1/* $NetBSD: _wcstoul.h,v 1.5 2013/04/16 16:52:13 joerg Exp $ */
2
3/*
4 * Copyright (c) 1990, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * Original version ID:
32 * @(#)strtoul.c	8.1 (Berkeley) 6/4/93
33 * Citrus: xpg4dl/FreeBSD/lib/libc/locale/wcstoul.c,v 1.2 2001/09/21 16:11:41 yamt Exp
34 * NetBSD: wcstoul.c,v 1.1 2001/09/27 16:30:37 yamt Exp
35 */
36
37/*
38 * function template for wcstoul, wcstoull and wcstoumax.
39 *
40 * parameters:
41 *	_FUNCNAME  : function name
42 *      __UINT     : return type
43 *      __UINT_MAX : upper limit of the return type
44 */
45
46#include <locale.h>
47#include "setlocale_local.h"
48#define INT_FUNCNAME_(pre, name, post)	pre ## name ## post
49#define INT_FUNCNAME(pre, name, post)	INT_FUNCNAME_(pre, name, post)
50
51static __UINT
52INT_FUNCNAME(_int_, _FUNCNAME, _l)(const wchar_t *nptr, wchar_t **endptr,
53				   int base, locale_t loc)
54{
55	const wchar_t *s;
56	__UINT acc, cutoff;
57	wint_t wc;
58	int i;
59	int neg, any, cutlim;
60
61	_DIAGASSERT(nptr != NULL);
62	/* endptr may be NULL */
63
64	if (base && (base < 2 || base > 36)) {
65		errno = EINVAL;
66		return 0;
67	}
68
69	/*
70	 * Skip white space and pick up leading +/- sign if any.
71	 * If base is 0, allow 0x for hex and 0 for octal, else
72	 * assume decimal; if base is already 16, allow 0x.
73	 */
74	s = nptr;
75	do {
76		wc = (wchar_t) *s++;
77	} while (iswspace_l(wc, loc));
78	if (wc == L'-') {
79		neg = 1;
80		wc = *s++;
81	} else {
82		neg = 0;
83		if (wc == L'+')
84			wc = *s++;
85	}
86	if ((base == 0 || base == 16) &&
87	    wc == L'0' && (*s == L'x' || *s == L'X')) {
88		wc = s[1];
89		s += 2;
90		base = 16;
91	}
92	if (base == 0)
93		base = wc == L'0' ? 8 : 10;
94
95	/*
96	 * See strtoul for comments as to the logic used.
97	 */
98	cutoff = __UINT_MAX / (__UINT)base;
99	cutlim = (int)(__UINT_MAX % (__UINT)base);
100	for (acc = 0, any = 0;; wc = (wchar_t) *s++) {
101		i = __wctoint(wc);
102		if (i == (wint_t)-1)
103			break;
104		if (i >= base)
105			break;
106		if (any < 0)
107			continue;
108		if (acc > cutoff || (acc == cutoff && i > cutlim)) {
109			any = -1;
110			acc = __UINT_MAX;
111			errno = ERANGE;
112		} else {
113			any = 1;
114			acc *= (__UINT)base;
115			acc += i;
116		}
117	}
118	if (neg && any > 0)
119		acc = -acc;
120	if (endptr != 0)
121		*endptr = __UNCONST(any ? s - 1 : nptr);
122	return (acc);
123}
124
125__UINT
126_FUNCNAME(const wchar_t *nptr, wchar_t **endptr, int base)
127{
128	return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base,
129						  _current_locale());
130}
131
132__UINT
133INT_FUNCNAME(, _FUNCNAME, _l)(const wchar_t *nptr, wchar_t **endptr,
134			      int base, locale_t loc)
135{
136	return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base, loc);
137}
138