/* Copyright (c) 2014, Michael Santos <michael.santos@gmail.com>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include "alcove.h"
#include "alcove_call.h"

/*
 * setenv(3)
 *
 */

ssize_t alcove_sys_setenv(alcove_state_t *ap, const char *arg, size_t len,
                          char *reply, size_t rlen) {
  int index = 0;
  char name[MAXMSGLEN] = {0};
  size_t namelen = sizeof(name) - 1;
  char value[MAXMSGLEN] = {0};
  size_t valuelen = sizeof(value) - 1;
  int overwrite = 0;
  int rv = 0;

  UNUSED(ap);

  /* name */
  if (alcove_decode_iolist(arg, len, &index, name, &namelen) < 0 ||
      namelen == 0)
    return -1;

  /* value */
  if (alcove_decode_iolist(arg, len, &index, value, &valuelen) < 0)
    return -1;

  /* overwrite */
  if (alcove_decode_int(arg, len, &index, &overwrite) < 0)
    return -1;

  rv = setenv(name, value, overwrite);

  return (rv < 0) ? alcove_mk_errno(reply, rlen, errno)
                  : alcove_mk_atom(reply, rlen, "ok");
}