1 /* $OpenBSD: wcstod.c,v 1.1 2005/07/01 08:59:27 espie Exp $ */
2 /* $NetBSD: wcstod.c,v 1.4 2001/10/28 12:08:43 yamt Exp $ */
3
4 /*-
5 * Copyright (c) 2006, 2010, 2012 MirOS Project,
6 * Copyright (c)1999, 2000, 2001 Citrus Project,
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 * $Citrus: xpg4dl/FreeBSD/lib/libc/locale/wcstod.c,v 1.2 2001/09/27 16:23:57 yamt Exp $
31 */
32
33 #include <sys/cdefs.h>
34 #include <errno.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <wchar.h>
38 #include <wctype.h>
39
40 __RCSID("$MirOS: src/lib/libc/locale/wcstod.c,v 1.6 2014/02/09 22:35:55 tg Exp $");
41
42 const wchar_t mbsd_digits_Ldec[] = L"0123456789";
43
44 double
wcstod(const wchar_t * nptr,wchar_t ** endptr)45 wcstod(const wchar_t *nptr, wchar_t **endptr)
46 {
47 const wchar_t *src;
48 size_t size;
49 const wchar_t *start;
50
51 /*
52 * check length of string and call strtod
53 */
54 src = nptr;
55
56 /* skip space first */
57 while (iswspace(*src)) {
58 src++;
59 }
60
61 /* get length of string */
62 start = src;
63 if (wcschr(L"+-", *src))
64 src++;
65 size = wcsspn(src, mbsd_digits_Ldec);
66 src += size;
67 if (*src == L'.') {/* XXX use localeconv */
68 src++;
69 size = wcsspn(src, mbsd_digits_Ldec);
70 src += size;
71 }
72 if (wcschr(L"Ee", *src)) {
73 src++;
74 if (wcschr(L"+-", *src))
75 src++;
76 size = wcsspn(src, mbsd_digits_Ldec);
77 src += size;
78 }
79 size = src - start;
80
81 /*
82 * convert to a char-string and pass it to strtod.
83 *
84 * since all mb chars used to represent a double-constant
85 * are in the portable character set, we can assume
86 * that they are 1-byte chars.
87 */
88 if (size)
89 {
90 mbstate_t st;
91 char *buf;
92 char *end;
93 const wchar_t *s;
94 size_t size_converted;
95 double result;
96
97 buf = malloc(size + 1);
98 if (!buf) {
99 /* error */
100 errno = ENOMEM; /* XXX */
101 return 0;
102 }
103
104 s = start;
105 memset(&st, 0, sizeof(st));
106 size_converted = wcsrtombs(buf, &s, size, &st);
107 if (size != size_converted) {
108 /* XXX should not happen */
109 free(buf);
110 errno = EILSEQ;
111 return 0;
112 }
113
114 buf[size] = 0;
115 result = strtod(buf, &end);
116
117 free(buf);
118
119 if (endptr)
120 /* LINTED bad interface */
121 *endptr = (wchar_t*)start + (end - buf);
122
123 return result;
124 }
125
126 if (endptr)
127 /* LINTED bad interface */
128 *endptr = (wchar_t*)start;
129
130 return 0;
131 }
132
133 float
wcstof(const wchar_t * nptr,wchar_t ** endptr)134 wcstof(const wchar_t *nptr, wchar_t **endptr)
135 {
136 return ((float)wcstod(nptr, endptr));
137 }
138