109 lines
3.5 KiB
C
109 lines
3.5 KiB
C
/*
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(C) Copyright IBM Corp. 2009
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of IBM nor the names of its contributors may be
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used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <wchar.h>
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#include <wctype.h>
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#include <locale.h>
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#include "local.h"
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long double
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wcstold (const wchar_t *__restrict nptr, wchar_t **__restrict endptr)
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{
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#ifdef _LDBL_EQ_DBL
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/* On platforms where long double is as wide as double. */
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return wcstod(nptr, endptr);
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#else /* This is a duplicate of the code in wcstod.c, but converted to long double. */
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static const mbstate_t initial;
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mbstate_t mbs;
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long double val;
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char *buf, *end;
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const wchar_t *wcp;
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size_t len;
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while (iswspace (*nptr))
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nptr++;
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/* Convert the supplied numeric wide char string to multibyte. */
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wcp = nptr;
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mbs = initial;
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if ((len = wcsrtombs (NULL, &wcp, 0, &mbs)) == (size_t)-1)
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{
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if (endptr != NULL)
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*endptr = (wchar_t *) nptr;
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return 0.0L;
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}
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if ((buf = malloc (len + 1)) == NULL)
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return 0.0L;
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mbs = initial;
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wcsrtombs (buf, &wcp, len + 1, &mbs);
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val = strtold (buf, &end);
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/* We only know where the number ended in the _multibyte_
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representation of the string. If the caller wants to know
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where it ended, count multibyte characters to find the
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corresponding position in the wide char string. */
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if (endptr != NULL)
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{
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/* The only valid multibyte char in a float converted by
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strtold/wcstold is the radix char. What we do here is,
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figure out if the radix char was in the valid leading
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float sequence in the incoming string. If so, the
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multibyte float string is strlen (radix char) - 1 bytes
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longer than the incoming wide char string has characters.
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To fix endptr, reposition end as if the radix char was
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just one byte long. The resulting difference (end - buf)
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is then equivalent to the number of valid wide characters
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in the input string. */
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len = strlen (localeconv ()->decimal_point);
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if (len > 1)
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{
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char *d = strstr (buf, localeconv ()->decimal_point);
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if (d && d < end)
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end -= len - 1;
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}
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*endptr = (wchar_t *) nptr + (end - buf);
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}
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free (buf);
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return val;
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#endif /* _LDBL_EQ_DBL */
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}
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