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92 lines
3.1 KiB
92 lines
3.1 KiB
/* Program name management. |
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Copyright (C) 2001-2003, 2005-2017 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 <http://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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