Line data    Source code

       1             : /* Program name management.
       2             :    Copyright (C) 2001-2003, 2005-2016 Free Software Foundation, Inc.
       3             :    Written by Bruno Haible <bruno@clisp.org>, 2001.
       4             : 
       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.
       9             : 
      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.
      14             : 
      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/>.  */
      17             : 
      18             : 
      19             : #include <config.h>
      20             : 
      21             : /* Specification.  */
      22             : #undef ENABLE_RELOCATABLE /* avoid defining set_program_name as a macro */
      23             : #include "progname.h"
      24             : 
      25             : #include <errno.h> /* get program_invocation_name declaration */
      26             : #include <stdio.h>
      27             : #include <stdlib.h>
      28             : #include <string.h>
      29             : 
      30             : 
      31             : /* String containing name the program is called with.
      32             :    To be initialized by main().  */
      33             : const char *program_name = NULL;
      34             : 
      35             : /* Set program_name, based on argv[0].
      36             :    argv0 must be a string allocated with indefinite extent, and must not be
      37             :    modified after this call.  */
      38             : void
      39           1 : set_program_name (const char *argv0)
      40             : {
      41             :   /* libtool creates a temporary executable whose name is sometimes prefixed
      42             :      with "lt-" (depends on the platform).  It also makes argv[0] absolute.
      43             :      But the name of the temporary executable is a detail that should not be
      44             :      visible to the end user and to the test suite.
      45             :      Remove this "<dirname>/.libs/" or "<dirname>/.libs/lt-" prefix here.  */
      46             :   const char *slash;
      47             :   const char *base;
      48             : 
      49             :   /* Sanity check.  POSIX requires the invoking process to pass a non-NULL
      50             :      argv[0].  */
      51           1 :   if (argv0 == NULL)
      52             :     {
      53             :       /* It's a bug in the invoking program.  Help diagnosing it.  */
      54           0 :       fputs ("A NULL argv[0] was passed through an exec system call.\n",
      55             :              stderr);
      56           0 :       abort ();
      57             :     }
      58             : 
      59           1 :   slash = strrchr (argv0, '/');
      60           1 :   base = (slash != NULL ? slash + 1 : argv0);
      61           1 :   if (base - argv0 >= 7 && strncmp (base - 7, "/.libs/", 7) == 0)
      62             :     {
      63           0 :       argv0 = base;
      64           0 :       if (strncmp (base, "lt-", 3) == 0)
      65             :         {
      66           0 :           argv0 = base + 3;
      67             :           /* On glibc systems, remove the "lt-" prefix from the variable
      68             :              program_invocation_short_name.  */
      69             : #if HAVE_DECL_PROGRAM_INVOCATION_SHORT_NAME
      70           0 :           program_invocation_short_name = (char *) argv0;
      71             : #endif
      72             :         }
      73             :     }
      74             : 
      75             :   /* But don't strip off a leading <dirname>/ in general, because when the user
      76             :      runs
      77             :          /some/hidden/place/bin/cp foo foo
      78             :      he should get the error message
      79             :          /some/hidden/place/bin/cp: `foo' and `foo' are the same file
      80             :      not
      81             :          cp: `foo' and `foo' are the same file
      82             :    */
      83             : 
      84           1 :   program_name = argv0;
      85             : 
      86             :   /* On glibc systems, the error() function comes from libc and uses the
      87             :      variable program_invocation_name, not program_name.  So set this variable
      88             :      as well.  */
      89             : #if HAVE_DECL_PROGRAM_INVOCATION_NAME
      90           1 :   program_invocation_name = (char *) argv0;
      91             : #endif
      92           1 : }