lib/libc/locale/wcstod.c

   1 /* $NetBSD: src/lib/libc/locale/wcstod.c,v 1.4 2001/10/28 12:08:43 yamt Exp $ */
   2 /* $DragonFly: src/lib/libc/locale/wcstod.c,v 1.1 2005/03/16 07:54:41 joerg Exp $ */
   3
   4 /*-
   5  * Copyright (c)1999, 2000, 2001 Citrus Project,
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      $Citrus: xpg4dl/FreeBSD/lib/libc/locale/wcstod.c,v 1.2 2001/09/27 16:23:57 yamt Exp $
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #include <assert.h>
  34 #include <errno.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <wchar.h>
  38 #include <wctype.h>
  39
  40 #define _L(x) __CONCAT(L,x)
  41 #define _LC(x) __CONCAT(L,x)
  42
  43 double
  44 wcstod(const wchar_t *nptr, wchar_t **endptr)
  45 {
  46         const wchar_t *src;
  47         size_t size;
  48         const wchar_t *start;
  49
  50         _DIAGASSERT(nptr);
  51
  52         /*
  53          * we do only check length of string
  54          * and give it over strtod.
  55          */
  56         src = nptr;
  57
  58         /* skip space first */
  59         while (iswspace(*src)) {
  60                 src++;
  61         }
  62
  63         /* get length of string */
  64         start = src;
  65         if (wcschr(_L("+-"), *src))
  66                 src++;
  67         size = wcsspn(src, _L("0123456789"));
  68         src += size;
  69         if (*src == _LC('.')) {/* XXX use localeconv */
  70                 src++;
  71                 size = wcsspn(src, _L("0123456789"));
  72                 src += size;
  73         }
  74         if (wcschr(_L("Ee"), *src)) {
  75                 src++;
  76                 if (wcschr(_L("+-"), *src))
  77                         src++;
  78                 size = wcsspn(src, _L("0123456789"));
  79                 src += size;
  80         }
  81         size = src - start;
  82
  83         /*
  84          * convert to a char-string and pass it to strtod.
  85          *
  86          * since all chars used to represent a double-constant
  87          * are in the portable character set, we can assume
  88          * that they are 1-byte chars.
  89          */
  90         if (size)
  91         {
  92                 mbstate_t st;
  93                 char *buf;
  94                 char *end;
  95                 const wchar_t *s;
  96                 size_t size_converted;
  97                 double result;
  98
  99                 buf = malloc(size + 1);
 100                 if (!buf) {
 101                         /* error */
 102                         errno = ENOMEM; /* XXX */
 103                         return 0;
 104                 }
 105
 106                 s = start;
 107                 memset(&st, 0, sizeof(st));
 108                 size_converted = wcsrtombs(buf, &s, size, &st);
 109                 if (size != size_converted) {
 110                         /* XXX should not happen */
 111                         free(buf);
 112                         errno = EILSEQ;
 113                         return(0);
 114                 }
 115
 116                 buf[size] = 0;
 117                 result = strtod(buf, &end);
 118
 119                 free(buf);
 120
 121                 if (endptr)
 122                         /* LINTED bad interface */
 123                         *endptr = (wchar_t*)start + (end - buf);
 124
 125                 return(result);
 126         }
 127
 128         if (endptr)
 129                 /* LINTED bad interface */
 130                 *endptr = (wchar_t*)start;
 131
 132         return(0);
 133 }