1#include "stdio_impl.h"
2#include "locale_impl.h"
3#include <wchar.h>
4#include <errno.h>
5
6static wint_t __fgetwc_unlocked_internal(FILE *f)
7{
8	mbstate_t st = { 0 };
9	wchar_t wc;
10	int c;
11	unsigned char b;
12	size_t l;
13
14	/* Convert character from buffer if possible */
15	if (f->rpos < f->rend) {
16		l = mbrtowc(&wc, (void *)f->rpos, f->rend - f->rpos, &st);
17		if (l+2 >= 2) {
18			f->rpos += l + !l; /* l==0 means 1 byte, null */
19			return wc;
20		}
21		if (l == -1) {
22			f->rpos++;
23			return WEOF;
24		}
25	} else l = -2;
26
27	/* Convert character byte-by-byte */
28	while (l == -2) {
29		b = c = getc_unlocked(f);
30		if (c < 0) {
31			if (!mbsinit(&st)) errno = EILSEQ;
32			return WEOF;
33		}
34		l = mbrtowc(&wc, (void *)&b, 1, &st);
35		if (l == -1) return WEOF;
36	}
37
38	return wc;
39}
40
41wint_t __fgetwc_unlocked(FILE *f)
42{
43	locale_t *ploc = &CURRENT_LOCALE, loc = *ploc;
44	if (f->mode <= 0) fwide(f, 1);
45	*ploc = f->locale;
46	wchar_t wc = __fgetwc_unlocked_internal(f);
47	*ploc = loc;
48	return wc;
49}
50
51wint_t fgetwc(FILE *f)
52{
53	wint_t c;
54	FLOCK(f);
55	c = __fgetwc_unlocked(f);
56	FUNLOCK(f);
57	return c;
58}
59
60weak_alias(__fgetwc_unlocked, fgetwc_unlocked);
61weak_alias(__fgetwc_unlocked, getwc_unlocked);
62