wcstoull.c revision 103793 
1/*-
2 * Copyright (c) 1992, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <sys/cdefs.h>
35#if 0
36#if defined(LIBC_SCCS) && !defined(lint)
37static char sccsid[] = "@(#)strtouq.c	8.1 (Berkeley) 6/4/93";
38#endif /* LIBC_SCCS and not lint */
39__FBSDID("FreeBSD: src/lib/libc/stdlib/strtoull.c,v 1.18 2002/09/06 11:23:59 tjr Exp ");
40#endif
41__FBSDID("$FreeBSD: head/lib/libc/locale/wcstoull.c 103793 2002-09-22 08:06:45Z tjr $");
42
43#include <errno.h>
44#include <limits.h>
45#include <stdlib.h>
46#include <wchar.h>
47#include <wctype.h>
48
49/*
50 * Convert a wide character string to an unsigned long long integer.
51 */
52unsigned long long
53wcstoull(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
54    int base)
55{
56	const wchar_t *s;
57	unsigned long long acc;
58	wchar_t c;
59	unsigned long long cutoff;
60	int neg, any, cutlim;
61
62	/*
63	 * See strtoull for comments as to the logic used.
64	 */
65	s = nptr;
66	do {
67		c = *s++;
68	} while (iswspace(c));
69	if (c == L'-') {
70		neg = 1;
71		c = *s++;
72	} else {
73		neg = 0;
74		if (c == L'+')
75			c = *s++;
76	}
77	if ((base == 0 || base == 16) &&
78	    c == L'0' && (*s == L'x' || *s == L'X')) {
79		c = s[1];
80		s += 2;
81		base = 16;
82	}
83	if (base == 0)
84		base = c == L'0' ? 8 : 10;
85	acc = any = 0;
86	if (base < 2 || base > 36)
87		goto noconv;
88
89	cutoff = ULLONG_MAX / base;
90	cutlim = ULLONG_MAX % base;
91	for ( ; ; c = *s++) {
92#ifdef notyet
93		if (iswdigit(c))
94			c = digittoint(c);
95		else
96#endif
97		if (c >= L'0' && c <= L'9')
98			c -= L'0';
99		else if (c >= L'A' && c <= L'Z')
100			c -= L'A' - 10;
101		else if (c >= L'a' && c <= L'z')
102			c -= L'a' - 10;
103		else
104			break;
105		if (c >= base)
106			break;
107		if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
108			any = -1;
109		else {
110			any = 1;
111			acc *= base;
112			acc += c;
113		}
114	}
115	if (any < 0) {
116		acc = ULLONG_MAX;
117		errno = ERANGE;
118	} else if (!any) {
119noconv:
120		errno = EINVAL;
121	} else if (neg)
122		acc = -acc;
123	if (endptr != NULL)
124		*endptr = (wchar_t *)(any ? s - 1 : nptr);
125	return (acc);
126}
127