306 lines
9.7 KiB
C
306 lines
9.7 KiB
C
/*
|
|
FUNCTION
|
|
<<wcstod>>, <<wcstof>>, <<wcstold>>, <<wcstod_l>>, <<wcstof_l>>, <<wcstold_l>>---wide char string to double or float
|
|
|
|
INDEX
|
|
wcstod
|
|
|
|
INDEX
|
|
wcstof
|
|
|
|
INDEX
|
|
wcstold
|
|
|
|
INDEX
|
|
wcstod_l
|
|
|
|
INDEX
|
|
wcstof_l
|
|
|
|
INDEX
|
|
wcstold_l
|
|
|
|
INDEX
|
|
_wcstod_r
|
|
|
|
INDEX
|
|
_wcstof_r
|
|
|
|
ANSI_SYNOPSIS
|
|
#include <stdlib.h>
|
|
double wcstod(const wchar_t *__restrict <[str]>,
|
|
wchar_t **__restrict <[tail]>);
|
|
float wcstof(const wchar_t *__restrict <[str]>,
|
|
wchar_t **__restrict <[tail]>);
|
|
long double wcstold(const wchar_t *__restrict <[str]>,
|
|
wchar_t **__restrict <[tail]>);
|
|
|
|
#include <stdlib.h>
|
|
double wcstod_l(const wchar_t *__restrict <[str]>,
|
|
wchar_t **__restrict <[tail]>, locale_t <[locale]>);
|
|
float wcstof_l(const wchar_t *__restrict <[str]>,
|
|
wchar_t **__restrict <[tail]>, locale_t <[locale]>);
|
|
long double wcstold_l(const wchar_t *__restrict <[str]>,
|
|
wchar_t **__restrict <[tail]>,
|
|
locale_t <[locale]>);
|
|
|
|
double _wcstod_r(void *<[reent]>,
|
|
const wchar_t *<[str]>, wchar_t **<[tail]>);
|
|
float _wcstof_r(void *<[reent]>,
|
|
const wchar_t *<[str]>, wchar_t **<[tail]>);
|
|
|
|
TRAD_SYNOPSIS
|
|
#include <stdlib.h>
|
|
double wcstod(<[str]>,<[tail]>)
|
|
wchar_t *__restrict <[str]>;
|
|
wchar_t **__restrict <[tail]>;
|
|
|
|
float wcstof(<[str]>,<[tail]>)
|
|
wchar_t *__restrict <[str]>;
|
|
wchar_t **__restrict <[tail]>;
|
|
|
|
double _wcstod_r(<[reent]>,<[str]>,<[tail]>)
|
|
wchar_t *<[reent]>;
|
|
wchar_t *<[str]>;
|
|
wchar_t **<[tail]>;
|
|
|
|
float _wcstof_r(<[reent]>,<[str]>,<[tail]>)
|
|
wchar_t *<[reent]>;
|
|
wchar_t *<[str]>;
|
|
wchar_t **<[tail]>;
|
|
|
|
DESCRIPTION
|
|
<<wcstod>>, <<wcstof>>, <<wcstold>> parse the wide-character string
|
|
<[str]>, producing a substring which can be converted to a double,
|
|
float, or long double value. The substring converted is the longest
|
|
initial subsequence of <[str]>, beginning with the first non-whitespace
|
|
character, that has one of these formats:
|
|
.[+|-]<[digits]>[.[<[digits]>]][(e|E)[+|-]<[digits]>]
|
|
.[+|-].<[digits]>[(e|E)[+|-]<[digits]>]
|
|
.[+|-](i|I)(n|N)(f|F)[(i|I)(n|N)(i|I)(t|T)(y|Y)]
|
|
.[+|-](n|N)(a|A)(n|N)[<(>[<[hexdigits]>]<)>]
|
|
.[+|-]0(x|X)<[hexdigits]>[.[<[hexdigits]>]][(p|P)[+|-]<[digits]>]
|
|
.[+|-]0(x|X).<[hexdigits]>[(p|P)[+|-]<[digits]>]
|
|
The substring contains no characters if <[str]> is empty, consists
|
|
entirely of whitespace, or if the first non-whitespace
|
|
character is something other than <<+>>, <<->>, <<.>>, or a
|
|
digit, and cannot be parsed as infinity or NaN. If the platform
|
|
does not support NaN, then NaN is treated as an empty substring.
|
|
If the substring is empty, no conversion is done, and
|
|
the value of <[str]> is stored in <<*<[tail]>>>. Otherwise,
|
|
the substring is converted, and a pointer to the final string
|
|
(which will contain at least the terminating null character of
|
|
<[str]>) is stored in <<*<[tail]>>>. If you want no
|
|
assignment to <<*<[tail]>>>, pass a null pointer as <[tail]>.
|
|
|
|
This implementation returns the nearest machine number to the
|
|
input decimal string. Ties are broken by using the IEEE
|
|
round-even rule. However, <<wcstof>> is currently subject to
|
|
double rounding errors.
|
|
|
|
<<wcstod_l>>, <<wcstof_l>>, <<wcstold_l>> are like <<wcstod>>,
|
|
<<wcstof>>, <<wcstold>> but perform 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.
|
|
|
|
The alternate functions <<_wcstod_r>> and <<_wcstof_r>> are
|
|
reentrant versions of <<wcstod>> and <<wcstof>>, respectively.
|
|
The extra argument <[reent]> is a pointer to a reentrancy structure.
|
|
|
|
RETURNS
|
|
Return the converted substring value, if any. If
|
|
no conversion could be performed, 0 is returned. If the
|
|
correct value is out of the range of representable values,
|
|
plus or minus <<HUGE_VAL>> is returned, and <<ERANGE>> is
|
|
stored in errno. If the correct value would cause underflow, 0
|
|
is returned and <<ERANGE>> is stored in errno.
|
|
|
|
PORTABILITY
|
|
<<wcstod>> is ANSI.
|
|
<<wcstof>>, <<wcstold>> are C99.
|
|
<<wcstod_l>>, <<wcstof_l>>, <<wcstold_l>> are GNU extensions.
|
|
|
|
Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
|
|
<<lseek>>, <<read>>, <<sbrk>>, <<write>>.
|
|
*/
|
|
|
|
/*-
|
|
* Copyright (c) 2002 Tim J. Robbins
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <errno.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <wchar.h>
|
|
#include <wctype.h>
|
|
#include <locale.h>
|
|
#include <math.h>
|
|
#include "mprec.h"
|
|
|
|
double
|
|
_wcstod_l (struct _reent *ptr, const wchar_t *nptr, wchar_t **endptr,
|
|
locale_t loc)
|
|
{
|
|
static const mbstate_t initial;
|
|
mbstate_t mbs;
|
|
double val;
|
|
char *buf, *end;
|
|
const wchar_t *wcp;
|
|
size_t len;
|
|
|
|
while (iswspace_l(*nptr, loc))
|
|
nptr++;
|
|
|
|
/*
|
|
* Convert the supplied numeric wide char. string to multibyte.
|
|
*
|
|
* We could attempt to find the end of the numeric portion of the
|
|
* wide char. string to avoid converting unneeded characters but
|
|
* choose not to bother; optimising the uncommon case where
|
|
* the input string contains a lot of text after the number
|
|
* duplicates a lot of strtod()'s functionality and slows down the
|
|
* most common cases.
|
|
*/
|
|
wcp = nptr;
|
|
mbs = initial;
|
|
if ((len = _wcsnrtombs_l(ptr, NULL, &wcp, (size_t) -1, 0, &mbs, loc))
|
|
== (size_t) -1) {
|
|
if (endptr != NULL)
|
|
*endptr = (wchar_t *)nptr;
|
|
return (0.0);
|
|
}
|
|
if ((buf = _malloc_r(ptr, len + 1)) == NULL)
|
|
return (0.0);
|
|
mbs = initial;
|
|
_wcsnrtombs_l(ptr, buf, &wcp, (size_t) -1, len + 1, &mbs, loc);
|
|
|
|
/* Let strtod() do most of the work for us. */
|
|
val = _strtod_l(ptr, buf, &end, loc);
|
|
|
|
/*
|
|
* We only know where the number ended in the _multibyte_
|
|
* representation of the string. If the caller wants to know
|
|
* where it ended, count multibyte characters to find the
|
|
* corresponding position in the wide char string.
|
|
*/
|
|
if (endptr != NULL) {
|
|
/* The only valid multibyte char in a float converted by
|
|
strtod/wcstod is the radix char. What we do here is,
|
|
figure out if the radix char was in the valid leading
|
|
float sequence in the incoming string. If so, the
|
|
multibyte float string is strlen(radix char) - 1 bytes
|
|
longer than the incoming wide char string has characters.
|
|
To fix endptr, reposition end as if the radix char was
|
|
just one byte long. The resulting difference (end - buf)
|
|
is then equivalent to the number of valid wide characters
|
|
in the input string. */
|
|
len = strlen (__localeconv_l (loc)->decimal_point);
|
|
if (len > 1) {
|
|
char *d = strstr (buf,
|
|
__localeconv_l (loc)->decimal_point);
|
|
if (d && d < end)
|
|
end -= len - 1;
|
|
}
|
|
*endptr = (wchar_t *)nptr + (end - buf);
|
|
}
|
|
|
|
_free_r(ptr, buf);
|
|
|
|
return (val);
|
|
}
|
|
|
|
double
|
|
_DEFUN (_wcstod_r, (ptr, nptr, endptr),
|
|
struct _reent *ptr _AND
|
|
_CONST wchar_t *nptr _AND
|
|
wchar_t **endptr)
|
|
{
|
|
return _wcstod_l (ptr, nptr, endptr, __get_current_locale ());
|
|
}
|
|
|
|
float
|
|
_DEFUN (_wcstof_r, (ptr, nptr, endptr),
|
|
struct _reent *ptr _AND
|
|
_CONST wchar_t *nptr _AND
|
|
wchar_t **endptr)
|
|
{
|
|
double retval = _wcstod_l (ptr, nptr, endptr, __get_current_locale ());
|
|
if (isnan (retval))
|
|
return nanf (NULL);
|
|
return (float)retval;
|
|
}
|
|
|
|
#ifndef _REENT_ONLY
|
|
|
|
double
|
|
wcstod_l (const wchar_t *__restrict nptr, wchar_t **__restrict endptr,
|
|
locale_t loc)
|
|
{
|
|
return _wcstod_l (_REENT, nptr, endptr, loc);
|
|
}
|
|
|
|
double
|
|
_DEFUN (wcstod, (nptr, endptr),
|
|
_CONST wchar_t *__restrict nptr _AND wchar_t **__restrict endptr)
|
|
{
|
|
return _wcstod_l (_REENT, nptr, endptr, __get_current_locale ());
|
|
}
|
|
|
|
float
|
|
wcstof_l (const wchar_t *__restrict nptr, wchar_t **__restrict endptr,
|
|
locale_t loc)
|
|
{
|
|
double val = _wcstod_l (_REENT, nptr, endptr, loc);
|
|
if (isnan (val))
|
|
return nanf (NULL);
|
|
float retval = (float) val;
|
|
#ifndef NO_ERRNO
|
|
if (isinf (retval) && !isinf (val))
|
|
_REENT->_errno = ERANGE;
|
|
#endif
|
|
return retval;
|
|
}
|
|
|
|
float
|
|
_DEFUN (wcstof, (nptr, endptr),
|
|
_CONST wchar_t *__restrict nptr _AND
|
|
wchar_t **__restrict endptr)
|
|
{
|
|
double val = _wcstod_l (_REENT, nptr, endptr, __get_current_locale ());
|
|
if (isnan (val))
|
|
return nanf (NULL);
|
|
float retval = (float) val;
|
|
#ifndef NO_ERRNO
|
|
if (isinf (retval) && !isinf (val))
|
|
_REENT->_errno = ERANGE;
|
|
#endif
|
|
|
|
return retval;
|
|
}
|
|
|
|
#endif
|