parseint.c revision 1.2 
1/*	$NetBSD: parseint.c,v 1.2 2018/08/12 13:02:37 christos Exp $	*/
2
3/*
4 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
5 *
6 * This Source Code Form is subject to the terms of the Mozilla Public
7 * License, v. 2.0. If a copy of the MPL was not distributed with this
8 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
9 *
10 * See the COPYRIGHT file distributed with this work for additional
11 * information regarding copyright ownership.
12 */
13
14
15/*! \file */
16
17#include <config.h>
18
19#include <ctype.h>
20#include <errno.h>
21#include <limits.h>
22
23#include <isc/parseint.h>
24#include <isc/result.h>
25#include <isc/stdlib.h>
26
27isc_result_t
28isc_parse_uint32(isc_uint32_t *uip, const char *string, int base) {
29	unsigned long n;
30	isc_uint32_t r;
31	char *e;
32	if (! isalnum((unsigned char)(string[0])))
33		return (ISC_R_BADNUMBER);
34	errno = 0;
35	n = strtoul(string, &e, base);
36	if (*e != '\0')
37		return (ISC_R_BADNUMBER);
38	/*
39	 * Where long is 64 bits we need to convert to 32 bits then test for
40	 * equality.  This is a no-op on 32 bit machines and a good compiler
41	 * will optimise it away.
42	 */
43	r = (isc_uint32_t)n;
44	if ((n == ULONG_MAX && errno == ERANGE) || (n != (unsigned long)r))
45		return (ISC_R_RANGE);
46	*uip = r;
47	return (ISC_R_SUCCESS);
48}
49
50isc_result_t
51isc_parse_uint16(isc_uint16_t *uip, const char *string, int base) {
52	isc_uint32_t val;
53	isc_result_t result;
54	result = isc_parse_uint32(&val, string, base);
55	if (result != ISC_R_SUCCESS)
56		return (result);
57	if (val > 0xFFFF)
58		return (ISC_R_RANGE);
59	*uip = (isc_uint16_t) val;
60	return (ISC_R_SUCCESS);
61}
62
63isc_result_t
64isc_parse_uint8(isc_uint8_t *uip, const char *string, int base) {
65	isc_uint32_t val;
66	isc_result_t result;
67	result = isc_parse_uint32(&val, string, base);
68	if (result != ISC_R_SUCCESS)
69		return (result);
70	if (val > 0xFF)
71		return (ISC_R_RANGE);
72	*uip = (isc_uint8_t) val;
73	return (ISC_R_SUCCESS);
74}
75