1 /* $OpenBSD: strtoull.c,v 1.5 2005/08/08 08:05:37 espie Exp $ */
2 /*-
3 * Copyright (c) 1992 The Regents of the University of California.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the University nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 /* OPENBSD ORIGINAL: lib/libc/stdlib/strtoull.c */
32
33 #include "includes.h"
34 #ifndef HAVE_STRTOULL
35
36 #include <sys/types.h>
37
38 #include <ctype.h>
39 #include <errno.h>
40 #include <limits.h>
41 #include <stdlib.h>
42
43 /*
44 * Convert a string to an unsigned long long.
45 *
46 * Ignores `locale' stuff. Assumes that the upper and lower case
47 * alphabets and digits are each contiguous.
48 */
49 unsigned long long
strtoull(const char * nptr,char ** endptr,int base)50 strtoull(const char *nptr, char **endptr, int base)
51 {
52 const char *s;
53 unsigned long long acc, cutoff;
54 int c;
55 int neg, any, cutlim;
56
57 /*
58 * See strtoq for comments as to the logic used.
59 */
60 s = nptr;
61 do {
62 c = (unsigned char) *s++;
63 } while (isspace(c));
64 if (c == '-') {
65 neg = 1;
66 c = *s++;
67 } else {
68 neg = 0;
69 if (c == '+')
70 c = *s++;
71 }
72 if ((base == 0 || base == 16) &&
73 c == '0' && (*s == 'x' || *s == 'X')) {
74 c = s[1];
75 s += 2;
76 base = 16;
77 }
78 if (base == 0)
79 base = c == '0' ? 8 : 10;
80
81 cutoff = ULLONG_MAX / (unsigned long long)base;
82 cutlim = ULLONG_MAX % (unsigned long long)base;
83 for (acc = 0, any = 0;; c = (unsigned char) *s++) {
84 if (isdigit(c))
85 c -= '0';
86 else if (isalpha(c))
87 c -= isupper(c) ? 'A' - 10 : 'a' - 10;
88 else
89 break;
90 if (c >= base)
91 break;
92 if (any < 0)
93 continue;
94 if (acc > cutoff || (acc == cutoff && c > cutlim)) {
95 any = -1;
96 acc = ULLONG_MAX;
97 errno = ERANGE;
98 } else {
99 any = 1;
100 acc *= (unsigned long long)base;
101 acc += c;
102 }
103 }
104 if (neg && any > 0)
105 acc = -acc;
106 if (endptr != 0)
107 *endptr = (char *) (any ? s - 1 : nptr);
108 return (acc);
109 }
110 #endif /* !HAVE_STRTOULL */
111