lib/libc/locale/wcstold.c

   1 /*-
   2  * Copyright (c) 2002, 2003 Tim J. Robbins
   3  * All rights reserved.
   4  *
   5  * Copyright (c) 2011 The FreeBSD Foundation
   6  * All rights reserved.
   7  * Portions of this software were developed by David Chisnall
   8  * under sponsorship from the FreeBSD Foundation.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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  * $FreeBSD: head/lib/libc/locale/wcstold.c 227753 2011-11-20 14:45:42Z theraven $
  32  */
  33
  34
  35 #include <stdlib.h>
  36 #include <wchar.h>
  37 #include <wctype.h>
  38 #include "xlocale_private.h"
  39
  40 /*
  41  * See wcstod() for comments as to the logic used.
  42  */
  43 long double
  44 wcstold_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
  45                 locale_t locale)
  46 {
  47         static const mbstate_t initial;
  48         mbstate_t mbs;
  49         long double val;
  50         char *buf, *end;
  51         const wchar_t *wcp = nptr;
  52         size_t len;
  53         size_t spaces = 0;
  54         FIX_LOCALE(locale);
  55
  56         while (iswspace_l(*wcp, locale)) {
  57                 wcp++;
  58                 spaces++;
  59         }
  60
  61         wcp = nptr;
  62         mbs = initial;
  63         if ((len = wcsrtombs_l(NULL, &wcp, 0, &mbs, locale)) == (size_t)-1) {
  64                 if (endptr != NULL)
  65                         *endptr = (wchar_t *)nptr;
  66                 return (0.0);
  67         }
  68         if ((buf = malloc(len + 1)) == NULL)
  69                 return (0.0);
  70         mbs = initial;
  71         wcsrtombs_l(buf, &wcp, len + 1, &mbs, locale);
  72
  73         val = strtold_l(buf, &end, locale);
  74
  75         if (endptr != NULL) {
  76                 /* XXX Assume each wide char is one byte. */
  77                 *endptr = (wchar_t *)nptr + (end - buf);
  78                 if (buf != end)
  79                         *endptr += spaces;
  80         }
  81
  82         free(buf);
  83
  84         return (val);
  85 }
  86 long double
  87 wcstold(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr)
  88 {
  89         return wcstold_l(nptr, endptr, __get_locale());
  90 }