fusl/src/stdio/__uflow.c

#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;
}