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