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5b2abdfb 1/*-
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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 * 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
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34#if defined(LIBC_SCCS) && !defined(lint)
35static char sccsid[] = "@(#)strtoq.c 8.1 (Berkeley) 6/4/93";
36#endif /* LIBC_SCCS and not lint */
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37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: src/lib/libc/stdlib/strtoll.c,v 1.19 2002/09/06 11:23:59 tjr Exp $");
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39
40#include <limits.h>
41#include <errno.h>
42#include <ctype.h>
43#include <stdlib.h>
44
45/*
5b2abdfb 46 * Convert a string to a long long integer.
e9ce8d39 47 *
9385eb3d 48 * Assumes that the upper and lower case
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49 * alphabets and digits are each contiguous.
50 */
5b2abdfb 51long long
9385eb3d 52strtoll(const char * __restrict nptr, char ** __restrict endptr, int base)
e9ce8d39 53{
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54 const char *s;
55 unsigned long long acc;
56 char c;
57 unsigned long long cutoff;
58 int neg, any, cutlim;
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59
60 /*
61 * Skip white space and pick up leading +/- sign if any.
62 * If base is 0, allow 0x for hex and 0 for octal, else
63 * assume decimal; if base is already 16, allow 0x.
64 */
65 s = nptr;
66 do {
67 c = *s++;
9385eb3d 68 } while (isspace((unsigned char)c));
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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;
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85 acc = any = 0;
86 if (base < 2 || base > 36)
87 goto noconv;
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88
89 /*
90 * Compute the cutoff value between legal numbers and illegal
91 * numbers. That is the largest legal value, divided by the
92 * base. An input number that is greater than this value, if
93 * followed by a legal input character, is too big. One that
94 * is equal to this value may be valid or not; the limit
95 * between valid and invalid numbers is then based on the last
96 * digit. For instance, if the range for quads is
97 * [-9223372036854775808..9223372036854775807] and the input base
98 * is 10, cutoff will be set to 922337203685477580 and cutlim to
99 * either 7 (neg==0) or 8 (neg==1), meaning that if we have
100 * accumulated a value > 922337203685477580, or equal but the
101 * next digit is > 7 (or 8), the number is too big, and we will
102 * return a range error.
103 *
9385eb3d 104 * Set 'any' if any `digits' consumed; make it negative to indicate
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105 * overflow.
106 */
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107 cutoff = neg ? (unsigned long long)-(LLONG_MIN + LLONG_MAX) + LLONG_MAX
108 : LLONG_MAX;
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109 cutlim = cutoff % base;
110 cutoff /= base;
111 for ( ; ; c = *s++) {
112 if (c >= '0' && c <= '9')
e9ce8d39 113 c -= '0';
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114 else if (c >= 'A' && c <= 'Z')
115 c -= 'A' - 10;
116 else if (c >= 'a' && c <= 'z')
117 c -= 'a' - 10;
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118 else
119 break;
120 if (c >= base)
121 break;
5b2abdfb 122 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
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123 any = -1;
124 else {
125 any = 1;
9385eb3d 126 acc *= base;
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127 acc += c;
128 }
129 }
130 if (any < 0) {
5b2abdfb 131 acc = neg ? LLONG_MIN : LLONG_MAX;
e9ce8d39 132 errno = ERANGE;
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133 } else if (!any) {
134noconv:
135 errno = EINVAL;
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136 } else if (neg)
137 acc = -acc;
9385eb3d 138 if (endptr != NULL)
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139 *endptr = (char *)(any ? s - 1 : nptr);
140 return (acc);
141}