locale/wcstof-fbsd.c

   1 /*-
   2  * Copyright (c) 2002, 2003 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/wcstof.c,v 1.3 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  * See wcstod() for comments as to the logic used.
  39  */
  40
  41 extern size_t __wcs_end_offset(const char * __restrict buf, const char * __restrict end, locale_t loc);
  42
  43 float
  44 wcstof_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
  45     locale_t loc)
  46 {
  47         static const mbstate_t initial;
  48         mbstate_t mbs;
  49         float val;
  50         char *buf, *end;
  51         size_t len;
  52         locale_t ctype;
  53         _SIMPLE_STRING b;
  54         char mb[MB_CUR_MAX + 1];
  55         const wchar_t *nptr0 = nptr;
  56         const wchar_t *first;
  57
  58         NORMALIZE_LOCALE(loc);
  59         ctype = __numeric_ctype(loc);
  60
  61         while (iswspace_l(*nptr, ctype))
  62                 nptr++;
  63
  64         if ((b = _simple_salloc()) == NULL)
  65                 return (0.0);
  66
  67         first = nptr;
  68         mbs = initial;
  69         while (*nptr && (len = wcrtomb_l(mb, *nptr, &mbs, ctype)) != (size_t)-1) {
  70                 mb[len] = 0;
  71                 if (_simple_sappend(b, mb) < 0) { /* no memory */
  72                         _simple_sfree(b);
  73                         return (0.0);
  74                 }
  75                 nptr++;
  76         }
  77
  78         buf = _simple_string(b);
  79         val = strtof_l(buf, &end, loc);
  80
  81         if (endptr != NULL)
  82                 *endptr = (end == buf) ? (wchar_t *)nptr0 : ((wchar_t *)first + __wcs_end_offset(buf, end, loc));
  83
  84         _simple_sfree(b);
  85
  86         return (val);
  87 }
  88
  89 float
  90 wcstof(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr)
  91 {
  92         return wcstof_l(nptr, endptr, __current_locale());
  93 }