VolksForth/8086/msdos/INCLUDE.FB

\ include for stream sources                         phz 06jan22                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                \ load screen                                        phz 06jan22                                                                  1 3 +thru                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     \ fib /fib #fib eolf?                                phz 06jan22                                                                  context @ dos also context !                                    $50 constant /tib                                               variable tibeof tibeof off                                                                                                      : eolf? ( c -- f )                                                \ f=-1: not yet eol; store c and continue                       \ f=0: eol but not yet eof; return line and flag continue       \ f=1: eof: return line and flag eof                           tibeof off                                                       dup #lf = IF drop 0 exit THEN                                   -1 = IF tibeof on  1 ELSE -1 THEN ;                                                                                                                                                                                                                         \ freadline probe-for-fb                             phz 06jan22                                                                  : freadline ( -- eof )                                          tib /tib bounds DO                                                isfile@ fgetc dup eolf? under 0< IF I c! ELSE drop THEN         0< 0= IF I tib - #tib ! ENDLOOP tibeof @ exit THEN            LOOP /tib #tib !                                                ." warning: line exteeds max " /tib . cr                        ." extra chars ignored" cr                                      BEGIN isfile@ fgetc eolf? 1+ UNTIL tibeof @ ;                                                                                   : probe-for-fb  ( -- flag )                                       \ probes whether current file looks like a block file         /tib 2+ 0 DO isfile@ fgetc #lf = IF ENDLOOP false exit THEN     LOOP true ;                                                                                                                   \ interpret-via-tib include                          phz 06jan22                                                                  : interpret-via-tib                                             BEGIN freadline >r .status >in off interpret                    r> UNTIL ;                                                                                                                      : include ( -- )                                                pushfile use                                                    probe-for-fb isfile@ freset IF 1 load close exit THEN           blk @ Abort" no include from blk"                               interpret-via-tib close                                         #tib off  >in off ;