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2aa62f2b 1/* $NetBSD: _wcstod.h,v 1.1 2006/04/15 12:17:23 tnozaki Exp $ */\r
2\r
3/*-\r
4 * Copyright (c) 2002 Tim J. Robbins\r
5 * All rights reserved.\r
6 *\r
7 * Redistribution and use in source and binary forms, with or without\r
8 * modification, are permitted provided that the following conditions\r
9 * are met:\r
10 * 1. Redistributions of source code must retain the above copyright\r
11 * notice, this list of conditions and the following disclaimer.\r
12 * 2. Redistributions in binary form must reproduce the above copyright\r
13 * notice, this list of conditions and the following disclaimer in the\r
14 * documentation and/or other materials provided with the distribution.\r
15 *\r
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND\r
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\r
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE\r
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\r
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\r
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\r
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT\r
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\r
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\r
26 * SUCH DAMAGE.\r
27 *\r
28 * Original version ID:\r
29 * FreeBSD: /repoman/r/ncvs/src/lib/libc/locale/wcstod.c,v 1.4 2004/04/07 09:47:56 tjr Exp\r
30 * NetBSD: wcstod.c,v 1.8 2006/04/13 01:25:13 tnozaki Exp\r
31 */\r
32\r
33/*\r
34 * function template for wcstof, wcstod, wcstold.\r
35 *\r
36 * parameters:\r
05c7d5f6 37 * _FUNCNAME : function name\r
38 * _RETURN_TYPE : return type\r
39 * _STRTOD_FUNC : real conversion function\r
2aa62f2b 40 */\r
41#ifndef __WCSTOD_H_\r
42#define __WCSTOD_H_\r
43\r
44/*\r
45 * Convert a string to a double-precision number.\r
46 *\r
47 * This is the wide-character counterpart of strto{f,d,ld}(). So that\r
48 * we do not have to duplicate the code of strto{f,d,ld}() here,\r
49 * we convert the supplied wide character string to multibyte and\r
50 * call strto{f,d,ld}() on the result.\r
51 * This assumes that the multibyte encoding is compatible with ASCII\r
52 * for at least the digits, radix character and letters.\r
53 */\r
54_RETURN_TYPE\r
55_FUNCNAME(const wchar_t * __restrict nptr, wchar_t ** __restrict endptr)\r
56{\r
05c7d5f6 57 const wchar_t *src, *start;\r
58 _RETURN_TYPE val;\r
59 char *buf, *end;\r
60 size_t bufsiz, len;\r
2aa62f2b 61\r
05c7d5f6 62 _DIAGASSERT(nptr != NULL);\r
63 /* endptr may be null */\r
2aa62f2b 64\r
05c7d5f6 65 src = nptr;\r
66 while (iswspace((wint_t)*src) != 0)\r
67 ++src;\r
68 if (*src == L'\0')\r
69 goto no_convert;\r
2aa62f2b 70\r
05c7d5f6 71 /*\r
72 * Convert the supplied numeric wide char. string to multibyte.\r
73 *\r
74 * We could attempt to find the end of the numeric portion of the\r
75 * wide char. string to avoid converting unneeded characters but\r
76 * choose not to bother; optimising the uncommon case where\r
77 * the input string contains a lot of text after the number\r
78 * duplicates a lot of strto{f,d,ld}()'s functionality and\r
79 * slows down the most common cases.\r
80 */\r
81 start = src;\r
82 len = wcstombs(NULL, src, 0);\r
83 if (len == (size_t)-1)\r
84 /* errno = EILSEQ */\r
85 goto no_convert;\r
2aa62f2b 86\r
05c7d5f6 87 _DIAGASSERT(len > 0);\r
2aa62f2b 88\r
05c7d5f6 89 bufsiz = len;\r
90 buf = (void *)malloc(bufsiz + 1);\r
91 if (buf == NULL)\r
92 /* errno = ENOMEM */\r
93 goto no_convert;\r
2aa62f2b 94\r
05c7d5f6 95 len = wcstombs(buf, src, bufsiz + 1);\r
2aa62f2b 96\r
05c7d5f6 97 _DIAGASSERT(len == bufsiz);\r
98 _DIAGASSERT(buf[len] == '\0');\r
2aa62f2b 99\r
05c7d5f6 100 /* Let strto{f,d,ld}() do most of the work for us. */\r
101 val = _STRTOD_FUNC(buf, &end);\r
102 if (buf == end) {\r
103 free(buf);\r
104 goto no_convert;\r
105 }\r
2aa62f2b 106\r
05c7d5f6 107 /*\r
108 * We only know where the number ended in the _multibyte_\r
109 * representation of the string. If the caller wants to know\r
110 * where it ended, count multibyte characters to find the\r
111 * corresponding position in the wide char string.\r
112 */\r
113 if (endptr != NULL)\r
114 /* XXX Assume each wide char is one byte. */\r
115 *endptr = __UNCONST(start + (size_t)(end - buf));\r
2aa62f2b 116\r
05c7d5f6 117 free(buf);\r
2aa62f2b 118\r
05c7d5f6 119 return val;\r
2aa62f2b 120\r
121no_convert:\r
05c7d5f6 122 if (endptr != NULL)\r
123 *endptr = __UNCONST(nptr);\r
124 return 0.0;\r
2aa62f2b 125}\r
126#endif /*__WCSTOD_H_*/\r