lib/progname.c

   1 /* Program name management.
   2    Copyright (C) 2001-2003, 2005-2006 Free Software Foundation, Inc.
   3    Written by Bruno Haible <haible@clisp.cons.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 2, or (at your option)
   8    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, write to the Free Software Foundation,
  17    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  18
  19
  20 #include <config.h>
  21
  22 /* Specification.  */
  23 #undef ENABLE_RELOCATABLE /* avoid defining set_program_name as a macro */
  24 #include "progname.h"
  25
  26 #include <string.h>
  27
  28
  29 /* String containing name the program is called with.
  30    To be initialized by main().  */
  31 const char *program_name = NULL;
  32
  33 /* Set program_name, based on argv[0].  */
  34 void
  35 set_program_name (const char *argv0)
  36 {
  37   /* libtool creates a temporary executable whose name is sometimes prefixed
  38      with "lt-" (depends on the platform).  It also makes argv[0] absolute.
  39      Remove this "<dirname>/.libs/" or "<dirname>/.libs/lt-" prefix here.  */
  40   const char *slash;
  41   const char *base;
  42
  43   slash = strrchr (argv0, '/');
  44   base = (slash != NULL ? slash + 1 : argv0);
  45   if (base - argv0 >= 7 && memcmp (base - 7, "/.libs/", 7) == 0)
  46     argv0 = base;
  47   if (strncmp (base, "lt-", 3) == 0)
  48     argv0 = base + 3;
  49   program_name = argv0;
  50 }