1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
| | #include "shgetc.h"
#include "floatscan.h"
#include "stdio_impl.h"
#include <wchar.h>
#include <wctype.h>
/* This read function heavily cheats. It knows:
* (1) len will always be 1
* (2) non-ascii characters don't matter */
static size_t do_read(FILE *f, unsigned char *buf, size_t len)
{
size_t i;
const wchar_t *wcs = f->cookie;
if (!wcs[0]) wcs=L"@";
for (i=0; i<f->buf_size && wcs[i]; i++)
f->buf[i] = wcs[i] < 128 ? wcs[i] : '@';
f->rpos = f->buf;
f->rend = f->buf + i;
f->cookie = (void *)(wcs+i);
if (i && len) {
*buf = *f->rpos++;
return 1;
}
return 0;
}
static long double wcstox(const wchar_t *s, wchar_t **p, int prec)
{
wchar_t *t = (wchar_t *)s;
unsigned char buf[64];
FILE f = {0};
f.flags = 0;
f.rpos = f.rend = 0;
f.buf = buf + 4;
f.buf_size = sizeof buf - 4;
f.lock = -1;
f.read = do_read;
while (iswspace(*t)) t++;
f.cookie = (void *)t;
shlim(&f, 0);
long double y = __floatscan(&f, prec, 1);
if (p) {
size_t cnt = shcnt(&f);
*p = cnt ? t + cnt : (wchar_t *)s;
}
return y;
}
float wcstof(const wchar_t *restrict s, wchar_t **restrict p)
{
return wcstox(s, p, 0);
}
double wcstod(const wchar_t *restrict s, wchar_t **restrict p)
{
return wcstox(s, p, 1);
}
long double wcstold(const wchar_t *restrict s, wchar_t **restrict p)
{
return wcstox(s, p, 2);
}
|