xstrto.cc
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1/*
2 * Copyright (C) 1996-2022 The Squid Software Foundation and contributors
3 *
4 * Squid software is distributed under GPLv2+ license and includes
5 * contributions from numerous individuals and organizations.
6 * Please see the COPYING and CONTRIBUTORS files for details.
7 */
8
9#ifndef SQUID_XSTRTO_C_
10#define SQUID_XSTRTO_C_
11
12/*
13 * Shamelessly duplicated from the netfilter iptables sources
14 * for use by the Squid Project under GNU Public License.
15 *
16 * Reason for use as explained by Luciano Coelho:
17 * "I found that there is a bug in strtoul (and strtoull for
18 * that matter) that causes the long to overflow if there are valid digits
19 * after the maximum possible digits for the base. For example if you try
20 * to strtoul 0xfffffffff (with 9 f's) the strtoul will overflow and come
21 * up with a bogus result. I can't easily truncate the string to avoid
22 * this problem, because with decimal or octal, the same valid value would
23 * take more spaces. I could do some magic here, checking whether it's a
24 * hex, dec or oct and truncate appropriately, but that would be very ugly.
25 * So the simplest way I came up with was to use strtoull and return
26 * -EINVAL if the value exceeds 32 bits."
27 *
28 * Update/Maintenance History:
29 *
30 * 12-Sep-2010 : Copied from iptables xtables.c
31 * - xtables_strtoui renamed to xstrtoui
32 * - xtables_strtoul renamed to xstrtoul
33 *
34 * Original License and code follows.
35 */
36
37#include "squid.h"
38#include "compat/xstrto.h"
39
40/*
41 * (C) 2000-2006 by the netfilter coreteam <coreteam@netfilter.org>:
42 *
43 * This program is free software; you can redistribute it and/or modify
44 * it under the terms of the GNU General Public License as published by
45 * the Free Software Foundation; either version 2 of the License, or
46 * (at your option) any later version.
47 *
48 * This program is distributed in the hope that it will be useful,
49 * but WITHOUT ANY WARRANTY; without even the implied warranty of
50 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
51 * GNU General Public License for more details.
52 *
53 * You should have received a copy of the GNU General Public License
54 * along with this program; if not, write to the Free Software
55 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
56 */
57
58#include <cerrno>
59
60bool
61xstrtoul(const char *s, char **end, unsigned long *value,
62 unsigned long min, unsigned long max)
63{
64 char *my_end = nullptr;
65
66 errno = 0;
67 unsigned long v = strtoul(s, &my_end, 0);
68
69 if (my_end == s)
70 return false;
71 if (end)
72 *end = my_end;
73
74 if (errno != ERANGE && min <= v && (max == 0 || v <= max)) {
75 if (value)
76 *value = v;
77 if (!end)
78 return *my_end == '\0';
79 return true;
80 }
81
82 return false;
83}
84
85bool
86xstrtoui(const char *s, char **end, unsigned int *value,
87 unsigned int min, unsigned int max)
88{
89 unsigned long v = 0;
90 bool ret = xstrtoul(s, end, &v, min, max);
91 if (value) {
92 *value = v;
93
94 if (v != static_cast<unsigned long>(*value)) {
95 return false;
96 }
97 }
98
99 return ret;
100}
101
102#endif /* SQUID_XSTRTO_C_ */
103
A const & max(A const &lhs, A const &rhs)
A const & min(A const &lhs, A const &rhs)
bool xstrtoul(const char *s, char **end, unsigned long *value, unsigned long min, unsigned long max)
Definition: xstrto.cc:61
bool xstrtoui(const char *s, char **end, unsigned int *value, unsigned int min, unsigned int max)
Definition: xstrto.cc:86

 

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