcat (user_dir, "/Desktop");
213 return user_dir;
214 }
215
216 return strdup (home_dir);
217 }
218
219 #ifdef STANDALONE_XDG_USER_DIR_LOOKUP
220 int
main(int argc,char * argv[])221 main (int argc, char *argv[])
222 {
223 if (argc != 2)
224 {
225 fprintf (stderr, "Usage %s <dir-type>\n", argv[0]);
226 exit (1);
227 }
228
229 printf ("%s\n", xdg_user_dir_lookup (argv[1]));
230 return 0;
231 }
232 #endif
233