setenv.cc

// nullmailer -- a simple relay-only MTA
// Copyright (C) 2018  Bruce Guenter <bruce@untroubled.org>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
// You can contact me at <bruce@untroubled.org>.  There is also a mailing list
// available to discuss this package.  To subscribe, send an email to
// <nullmailer-subscribe@lists.untroubled.org>.

#include <config.h>
#include <stdlib.h>
#include <string.h>
#include "setenv.h"

#ifndef HAVE_SETENV
// This is not really a full emulation of setenv, but close enough
int setenv(const char* var, const char* val, int overwrite)
{
  size_t varlen = strlen(var);
  size_t vallen = strlen(val);
  char* str = (char*)malloc(varlen+vallen+2);
  if (str == 0) return -1;
  memcpy(str, var, varlen);
  str[varlen] = '=';
  memcpy(str+varlen+1, val, vallen);
  str[varlen+vallen+1] = 0;
  return putenv(str);
}
#endif