/*

 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")

 *

 * SPDX-License-Identifier: MPL-2.0

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, you can obtain one at https://mozilla.org/MPL/2.0/.

 *

 * See the COPYRIGHT file distributed with this work for additional

 * information regarding copyright ownership.

 */

/*! \file */

#include <ctype.h>

#include <errno.h>

#include <inttypes.h>

#include <limits.h>

#include <stdlib.h>

#include <isc/parseint.h>

#include <isc/result.h>

isc_result_t

isc_parse_uint32(uint32_t *uip, const char *string, int base) {

  unsigned long n;

  uint32_t r;

  char *e;

  if (!isalnum((unsigned char)(string[0]))) {

    return ISC_R_BADNUMBER;

  }

  errno = 0;

  n = strtoul(string, &e, base);

  if (*e != '\0') {

    return ISC_R_BADNUMBER;

  }

  /*

   * Where long is 64 bits we need to convert to 32 bits then test for

   * equality.  This is a no-op on 32 bit machines and a good compiler

   * will optimise it away.

   */

  r = (uint32_t)n;

  if ((n == ULONG_MAX && errno == ERANGE) || (n != (unsigned long)r)) {

    return ISC_R_RANGE;

  }

  *uip = r;

  return ISC_R_SUCCESS;

}

isc_result_t

isc_parse_uint16(uint16_t *uip, const char *string, int base) {

  uint32_t val;

  RETERR(isc_parse_uint32(&val, string, base));

  if (val > 0xFFFF) {

    return ISC_R_RANGE;

  }

  *uip = (uint16_t)val;

  return ISC_R_SUCCESS;

}

isc_result_t

isc_parse_uint8(uint8_t *uip, const char *string, int base) {

  uint32_t val;

  RETERR(isc_parse_uint32(&val, string, base));

  if (val > 0xFF) {

    return ISC_R_RANGE;

  }

  *uip = (uint8_t)val;

  return ISC_R_SUCCESS;

}