contrib/cvs-1.12/lib/setenv.h

   1 /* Setting environment variables.
   2    Copyright (C) 2001-2004 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program 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
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  17
  18 #if HAVE_SETENV || HAVE_UNSETENV
  19
  20 /* Get setenv(), unsetenv() declarations.  */
  21 # include <stdlib.h>
  22
  23 #endif
  24
  25 #ifdef  __cplusplus
  26 extern "C" {
  27 #endif
  28
  29 #if !HAVE_SETENV
  30
  31 /* Set NAME to VALUE in the environment.
  32    If REPLACE is nonzero, overwrite an existing value.  */
  33 extern int setenv (const char *name, const char *value, int replace);
  34
  35 #endif
  36
  37 #if HAVE_UNSETENV
  38
  39 # if VOID_UNSETENV
  40 /* On some systems, unsetenv() returns void.
  41    This is the case for FreeBSD 4.8, NetBSD 1.6, OpenBSD 3.4.  */
  42 #  define unsetenv(name) ((unsetenv)(name), 0)
  43 # endif
  44
  45 #else
  46
  47 /* Remove the variable NAME from the environment.  */
  48 extern int unsetenv (const char *name);
  49
  50 #endif
  51
  52 #ifdef  __cplusplus
  53 }
  54 #endif