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   FILE             A structure, defined in stdio.h This structure is_
                    used  in all stream input and  output  operations.
                    The fields of the structure hold information about
                    the current state of the stream.


                    Definition:
                       typedef struct _iobuf{
                          char   *_ptr;
                          /* pointer to next character position  */
                          int   _cnt;
                          /* number of characters left in buffer */
                          char   *_base;
                          /* pointer to start of buffer          */
                          int   _flag;
                          /* various info about this channel     */
                          int   _file;
                          /* file "handle"                       */
                          unsigned _bufsiz;
                          /* size of buffer being used           */
                          #ifdef   BIGBUF
                             int   _seg;
                             /* segment of buffer if _IOBIGBUF   */
                          #endif
                       } FILE;