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#include "stdio_impl.h"
#include "locale_impl.h"
#include <wchar.h>
#include <limits.h>
#include <ctype.h>
#include <string.h>
wint_t ungetwc(wint_t c, FILE *f)
{
unsigned char mbc[MB_LEN_MAX];
int l;
locale_t *ploc = &CURRENT_LOCALE, loc = *ploc;
FLOCK(f);
if (f->mode <= 0) fwide(f, 1);
*ploc = f->locale;
if (!f->rpos) __toread(f);
if (!f->rpos || c == WEOF || (l = wcrtomb((void *)mbc, c, 0)) < 0 ||
f->rpos < f->buf - UNGET + l) {
FUNLOCK(f);
*ploc = loc;
return WEOF;
}
if (isascii(c)) *--f->rpos = c;
else memcpy(f->rpos -= l, mbc, l);
f->flags &= ~F_EOF;
FUNLOCK(f);
*ploc = loc;
return c;
}
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