locale/wcstod-fbsd.c

   1 /*-
   2  * Copyright (c) 2002 Tim J. Robbins
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD: src/lib/libc/locale/wcstod.c,v 1.4 2004/04/07 09:47:56 tjr Exp $");
  29
  30 #include "xlocale_private.h"
  31
  32 #include <stdlib.h>
  33 #include <wchar.h>
  34 #include <wctype.h>
  35 #include <_simple.h>
  36
  37 /*
  38  * Convert a string to a double-precision number.
  39  *
  40  * This is the wide-character counterpart of strtod(). So that we do not
  41  * have to duplicate the code of strtod() here, we convert the supplied
  42  * wide character string to multibyte and call strtod() on the result.
  43  * This assumes that the multibyte encoding is compatible with ASCII
  44  * for at least the digits, radix character and letters.
  45  */
  46 double
  47 wcstod_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
  48     locale_t loc)
  49 {
  50         static const mbstate_t initial;
  51         mbstate_t mbs;
  52         double val;
  53         char *buf, *end;
  54         size_t len;
  55         locale_t ctype;
  56         _SIMPLE_STRING b;
  57         char mb[MB_CUR_MAX + 1];
  58         const wchar_t *nptr0 = nptr;
  59         const wchar_t *first;
  60
  61         NORMALIZE_LOCALE(loc);
  62         ctype = __numeric_ctype(loc);
  63
  64         while (iswspace_l(*nptr, ctype))
  65                 nptr++;
  66
  67         if ((b = _simple_salloc()) == NULL)
  68                 return (0.0);
  69
  70         first = nptr;
  71         mbs = initial;
  72         while (*nptr && (len = wcrtomb_l(mb, *nptr, &mbs, ctype)) != (size_t)-1) {
  73                 mb[len] = 0;
  74                 if (_simple_sappend(b, mb) < 0) { /* no memory */
  75                         _simple_sfree(b);
  76                         return (0.0);
  77                 }
  78                 nptr++;
  79         }
  80
  81         /* Let strtod() do most of the work for us. */
  82         buf = _simple_string(b);
  83         val = strtod_l(buf, &end, loc);
  84
  85         /*
  86          * We only know where the number ended in the _multibyte_
  87          * representation of the string. If the caller wants to know
  88          * where it ended, count multibyte characters to find the
  89          * corresponding position in the wide char string.
  90          */
  91         if (endptr != NULL)
  92                 /* XXX Assume each wide char is one byte. */
  93                 *endptr = (end == buf) ? (wchar_t *)nptr0 : ((wchar_t *)first + (end - buf));
  94
  95         _simple_sfree(b);
  96
  97         return (val);
  98 }
  99
 100 double
 101 wcstod(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr)
 102 {
 103         return wcstod_l(nptr, endptr, __current_locale());
 104 }