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
47 uint_type
FUNCNAME(const wchar_t * nptr,wchar_t ** endptr,int base)48 FUNCNAME(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 }
116 DEF_STRONG(FUNCNAME);
117