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This function executes a ^N (control-N or caret-N) command.
^N <CTRL/N> (caret/N) is the end of file flag. It is
equivalent to -1 if the file open on the currently
selected input stream is at end of file, and zero
#include "zport.h" /* define portability identifiers */
#include "tecoc.h" /* define general identifiers */
#include "defext.h" /* define external global variables */
DEFAULT ExeCtN() /* execute a ^N (control-N) command */
return PushEx((IsEofI[CurInp] ? -1L : 0L), OPERAND);