VolksForth/8080/CPM/cpmfiles/include.fb

\ include for stream sources for cp/m                phz 30aug23                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                \ load screen                                        phz 02sep23                                                                  onlyforth dos also forth definitions                                                                                            : idos-error?  ( n -- f )  0<> ;                                : iread-seq  ( dosfcb -- f )  $14 bdosa  idos-error? ;          : cr+ex@  ( fcb -- cr+256*ex )                                    dup &34 + c@  swap &14 + c@ $100 * + ;                        : cr+ex!  ( cr+256*ex fcb -- )                                    >r $100 u/mod  r@ &14 + c!  r> &34 + c! ;                                                                                     1 7 +thru                                                                                                                                                                                                                                                                                                                     \ fib /fib #fib eolf?                                phz 07mai23                                                                  context @ dos also context !                                    $50 constant /tib                                               variable tibeof tibeof off                                      $1a constant ctrl-z                                                                                                             : 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                                   ctrl-z = IF tibeof on  1 ELSE -1 THEN ;                                                                                                                                                     \ incfile incpos inc-fgetc                           phz 02sep23                                                                  variable incfile                                                variable increc                                                 variable rec-offset                                             $80 constant dmabuf    | $ff constant dmabuf-last                                                                               : readrec  ( fcb -- f )                                           dup cr+ex@ increc !                                             rec-offset off  dmabuf dma!  drive iread-seq ;                                                                                : inc-fgetc  ( -- c )                                             rec-offset @ b/rec u< 0=                                          IF incfile @ readrec IF ctrl-z exit THEN THEN                 rec-offset @ dmabuf + c@  1 rec-offset +! ;                                                                                 \ freadline probe-for-fb                             phz 25aug23                                                                  : freadline ( -- eof )                                          tib /tib bounds DO                                                inc-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 inc-fgetc eolf? 1+ UNTIL tibeof @ ;                                                                                     | : probe-for-fb  ( -- flag )                                     dmabuf BEGIN dup c@ #lf = IF drop 0 exit THEN                          1+ dup dmabuf-last u> UNTIL drop 1 ;                                                                                                                                                   \ save/restoretib                                    phz 06okt22                                                                  $50 constant /stash                                             create stash[  /stash allot  here constant ]stash               variable stash>   stash[ stash> !                                                                                               : savetib  ( -- n )                                                 #tib @ >in @ -  dup stash> @ + ]stash u>                          abort" tib stash overflow"   >r                               tib >in @ +  stash> @  r@ cmove                                 r@ stash> +!  r> ;                                                                                                          : restoretib  ( n -- )                                              dup >r negate stash> +!   stash> @ tib r@ cmove                 r> #tib !  >in off ;                                                                                                      \ interpret-via-tib inner-include                    phz 02sep23                                                                  : interpret-via-tib                                             BEGIN freadline >r .status >in off  interpret  r> UNTIL ;                                                                       : include-inner ( -- )                                          increc push  0 isfile@ cr+ex!                                   isfile@ readrec Abort" can't read start of file"                probe-for-fb IF 1 load exit THEN                                incfile push  isfile@ incfile !                                 savetib >r  interpret-via-tib close  r> restoretib ;                                                                                                                                                                                                                                                                                                                                          \ include                                            phz 02sep23                                                                  : include ( -- )                                                rec-offset push  isfile push  fromfile push                     use  cr file?                                                   include-inner                                                   incfile @                                                         IF increc @ incfile @ cr+ex!                                    incfile @ readrec Abort" error re-reading after include"        THEN ;                                                                                                                                                                                                                                                                                                                                                                                                                                                      \ \                                                  phz 02sep23                                                                  : (stashquit  stash[ stash> !  incfile off  increc off            (quit ;                                                       : stashrestore  ['] (stashquit IS 'quit ;                       ' stashrestore IS 'restart                                                                                                      : \  blk @ IF >in @ negate  c/l mod  >in +!                          ELSE #tib @ >in ! THEN ; immediate                                                                                       \ : \needs  have 0=exit                                         \      blk @ IF >in @ negate  c/l mod  >in +!                   \      ELSE #tib @ >in ! THEN ;