Query ed mode
query_ed_mode() - find out the status of the current ed session
This efun is available only if __OLD_ED__ is not defined. Finds the status of the ed session for the current object, if one exists. It returns: 0 - the current object is at a normal ed prompt (':') -1 - the current object isn't in ed -2 - the current object is at the more prompt in the middle of help >0 - the object is at a prompt for a line. The number is the line number.