xref: /freebsd/lib/libc/locale/wcstoull.c (revision c66ec88fed842fbaad62c30d510644ceb7bd2d71)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 1992, 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  * 3. 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 #if 0
39 #if defined(LIBC_SCCS) && !defined(lint)
40 static char sccsid[] = "@(#)strtouq.c	8.1 (Berkeley) 6/4/93";
41 #endif /* LIBC_SCCS and not lint */
42 __FBSDID("FreeBSD: src/lib/libc/stdlib/strtoull.c,v 1.18 2002/09/06 11:23:59 tjr Exp ");
43 #endif
44 __FBSDID("$FreeBSD$");
45 
46 #include <errno.h>
47 #include <limits.h>
48 #include <stdlib.h>
49 #include <wchar.h>
50 #include <wctype.h>
51 #include "xlocale_private.h"
52 
53 /*
54  * Convert a wide character string to an unsigned long long integer.
55  */
56 unsigned long long
57 wcstoull_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
58     int base, locale_t locale)
59 {
60 	const wchar_t *s;
61 	unsigned long long acc;
62 	wchar_t c;
63 	unsigned long long cutoff;
64 	int neg, any, cutlim;
65 	FIX_LOCALE(locale);
66 
67 	/*
68 	 * See strtoull for comments as to the logic used.
69 	 */
70 	s = nptr;
71 	do {
72 		c = *s++;
73 	} while (iswspace_l(c, locale));
74 	if (c == L'-') {
75 		neg = 1;
76 		c = *s++;
77 	} else {
78 		neg = 0;
79 		if (c == L'+')
80 			c = *s++;
81 	}
82 	if ((base == 0 || base == 16) &&
83 	    c == L'0' && (*s == L'x' || *s == L'X')) {
84 		c = s[1];
85 		s += 2;
86 		base = 16;
87 	}
88 	if (base == 0)
89 		base = c == L'0' ? 8 : 10;
90 	acc = any = 0;
91 	if (base < 2 || base > 36)
92 		goto noconv;
93 
94 	cutoff = ULLONG_MAX / base;
95 	cutlim = ULLONG_MAX % 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 >= L'a' && c <= L'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 = ULLONG_MAX;
122 		errno = ERANGE;
123 	} else if (!any) {
124 noconv:
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 }
132 unsigned long long
133 wcstoull(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
134     int base)
135 {
136 	return wcstoull_l(nptr, endptr, base, __get_locale());
137 }
138