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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 <string.h>
33 #include <stdlib.h>
34 #include <wchar.h>
35 #include <wctype.h>
36 #include <_simple.h>
37
38 /*
39 * __wcs_end_offset calculates the offset to the end within the wide character
40 * string, assuming numbers and letters are single bytes in multibyte
41 * representation, get the actual decimal string for localeconv_l. If the
42 * decimal point was within the string, compensate for the fact that the
43 * (possible more than one byte) decimal point one takes one wide character.
44 */
45 __private_extern__ size_t
46 __wcs_end_offset(const char * __restrict buf, const char * __restrict end, locale_t loc)
47 {
48 const char *decimalpoint = localeconv_l(loc)->decimal_point;
49 size_t n = end - buf;
50 char *p;
51
52 if ((p = strnstr(buf, decimalpoint, n)) != NULL)
53 n -= strlen(decimalpoint) - 1;
54 return n;
55 }
56
57 /*
58 * Convert a string to a double-precision number.
59 *
60 * This is the wide-character counterpart of strtod(). So that we do not
61 * have to duplicate the code of strtod() here, we convert the supplied
62 * wide character string to multibyte and call strtod() on the result.
63 * This assumes that the multibyte encoding is compatible with ASCII
64 * for at least the digits and letters. The radix character can be more
65 * than one byte.
66 */
67
68 double
69 wcstod_l(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr,
70 locale_t loc)
71 {
72 static const mbstate_t initial;
73 mbstate_t mbs;
74 double val;
75 char *buf, *end;
76 size_t len;
77 locale_t ctype;
78 _SIMPLE_STRING b;
79 char mb[MB_CUR_MAX + 1];
80 const wchar_t *nptr0 = nptr;
81 const wchar_t *first;
82
83 NORMALIZE_LOCALE(loc);
84 ctype = __numeric_ctype(loc);
85
86 while (iswspace_l(*nptr, ctype))
87 nptr++;
88
89 if ((b = _simple_salloc()) == NULL)
90 return (0.0);
91
92 first = nptr;
93 mbs = initial;
94 while (*nptr && (len = wcrtomb_l(mb, *nptr, &mbs, ctype)) != (size_t)-1) {
95 mb[len] = 0;
96 if (_simple_sappend(b, mb) < 0) { /* no memory */
97 _simple_sfree(b);
98 return (0.0);
99 }
100 nptr++;
101 }
102
103 /* Let strtod() do most of the work for us. */
104 buf = _simple_string(b);
105 val = strtod_l(buf, &end, loc);
106
107 /*
108 * We only know where the number ended in the _multibyte_
109 * representation of the string. If the caller wants to know
110 * where it ended, count multibyte characters to find the
111 * corresponding position in the wide char string.
112 */
113 if (endptr != NULL)
114 /* XXX Assume each wide char is one byte. */
115 *endptr = (end == buf) ? (wchar_t *)nptr0 : ((wchar_t *)first + __wcs_end_offset(buf, end, loc));
116
117 _simple_sfree(b);
118
119 return (val);
120 }
121
122 double
123 wcstod(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr)
124 {
125 return wcstod_l(nptr, endptr, __current_locale());
126 }