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 */
62 long long strtoll (const char*, char **, int);
63
64 long long
strtoll(const char * nptr,char ** endptr,int base)65 strtoll(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) {
154 noconv:
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