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#include "stdio_impl.h"
int ungetc(int c, FILE *f)
{
if (c == EOF) return c;
FLOCK(f);
if ((!f->rend && __toread(f)) || f->rpos <= f->buf - UNGET) {
FUNLOCK(f);
return EOF;
}
*--f->rpos = c;
f->flags &= ~F_EOF;
FUNLOCK(f);
return c;
}
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