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unsetenv.c

/*
 * Copyright (C) 2001 Alan Robertson <alanr@unix.sh>
 * This software licensed under the GNU LGPL.
 *
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <pygui_internal.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define __environ       environ
#ifndef HAVE_ENVIRON_DECL
extern char **environ;
#endif

int
unsetenv (const char *name)
{
      const size_t len = strlen (name);
      char **ep;

      for (ep = __environ; *ep; ++ep) {
            if (!strncmp (*ep, name, len) && (*ep)[len] == '=') {
                  /* Found it.  */
                  /* Remove this pointer by moving later ones back.  */
                  char **dp = ep;
                  do
                        dp[0] = dp[1];
                  while (*dp++);
                  /* Continue the loop in case NAME appears again.  */  
            }
      }
      return 0;
}

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