/* Assuming the stream STREAM is open for reading:
Return a pointer to the input buffer of STREAM, or NULL.
If the returned pointer is non-NULL, *SIZEP is set to the (positive) size
/* Assuming the stream STREAM is open for reading:
Return a pointer to the input buffer of STREAM, or NULL.
If the returned pointer is non-NULL, *SIZEP is set to the (positive) size