1/*-
2 * Copyright (c) 1992, 1993
3 *	The Regents of the University of California.  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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30
31#include <limits.h>
32#ifdef HAVE_ERRNO_H
33#include <errno.h>
34#endif
35#include <stdlib.h>
36#ifdef DBUS_WINCE
37#include <windows.h>
38#endif
39
40#ifndef isspace
41#define isspace(c) ((c) == ' ' || (c) == '\t' || (c) == '\r' || (c) == '\n')
42#endif
43
44/* Minimum and maximum values a `signed long long int' can hold.  */
45#ifndef LLONG_MAX
46#   define LLONG_MAX	9223372036854775807LL
47#endif
48
49#ifndef LLONG_MIN
50#   define LLONG_MIN	(-LLONG_MAX - 1LL)
51#endif
52/* Maximum value an `unsigned long long int' can hold.  (Minimum is 0.)  */
53#ifndef ULLONG_MAX
54#   define ULLONG_MAX	18446744073709551615ULL
55#endif
56/*
57 * Convert a string to a long long integer.
58 *
59 * Assumes that the upper and lower case
60 * alphabets and digits are each contiguous.
61 */
62long long strtoll (const char*, char **, int);
63
64long long
65strtoll(const char * nptr, char ** endptr, int base)
66{
67	const char *s;
68	unsigned long long acc;
69	char c;
70	unsigned long long cutoff;
71	int neg, any, cutlim;
72
73	/*
74	 * Skip white space and pick up leading +/- sign if any.
75	 * If base is 0, allow 0x for hex and 0 for octal, else
76	 * assume decimal; if base is already 16, allow 0x.
77	 */
78	s = nptr;
79	do {
80		c = *s++;
81	} while (isspace((unsigned char)c));
82	if (c == '-') {
83		neg = 1;
84		c = *s++;
85	} else {
86		neg = 0;
87		if (c == '+')
88			c = *s++;
89	}
90	if ((base == 0 || base == 16) &&
91	    c == '0' && (*s == 'x' || *s == 'X') &&
92	    ((s[1] >= '0' && s[1] <= '9') ||
93	    (s[1] >= 'A' && s[1] <= 'F') ||
94	    (s[1] >= 'a' && s[1] <= 'f'))) {
95		c = s[1];
96		s += 2;
97		base = 16;
98	}
99	if (base == 0)
100		base = c == '0' ? 8 : 10;
101	acc = any = 0;
102	if (base < 2 || base > 36)
103		goto noconv;
104
105	/*
106	 * Compute the cutoff value between legal numbers and illegal
107	 * numbers.  That is the largest legal value, divided by the
108	 * base.  An input number that is greater than this value, if
109	 * followed by a legal input character, is too big.  One that
110	 * is equal to this value may be valid or not; the limit
111	 * between valid and invalid numbers is then based on the last
112	 * digit.  For instance, if the range for quads is
113	 * [-9223372036854775808..9223372036854775807] and the input base
114	 * is 10, cutoff will be set to 922337203685477580 and cutlim to
115	 * either 7 (neg==0) or 8 (neg==1), meaning that if we have
116	 * accumulated a value > 922337203685477580, or equal but the
117	 * next digit is > 7 (or 8), the number is too big, and we will
118	 * return a range error.
119	 *
120	 * Set 'any' if any `digits' consumed; make it negative to indicate
121	 * overflow.
122	 */
123	cutoff = neg ? (unsigned long long)-(LLONG_MIN + LLONG_MAX) + LLONG_MAX
124	    : LLONG_MAX;
125	cutlim = cutoff % base;
126	cutoff /= base;
127	for ( ; ; c = *s++) {
128		if (c >= '0' && c <= '9')
129			c -= '0';
130		else if (c >= 'A' && c <= 'Z')
131			c -= 'A' - 10;
132		else if (c >= 'a' && c <= 'z')
133			c -= 'a' - 10;
134		else
135			break;
136		if (c >= base)
137			break;
138		if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
139			any = -1;
140		else {
141			any = 1;
142			acc *= base;
143			acc += c;
144		}
145	}
146	if (any < 0) {
147		acc = neg ? LLONG_MIN : LLONG_MAX;
148#ifdef DBUS_WINCE
149		SetLastError (ERROR_ARITHMETIC_OVERFLOW);
150#else
151		errno = ERANGE;
152#endif
153	} else if (!any) {
154noconv:
155#ifdef DBUS_WINCE
156		SetLastError (ERROR_INVALID_PARAMETER);
157#else
158		errno = EINVAL;
159#endif
160	} else if (neg)
161		acc = -acc;
162	if (endptr != NULL)
163		*endptr = (char *)(any ? s - 1 : nptr);
164	return (acc);
165}
166
167