1 /*-
2 * Copyright (c) 2014 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. [rescinded 22 July 1999]
14 * 4. Neither the name of the University nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 /*
32
33 @deftypefn Supplemental {long long int} strtoll (const char *@var{string}, @
34 char **@var{endptr}, int @var{base})
35 @deftypefnx Supplemental {unsigned long long int} strtoul (@
36 const char *@var{string}, char **@var{endptr}, int @var{base})
37
38 The @code{strtoll} function converts the string in @var{string} to a
39 long long integer value according to the given @var{base}, which must be
40 between 2 and 36 inclusive, or be the special value 0. If @var{base}
41 is 0, @code{strtoll} will look for the prefixes @code{0} and @code{0x}
42 to indicate bases 8 and 16, respectively, else default to base 10.
43 When the base is 16 (either explicitly or implicitly), a prefix of
44 @code{0x} is allowed. The handling of @var{endptr} is as that of
45 @code{strtod} above. The @code{strtoull} function is the same, except
46 that the converted value is unsigned.
47
48 @end deftypefn
49
50 */
51
52 #ifdef HAVE_CONFIG_H
53 #include "config.h"
54 #endif
55 #ifdef HAVE_LIMITS_H
56 #include <limits.h>
57 #endif
58 #ifdef HAVE_SYS_PARAM_H
59 #include <sys/param.h>
60 #endif
61 #include <errno.h>
62 #ifdef NEED_DECLARATION_ERRNO
63 extern int errno;
64 #endif
65 #include "safe-ctype.h"
66
67 #ifdef HAVE_LONG_LONG
68
69 __extension__
70 typedef unsigned long long ullong_type;
71
72 __extension__
73 typedef long long llong_type;
74
75 /* FIXME: It'd be nice to configure around these, but the include files are too
76 painful. These macros should at least be more portable than hardwired hex
77 constants. */
78
79 #ifndef ULLONG_MAX
80 #define ULLONG_MAX (~(ullong_type)0) /* 0xFFFFFFFFFFFFFFFF */
81 #endif
82
83 #ifndef LLONG_MAX
84 #define LLONG_MAX ((llong_type)(ULLONG_MAX >> 1)) /* 0x7FFFFFFFFFFFFFFF */
85 #endif
86
87 #ifndef LLONG_MIN
88 #define LLONG_MIN (~LLONG_MAX) /* 0x8000000000000000 */
89 #endif
90
91 /*
92 * Convert a string to a long long integer.
93 *
94 * Ignores `locale' stuff. Assumes that the upper and lower case
95 * alphabets and digits are each contiguous.
96 */
97 llong_type
98 strtoll(const char *nptr, char **endptr, register int base)
99 {
100 register const char *s = nptr;
101 register ullong_type acc;
102 register int c;
103 register ullong_type cutoff;
104 register int neg = 0, any, cutlim;
105
106 /*
107 * Skip white space and pick up leading +/- sign if any.
108 * If base is 0, allow 0x for hex and 0 for octal, else
109 * assume decimal; if base is already 16, allow 0x.
110 */
111 do {
112 c = *s++;
113 } while (ISSPACE(c));
114 if (c == '-') {
115 neg = 1;
116 c = *s++;
117 } else if (c == '+')
118 c = *s++;
119 if ((base == 0 || base == 16) &&
120 c == '0' && (*s == 'x' || *s == 'X')) {
121 c = s[1];
122 s += 2;
123 base = 16;
124 }
125 if (base == 0)
126 base = c == '0' ? 8 : 10;
127
128 /*
129 * Compute the cutoff value between legal numbers and illegal
130 * numbers. That is the largest legal value, divided by the
131 * base. An input number that is greater than this value, if
132 * followed by a legal input character, is too big. One that
133 * is equal to this value may be valid or not; the limit
134 * between valid and invalid numbers is then based on the last
135 * digit. For instance, if the range for longs is
136 * [-2147483648..2147483647] and the input base is 10,
137 * cutoff will be set to 214748364 and cutlim to either
138 * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
139 * a value > 214748364, or equal but the next digit is > 7 (or 8),
140 * the number is too big, and we will return a range error.
141 *
142 * Set any if any `digits' consumed; make it negative to indicate
143 * overflow.
144 */
145 cutoff = neg ? -(ullong_type)LLONG_MIN : LLONG_MAX;
146 cutlim = cutoff % (ullong_type)base;
147 cutoff /= (ullong_type)base;
148 for (acc = 0, any = 0;; c = *s++) {
149 if (ISDIGIT(c))
150 c -= '0';
151 else if (ISALPHA(c))
152 c -= ISUPPER(c) ? 'A' - 10 : 'a' - 10;
153 else
154 break;
155 if (c >= base)
156 break;
157 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
158 any = -1;
159 else {
160 any = 1;
161 acc *= base;
162 acc += c;
163 }
164 }
165 if (any < 0) {
166 acc = neg ? LLONG_MIN : LLONG_MAX;
167 errno = ERANGE;
168 } else if (neg)
169 acc = -acc;
170 if (endptr != 0)
171 *endptr = (char *) (any ? s - 1 : nptr);
172 return (acc);
173 }
174
175 #endif /* ifdef HAVE_LONG_LONG */