wcstol.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1990, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Copyright (c) 2011 The FreeBSD Foundation
8 * All rights reserved.
9 * Portions of this software were developed by David Chisnall
10 * under sponsorship from the FreeBSD Foundation.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: stable/11/lib/libc/locale/wcstol.c 330897 2018-03-14 03:19:51Z eadler $");
39
40#include <ctype.h>
41#include <errno.h>
42#include <limits.h>
43#include <wchar.h>
44#include <wctype.h>
45#include "xlocale_private.h"
46
47/*
48 * Convert a string to a long integer.
49 */
50long
51wcstol_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr, int
52		base, locale_t locale)
53{
54	const wchar_t *s;
55	unsigned long acc;
56	wchar_t c;
57	unsigned long cutoff;
58	int neg, any, cutlim;
59	FIX_LOCALE(locale);
60
61	/*
62	 * See strtol for comments as to the logic used.
63	 */
64	s = nptr;
65	do {
66		c = *s++;
67	} while (iswspace_l(c, locale));
68	if (c == '-') {
69		neg = 1;
70		c = *s++;
71	} else {
72		neg = 0;
73		if (c == L'+')
74			c = *s++;
75	}
76	if ((base == 0 || base == 16) &&
77	    c == L'0' && (*s == L'x' || *s == L'X')) {
78		c = s[1];
79		s += 2;
80		base = 16;
81	}
82	if (base == 0)
83		base = c == L'0' ? 8 : 10;
84	acc = any = 0;
85	if (base < 2 || base > 36)
86		goto noconv;
87
88	cutoff = neg ? (unsigned long)-(LONG_MIN + LONG_MAX) + LONG_MAX
89	    : LONG_MAX;
90	cutlim = cutoff % base;
91	cutoff /= base;
92	for ( ; ; c = *s++) {
93#ifdef notyet
94		if (iswdigit_l(c, locale))
95			c = digittoint_l(c, locale);
96		else
97#endif
98		if (c >= L'0' && c <= L'9')
99			c -= L'0';
100		else if (c >= L'A' && c <= L'Z')
101			c -= L'A' - 10;
102		else if (c >= L'a' && c <= L'z')
103			c -= L'a' - 10;
104		else
105			break;
106		if (c >= base)
107			break;
108		if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
109			any = -1;
110		else {
111			any = 1;
112			acc *= base;
113			acc += c;
114		}
115	}
116	if (any < 0) {
117		acc = neg ? LONG_MIN : LONG_MAX;
118		errno = ERANGE;
119	} else if (!any) {
120noconv:
121		errno = EINVAL;
122	} else if (neg)
123		acc = -acc;
124	if (endptr != NULL)
125		*endptr = (wchar_t *)(any ? s - 1 : nptr);
126	return (acc);
127}
128long
129wcstol(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr, int base)
130{
131	return wcstol_l(nptr, endptr, base, __get_locale());
132}
133