Return to progname.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / libiconv / srclib

libiconv 1.16

    1: /* Program name management.
    2:    Copyright (C) 2001-2003, 2005-2019 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 <https://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: 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:   if (argv0 == NULL)
   52:     {
   53:       /* It's a bug in the invoking program.  Help diagnosing it.  */
   54:       fputs ("A NULL argv[0] was passed through an exec system call.\n",
   55:              stderr);
   56:       abort ();
   57:     }
   58: 
   59:   slash = strrchr (argv0, '/');
   60:   base = (slash != NULL ? slash + 1 : argv0);
   61:   if (base - argv0 >= 7 && strncmp (base - 7, "/.libs/", 7) == 0)
   62:     {
   63:       argv0 = base;
   64:       if (strncmp (base, "lt-", 3) == 0)
   65:         {
   66:           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:           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:   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:   program_invocation_name = (char *) argv0;
   91: #endif
   92: }