mirror of
https://github.com/forth-ev/VolksForth.git
synced 2024-06-01 06:41:37 +00:00
94 lines
2.3 KiB
Forth
94 lines
2.3 KiB
Forth
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variable tibeof tibeof off
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: eolf? ( c -- f )
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\ f=-1: not yet eol; store c and continue
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\ f=0: eol but not yet eof; return line and flag continue
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\ f=1: eof: return line and flag eof
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tibeof off
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dup #lf = IF drop 0 exit THEN
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-1 = IF tibeof on 1 ELSE -1 THEN ;
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\ *** Block No. 3, Hexblock 3
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\ incfile incpos inc-fgetc phz 06feb22
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variable incfile
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variable incpos 2 allot
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: inc-fgetc ( -- c )
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incfile @ f.handle @ 0= IF
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incpos 2@ incfile @ fseek THEN
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incfile @ fgetc
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incpos 2@ 1. d+ incpos 2! ;
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\ *** Block No. 4, Hexblock 4
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\ freadline probe-for-fb phz 06feb22
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: freadline ( -- eof )
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tib /tib bounds DO
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inc-fgetc dup eolf? under 0< IF I c! ELSE drop THEN
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0< 0= IF I tib - #tib ! ENDLOOP tibeof @ exit THEN
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LOOP /tib #tib !
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." warning: line exteeds max " /tib . cr
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." extra chars ignored" cr
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BEGIN inc-fgetc eolf? 1+ UNTIL tibeof @ ;
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| : probe-for-fb ( -- flag )
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\ probes whether current file looks like a block file
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/tib 2+ 0 DO isfile@ fgetc #lf = IF ENDLOOP false exit THEN
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LOOP true ;
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\ *** Block No. 5, Hexblock 5
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\ save/restoretib phz 16jan22
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$50 constant /stash
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create stash[ /stash allot here constant ]stash
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variable stash> stash[ stash> !
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: savetib ( -- n )
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#tib @ >in @ - dup stash> @ + ]stash u>
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abort" tib stash overflow" >r
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tib >in @ + stash> @ r@ cmove
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r@ stash> +! r> ;
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: restoretib ( n -- )
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dup >r negate stash> +! stash> @ tib r@ cmove
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r> #tib ! >in off ;
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\ *** Block No. 6, Hexblock 6
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\ interpret-via-tib include phz 06feb22
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: interpret-via-tib
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BEGIN freadline >r .status >in off interpret
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r> UNTIL ;
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Defer include-load
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| : block-not-implemented 1 abort" block file access not implemented" ;
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' block-not-implemented IS include-load
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: include ( -- )
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pushfile use cr file?
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probe-for-fb isfile@ freset IF 1 include-load close exit THEN
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incfile push isfile@ incfile !
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incpos push incpos off incpos 2+ dup push off
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savetib >r interpret-via-tib close r> restoretib ;
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: (stashquit stash[ stash> ! (quit ;
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: stashrestore ['] (stashquit IS 'quit ;
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' stashrestore IS 'restart
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