1/*
2 * Copyright (c) 1990, 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 "port_before.h"
35
36#include <sys/types.h>
37#include <sys/param.h>
38
39#include <ctype.h>
40#include <errno.h>
41#include <limits.h>
42#include <stdlib.h>
43
44#include "port_after.h"
45
46#ifndef NEED_STRTOUL
47int __strtoul_unneeded__;
48#else
49
50/*%
51 * Convert a string to an unsigned long integer.
52 *
53 * Ignores `locale' stuff.  Assumes that the upper and lower case
54 * alphabets and digits are each contiguous.
55 */
56u_long
57strtoul(const char *nptr, char **endptr, int base) {
58	const char *s = nptr;
59	u_long acc, cutoff;
60	int neg, c, any, cutlim;
61
62	neg = 0;
63
64	/*
65	 * See strtol for comments as to the logic used.
66	 */
67	do {
68		c = *(const unsigned char *)s++;
69	} while (isspace(c));
70	if (c == '-') {
71		neg = 1;
72		c = *s++;
73	} else if (c == '+')
74		c = *s++;
75	if ((base == 0 || base == 16) &&
76	    c == '0' && (*s == 'x' || *s == 'X')) {
77		c = s[1];
78		s += 2;
79		base = 16;
80	}
81	if (base == 0)
82		base = c == '0' ? 8 : 10;
83	cutoff = (u_long)ULONG_MAX / (u_long)base;
84	cutlim = (u_long)ULONG_MAX % (u_long)base;
85	for (acc = 0, any = 0;; c = *(const unsigned char*)s++) {
86		if (isdigit(c))
87			c -= '0';
88		else if (isalpha(c))
89			c -= isupper(c) ? 'A' - 10 : 'a' - 10;
90		else
91			break;
92		if (c >= base)
93			break;
94		if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
95			any = -1;
96		else {
97			any = 1;
98			acc *= base;
99			acc += c;
100		}
101	}
102	if (any < 0) {
103		acc = ULONG_MAX;
104		errno = ERANGE;
105	} else if (neg)
106		acc = -acc;
107	if (endptr != 0)
108		DE_CONST((any ? s - 1 : nptr), *endptr);
109	return (acc);
110}
111
112#endif /*NEED_STRTOUL*/
113
114/*! \file */
115