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| | #include "stdio_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=1;
FLOCK(f);
f->mode |= f->mode+1;
if (!f->rpos) __toread(f);
if (!f->rpos || f->rpos < f->buf - UNGET + l || c == WEOF ||
(!isascii(c) && (l = wctomb((void *)mbc, c)) < 0)) {
FUNLOCK(f);
return WEOF;
}
if (isascii(c)) *--f->rpos = c;
else memcpy(f->rpos -= l, mbc, l);
f->flags &= ~F_EOF;
FUNLOCK(f);
return c;
}
|