1 /* $NetBSD: _wcstod.h,v 1.4 2013/05/17 12:55:57 joerg Exp $ */
2
3 /*-
4 * Copyright (c) 2002 Tim J. Robbins
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * aINre met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * Original version ID:
29 * FreeBSD: /repoman/r/ncvs/src/lib/libc/locale/wcstod.c,v 1.4 2004/04/07 09:47:56 tjr Exp
30 * NetBSD: wcstod.c,v 1.8 2006/04/13 01:25:13 tnozaki Exp
31 */
32
33 /*
34 * function template for wcstof, wcstod, wcstold.
35 *
36 * parameters:
37 * _FUNCNAME : function name
38 * _RETURN_TYPE : return type
39 * _STRTOD_FUNC : real conversion function
40 */
41 #ifndef __WCSTOD_H_
42 #define __WCSTOD_H_
43
44 #include <locale.h>
45 #include "setlocale_local.h"
46 #define INT_NAME_(pre, middle, post) pre ## middle ## post
47 #define INT_NAME(pre, middle, post) INT_NAME_(pre, middle, post)
48
49 /*
50 * Convert a string to a double-precision number.
51 *
52 * This is the wide-character counterpart of strto{f,d,ld}(). So that
53 * we do not have to duplicate the code of strto{f,d,ld}() here,
54 * we convert the supplied wide-character string to multibyte and
55 * call strto{f,d,ld}() on the result.
56 * This assumes that the multibyte encoding is compatible with ASCII
57 * for at least the digits, radix character and letters.
58 */
59 static _RETURN_TYPE
INT_NAME(_int_,_FUNCNAME,_l)60 INT_NAME(_int_, _FUNCNAME, _l)(const wchar_t * __restrict nptr,
61 wchar_t ** __restrict endptr, locale_t loc)
62 {
63 const wchar_t *src, *start;
64 _RETURN_TYPE val;
65 char *buf, *end;
66 size_t bufsiz, len;
67
68 _DIAGASSERT(nptr != NULL);
69 /* endptr may be null */
70
71 src = nptr;
72 while (iswspace_l((wint_t)*src, loc) != 0)
73 ++src;
74 if (*src == L'\0')
75 goto no_convert;
76
77 /*
78 * Convert the supplied numeric wide-char. string to multibyte.
79 *
80 * We could attempt to find the end of the numeric portion of the
81 * wide-char. string to avoid converting unneeded characters but
82 * choose not to bother; optimising the uncommon case where
83 * the input string contains a lot of text after the number
84 * duplicates a lot of strto{f,d,ld}()'s functionality and
85 * slows down the most common cases.
86 */
87 start = src;
88 len = wcstombs_l(NULL, src, 0, loc);
89 if (len == (size_t)-1)
90 /* errno = EILSEQ */
91 goto no_convert;
92
93 _DIAGASSERT(len > 0);
94
95 bufsiz = len;
96 buf = (void *)malloc(bufsiz + 1);
97 if (buf == NULL)
98 /* errno = ENOMEM */
99 goto no_convert;
100
101 len = wcstombs_l(buf, src, bufsiz + 1, loc);
102
103 _DIAGASSERT(len == bufsiz);
104 _DIAGASSERT(buf[len] == '\0');
105
106 /* Let strto{f,d,ld}() do most of the work for us. */
107 val = _STRTOD_FUNC(buf, &end, loc);
108 if (buf == end) {
109 free(buf);
110 goto no_convert;
111 }
112
113 /*
114 * We only know where the number ended in the _multibyte_
115 * representation of the string. If the caller wants to know
116 * where it ended, count multibyte characters to find the
117 * corresponding position in the wide-char string.
118 */
119 if (endptr != NULL)
120 /* XXX Assume each wide char is one byte. */
121 *endptr = __UNCONST(start + (size_t)(end - buf));
122
123 free(buf);
124
125 return val;
126
127 no_convert:
128 if (endptr != NULL)
129 *endptr = __UNCONST(nptr);
130 return 0;
131 }
132
133 _RETURN_TYPE
134 INT_NAME(, _FUNCNAME, )(const wchar_t * __restrict nptr,
135 wchar_t ** __restrict endptr)
136 {
137 return INT_NAME(_int_, _FUNCNAME, _l)(nptr, endptr, _current_locale());
138 }
139
140 _RETURN_TYPE
141 INT_NAME(, _FUNCNAME, _l)(const wchar_t * __restrict nptr,
142 wchar_t ** __restrict endptr, locale_t loc)
143 {
144 return INT_NAME(_int_, _FUNCNAME, _l)(nptr, endptr, loc);
145 }
146 #endif /*__WCSTOD_H_*/
147