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 _wcstol = wcstol
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	_WLONG_T	long long
46#define	_WLONG_MAX	LLONG_MAX
47#define	_WLONG_MIN	LLONG_MIN
48#else  /* _WCS_LONGLONG */
49#define	_WLONG_T	long
50#define	_WLONG_MAX	LONG_MAX
51#define	_WLONG_MIN	LONG_MIN
52#endif /* _WCS_LONGLONG */
53
54#ifdef	_WCS_LONGLONG
55long long
56wcstoll(const wchar_t *_RESTRICT_KYWD str, wchar_t **_RESTRICT_KYWD ptr,
57    int base)
58#else  /* _WCS_LONGLONG */
59long
60wcstol(const wchar_t *str, wchar_t **ptr, int base)
61#endif /* _WCS_LONGLONG */
62{
63	_WLONG_T	val;
64	wchar_t	c;
65	int	xx, neg = 0;
66	_WLONG_T	multmin, limit;
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
104	if (base == 16 && c == L'0' && iswxdigit(str[2]) &&
105	    (str[1] == L'x' || str[1] == L'X')) {
106		c = *(str += 2); /* skip over leading "0x" or "0X" */
107	}
108
109	if (neg) {
110		limit = _WLONG_MIN;
111	} else {
112		limit = -_WLONG_MAX;
113	}
114	multmin = limit / base;
115
116	val = -DIGIT(c);
117	for (; iswalnum(c = *++str) && (xx = DIGIT(c)) < base; ) {
118		/* accumulate neg avoids surprises near MAXLONG */
119		if (val < multmin)
120			goto overflow;
121		val *= base;
122		if (val < limit + xx)
123			goto overflow;
124		val -= xx;
125	}
126	if (ptr != NULL)
127		*ptr = (wchar_t *)str;
128	return (neg ? val : -val);
129
130overflow:
131	while (iswalnum(c = *++str) && (xx = DIGIT(c)) < base)
132		;
133
134	if (ptr != NULL)
135		*ptr = (wchar_t *)str;
136	errno = ERANGE;
137	return (neg ? _WLONG_MIN : _WLONG_MAX);
138}
139