nataraid(4): Add devstat support.
[dragonfly.git] / sys / libkern / strtoul.c
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1/*-
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Chris Torek.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * From: static char sccsid[] = "@(#)strtoul.c 8.1 (Berkeley) 6/4/93";
37 *
38 * $FreeBSD: src/sys/libkern/strtoul.c,v 1.3 1999/12/01 22:56:51 archie Exp $
39 */
40
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/ctype.h>
44#include <machine/limits.h>
45
46/*
47 * Convert a string to an unsigned long integer.
48 *
49 * Ignores `locale' stuff. Assumes that the upper and lower case
50 * alphabets and digits are each contiguous.
51 */
52unsigned long
e73e0a5e 53strtoul(const char *nptr, char **endptr, int base)
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54{
55 const char *s = nptr;
56 unsigned long acc;
57 unsigned char c;
58 unsigned long cutoff;
59 int neg = 0, any, cutlim;
60
61 /*
62 * See strtol for comments as to the logic used.
63 */
64 do {
65 c = *s++;
66 } while (isspace(c));
67 if (c == '-') {
68 neg = 1;
69 c = *s++;
70 } else if (c == '+')
71 c = *s++;
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 cutoff = (unsigned long)ULONG_MAX / (unsigned long)base;
81 cutlim = (unsigned long)ULONG_MAX % (unsigned long)base;
82 for (acc = 0, any = 0;; c = *s++) {
83 if (!isascii(c))
84 break;
85 if (isdigit(c))
86 c -= '0';
87 else if (isalpha(c))
88 c -= isupper(c) ? 'A' - 10 : 'a' - 10;
89 else
90 break;
91 if (c >= base)
92 break;
93 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
94 any = -1;
95 else {
96 any = 1;
97 acc *= base;
98 acc += c;
99 }
100 }
101 if (any < 0) {
102 acc = ULONG_MAX;
103 } else if (neg)
104 acc = -acc;
4090d6ff 105 if (endptr != NULL)
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106 *((const char **)endptr) = any ? s - 1 : nptr;
107 return (acc);
108}