/*

 * SPDX-License-Identifier: ISC

 *

 * Copyright (c) 2013-2020 Todd C. Miller <Todd.Miller@sudo.ws>

 *

 * Permission to use, copy, modify, and 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 <config.h>

#include <sys/types.h>      /* for id_t */

#ifdef HAVE_STDBOOL_H

# include <stdbool.h>

#else

# include <compat/stdbool.h>

#endif

#include <ctype.h>

#include <errno.h>

#include <limits.h>

#include <sudo_compat.h>

#include <sudo_debug.h>

#include <sudo_gettext.h>

#include <sudo_util.h>

/*

 * Make sure that the ID ends with a valid separator char.

 */

static bool

valid_separator(const char *p, const char *ep, const char *sep)

{

    bool valid = false;

    if (ep != p) {

  /* check for valid separator (including '\0') */

  if (sep == NULL)

      sep = "";

  do {

      if (*ep == *sep)

    valid = true;

  } while (*sep++ != '\0');

    }

    return valid;

}

/*

 * Parse a uid/gid in string form.

 * If sep is non-NULL, it contains valid separator characters (e.g. comma, space)

 * If endp is non-NULL it is set to the next char after the ID.

 * On success, returns the parsed ID and clears errstr.

 * On error, returns 0 and sets errstr.

 */

id_t

sudo_strtoidx_v1(const char *p, const char *sep, char **endp, const char **errstrp)

{

    const char *errstr;

    char *ep;

    id_t ret;

    debug_decl(sudo_strtoid, SUDO_DEBUG_UTIL);

    ret = (id_t)sudo_strtonumx(p, INT_MIN, UINT_MAX, &ep, &errstr);

    if (errstr == NULL) {

  /*

   * Disallow id -1 (UINT_MAX), which means "no change"

   * and check for a valid separator (if specified).

   */

  if (ret == (id_t)-1 || ret == (id_t)UINT_MAX || !valid_separator(p, ep, sep)) {

      errstr = N_("invalid value");

      errno = EINVAL;

      ret = 0;

  }

    }

    if (errstrp != NULL)

  *errstrp = errstr;

    if (endp != NULL)

  *endp = ep;

    debug_return_id_t(ret);

}

/* Backward compatibility */

id_t

sudo_strtoid_v1(const char *p, const char *sep, char **endp, const char **errstrp)

{

    return sudo_strtoidx_v1(p, sep, endp, errstrp);

}

/* Simplified interface */

id_t

sudo_strtoid_v2(const char *p, const char **errstrp)

{

    return sudo_strtoidx_v1(p, NULL, NULL, errstrp);

}