1/*
2 * Copyright (c) 2014 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 [rescinded 22 July 1999]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#ifdef HAVE_CONFIG_H
32#include "config.h"
33#endif
34#ifdef HAVE_LIMITS_H
35#include <limits.h>
36#endif
37#ifdef HAVE_SYS_PARAM_H
38#include <sys/param.h>
39#endif
40#include <errno.h>
41#ifdef NEED_DECLARATION_ERRNO
42extern int errno;
43#endif
44#if 0
45#include <stdlib.h>
46#endif
47#include "ansidecl.h"
48#include "safe-ctype.h"
49
50#ifdef HAVE_LONG_LONG
51
52__extension__
53typedef unsigned long long ullong_type;
54
55#ifndef ULLONG_MAX
56#define ULLONG_MAX (~(ullong_type)0) /* 0xFFFFFFFFFFFFFFFF */
57#endif
58
59/*
60 * Convert a string to an unsigned long long integer.
61 *
62 * Ignores `locale' stuff.  Assumes that the upper and lower case
63 * alphabets and digits are each contiguous.
64 */
65ullong_type
66strtoull(const char *nptr, char **endptr, register int base)
67{
68	register const char *s = nptr;
69	register ullong_type acc;
70	register int c;
71	register ullong_type cutoff;
72	register int neg = 0, any, cutlim;
73
74	/*
75	 * See strtol for comments as to the logic used.
76	 */
77	do {
78		c = *s++;
79	} while (ISSPACE(c));
80	if (c == '-') {
81		neg = 1;
82		c = *s++;
83	} else if (c == '+')
84		c = *s++;
85	if ((base == 0 || base == 16) &&
86	    c == '0' && (*s == 'x' || *s == 'X')) {
87		c = s[1];
88		s += 2;
89		base = 16;
90	}
91	if (base == 0)
92		base = c == '0' ? 8 : 10;
93	cutoff = (ullong_type)ULLONG_MAX / (ullong_type)base;
94	cutlim = (ullong_type)ULLONG_MAX % (ullong_type)base;
95	for (acc = 0, any = 0;; c = *s++) {
96		if (ISDIGIT(c))
97			c -= '0';
98		else if (ISALPHA(c))
99			c -= ISUPPER(c) ? 'A' - 10 : 'a' - 10;
100		else
101			break;
102		if (c >= base)
103			break;
104		if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
105			any = -1;
106		else {
107			any = 1;
108			acc *= base;
109			acc += c;
110		}
111	}
112	if (any < 0) {
113		acc = ULLONG_MAX;
114		errno = ERANGE;
115	} else if (neg)
116		acc = -acc;
117	if (endptr != 0)
118		*endptr = (char *) (any ? s - 1 : nptr);
119	return (acc);
120}
121
122#endif /* ifdef HAVE_LONG_LONG */
123