1/*	$OpenBSD: strtoull.c,v 1.5 2005/08/08 08:05:37 espie Exp $ */
2/*-
3 * Copyright (c) 1992 The Regents of the University of California.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. 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/* OPENBSD ORIGINAL: lib/libc/stdlib/strtoull.c */
32
33#include "includes.h"
34#ifndef HAVE_STRTOULL
35
36#include <sys/types.h>
37
38#include <ctype.h>
39#include <errno.h>
40#include <limits.h>
41#include <stdlib.h>
42
43/*
44 * Convert a string to an unsigned long long.
45 *
46 * Ignores `locale' stuff.  Assumes that the upper and lower case
47 * alphabets and digits are each contiguous.
48 */
49unsigned long long
50strtoull(const char *nptr, char **endptr, int base)
51{
52	const char *s;
53	unsigned long long acc, cutoff;
54	int c;
55	int neg, any, cutlim;
56
57	/*
58	 * See strtoq for comments as to the logic used.
59	 */
60	s = nptr;
61	do {
62		c = (unsigned char) *s++;
63	} while (isspace(c));
64	if (c == '-') {
65		neg = 1;
66		c = *s++;
67	} else {
68		neg = 0;
69		if (c == '+')
70			c = *s++;
71	}
72	if ((base == 0 || base == 16) &&
73	    c == '0' && (*s == 'x' || *s == 'X')) {
74		c = s[1];
75		s += 2;
76		base = 16;
77	}
78	if (base == 0)
79		base = c == '0' ? 8 : 10;
80
81	cutoff = ULLONG_MAX / (unsigned long long)base;
82	cutlim = ULLONG_MAX % (unsigned long long)base;
83	for (acc = 0, any = 0;; c = (unsigned char) *s++) {
84		if (isdigit(c))
85			c -= '0';
86		else if (isalpha(c))
87			c -= isupper(c) ? 'A' - 10 : 'a' - 10;
88		else
89			break;
90		if (c >= base)
91			break;
92		if (any < 0)
93			continue;
94		if (acc > cutoff || (acc == cutoff && c > cutlim)) {
95			any = -1;
96			acc = ULLONG_MAX;
97			errno = ERANGE;
98		} else {
99			any = 1;
100			acc *= (unsigned long long)base;
101			acc += c;
102		}
103	}
104	if (neg && any > 0)
105		acc = -acc;
106	if (endptr != 0)
107		*endptr = (char *) (any ? s - 1 : nptr);
108	return (acc);
109}
110#endif /* !HAVE_STRTOULL */
111