1/* $NetBSD: _wcstol.h,v 1.5 2013/04/16 16:52:13 joerg Exp $ */
2
3/*-
4 * Copyright (c) 1990, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * Original version ID:
32 * @(#)strtol.c	8.1 (Berkeley) 6/4/93
33 * NetBSD: wcstol.c,v 1.1 2001/09/27 16:30:36 yamt Exp
34 * Citrus: xpg4dl/FreeBSD/lib/libc/locale/wcstol.c,v 1.2 2001/09/21 16:11:41 yamt Exp
35 */
36
37/*
38 * function template for wcstol, wcstoll and wcstoimax.
39 *
40 * parameters:
41 *	_FUNCNAME : function name
42 *      __INT     : return type
43 *      __INT_MIN : lower limit of the return type
44 *      __INT_MAX : upper limit of the return type
45 */
46
47#include <locale.h>
48#include "setlocale_local.h"
49#define INT_FUNCNAME_(pre, name, post)	pre ## name ## post
50#define INT_FUNCNAME(pre, name, post)	INT_FUNCNAME_(pre, name, post)
51
52static __INT
53INT_FUNCNAME(_int_, _FUNCNAME, _l)(const wchar_t *nptr, wchar_t **endptr,
54				   int base, locale_t loc)
55{
56	const wchar_t *s;
57	__INT acc, cutoff;
58	wint_t wc;
59	int i;
60	int neg, any, cutlim;
61
62	_DIAGASSERT(nptr != NULL);
63	/* endptr may be NULL */
64
65#ifdef __GNUC__
66	(void)&acc; (void)&cutoff;
67#endif
68
69	/* check base value */
70	if (base && (base < 2 || base > 36)) {
71		errno = EINVAL;
72		return 0;
73	}
74
75	/*
76	 * Skip white space and pick up leading +/- sign if any.
77	 * If base is 0, allow 0x for hex and 0 for octal, else
78	 * assume decimal; if base is already 16, allow 0x.
79	 */
80	s = nptr;
81	do {
82		wc = (wchar_t) *s++;
83	} while (iswspace_l(wc, loc));
84	if (wc == L'-') {
85		neg = 1;
86		wc = *s++;
87	} else {
88		neg = 0;
89		if (wc == L'+')
90			wc = *s++;
91	}
92	if ((base == 0 || base == 16) &&
93	    wc == L'0' && (*s == L'x' || *s == L'X')) {
94		wc = s[1];
95		s += 2;
96		base = 16;
97	}
98	if (base == 0)
99		base = wc == L'0' ? 8 : 10;
100
101	/*
102	 * See strtol for comments as to the logic used.
103	 */
104	cutoff = neg ? __INT_MIN : __INT_MAX;
105	cutlim = (int)(cutoff % base);
106	cutoff /= base;
107	if (neg) {
108		if (cutlim > 0) {
109			cutlim -= base;
110			cutoff += 1;
111		}
112		cutlim = -cutlim;
113	}
114	for (acc = 0, any = 0;; wc = (wchar_t) *s++) {
115		i = __wctoint(wc);
116		if (i == -1)
117			break;
118		if (i >= base)
119			break;
120		if (any < 0)
121			continue;
122		if (neg) {
123			if (acc < cutoff || (acc == cutoff && i > cutlim)) {
124				any = -1;
125				acc = __INT_MIN;
126				errno = ERANGE;
127			} else {
128				any = 1;
129				acc *= base;
130				acc -= i;
131			}
132		} else {
133			if (acc > cutoff || (acc == cutoff && i > cutlim)) {
134				any = -1;
135				acc = __INT_MAX;
136				errno = ERANGE;
137			} else {
138				any = 1;
139				acc *= base;
140				acc += i;
141			}
142		}
143	}
144	if (endptr != 0)
145		*endptr = __UNCONST(any ? s - 1 : nptr);
146	return (acc);
147}
148
149__INT
150_FUNCNAME(const wchar_t *nptr, wchar_t **endptr, int base)
151{
152	return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base,
153						  _current_locale());
154}
155
156__INT
157INT_FUNCNAME(, _FUNCNAME, _l)(const wchar_t *nptr, wchar_t **endptr,
158			      int base, locale_t loc)
159{
160	return INT_FUNCNAME(_int_, _FUNCNAME, _l)(nptr, endptr, base, loc);
161}
162