1#include "stdio_impl.h"
2
3/* This function assumes it will never be called if there is already
4 * data buffered for reading. */
5
6int __uflow(FILE* f) {
7    unsigned char c;
8    if (!__toread(f) && f->read(f, &c, 1) == 1)
9        return c;
10    return EOF;
11}
12