1 /* Relocating wrapper program.
2 Copyright (C) 2003, 2005-2007, 2009-2010 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2003.
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 3 of the License, or
8 (at your option) any later version.
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.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
33 Macros that need to be set while compiling this file:
34 - ENABLE_RELOCATABLE 1
35 - INSTALLPREFIX the base installation directory
36 - INSTALLDIR the directory into which this program is installed
37 - LIBPATHVAR the platform dependent runtime library path variable
38 - LIBDIRS a comma-terminated list of strings representing the list of
39 directories that contain the libraries at installation time
41 We don't want to internationalize this wrapper because then it would
42 depend on libintl and therefore need relocation itself. So use only
43 libc functions, no gettext(), no error(), no xmalloc(), no xsetenv().
55 #include "relocatable.h"
58 /* Use the system functions, not the gnulib overrides in this file. */
62 /* Return a copy of the filename, with an extra ".bin" at the end.
63 More generally, it replaces "${EXEEXT}" at the end with ".bin${EXEEXT}". */
65 add_dotbin (const char *filename)
67 size_t filename_len = strlen (filename);
68 char *result = (char *) malloc (filename_len + 4 + 1);
72 if (sizeof (EXEEXT) > sizeof (""))
74 /* EXEEXT handling. */
75 const size_t exeext_len = sizeof (EXEEXT) - sizeof ("");
76 static const char exeext[] = EXEEXT;
77 if (filename_len > exeext_len)
79 /* Compare using an inlined copy of c_strncasecmp(), because
80 the filenames may have undergone a case conversion since
81 they were packaged. In other words, EXEEXT may be ".exe"
82 on one system and ".EXE" on another. */
83 const char *s1 = filename + filename_len - exeext_len;
84 const char *s2 = exeext;
85 for (; *s1 != '\0'; s1++, s2++)
87 unsigned char c1 = *s1;
88 unsigned char c2 = *s2;
89 if (c_tolower (c1) != c_tolower (c2))
92 /* Insert ".bin" before EXEEXT or its equivalent. */
93 memcpy (result, filename, filename_len - exeext_len);
94 memcpy (result + filename_len - exeext_len, ".bin", 4);
95 memcpy (result + filename_len - exeext_len + 4,
96 filename + filename_len - exeext_len,
102 /* Simply append ".bin". */
103 memcpy (result, filename, filename_len);
104 memcpy (result + filename_len, ".bin", 4 + 1);
109 fprintf (stderr, "%s: %s\n", program_name, "memory exhausted");
114 /* List of directories that contain the libraries. */
115 static const char *libdirs[] = { LIBDIRS NULL };
116 /* Verify that at least one directory is given. */
117 typedef int verify1[2 * (sizeof (libdirs) / sizeof (libdirs[0]) > 1) - 1];
119 /* Relocate the list of directories that contain the libraries. */
125 for (i = 0; i < sizeof (libdirs) / sizeof (libdirs[0]) - 1; i++)
126 libdirs[i] = relocate (libdirs[i]);
129 /* Activate the list of directories in the LIBPATHVAR. */
133 const char *old_value;
139 old_value = getenv (LIBPATHVAR);
140 if (old_value == NULL)
144 for (i = 0; i < sizeof (libdirs) / sizeof (libdirs[0]) - 1; i++)
145 total += strlen (libdirs[i]) + 1;
146 total += strlen (old_value) + 1;
148 value = (char *) malloc (total);
151 fprintf (stderr, "%s: %s\n", program_name, "memory exhausted");
155 for (i = 0; i < sizeof (libdirs) / sizeof (libdirs[0]) - 1; i++)
157 size_t len = strlen (libdirs[i]);
158 memcpy (p, libdirs[i], len);
162 if (old_value[0] != '\0')
163 strcpy (p, old_value);
167 if (setenv (LIBPATHVAR, value, 1) < 0)
169 fprintf (stderr, "%s: %s\n", program_name, "memory exhausted");
175 main (int argc, char *argv[])
177 char *full_program_name;
179 /* Set the program name and perform preparations for
180 get_full_program_name() and relocate(). */
181 set_program_name_and_installdir (argv[0], INSTALLPREFIX, INSTALLDIR);
183 /* Get the full program path. (Important if accessed through a symlink.) */
184 full_program_name = get_full_program_name ();
185 if (full_program_name == NULL)
186 full_program_name = argv[0];
188 /* Invoke the real program, with suffix ".bin". */
189 argv[0] = add_dotbin (full_program_name);
192 execv (argv[0], argv);
193 fprintf (stderr, "%s: could not execute %s: %s\n",
194 program_name, argv[0], strerror (errno));