wcstoimax.c revision 331722 
1/*-
2 * Copyright (c) 1992, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Copyright (c) 2011 The FreeBSD Foundation
6 * All rights reserved.
7 * Portions of this software were developed by David Chisnall
8 * under sponsorship from the FreeBSD Foundation.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 4. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36#if 0
37#if defined(LIBC_SCCS) && !defined(lint)
38static char sccsid[] = "from @(#)strtol.c	8.1 (Berkeley) 6/4/93";
39#endif /* LIBC_SCCS and not lint */
40__FBSDID("FreeBSD: src/lib/libc/stdlib/strtoimax.c,v 1.8 2002/09/06 11:23:59 tjr Exp ");
41#endif
42__FBSDID("$FreeBSD: stable/11/lib/libc/locale/wcstoimax.c 331722 2018-03-29 02:50:57Z eadler $");
43
44#include <errno.h>
45#include <inttypes.h>
46#include <stdlib.h>
47#include <wchar.h>
48#include <wctype.h>
49#include "xlocale_private.h"
50
51/*
52 * Convert a wide character string to an intmax_t integer.
53 */
54intmax_t
55wcstoimax_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
56    int base, locale_t locale)
57{
58	const wchar_t *s;
59	uintmax_t acc;
60	wchar_t c;
61	uintmax_t cutoff;
62	int neg, any, cutlim;
63	FIX_LOCALE(locale);
64
65	/*
66	 * See strtoimax for comments as to the logic used.
67	 */
68	s = nptr;
69	do {
70		c = *s++;
71	} while (iswspace_l(c, locale));
72	if (c == L'-') {
73		neg = 1;
74		c = *s++;
75	} else {
76		neg = 0;
77		if (c == L'+')
78			c = *s++;
79	}
80	if ((base == 0 || base == 16) &&
81	    c == L'0' && (*s == L'x' || *s == L'X')) {
82		c = s[1];
83		s += 2;
84		base = 16;
85	}
86	if (base == 0)
87		base = c == L'0' ? 8 : 10;
88	acc = any = 0;
89	if (base < 2 || base > 36)
90		goto noconv;
91
92	cutoff = neg ? (uintmax_t)-(INTMAX_MIN + INTMAX_MAX) + INTMAX_MAX
93	    : INTMAX_MAX;
94	cutlim = cutoff % base;
95	cutoff /= base;
96	for ( ; ; c = *s++) {
97#ifdef notyet
98		if (iswdigit_l(c, locale))
99			c = digittoint_l(c, locale);
100		else
101#endif
102		if (c >= L'0' && c <= L'9')
103			c -= L'0';
104		else if (c >= L'A' && c <= L'Z')
105			c -= L'A' - 10;
106		else if (c >= 'a' && c <= 'z')
107			c -= L'a' - 10;
108		else
109			break;
110		if (c >= base)
111			break;
112		if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
113			any = -1;
114		else {
115			any = 1;
116			acc *= base;
117			acc += c;
118		}
119	}
120	if (any < 0) {
121		acc = neg ? INTMAX_MIN : INTMAX_MAX;
122		errno = ERANGE;
123	} else if (!any) {
124noconv:
125		errno = EINVAL;
126	} else if (neg)
127		acc = -acc;
128	if (endptr != NULL)
129		*endptr = (wchar_t *)(any ? s - 1 : nptr);
130	return (acc);
131}
132intmax_t
133wcstoimax(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
134    int base)
135{
136	return wcstoimax_l(nptr, endptr, base, __get_locale());
137}
138