wcstoul.c revision 1219:f89f56c2d9ac 
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, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22
23/*
24 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
25 * Use is subject to license terms.
26 */
27
28#pragma ident	"%Z%%M%	%I%	%E% SMI"
29
30/*	Copyright (c) 1986 AT&T	*/
31/*	  All Rights Reserved  	*/
32
33
34#ifndef	_WCS_LONGLONG
35#pragma weak wcstoul = _wcstoul
36#endif
37
38#include "synonyms.h"
39#include <limits.h>
40#include <errno.h>
41#include <wchar.h>
42#define	DIGIT(x)	(iswdigit(x) ? (x) - L'0' : \
43			iswlower(x) ? (x) + 10 - L'a' : (x) + 10 - L'A')
44#define	MBASE	(L'z' - L'a' + 1 + 10)
45
46#ifdef	_WCS_LONGLONG
47#define	_WULONG_T	unsigned long long
48#define	_WULONG_MAX	ULLONG_MAX
49#else  /* _WCS_LONGLONG */
50#define	_WULONG_T	unsigned long
51#define	_WULONG_MAX	ULONG_MAX
52#endif /* _WCS_LONGLONG */
53
54#ifdef	_WCS_LONGLONG
55unsigned long long
56wcstoull(const wchar_t *_RESTRICT_KYWD str, wchar_t **_RESTRICT_KYWD ptr,
57    int base)
58#else /* _WCS_LONGLONG */
59unsigned long
60_wcstoul(const wchar_t *str, wchar_t **ptr, int base)
61#endif /* _WCS_LONGLONG */
62{
63	_WULONG_T	val;
64	wchar_t	c;
65	int	xx, neg = 0;
66	_WULONG_T	multmax;
67
68	if (ptr != NULL)
69		*ptr = (wchar_t *)str; /* in case no number is formed */
70	if (base < 0 || base > MBASE) {
71		errno = EINVAL;
72		return (0); /* base is invalid -- should be a fatal error */
73	}
74
75	if (!iswalnum(c = *str)) {
76		while (iswspace(c)) {
77			c = *++str;
78		}
79		switch (c) {
80		case L'-':
81			neg++;
82			/*FALLTHRU*/
83		case L'+':
84			c = *++str;
85		}
86	}
87	if (base == 0) {
88		if (c != L'0')
89			base = 10;
90		else if (str[1] == L'x' || str[1] == L'X')
91			base = 16;
92		else
93			base = 8;
94	}
95	/*
96	 * for any base > 10, the digits incrementally following
97	 *	9 are assumed to be "abc...z" or "ABC...Z"
98	 */
99	if (!iswalnum(c) || (xx = DIGIT(c)) >= base) {
100		errno = EINVAL;
101		return (0); /* no number formed */
102	}
103	if (base == 16 && c == L'0' && iswxdigit(str[2]) &&
104	    (str[1] == L'x' || str[1] == L'X')) {
105		c = *(str += 2); /* skip over leading "0x" or "0X" */
106	}
107
108	multmax = _WULONG_MAX / (_WULONG_T)base;
109	val = DIGIT(c);
110	for (; iswalnum(c = *++str) && (xx = DIGIT(c)) < base; ) {
111		/* accumulate neg avoids surprises near MAXLONG */
112		if (val > multmax)
113			goto overflow;
114		val *= base;
115		if (_WULONG_MAX - val < xx)
116			goto overflow;
117		val += xx;
118	}
119	if (ptr != NULL)
120		*ptr = (wchar_t *)str;
121	return (neg ? -val : val);
122
123overflow:
124	while (iswalnum(c = *++str) && (xx = DIGIT(c)) < base)
125		;
126
127	if (ptr != NULL)
128		*ptr = (wchar_t *)str;
129	errno = ERANGE;
130	return (_WULONG_MAX);
131}
132