lib/isc/parseint.c

	parseint.c revision 0c27b3fe77ac1d5094ba3521e8142d9e7973133f
/*
 * Copyright (C) 2001-2005, 2007, 2012, 2016  Internet Systems Consortium, Inc. ("ISC")
 *
 * 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 http://mozilla.org/MPL/2.0/.
 */

/* $Id: parseint.c,v 1.8 2007/06/19 23:47:17 tbox Exp $ */

/*! \file */

#include <config.h>

#include <ctype.h>
#include <errno.h>
#include <limits.h>

#include <isc/parseint.h>
#include <isc/result.h>
#include <isc/stdlib.h>

isc_result_t
isc_parse_uint32(isc_uint32_t *uip, const char *string, int base) {
    unsigned long n;
    isc_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 = (isc_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(isc_uint16_t *uip, const char *string, int base) {
    isc_uint32_t val;
    isc_result_t result;
    result = isc_parse_uint32(&val, string, base);
    if (result != ISC_R_SUCCESS)
        return (result);
    if (val > 0xFFFF)
        return (ISC_R_RANGE);
    *uip = (isc_uint16_t) val;
    return (ISC_R_SUCCESS);
}

isc_result_t
isc_parse_uint8(isc_uint8_t *uip, const char *string, int base) {
    isc_uint32_t val;
    isc_result_t result;
    result = isc_parse_uint32(&val, string, base);
    if (result != ISC_R_SUCCESS)
        return (result);
    if (val > 0xFF)
        return (ISC_R_RANGE);
    *uip = (isc_uint8_t) val;
    return (ISC_R_SUCCESS);
}