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       1                 :            : /* Program name management.
       2                 :            :    Copyright (C) 2001-2003, 2005-2013 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 : }