strtoull.c revision 82982 
1227825Stheraven/*-
2227825Stheraven * Copyright (c) 1992, 1993
3227825Stheraven *	The Regents of the University of California.  All rights reserved.
4227825Stheraven *
5227825Stheraven * Redistribution and use in source and binary forms, with or without
6227825Stheraven * modification, are permitted provided that the following conditions
7227825Stheraven * are met:
8227825Stheraven * 1. Redistributions of source code must retain the above copyright
9227825Stheraven *    notice, this list of conditions and the following disclaimer.
10227825Stheraven * 2. Redistributions in binary form must reproduce the above copyright
11227825Stheraven *    notice, this list of conditions and the following disclaimer in the
12227825Stheraven *    documentation and/or other materials provided with the distribution.
13227825Stheraven * 3. All advertising materials mentioning features or use of this software
14227825Stheraven *    must display the following acknowledgement:
15227825Stheraven *	This product includes software developed by the University of
16227825Stheraven *	California, Berkeley and its contributors.
17227825Stheraven * 4. Neither the name of the University nor the names of its contributors
18227825Stheraven *    may be used to endorse or promote products derived from this software
19227825Stheraven *    without specific prior written permission.
20227825Stheraven *
21227825Stheraven * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22227825Stheraven * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23227825Stheraven * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24227825Stheraven * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25227825Stheraven * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26227825Stheraven * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27227825Stheraven * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28227825Stheraven * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29227825Stheraven * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30227825Stheraven * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31227825Stheraven * SUCH DAMAGE.
32227825Stheraven */
33227825Stheraven
34227825Stheraven#if defined(LIBC_SCCS) && !defined(lint)
35227825Stheravenstatic char sccsid[] = "@(#)strtouq.c	8.1 (Berkeley) 6/4/93";
36227825Stheraven#endif /* LIBC_SCCS and not lint */
37227825Stheraven
38227825Stheraven#ifndef lint
39227825Stheravenstatic const char rcsid[] =
40227825Stheraven  "$FreeBSD: head/lib/libc/stdlib/strtoull.c 82982 2001-09-04 17:12:15Z ache $";
41227825Stheraven#endif
42227825Stheraven
43227825Stheraven#include <sys/types.h>
44227825Stheraven
45227825Stheraven#include <limits.h>
46227825Stheraven#include <errno.h>
47227825Stheraven#include <ctype.h>
48227825Stheraven#include <stdlib.h>
49227825Stheraven
50227825Stheraven/*
51227825Stheraven * Convert a string to an unsigned long long integer.
52227825Stheraven *
53227825Stheraven * Assumes that the upper and lower case
54227825Stheraven * alphabets and digits are each contiguous.
55 */
56unsigned long long
57strtoull(nptr, endptr, base)
58	const char *nptr;
59	char **endptr;
60	register int base;
61{
62	register const char *s;
63	register unsigned long long acc;
64	register unsigned char c;
65	register unsigned long long cutoff;
66	register int neg, any, cutlim;
67
68	/*
69	 * See strtoq for comments as to the logic used.
70	 */
71	s = nptr;
72	do {
73		c = *s++;
74	} while (isspace(c));
75	if (c == '-') {
76		neg = 1;
77		c = *s++;
78	} else {
79		neg = 0;
80		if (c == '+')
81			c = *s++;
82	}
83	if ((base == 0 || base == 16) &&
84	    c == '0' && (*s == 'x' || *s == 'X')) {
85		c = s[1];
86		s += 2;
87		base = 16;
88	}
89	if (base == 0)
90		base = c == '0' ? 8 : 10;
91	acc = any = 0;
92	if (base < 2 || base > 36)
93		goto noconv;
94
95	cutoff = ULLONG_MAX / base;
96	cutlim = ULLONG_MAX % base;
97	for ( ; ; c = *s++) {
98		if (!isascii(c))
99			break;
100		if (isdigit(c))
101			c -= '0';
102		else if (isalpha(c))
103			c -= isupper(c) ? 'A' - 10 : 'a' - 10;
104		else
105			break;
106		if (c >= base)
107			break;
108		if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
109			any = -1;
110		else {
111			any = 1;
112			acc *= base;
113			acc += c;
114		}
115	}
116	if (any < 0) {
117		acc = ULLONG_MAX;
118		errno = ERANGE;
119	} else if (!any) {
120noconv:
121		errno = EINVAL;
122	} else if (neg)
123		acc = -acc;
124	if (endptr != NULL)
125		*endptr = (char *)(any ? s - 1 : nptr);
126	return (acc);
127}
128