1/* $NetBSD: _wcstoul.h,v 1.2 2003/08/07 16:43:03 agc 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__UINT
47_FUNCNAME(nptr, endptr, base)
48	const wchar_t *nptr;
49	wchar_t **endptr;
50	int base;
51{
52	const wchar_t *s;
53	__UINT acc, cutoff;
54	wint_t wc;
55	int i;
56	int neg, any, cutlim;
57
58	_DIAGASSERT(nptr != NULL);
59	/* endptr may be NULL */
60
61	if (base && (base < 2 || base > 36)) {
62		errno = EINVAL;
63		return 0;
64	}
65
66	/*
67	 * Skip white space and pick up leading +/- sign if any.
68	 * If base is 0, allow 0x for hex and 0 for octal, else
69	 * assume decimal; if base is already 16, allow 0x.
70	 */
71	s = nptr;
72	do {
73		wc = (wchar_t) *s++;
74	} while (iswspace(wc));
75	if (wc == L'-') {
76		neg = 1;
77		wc = *s++;
78	} else {
79		neg = 0;
80		if (wc == L'+')
81			wc = *s++;
82	}
83	if ((base == 0 || base == 16) &&
84	    wc == L'0' && (*s == L'x' || *s == L'X')) {
85		wc = s[1];
86		s += 2;
87		base = 16;
88	}
89	if (base == 0)
90		base = wc == L'0' ? 8 : 10;
91
92	/*
93	 * See strtoul for comments as to the logic used.
94	 */
95	cutoff = __UINT_MAX / (__UINT)base;
96	cutlim = (int)(__UINT_MAX % (__UINT)base);
97	for (acc = 0, any = 0;; wc = (wchar_t) *s++) {
98		i = __wctoint(wc);
99		if (i == (wint_t)-1)
100			break;
101		if (i >= base)
102			break;
103		if (any < 0)
104			continue;
105		if (acc > cutoff || (acc == cutoff && i > cutlim)) {
106			any = -1;
107			acc = __UINT_MAX;
108			errno = ERANGE;
109		} else {
110			any = 1;
111			acc *= (__UINT)base;
112			acc += i;
113		}
114	}
115	if (neg && any > 0)
116		acc = -acc;
117	if (endptr != 0)
118		*endptr = __UNCONST(any ? s - 1 : nptr);
119	return (acc);
120}
121