strtoull.c - vx32 - Local 9vx git repository for patches.
(HTM) git clone git://r-36.net/vx32
(DIR) Log
(DIR) Files
(DIR) Refs
---
strtoull.c (3427B)
---
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 * 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 <limits.h>
35 #include <errno.h>
36 #include <ctype.h>
37 #include <stdlib.h>
38
39 /*
40 * Convert a string to an unsigned long long integer.
41 *
42 * Assumes that the upper and lower case
43 * alphabets and digits are each contiguous.
44 */
45 unsigned long long
46 strtoull(const char * __restrict nptr, char ** __restrict endptr, int base)
47 {
48 const char *s;
49 unsigned long long acc;
50 char c;
51 unsigned long long cutoff;
52 int neg, any, cutlim;
53
54 /*
55 * See strtoq for comments as to the logic used.
56 */
57 s = nptr;
58 do {
59 c = *s++;
60 } while (isspace((unsigned char)c));
61 if (c == '-') {
62 neg = 1;
63 c = *s++;
64 } else {
65 neg = 0;
66 if (c == '+')
67 c = *s++;
68 }
69 if ((base == 0 || base == 16) &&
70 c == '0' && (*s == 'x' || *s == 'X') &&
71 ((s[1] >= '0' && s[1] <= '9') ||
72 (s[1] >= 'A' && s[1] <= 'F') ||
73 (s[1] >= 'a' && s[1] <= 'f'))) {
74 c = s[1];
75 s += 2;
76 base = 16;
77 }
78 if (base == 0)
79 base = c == '0' ? 8 : 10;
80 acc = any = 0;
81 if (base < 2 || base > 36)
82 goto noconv;
83
84 cutoff = ULLONG_MAX / base;
85 cutlim = ULLONG_MAX % base;
86 for ( ; ; c = *s++) {
87 if (c >= '0' && c <= '9')
88 c -= '0';
89 else if (c >= 'A' && c <= 'Z')
90 c -= 'A' - 10;
91 else if (c >= 'a' && c <= 'z')
92 c -= 'a' - 10;
93 else
94 break;
95 if (c >= base)
96 break;
97 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
98 any = -1;
99 else {
100 any = 1;
101 acc *= base;
102 acc += c;
103 }
104 }
105 if (any < 0) {
106 acc = ULLONG_MAX;
107 errno = ERANGE;
108 } else if (!any) {
109 noconv:
110 errno = EINVAL;
111 } else if (neg)
112 acc = -acc;
113 if (endptr != NULL)
114 *endptr = (char *)(any ? s - 1 : nptr);
115 return (acc);
116 }