1/*-
2 * Copyright (c) 1992 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. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <sys/types.h>
35
36#include <ctype.h>
37#include <errno.h>
38//#include <limits.h>
39#include <stdlib.h>
40
41#include <errno_private.h>
42
43
44#define UQUAD_MAX 0xffffffffffffffffULL
45/*
46 * Convert a string to an unsigned quad integer.
47 *
48 * Ignores `locale' stuff.  Assumes that the upper and lower case
49 * alphabets and digits are each contiguous.
50 */
51uint64
52strtouq(nptr, endptr, base)
53	const char *nptr;
54	char **endptr;
55	register int base;
56{
57	register const char *s;
58	register uint64 acc, cutoff;
59	register int c;
60	register int neg, any, cutlim;
61
62	/*
63	 * See strtoq for comments as to the logic used.
64	 */
65	s = nptr;
66	do {
67		c = (unsigned char) *s++;
68	} while (isspace(c));
69	if (c == '-') {
70		neg = 1;
71		c = *s++;
72	} else {
73		neg = 0;
74		if (c == '+')
75			c = *s++;
76	}
77	if ((base == 0 || base == 16) &&
78	    c == '0' && (*s == 'x' || *s == 'X')) {
79		c = s[1];
80		s += 2;
81		base = 16;
82	}
83	if (base == 0)
84		base = c == '0' ? 8 : 10;
85
86	cutoff = UQUAD_MAX / (uint64)base;
87	cutlim = UQUAD_MAX % (uint64)base;
88	for (acc = 0, any = 0;; c = (unsigned char) *s++) {
89		if (isdigit(c))
90			c -= '0';
91		else if (isalpha(c))
92			c -= isupper(c) ? 'A' - 10 : 'a' - 10;
93		else
94			break;
95		if (c >= base)
96			break;
97		if (any < 0)
98			continue;
99		if (acc > cutoff || (acc == cutoff && c > cutlim)) {
100			any = -1;
101			acc = UQUAD_MAX;
102			__set_errno(ERANGE);
103		} else {
104			any = 1;
105			acc *= (uint64)base;
106			acc += c;
107		}
108	}
109	if (neg && any > 0)
110		acc = -acc;
111	if (endptr != 0)
112		*endptr = (char *) (any ? s - 1 : nptr);
113	return (acc);
114}
115