Retro68/gcc/newlib/libc/stdlib/wcstol.c

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/*
FUNCTION
<<wcstol>>, <<wcstol_l>>---wide string to long
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INDEX
wcstol
INDEX
wcstol_l
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INDEX
_wcstol_r
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SYNOPSIS
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#include <wchar.h>
long wcstol(const wchar_t *__restrict <[s]>,
wchar_t **__restrict <[ptr]>, int <[base]>);
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#include <wchar.h>
long wcstol_l(const wchar_t *__restrict <[s]>,
wchar_t **__restrict <[ptr]>, int <[base]>,
locale_t <[locale]>);
long _wcstol_r(void *<[reent]>, const wchar_t *<[s]>,
wchar_t **<[ptr]>, int <[base]>);
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DESCRIPTION
The function <<wcstol>> converts the wide string <<*<[s]>>> to
a <<long>>. First, it breaks down the string into three parts:
leading whitespace, which is ignored; a subject string consisting
of characters resembling an integer in the radix specified by <[base]>;
and a trailing portion consisting of zero or more unparseable characters,
and always including the terminating null character. Then, it attempts
to convert the subject string into a <<long>> and returns the
result.
If the value of <[base]> is 0, the subject string is expected to look
like a normal C integer constant: an optional sign, a possible `<<0x>>'
indicating a hexadecimal base, and a number. If <[base]> is between
2 and 36, the expected form of the subject is a sequence of letters
and digits representing an integer in the radix specified by <[base]>,
with an optional plus or minus sign. The letters <<a>>--<<z>> (or,
equivalently, <<A>>--<<Z>>) are used to signify values from 10 to 35;
only letters whose ascribed values are less than <[base]> are
permitted. If <[base]> is 16, a leading <<0x>> is permitted.
The subject sequence is the longest initial sequence of the input
string that has the expected form, starting with the first
non-whitespace character. If the string is empty or consists entirely
of whitespace, or if the first non-whitespace character is not a
permissible letter or digit, the subject string is empty.
If the subject string is acceptable, and the value of <[base]> is zero,
<<wcstol>> attempts to determine the radix from the input string. A
string with a leading <<0x>> is treated as a hexadecimal value; a string with
a leading 0 and no <<x>> is treated as octal; all other strings are
treated as decimal. If <[base]> is between 2 and 36, it is used as the
conversion radix, as described above. If the subject string begins with
a minus sign, the value is negated. Finally, a pointer to the first
character past the converted subject string is stored in <[ptr]>, if
<[ptr]> is not <<NULL>>.
If the subject string is empty (or not in acceptable form), no conversion
is performed and the value of <[s]> is stored in <[ptr]> (if <[ptr]> is
not <<NULL>>).
The alternate function <<_wcstol_r>> is a reentrant version. The
extra argument <[reent]> is a pointer to a reentrancy structure.
<<wcstol_l>> is like <<wcstol>> but performs the conversion based on the
locale specified by the locale object locale. If <[locale]> is
LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.
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RETURNS
<<wcstol>>, <<wcstol_l>> return the converted value, if any. If no
conversion was made, 0 is returned.
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<<wcstol>>, <<wcstol_l>> return <<LONG_MAX>> or <<LONG_MIN>> if the
magnitude of the converted value is too large, and sets <<errno>>
to <<ERANGE>>.
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PORTABILITY
<<wcstol>> is ANSI.
<<wcstol_l>> is a GNU extension.
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No supporting OS subroutines are required.
*/
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <_ansi.h>
#include <limits.h>
#include <wctype.h>
#include <errno.h>
#include <wchar.h>
#include <reent.h>
#include "../locale/setlocale.h"
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/*
* Convert a wide string to a long integer.
*/
static long
_wcstol_l (struct _reent *rptr, const wchar_t *nptr, wchar_t **endptr,
int base, locale_t loc)
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{
register const wchar_t *s = nptr;
register unsigned long acc;
register int c;
register unsigned long cutoff;
register int neg = 0, any, cutlim;
/*
* Skip white space and pick up leading +/- sign if any.
* If base is 0, allow 0x for hex and 0 for octal, else
* assume decimal; if base is already 16, allow 0x.
*/
do {
c = *s++;
} while (iswspace_l(c, loc));
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if (c == L'-') {
neg = 1;
c = *s++;
} else if (c == L'+')
c = *s++;
if ((base == 0 || base == 16) &&
c == L'0' && (*s == L'x' || *s == L'X')) {
c = s[1];
s += 2;
base = 16;
}
if (base == 0)
base = c == L'0' ? 8 : 10;
/*
* Compute the cutoff value between legal numbers and illegal
* numbers. That is the largest legal value, divided by the
* base. An input number that is greater than this value, if
* followed by a legal input character, is too big. One that
* is equal to this value may be valid or not; the limit
* between valid and invalid numbers is then based on the last
* digit. For instance, if the range for longs is
* [-2147483648..2147483647] and the input base is 10,
* cutoff will be set to 214748364 and cutlim to either
* 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
* a value > 214748364, or equal but the next digit is > 7 (or 8),
* the number is too big, and we will return a range error.
*
* Set any if any `digits' consumed; make it negative to indicate
* overflow.
*/
cutoff = neg ? -(unsigned long)LONG_MIN : LONG_MAX;
cutlim = cutoff % (unsigned long)base;
cutoff /= (unsigned long)base;
for (acc = 0, any = 0;; c = *s++) {
if (c >= L'0' && c <= L'9')
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c -= L'0';
else if (c >= L'A' && c <= L'Z')
c -= L'A' - 10;
else if (c >= L'a' && c <= L'z')
c -= L'a' - 10;
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else
break;
if (c >= base)
break;
if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
any = -1;
else {
any = 1;
acc *= base;
acc += c;
}
}
if (any < 0) {
acc = neg ? LONG_MIN : LONG_MAX;
rptr->_errno = ERANGE;
} else if (neg)
acc = -acc;
if (endptr != 0)
*endptr = (wchar_t *) (any ? s - 1 : nptr);
return (acc);
}
long
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_wcstol_r (struct _reent *rptr,
const wchar_t *nptr,
wchar_t **endptr,
int base)
{
return _wcstol_l (rptr, nptr, endptr, base, __get_current_locale ());
}
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#ifndef _REENT_ONLY
long
wcstol_l (const wchar_t *__restrict s, wchar_t **__restrict ptr, int base,
locale_t loc)
{
return _wcstol_l (_REENT, s, ptr, base, loc);
}
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long
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wcstol (const wchar_t *__restrict s,
wchar_t **__restrict ptr,
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int base)
{
return _wcstol_l (_REENT, s, ptr, base, __get_current_locale ());
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}
#endif