1 /* $OpenBSD: _wcstol.h,v 1.3 2015/10/01 02:32:07 guenther Exp $ */
2 /* $NetBSD: _wcstol.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 * @(#)strtol.c 8.1 (Berkeley) 6/4/93
34 * NetBSD: wcstol.c,v 1.1 2001/09/27 16:30:36 yamt Exp
35 * Citrus: xpg4dl/FreeBSD/lib/libc/locale/wcstol.c,v 1.2 2001/09/21 16:11:41 yamt Exp
36 */
37
38 /*
39 * function template for wcstol, wcstoll and wcstoimax.
40 *
41 * parameters:
42 * FUNCNAME : function name
43 * int_type : return type
44 * MIN_VALUE : lower limit of the return type
45 * MAX_VALUE : upper limit of the return type
46 */
47
48 int_type
FUNCNAME(const wchar_t * nptr,wchar_t ** endptr,int base)49 FUNCNAME(const wchar_t *nptr, wchar_t **endptr, int base)
50 {
51 const wchar_t *s;
52 int_type acc, cutoff;
53 wint_t wc;
54 int i;
55 int neg, any, cutlim;
56
57 /* check base value */
58 if (base && (base < 2 || base > 36)) {
59 errno = EINVAL;
60 return 0;
61 }
62
63 /*
64 * Skip white space and pick up leading +/- sign if any.
65 * If base is 0, allow 0x for hex and 0 for octal, else
66 * assume decimal; if base is already 16, allow 0x.
67 */
68 s = nptr;
69 do {
70 wc = (wchar_t) *s++;
71 } while (iswspace(wc));
72 if (wc == L'-') {
73 neg = 1;
74 wc = *s++;
75 } else {
76 neg = 0;
77 if (wc == L'+')
78 wc = *s++;
79 }
80 if ((base == 0 || base == 16) &&
81 wc == L'0' && (*s == L'x' || *s == L'X')) {
82 wc = s[1];
83 s += 2;
84 base = 16;
85 }
86 if (base == 0)
87 base = wc == L'0' ? 8 : 10;
88
89 /*
90 * See strtol for comments as to the logic used.
91 */
92 cutoff = neg ? MIN_VALUE : MAX_VALUE;
93 cutlim = (int)(cutoff % base);
94 cutoff /= base;
95 if (neg) {
96 if (cutlim > 0) {
97 cutlim -= base;
98 cutoff += 1;
99 }
100 cutlim = -cutlim;
101 }
102 for (acc = 0, any = 0;; wc = (wchar_t) *s++) {
103 i = wctoint(wc);
104 if (i == -1)
105 break;
106 if (i >= base)
107 break;
108 if (any < 0)
109 continue;
110 if (neg) {
111 if (acc < cutoff || (acc == cutoff && i > cutlim)) {
112 any = -1;
113 acc = MIN_VALUE;
114 errno = ERANGE;
115 } else {
116 any = 1;
117 acc *= base;
118 acc -= i;
119 }
120 } else {
121 if (acc > cutoff || (acc == cutoff && i > cutlim)) {
122 any = -1;
123 acc = MAX_VALUE;
124 errno = ERANGE;
125 } else {
126 any = 1;
127 acc *= base;
128 acc += i;
129 }
130 }
131 }
132 if (endptr != 0)
133 *endptr = (wchar_t *)(any ? s - 1 : nptr);
134 return (acc);
135 }
136 DEF_STRONG(FUNCNAME);
137