[3611] | 1 | /* Program name management.
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| 2 | Copyright (C) 2001-2003, 2005-2022 Free Software Foundation, Inc.
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| 3 | Written by Bruno Haible <bruno@clisp.org>, 2001.
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| 4 |
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| 5 | This program is free software: you can redistribute it and/or modify
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| 6 | it under the terms of the GNU General Public License as published by
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| 7 | the Free Software Foundation, either version 3 of the License, or
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| 8 | (at your option) any later version.
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| 9 |
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| 10 | This program is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | GNU General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU General Public License
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| 16 | along with this program. If not, see <https://www.gnu.org/licenses/>. */
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| 17 |
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| 18 |
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| 19 | #include <config.h>
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| 20 |
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| 21 | /* Specification. */
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| 22 | #undef ENABLE_RELOCATABLE /* avoid defining set_program_name as a macro */
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| 23 | #include "progname.h"
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| 24 |
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| 25 | #include <errno.h> /* get program_invocation_name declaration */
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| 26 | #include <stdio.h>
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| 27 | #include <stdlib.h>
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| 28 | #include <string.h>
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| 29 |
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| 30 |
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| 31 | /* String containing name the program is called with.
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| 32 | To be initialized by main(). */
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| 33 | const char *program_name = NULL;
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| 34 |
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| 35 | /* Set program_name, based on argv[0].
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| 36 | argv0 must be a string allocated with indefinite extent, and must not be
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| 37 | modified after this call. */
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| 38 | void
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| 39 | set_program_name (const char *argv0)
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| 40 | {
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| 41 | /* libtool creates a temporary executable whose name is sometimes prefixed
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| 42 | with "lt-" (depends on the platform). It also makes argv[0] absolute.
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| 43 | But the name of the temporary executable is a detail that should not be
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| 44 | visible to the end user and to the test suite.
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| 45 | Remove this "<dirname>/.libs/" or "<dirname>/.libs/lt-" prefix here. */
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| 46 | const char *slash;
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| 47 | const char *base;
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| 48 |
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| 49 | /* Sanity check. POSIX requires the invoking process to pass a non-NULL
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| 50 | argv[0]. */
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| 51 | if (argv0 == NULL)
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| 52 | {
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| 53 | /* It's a bug in the invoking program. Help diagnosing it. */
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| 54 | fputs ("A NULL argv[0] was passed through an exec system call.\n",
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| 55 | stderr);
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| 56 | abort ();
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| 57 | }
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| 58 |
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| 59 | slash = strrchr (argv0, '/');
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| 60 | base = (slash != NULL ? slash + 1 : argv0);
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| 61 | if (base - argv0 >= 7 && strncmp (base - 7, "/.libs/", 7) == 0)
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| 62 | {
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| 63 | argv0 = base;
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| 64 | if (strncmp (base, "lt-", 3) == 0)
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| 65 | {
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| 66 | argv0 = base + 3;
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| 67 | /* On glibc systems, remove the "lt-" prefix from the variable
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| 68 | program_invocation_short_name. */
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| 69 | #if HAVE_DECL_PROGRAM_INVOCATION_SHORT_NAME
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| 70 | program_invocation_short_name = (char *) argv0;
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| 71 | #endif
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| 72 | }
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| 73 | }
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| 74 |
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| 75 | /* But don't strip off a leading <dirname>/ in general, because when the user
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| 76 | runs
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| 77 | /some/hidden/place/bin/cp foo foo
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| 78 | he should get the error message
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| 79 | /some/hidden/place/bin/cp: `foo' and `foo' are the same file
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| 80 | not
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| 81 | cp: `foo' and `foo' are the same file
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| 82 | */
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| 83 |
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| 84 | program_name = argv0;
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| 85 |
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| 86 | /* On glibc systems, the error() function comes from libc and uses the
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| 87 | variable program_invocation_name, not program_name. So set this variable
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| 88 | as well. */
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| 89 | #if HAVE_DECL_PROGRAM_INVOCATION_NAME
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| 90 | program_invocation_name = (char *) argv0;
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| 91 | #endif
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| 92 | }
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