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1 /***************************************************************************
2  *                                  _   _ ____  _
3  *  Project                     ___| | | |  _ \| |
4  *                             / __| | | | |_) | |
5  *                            | (__| |_| |  _ <| |___
6  *                             \___|\___/|_| \_\_____|
7  *
8  * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
9  *
10  * This software is licensed as described in the file COPYING, which
11  * you should have received as part of this distribution. The terms
12  * are also available at https://curl.haxx.se/docs/copyright.html.
13  *
14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15  * copies of the Software, and permit persons to whom the Software is
16  * furnished to do so, under the terms of the COPYING file.
17  *
18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19  * KIND, either express or implied.
20  *
21  ***************************************************************************/
22 #include "tool_setup.h"
23 
24 #ifdef HAVE_PWD_H
25 #  include <pwd.h>
26 #endif
27 
28 #include "tool_homedir.h"
29 
30 #include "memdebug.h" /* keep this as LAST include */
31 
GetEnv(const char * variable,char do_expand)32 static char *GetEnv(const char *variable, char do_expand)
33 {
34   char *env = NULL;
35 #ifdef WIN32
36   char  buf1[1024], buf2[1024];
37   DWORD rc;
38 
39   /* Don't use getenv(); it doesn't find variable added after program was
40    * started. Don't accept truncated results (i.e. rc >= sizeof(buf1)).  */
41 
42   rc = GetEnvironmentVariable(variable, buf1, sizeof(buf1));
43   if(rc > 0 && rc < sizeof(buf1)) {
44     env = buf1;
45     variable = buf1;
46   }
47   if(do_expand && strchr(variable, '%')) {
48     /* buf2 == variable if not expanded */
49     rc = ExpandEnvironmentStrings (variable, buf2, sizeof(buf2));
50     if(rc > 0 && rc < sizeof(buf2) &&
51        !strchr(buf2, '%'))    /* no vars still unexpanded */
52       env = buf2;
53   }
54 #else
55   (void)do_expand;
56   /* no length control */
57   env = getenv(variable);
58 #endif
59   return (env && env[0]) ? strdup(env) : NULL;
60 }
61 
62 /* return the home directory of the current user as an allocated string */
homedir(void)63 char *homedir(void)
64 {
65   char *home;
66 
67   home = GetEnv("CURL_HOME", FALSE);
68   if(home)
69     return home;
70 
71   home = GetEnv("HOME", FALSE);
72   if(home)
73     return home;
74 
75 #if defined(HAVE_GETPWUID) && defined(HAVE_GETEUID)
76  {
77    struct passwd *pw = getpwuid(geteuid());
78 
79    if(pw) {
80      home = pw->pw_dir;
81      if(home && home[0])
82        home = strdup(home);
83      else
84        home = NULL;
85    }
86  }
87 #endif /* PWD-stuff */
88 #ifdef WIN32
89   home = GetEnv("APPDATA", TRUE);
90   if(!home)
91     home = GetEnv("%USERPROFILE%\\Application Data", TRUE); /* Normally only
92                                                                on Win-2K/XP */
93 #endif /* WIN32 */
94   return home;
95 }
96