alcove

/* Copyright (c) 2014-2022, 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"

static char *alcove_x_decode_iolist_to_string(const char *buf, size_t len,
                                              int *index);

int alcove_decode_argv(const char *arg, size_t len, int *index, char ***argv) {
  int arity = 0;
  int empty = 0;

  int i;
  long maxarg = sysconf(_SC_ARG_MAX);

  if (alcove_decode_list_header(arg, len, index, &arity) < 0)
    return -1;

  if (arity == 0) {
    *argv = NULL;
    return 0;
  }

  if (arity >= maxarg)
    return -1;

  /* NULL terminate */
  *argv = calloc(arity + 1, sizeof(char *));

  if (*argv == NULL)
    exit(errno);

  for (i = 0; i < arity; i++) {
    (*argv)[i] = alcove_x_decode_iolist_to_string(arg, len, index);
    if (!(*argv)[i])
      goto BADARG;
  }

  /* list tail */
  if (arity > 0 &&
      (alcove_decode_list_header(arg, len, index, &empty) < 0 || empty != 0))
    goto BADARG;

  return 0;

BADARG:
  alcove_free_argv(*argv);
  return -1;
}

static char *alcove_x_decode_iolist_to_string(const char *buf, size_t len,
                                              int *index) {
  char tmp[MAXMSGLEN] = {0};
  size_t tmplen = sizeof(tmp) - 1;
  char *res;

  if (alcove_decode_iolist(buf, len, index, tmp, &tmplen) < 0)
    return NULL;

  res = strdup(tmp);
  if (res == NULL)
    exit(errno);

  return res;
}

void alcove_free_argv(char **argv) {
  int i;

  if (argv == NULL)
    return;

  for (i = 0; argv[i]; i++) {
    free(argv[i]);
    argv[i] = NULL;
  }

  free(argv);
  argv = NULL;
}