1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27/*	Copyright (c) 1986 AT&T	*/
28/*	  All Rights Reserved  	*/
29
30#pragma ident	"%Z%%M%	%I%	%E% SMI"
31
32#ifndef	_WCS_LONGLONG
33#pragma weak _wcstoul = wcstoul
34#endif
35
36#include "lint.h"
37#include <limits.h>
38#include <errno.h>
39#include <wchar.h>
40#define	DIGIT(x)	(iswdigit(x) ? (x) - L'0' : \
41			iswlower(x) ? (x) + 10 - L'a' : (x) + 10 - L'A')
42#define	MBASE	(L'z' - L'a' + 1 + 10)
43
44#ifdef	_WCS_LONGLONG
45#define	_WULONG_T	unsigned long long
46#define	_WULONG_MAX	ULLONG_MAX
47#else  /* _WCS_LONGLONG */
48#define	_WULONG_T	unsigned long
49#define	_WULONG_MAX	ULONG_MAX
50#endif /* _WCS_LONGLONG */
51
52#ifdef	_WCS_LONGLONG
53unsigned long long
54wcstoull(const wchar_t *_RESTRICT_KYWD str, wchar_t **_RESTRICT_KYWD ptr,
55    int base)
56#else /* _WCS_LONGLONG */
57unsigned long
58wcstoul(const wchar_t *str, wchar_t **ptr, int base)
59#endif /* _WCS_LONGLONG */
60{
61	_WULONG_T	val;
62	wchar_t	c;
63	int	xx, neg = 0;
64	_WULONG_T	multmax;
65
66	if (ptr != NULL)
67		*ptr = (wchar_t *)str; /* in case no number is formed */
68	if (base < 0 || base > MBASE) {
69		errno = EINVAL;
70		return (0); /* base is invalid -- should be a fatal error */
71	}
72
73	if (!iswalnum(c = *str)) {
74		while (iswspace(c)) {
75			c = *++str;
76		}
77		switch (c) {
78		case L'-':
79			neg++;
80			/*FALLTHRU*/
81		case L'+':
82			c = *++str;
83		}
84	}
85	if (base == 0) {
86		if (c != L'0')
87			base = 10;
88		else if (str[1] == L'x' || str[1] == L'X')
89			base = 16;
90		else
91			base = 8;
92	}
93	/*
94	 * for any base > 10, the digits incrementally following
95	 *	9 are assumed to be "abc...z" or "ABC...Z"
96	 */
97	if (!iswalnum(c) || (xx = DIGIT(c)) >= base) {
98		errno = EINVAL;
99		return (0); /* no number formed */
100	}
101	if (base == 16 && c == L'0' && iswxdigit(str[2]) &&
102	    (str[1] == L'x' || str[1] == L'X')) {
103		c = *(str += 2); /* skip over leading "0x" or "0X" */
104	}
105
106	multmax = _WULONG_MAX / (_WULONG_T)base;
107	val = DIGIT(c);
108	for (; iswalnum(c = *++str) && (xx = DIGIT(c)) < base; ) {
109		/* accumulate neg avoids surprises near MAXLONG */
110		if (val > multmax)
111			goto overflow;
112		val *= base;
113		if (_WULONG_MAX - val < xx)
114			goto overflow;
115		val += xx;
116	}
117	if (ptr != NULL)
118		*ptr = (wchar_t *)str;
119	return (neg ? -val : val);
120
121overflow:
122	while (iswalnum(c = *++str) && (xx = DIGIT(c)) < base)
123		;
124
125	if (ptr != NULL)
126		*ptr = (wchar_t *)str;
127	errno = ERANGE;
128	return (_WULONG_MAX);
129}
130