misc/progname.c

   1 /* Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #ifdef  HAVE_GNU_LD
  20
  21 #include <ansidecl.h>
  22 #include <string.h>
  23
  24 /* These must be initialized data definitions.  Common definitions satisfy
  25    references to these variables, but do not cause the whole file to be
  26    linked in, and so omit the set-up function.  */
  27 char *program_invocation_name = NULL;
  28 char *program_invocation_short_name = NULL;
  29
  30 static void
  31 DEFUN(set_progname, (argc, argv, envp),
  32       int argc AND char **argv AND char **envp)
  33 {
  34   char *p;
  35
  36   if (argv && argv[0])
  37     {
  38       program_invocation_name = argv[0];
  39       p = strrchr (argv[0], '/');
  40       if (p == NULL)
  41         program_invocation_short_name = argv[0];
  42       else
  43         program_invocation_short_name = p + 1;
  44     }
  45   else
  46     program_invocation_name = program_invocation_short_name = 0;
  47
  48   (void) &set_progname;         /* Avoid "defined but not used" warning.  */
  49 }
  50
  51 text_set_element (__libc_subinit, set_progname);
  52
  53 #endif