1/* Relocating wrapper program.
2   Copyright (C) 2003 Free Software Foundation, Inc.
3   Written by Bruno Haible <bruno@clisp.org>, 2003.
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/* Dependencies:
20   relocwrapper
21    -> progname
22    -> progreloc
23        -> xreadlink
24           -> readlink
25        -> canonicalize
26           -> allocsa
27    -> relocatable
28    -> setenv
29       -> allocsa
30    -> strerror
31
32   Macros that need to be set while compiling this file:
33     - ENABLE_RELOCATABLE 1
34     - INSTALLPREFIX the base installation directory
35     - INSTALLDIR the directory into which this program is installed
36     - LIBPATHVAR the platform dependent runtime library path variable
37     - LIBDIRS a comma-terminated list of strings representing the list of
38       directories that contain the libraries at installation time
39
40   We don't want to internationalize this wrapper because then it would
41   depend on libintl and therefore need relocation itself.  So use only
42   libc functions, no gettext(), no error(), no xmalloc(), no xsetenv().
43 */
44
45#ifdef HAVE_CONFIG_H
46# include <config.h>
47#endif
48
49#include <stdio.h>
50#include <stdlib.h>
51#include <string.h>
52#if HAVE_UNISTD_H
53# include <unistd.h>
54#endif
55#include <errno.h>
56
57#include "progname.h"
58#include "relocatable.h"
59#include "setenv.h"
60
61/* Return a copy of the filename, with an extra ".bin" at the end.  */
62static char *
63add_dotbin (const char *filename)
64{
65  size_t filename_len = strlen (filename);
66  char *result = (char *) malloc (filename_len + 4 + 1);
67
68  if (result != NULL)
69    {
70      memcpy (result, filename, filename_len);
71      memcpy (result + filename_len, ".bin", 4 + 1);
72      return result;
73    }
74  else
75    {
76      fprintf (stderr, "%s: %s\n", program_name, "memory exhausted");
77      exit (1);
78    }
79}
80
81/* List of directories that contain the libraries.  */
82static const char *libdirs[] = { LIBDIRS NULL };
83/* Verify that at least one directory is given.  */
84typedef int verify1[2 * (sizeof (libdirs) / sizeof (libdirs[0]) > 1) - 1];
85
86/* Relocate the list of directories that contain the libraries.  */
87static void
88relocate_libdirs ()
89{
90  size_t i;
91
92  for (i = 0; i < sizeof (libdirs) / sizeof (libdirs[0]) - 1; i++)
93    libdirs[i] = relocate (libdirs[i]);
94}
95
96/* Activate the list of directories in the LIBPATHVAR.  */
97static void
98activate_libdirs ()
99{
100  const char *old_value;
101  size_t total;
102  size_t i;
103  char *value;
104  char *p;
105
106  old_value = getenv (LIBPATHVAR);
107  if (old_value == NULL)
108    old_value = "";
109
110  total = 0;
111  for (i = 0; i < sizeof (libdirs) / sizeof (libdirs[0]) - 1; i++)
112    total += strlen (libdirs[i]) + 1;
113  total += strlen (old_value) + 1;
114
115  value = (char *) malloc (total);
116  if (value == NULL)
117    {
118      fprintf (stderr, "%s: %s\n", program_name, "memory exhausted");
119      exit (1);
120    }
121  p = value;
122  for (i = 0; i < sizeof (libdirs) / sizeof (libdirs[0]) - 1; i++)
123    {
124      size_t len = strlen (libdirs[i]);
125      memcpy (p, libdirs[i], len);
126      p += len;
127      *p++ = ':';
128    }
129  if (old_value[0] != '\0')
130    strcpy (p, old_value);
131  else
132    p[-1] = '\0';
133
134  if (setenv (LIBPATHVAR, value, 1) < 0)
135    {
136      fprintf (stderr, "%s: %s\n", program_name, "memory exhausted");
137      exit (1);
138    }
139}
140
141int
142main (int argc, char *argv[])
143{
144  char *full_program_name;
145
146  /* Set the program name and perform preparations for
147     get_full_program_name() and relocate().  */
148  set_program_name_and_installdir (argv[0], INSTALLPREFIX, INSTALLDIR);
149
150  /* Get the full program path.  (Important if accessed through a symlink.)  */
151  full_program_name = get_full_program_name ();
152  if (full_program_name == NULL)
153    full_program_name = argv[0];
154
155  /* Invoke the real program, with suffix ".bin".  */
156  argv[0] = add_dotbin (full_program_name);
157  relocate_libdirs ();
158  activate_libdirs ();
159  execv (argv[0], argv);
160  fprintf (stderr, "%s: could not execute %s: %s\n",
161	   program_name, argv[0], strerror (errno));
162  exit (127);
163}
164