strtoll.c
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1 /*
2  * Copyright (C) 1996-2017 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 /*-
10  * Copyright (c) 1990 The Regents of the University of California.
11  * All rights reserved.
12  *
13  * Redistribution and use in source and binary forms, with or without
14  * modification, are permitted provided that the following conditions
15  * are met:
16  * 1. Redistributions of source code must retain the above copyright
17  * notice, this list of conditions and the following disclaimer.
18  * 2. Redistributions in binary form must reproduce the above copyright
19  * notice, this list of conditions and the following disclaimer in the
20  * documentation and/or other materials provided with the distribution.
21  * 3. All advertising materials mentioning features or use of this software
22  * must display the following acknowledgement:
23  * This product includes software developed by the University of
24  * California, Berkeley and its contributors.
25  * 4. Neither the name of the University nor the names of its contributors
26  * may be used to endorse or promote products derived from this software
27  * without specific prior written permission.
28  *
29  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32  * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39  * SUCH DAMAGE.
40  */
41 
42 /* modified for long long <mgd@swarm.org> 1999-08-12 */
43 
44 #include "squid.h"
45 #include "compat/strtoll.h"
46 
47 #if HAVE_CTYPE_H
48 #include <ctype.h>
49 #endif
50 #if HAVE_ERRNO_H
51 #include <errno.h>
52 #endif
53 
54 #ifndef INT64_MIN
55 /* Native 64 bit system without strtoll() */
56 #if defined(LONG_MIN) && (SIZEOF_LONG == 8)
57 #define INT64_MIN LONG_MIN
58 #else
59 /* 32 bit system */
60 #define INT64_MIN (-9223372036854775807LL-1LL)
61 #endif
62 #endif
63 
64 #ifndef INT64_MAX
65 /* Native 64 bit system without strtoll() */
66 #if defined(LONG_MAX) && (SIZEOF_LONG == 8)
67 #define INT64_MAX LONG_MAX
68 #else
69 /* 32 bit system */
70 #define INT64_MAX 9223372036854775807LL
71 #endif
72 #endif
73 
74 /*
75  * Convert a string to a int64 integer.
76  *
77  * Ignores `locale' stuff. Assumes that the upper and lower case
78  * alphabets and digits are each contiguous.
79  */
80 int64_t
81 strtoll (const char *nptr, char **endptr, int base)
82 {
83  register const char *s = nptr;
84  register uint64_t acc;
85  register int c;
86  register uint64_t cutoff;
87  register int neg = 0, any, cutlim;
88 
89  /*
90  * Skip white space and pick up leading +/- sign if any.
91  * If base is 0, allow 0x for hex and 0 for octal, else
92  * assume decimal; if base is already 16, allow 0x.
93  */
94  do {
95  c = *s++;
96  } while (xisspace(c));
97  if (c == '-') {
98  neg = 1;
99  c = *s++;
100  } else if (c == '+')
101  c = *s++;
102  if ((base == 0 || base == 16) && c == '0' && (*s == 'x' || *s == 'X')) {
103  c = s[1];
104  s += 2;
105  base = 16;
106  }
107  if (base == 0)
108  base = c == '0' ? 8 : 10;
109 
110  /*
111  * Compute the cutoff value between legal numbers and illegal
112  * numbers. That is the largest legal value, divided by the
113  * base. An input number that is greater than this value, if
114  * followed by a legal input character, is too big. One that
115  * is equal to this value may be valid or not; the limit
116  * between valid and invalid numbers is then based on the last
117  * digit. For instance, if the range for longs is
118  * [-2147483648..2147483647] and the input base is 10,
119  * cutoff will be set to 214748364 and cutlim to either
120  * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
121  * a value > 214748364, or equal but the next digit is > 7 (or 8),
122  * the number is too big, and we will return a range error.
123  *
124  * Set any if any `digits' consumed; make it negative to indicate
125  * overflow.
126  */
127  cutoff = neg ? -(uint64_t) INT64_MIN : INT64_MAX;
128  cutlim = cutoff % (uint64_t) base;
129  cutoff /= (uint64_t) base;
130  for (acc = 0, any = 0;; c = *s++) {
131  if (xisdigit(c))
132  c -= '0';
133  else if (xisalpha(c))
134  c -= xisupper(c) ? 'A' - 10 : 'a' - 10;
135  else
136  break;
137  if (c >= base)
138  break;
139  if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
140  any = -1;
141  else {
142  any = 1;
143  acc *= base;
144  acc += c;
145  }
146  }
147  if (any < 0) {
148  acc = neg ? INT64_MIN : INT64_MAX;
149  errno = ERANGE;
150  } else if (neg)
151  acc = -acc;
152  if (endptr != 0)
153  *endptr = (char *) (any ? s - 1 : nptr);
154  return acc;
155 }
156 
#define xisspace(x)
Definition: xis.h:17
#define INT64_MAX
Definition: strtoll.c:70
#define xisdigit(x)
Definition: xis.h:20
#define xisupper(x)
Definition: xis.h:28
int64_t strtoll(const char *nptr, char **endptr, int base)
Definition: strtoll.c:81
#define xisalpha(x)
Definition: xis.h:23
#define INT64_MIN
Definition: strtoll.c:60

 

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