93 lines
3.1 KiB
C
93 lines
3.1 KiB
C
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/* Program name management.
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Copyright (C) 2001-2003, 2005-2022 Free Software Foundation, Inc.
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Written by Bruno Haible <bruno@clisp.org>, 2001.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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/* Specification. */
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#undef ENABLE_RELOCATABLE /* avoid defining set_program_name as a macro */
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#include "progname.h"
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#include <errno.h> /* get program_invocation_name declaration */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/* String containing name the program is called with.
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To be initialized by main(). */
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const char *program_name = NULL;
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/* Set program_name, based on argv[0].
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argv0 must be a string allocated with indefinite extent, and must not be
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modified after this call. */
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void
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set_program_name (const char *argv0)
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{
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/* libtool creates a temporary executable whose name is sometimes prefixed
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with "lt-" (depends on the platform). It also makes argv[0] absolute.
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But the name of the temporary executable is a detail that should not be
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visible to the end user and to the test suite.
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Remove this "<dirname>/.libs/" or "<dirname>/.libs/lt-" prefix here. */
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const char *slash;
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const char *base;
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/* Sanity check. POSIX requires the invoking process to pass a non-NULL
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argv[0]. */
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if (argv0 == NULL)
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{
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/* It's a bug in the invoking program. Help diagnosing it. */
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fputs ("A NULL argv[0] was passed through an exec system call.\n",
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stderr);
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abort ();
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}
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slash = strrchr (argv0, '/');
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base = (slash != NULL ? slash + 1 : argv0);
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if (base - argv0 >= 7 && strncmp (base - 7, "/.libs/", 7) == 0)
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{
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argv0 = base;
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if (strncmp (base, "lt-", 3) == 0)
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{
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argv0 = base + 3;
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/* On glibc systems, remove the "lt-" prefix from the variable
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program_invocation_short_name. */
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#if HAVE_DECL_PROGRAM_INVOCATION_SHORT_NAME
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program_invocation_short_name = (char *) argv0;
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#endif
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}
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}
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/* But don't strip off a leading <dirname>/ in general, because when the user
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runs
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/some/hidden/place/bin/cp foo foo
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he should get the error message
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/some/hidden/place/bin/cp: `foo' and `foo' are the same file
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not
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cp: `foo' and `foo' are the same file
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*/
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program_name = argv0;
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/* On glibc systems, the error() function comes from libc and uses the
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variable program_invocation_name, not program_name. So set this variable
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as well. */
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#if HAVE_DECL_PROGRAM_INVOCATION_NAME
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program_invocation_name = (char *) argv0;
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#endif
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}
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