1/*
2 * Copyright (c) 1990 Regents of the University of California.
3 * 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. [rescinded 22 July 1999]
14 * 4. 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#ifdef HAVE_CONFIG_H
32#include "config.h"
33#endif
34#ifdef HAVE_LIMITS_H
35#include <limits.h>
36#endif
37#ifdef HAVE_SYS_PARAM_H
38#include <sys/param.h>
39#endif
40#include <errno.h>
41#ifdef NEED_DECLARATION_ERRNO
42extern int errno;
43#endif
44#if 0
45#include <stdlib.h>
46#endif
47#include "ansidecl.h"
48#include "safe-ctype.h"
49
50#ifndef ULONG_MAX
51#define	ULONG_MAX	((unsigned long)(~0L))		/* 0xFFFFFFFF */
52#endif
53
54/*
55 * Convert a string to an unsigned long integer.
56 *
57 * Ignores `locale' stuff.  Assumes that the upper and lower case
58 * alphabets and digits are each contiguous.
59 */
60unsigned long
61strtoul(const char *nptr, char **endptr, register int base)
62{
63	register const char *s = nptr;
64	register unsigned long acc;
65	register int c;
66	register unsigned long cutoff;
67	register int neg = 0, any, cutlim;
68
69	/*
70	 * See strtol for comments as to the logic used.
71	 */
72	do {
73		c = *s++;
74	} while (ISSPACE(c));
75	if (c == '-') {
76		neg = 1;
77		c = *s++;
78	} else if (c == '+')
79		c = *s++;
80	if ((base == 0 || base == 16) &&
81	    c == '0' && (*s == 'x' || *s == 'X')) {
82		c = s[1];
83		s += 2;
84		base = 16;
85	}
86	if (base == 0)
87		base = c == '0' ? 8 : 10;
88	cutoff = (unsigned long)ULONG_MAX / (unsigned long)base;
89	cutlim = (unsigned long)ULONG_MAX % (unsigned long)base;
90	for (acc = 0, any = 0;; c = *s++) {
91		if (ISDIGIT(c))
92			c -= '0';
93		else if (ISALPHA(c))
94			c -= ISUPPER(c) ? 'A' - 10 : 'a' - 10;
95		else
96			break;
97		if (c >= base)
98			break;
99		if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
100			any = -1;
101		else {
102			any = 1;
103			acc *= base;
104			acc += c;
105		}
106	}
107	if (any < 0) {
108		acc = ULONG_MAX;
109		errno = ERANGE;
110	} else if (neg)
111		acc = -acc;
112	if (endptr != 0)
113		*endptr = (char *) (any ? s - 1 : nptr);
114	return (acc);
115}
116