__uflow.c\stdio\src - musl - musl - an implementation of the standard library for Linux-based systems

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