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 [rescinded 22 July 1999]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
38The @code{strtoll} function converts the string in @var{string} to a
39long long integer value according to the given @var{base}, which must be
40between 2 and 36 inclusive, or be the special value 0.  If @var{base}
41is 0, @code{strtoll} will look for the prefixes @code{0} and @code{0x}
42to indicate bases 8 and 16, respectively, else default to base 10.
43When 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
46that 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
63extern int errno;
64#endif
65#include "safe-ctype.h"
66
67#ifdef HAVE_LONG_LONG
68
69__extension__
70typedef unsigned long long ullong_type;
71
72__extension__
73typedef 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 */
97llong_type
98strtoll(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 */
176