1/*	$OpenBSD: _wcstoul.h,v 1.3 2015/10/01 02:32:07 guenther Exp $	*/
2/* $NetBSD: _wcstoul.h,v 1.2 2003/08/07 16:43:03 agc Exp $ */
3
4/*
5 * Copyright (c) 1990, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * Original version ID:
33 * @(#)strtoul.c	8.1 (Berkeley) 6/4/93
34 * Citrus: xpg4dl/FreeBSD/lib/libc/locale/wcstoul.c,v 1.2 2001/09/21 16:11:41 yamt Exp
35 * NetBSD: wcstoul.c,v 1.1 2001/09/27 16:30:37 yamt Exp
36 */
37
38/*
39 * function template for wcstoul, wcstoull and wcstoumax.
40 *
41 * parameters:
42 *	FUNCNAME  : function name
43 *      uint_type : return type
44 *      MAX_VALUE : upper limit of the return type
45 */
46
47uint_type
48FUNCNAME(const wchar_t *nptr, wchar_t **endptr, int base)
49{
50	const wchar_t *s;
51	uint_type acc, cutoff;
52	wint_t wc;
53	int i;
54	int neg, any, cutlim;
55
56	if (base && (base < 2 || base > 36)) {
57		errno = EINVAL;
58		return 0;
59	}
60
61	/*
62	 * Skip white space and pick up leading +/- sign if any.
63	 * If base is 0, allow 0x for hex and 0 for octal, else
64	 * assume decimal; if base is already 16, allow 0x.
65	 */
66	s = nptr;
67	do {
68		wc = (wchar_t) *s++;
69	} while (iswspace(wc));
70	if (wc == L'-') {
71		neg = 1;
72		wc = *s++;
73	} else {
74		neg = 0;
75		if (wc == L'+')
76			wc = *s++;
77	}
78	if ((base == 0 || base == 16) &&
79	    wc == L'0' && (*s == L'x' || *s == L'X')) {
80		wc = s[1];
81		s += 2;
82		base = 16;
83	}
84	if (base == 0)
85		base = wc == L'0' ? 8 : 10;
86
87	/*
88	 * See strtoul for comments as to the logic used.
89	 */
90	cutoff = MAX_VALUE / (uint_type)base;
91	cutlim = (int)(MAX_VALUE % (uint_type)base);
92	for (acc = 0, any = 0;; wc = (wchar_t) *s++) {
93		i = wctoint(wc);
94		if (i == (wint_t)-1)
95			break;
96		if (i >= base)
97			break;
98		if (any < 0)
99			continue;
100		if (acc > cutoff || (acc == cutoff && i > cutlim)) {
101			any = -1;
102			acc = MAX_VALUE;
103			errno = ERANGE;
104		} else {
105			any = 1;
106			acc *= (uint_type)base;
107			acc += i;
108		}
109	}
110	if (neg && any > 0)
111		acc = -acc;
112	if (endptr != 0)
113		*endptr = (wchar_t *)(any ? s - 1 : nptr);
114	return (acc);
115}
116DEF_STRONG(FUNCNAME);
117