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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if defined(LIBC_SCCS) && !defined(lint)
31static char sccsid[] = "@(#)strtoul.c	8.1 (Berkeley) 6/4/93";
32#endif /* LIBC_SCCS and not lint */
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: src/lib/libc/stdlib/strtoul.c,v 1.19 2007/01/09 00:28:10 imp Exp $");
35
36#include "xlocale_private.h"
37
38#include <limits.h>
39#include <ctype.h>
40#include <errno.h>
41#include <stdlib.h>
42
43/*
44 * Convert a string to an unsigned long integer.
45 *
46 * Assumes that the upper and lower case
47 * alphabets and digits are each contiguous.
48 */
49unsigned long
50strtoul_l(const char * __restrict nptr, char ** __restrict endptr, int base,
51    locale_t loc)
52{
53	const char *s;
54	unsigned long acc;
55	char c;
56	unsigned long cutoff;
57	int neg, any, cutlim;
58
59	NORMALIZE_LOCALE(loc);
60	/*
61	 * See strtol for comments as to the logic used.
62	 */
63	s = nptr;
64	do {
65		c = *s++;
66	} while (isspace_l((unsigned char)c, loc));
67	if (c == '-') {
68		neg = 1;
69		c = *s++;
70	} else {
71		neg = 0;
72		if (c == '+')
73			c = *s++;
74	}
75	if ((base == 0 || base == 16) &&
76	    c == '0' && (*s == 'x' || *s == 'X') &&
77	    ((s[1] >= '0' && s[1] <= '9') ||
78	    (s[1] >= 'A' && s[1] <= 'F') ||
79	    (s[1] >= 'a' && s[1] <= 'f'))) {
80		c = s[1];
81		s += 2;
82		base = 16;
83	}
84	if (base == 0)
85		base = c == '0' ? 8 : 10;
86	acc = any = 0;
87	if (base < 2 || base > 36)
88		goto noconv;
89
90	cutoff = ULONG_MAX / base;
91	cutlim = ULONG_MAX % base;
92	for ( ; ; c = *s++) {
93		if (c >= '0' && c <= '9')
94			c -= '0';
95		else if (c >= 'A' && c <= 'Z')
96			c -= 'A' - 10;
97		else if (c >= 'a' && c <= 'z')
98			c -= 'a' - 10;
99		else
100			break;
101		if (c >= base)
102			break;
103		if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
104			any = -1;
105		else {
106			any = 1;
107			acc *= base;
108			acc += c;
109		}
110	}
111	if (any < 0) {
112		acc = ULONG_MAX;
113		errno = ERANGE;
114	} else if (!any) {
115noconv:
116		errno = EINVAL;
117	} else if (neg)
118		acc = -acc;
119	if (endptr != NULL)
120		*endptr = (char *)(any ? s - 1 : nptr);
121	return (acc);
122}
123
124unsigned long
125strtoul(const char * __restrict nptr, char ** __restrict endptr, int base)
126{
127	return strtoul_l(nptr, endptr, base, __current_locale());
128}
129