1 /* Java CLASSPATH handling.
2 Copyright (C) 2001-2003, 2006 Free Software Foundation, Inc.
3 Written by Bruno Haible <haible@clisp.cons.org>, 2001.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
8 any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software Foundation,
17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18
19 #include <config.h>
20
21 /* Specification. */
22 #include "classpath.h"
23
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <string.h>
27
28 #include "xsetenv.h"
29 #include "xalloc.h"
30
31 /* Name of environment variable. */
32 #ifndef CLASSPATHVAR
33 # define CLASSPATHVAR "CLASSPATH"
34 #endif
35
36 /* Separator in PATH like lists of pathnames. */
37 #if ((defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__) || defined __EMX__ || defined __DJGPP__
38 /* Win32, OS/2, DOS */
39 # define PATH_SEPARATOR ';'
40 #else
41 /* Unix */
42 # define PATH_SEPARATOR ':'
43 #endif
44
45 /* Return the new CLASSPATH value. The given classpaths are prepended to
46 the current CLASSPATH value. If use_minimal_classpath, the current
47 CLASSPATH is ignored. */
48 char *
new_classpath(const char * const * classpaths,unsigned int classpaths_count,bool use_minimal_classpath)49 new_classpath (const char * const *classpaths, unsigned int classpaths_count,
50 bool use_minimal_classpath)
51 {
52 const char *old_classpath;
53 unsigned int length;
54 unsigned int i;
55 char *result;
56 char *p;
57
58 old_classpath = (use_minimal_classpath ? NULL : getenv (CLASSPATHVAR));
59 if (old_classpath == NULL)
60 old_classpath = "";
61
62 length = 0;
63 for (i = 0; i < classpaths_count; i++)
64 length += strlen (classpaths[i]) + 1;
65 length += strlen (old_classpath);
66 if (classpaths_count > 0 && old_classpath[0] == '\0')
67 length--;
68
69 result = (char *) xmalloc (length + 1);
70 p = result;
71 for (i = 0; i < classpaths_count; i++)
72 {
73 memcpy (p, classpaths[i], strlen (classpaths[i]));
74 p += strlen (classpaths[i]);
75 *p++ = PATH_SEPARATOR;
76 }
77 if (old_classpath[0] != '\0')
78 {
79 memcpy (p, old_classpath, strlen (old_classpath));
80 p += strlen (old_classpath);
81 }
82 else
83 {
84 if (classpaths_count > 0)
85 p--;
86 }
87 *p = '\0';
88
89 return result;
90 }
91
92 /* Set CLASSPATH and returns a safe copy of its old value. */
93 char *
set_classpath(const char * const * classpaths,unsigned int classpaths_count,bool use_minimal_classpath,bool verbose)94 set_classpath (const char * const *classpaths, unsigned int classpaths_count,
95 bool use_minimal_classpath, bool verbose)
96 {
97 const char *old_CLASSPATH = getenv (CLASSPATHVAR);
98 char *result = (old_CLASSPATH != NULL ? xstrdup (old_CLASSPATH) : NULL);
99 char *new_CLASSPATH =
100 new_classpath (classpaths, classpaths_count, use_minimal_classpath);
101
102 if (verbose)
103 printf (CLASSPATHVAR "=%s ", new_CLASSPATH);
104
105 xsetenv (CLASSPATHVAR, new_CLASSPATH, 1);
106
107 free (new_CLASSPATH);
108
109 return result;
110 }
111
112 /* Restore CLASSPATH to its previous value. */
113 void
reset_classpath(char * old_classpath)114 reset_classpath (char *old_classpath)
115 {
116 if (old_classpath != NULL)
117 {
118 xsetenv (CLASSPATHVAR, old_classpath, 1);
119 free (old_classpath);
120 }
121 else
122 unsetenv (CLASSPATHVAR);
123 }
124