106 lines
3.4 KiB
C
106 lines
3.4 KiB
C
/*-
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* Copyright (c) 2002 Tim J. Robbins
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* All rights reserved.
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*
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* 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 AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <stdlib.h>
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#include <wchar.h>
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#include <wctype.h>
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/*
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* Convert a string to a double-precision number.
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*
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* This is the wide-character counterpart of strtod(). So that we do not
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* have to duplicate the code of strtod() here, we convert the supplied
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* wide character string to multibyte and call strtod() on the result.
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* This assumes that the multibyte encoding is compatible with ASCII
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* for at least the digits, radix character and letters.
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*/
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double
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wcstod(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr)
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{
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static const mbstate_t initial;
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mbstate_t state;
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double val;
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char *buf, *end;
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const wchar_t *wcp;
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size_t clen, len;
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while (iswspace(*nptr))
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nptr++;
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/*
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* Convert the supplied numeric wide char. string to multibyte.
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*
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* We could attempt to find the end of the numeric portion of the
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* wide char. string to avoid converting unneeded characters but
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* choose not to bother; optimising the uncommon case where
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* the input string contains a lot of text after the number
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* duplicates a lot of strtod()'s functionality and slows down the
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* most common cases.
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*/
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state = initial;
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wcp = nptr;
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if ((len = wcsrtombs(NULL, &wcp, 0, &state)) == (size_t)-1) {
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if (endptr != NULL)
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*endptr = (wchar_t *)nptr;
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return (0.0);
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}
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if ((buf = malloc(len + 1)) == NULL)
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return (0.0);
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state = initial;
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wcsrtombs(buf, &wcp, len + 1, &state);
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/* Let strtod() do most of the work for us. */
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val = strtod(buf, &end);
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/*
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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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*/
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if (endptr != NULL) {
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#if 1 /* Fast, assume 1:1 WC:MBS mapping. */
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*endptr = (wchar_t *)nptr + (end - buf);
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(void)clen;
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#else /* Slow, conservative approach. */
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state = initial;
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*endptr = (wchar_t *)nptr;
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while (buf < end &&
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(clen = mbrlen(buf, end - buf, &state)) > 0) {
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buf += clen;
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(*endptr)++;
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}
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#endif
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}
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free(buf);
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return (val);
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}
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