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"
59 /* Use the system functions, not the gnulib overrides in this file. */
63 /* Return a copy of the filename, with an extra ".bin" at the end.
64 More generally, it replaces "${EXEEXT}" at the end with ".bin${EXEEXT}". */
66 add_dotbin (const char *filename)
68 size_t filename_len = strlen (filename);
69 char *result = (char *) malloc (filename_len + 4 + 1);
73 if (sizeof (EXEEXT) > sizeof (""))
75 /* EXEEXT handling. */
76 const size_t exeext_len = sizeof (EXEEXT) - sizeof ("");
77 static const char exeext[] = EXEEXT;
78 if (filename_len > exeext_len)
80 /* Compare using an inlined copy of c_strncasecmp(), because
81 the filenames may have undergone a case conversion since
82 they were packaged. In other words, EXEEXT may be ".exe"
83 on one system and ".EXE" on another. */
84 const char *s1 = filename + filename_len - exeext_len;
85 const char *s2 = exeext;
86 for (; *s1 != '\0'; s1++, s2++)
88 unsigned char c1 = *s1;
89 unsigned char c2 = *s2;
90 if (c_tolower (c1) != c_tolower (c2))
93 /* Insert ".bin" before EXEEXT or its equivalent. */
94 memcpy (result, filename, filename_len - exeext_len);
95 memcpy (result + filename_len - exeext_len, ".bin", 4);
96 memcpy (result + filename_len - exeext_len + 4,
97 filename + filename_len - exeext_len,
103 /* Simply append ".bin". */
104 memcpy (result, filename, filename_len);
105 memcpy (result + filename_len, ".bin", 4 + 1);
110 fprintf (stderr, "%s: %s\n", program_name, "memory exhausted");
115 /* List of directories that contain the libraries. */
116 static const char *libdirs[] = { LIBDIRS NULL };
117 /* Verify that at least one directory is given. */
118 verify (sizeof (libdirs) / sizeof (libdirs[0]) > 1);
120 /* Relocate the list of directories that contain the libraries. */
126 for (i = 0; i < sizeof (libdirs) / sizeof (libdirs[0]) - 1; i++)
127 libdirs[i] = relocate (libdirs[i]);
130 /* Activate the list of directories in the LIBPATHVAR. */
134 const char *old_value;
140 old_value = getenv (LIBPATHVAR);
141 if (old_value == NULL)
145 for (i = 0; i < sizeof (libdirs) / sizeof (libdirs[0]) - 1; i++)
146 total += strlen (libdirs[i]) + 1;
147 total += strlen (old_value) + 1;
149 value = (char *) malloc (total);
152 fprintf (stderr, "%s: %s\n", program_name, "memory exhausted");
156 for (i = 0; i < sizeof (libdirs) / sizeof (libdirs[0]) - 1; i++)
158 size_t len = strlen (libdirs[i]);
159 memcpy (p, libdirs[i], len);
163 if (old_value[0] != '\0')
164 strcpy (p, old_value);
168 if (setenv (LIBPATHVAR, value, 1) < 0)
170 fprintf (stderr, "%s: %s\n", program_name, "memory exhausted");
176 main (int argc, char *argv[])
178 char *full_program_name;
180 /* Set the program name and perform preparations for
181 get_full_program_name() and relocate(). */
182 set_program_name_and_installdir (argv[0], INSTALLPREFIX, INSTALLDIR);
184 /* Get the full program path. (Important if accessed through a symlink.) */
185 full_program_name = get_full_program_name ();
186 if (full_program_name == NULL)
187 full_program_name = argv[0];
189 /* Invoke the real program, with suffix ".bin". */
190 argv[0] = add_dotbin (full_program_name);
193 execv (argv[0], argv);
194 fprintf (stderr, "%s: could not execute %s: %s\n",
195 program_name, argv[0], strerror (errno));