/* Program name management.
- Copyright (C) 2001-2003 Free Software Foundation, Inc.
- Written by Bruno Haible <haible@clisp.cons.org>, 2001.
+ Copyright (C) 2001-2003, 2005-2011 Free Software Foundation, Inc.
+ Written by Bruno Haible <bruno@clisp.org>, 2001.
- This program is free software; you can redistribute it and/or modify
+ This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software Foundation,
- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
+#include <config.h>
/* Specification. */
+#undef ENABLE_RELOCATABLE /* avoid defining set_program_name as a macro */
#include "progname.h"
+#include <errno.h> /* get program_invocation_name declaration */
+#include <stdio.h>
+#include <stdlib.h>
#include <string.h>
-#undef set_program_name
-
/* String containing name the program is called with.
To be initialized by main(). */
-const char *program_name;
+const char *program_name = NULL;
-/* Set program_name, based on argv[0]. */
+/* Set program_name, based on argv[0].
+ argv0 must be a string allocated with indefinite extent, and must not be
+ modified after this call. */
void
set_program_name (const char *argv0)
{
/* libtool creates a temporary executable whose name is sometimes prefixed
with "lt-" (depends on the platform). It also makes argv[0] absolute.
+ But the name of the temporary executable is a detail that should not be
+ visible to the end user and to the test suite.
Remove this "<dirname>/.libs/" or "<dirname>/.libs/lt-" prefix here. */
const char *slash;
const char *base;
+ /* Sanity check. POSIX requires the invoking process to pass a non-NULL
+ argv[0]. */
+ if (argv0 == NULL)
+ {
+ /* It's a bug in the invoking program. Help diagnosing it. */
+ fputs ("A NULL argv[0] was passed through an exec system call.\n",
+ stderr);
+ abort ();
+ }
+
slash = strrchr (argv0, '/');
base = (slash != NULL ? slash + 1 : argv0);
- if (base - argv0 >= 7 && memcmp (base - 7, "/.libs/", 7) == 0)
- argv0 = base;
- if (strncmp (base, "lt-", 3) == 0)
- argv0 = base + 3;
+ if (base - argv0 >= 7 && strncmp (base - 7, "/.libs/", 7) == 0)
+ {
+ argv0 = base;
+ if (strncmp (base, "lt-", 3) == 0)
+ {
+ argv0 = base + 3;
+ /* On glibc systems, remove the "lt-" prefix from the variable
+ program_invocation_short_name. */
+#if HAVE_DECL_PROGRAM_INVOCATION_SHORT_NAME
+ program_invocation_short_name = (char *) argv0;
+#endif
+ }
+ }
+
+ /* But don't strip off a leading <dirname>/ in general, because when the user
+ runs
+ /some/hidden/place/bin/cp foo foo
+ he should get the error message
+ /some/hidden/place/bin/cp: `foo' and `foo' are the same file
+ not
+ cp: `foo' and `foo' are the same file
+ */
+
program_name = argv0;
+
+ /* On glibc systems, the error() function comes from libc and uses the
+ variable program_invocation_name, not program_name. So set this variable
+ as well. */
+#if HAVE_DECL_PROGRAM_INVOCATION_NAME
+ program_invocation_name = (char *) argv0;
+#endif
}