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apps/ed: first steps
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7
apps/ed/glue.asm
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7
apps/ed/glue.asm
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@ -0,0 +1,7 @@
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#include "user.h"
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.org USER_CODE
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jp edMain
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#include "ed/main.asm"
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62
apps/ed/main.asm
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62
apps/ed/main.asm
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; ed - line editor
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;
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; A text editor modeled after UNIX's ed, but simpler. The goal is to stay tight
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; on resources and to avoid having to implement screen management code (that is,
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; develop the machinery to have ncurses-like apps in Collapse OS).
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;
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; ed has a mechanism to avoid having to move a lot of memory around at each
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; edit. Each line is an element in an doubly-linked list and each element point
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; to an offset in the "scratchpad". The scratchpad starts with the file
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; contents and every time we change or add a line, that line goes to the end of
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; the scratch pad and linked lists are reorganized whenever lines are changed.
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; Contents itself is always appended to the scratchpad.
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;
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; That's on a resourceful UNIX system.
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;
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; That doubly linked list on the z80 would use 7 bytes per line (prev, next,
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; offset, len), which is a bit much. Moreover, there's that whole "scratchpad
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; being loaded in memory" thing that's a bit iffy. We sacrifice speed for
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; memory usage.
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;
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; So here's what we do. First, we have two scratchpads. The first one is the
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; file being read itself. The second one is is memory, for modifications we
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; make to the file. When reading the file, we note the offset at which it ends.
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; All offsets under this limit refer to the first scratchpad. Other offsets
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; refer to the second.
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;
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; Then, our line list if just an array of 16-bit offsets. This means that we
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; don't have an easy access to line length and we have to move a lot of memory
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; around whenever we add or delete lines. Hopefully, "LDIR" will be our friend
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; here...
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;
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; *** Requirements ***
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; printstr
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; printcrlf
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; stdioReadC
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; stdioGetLine
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edMain:
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edLoop:
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ld hl, .prompt
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call printstr
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.inner:
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call stdioReadC
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jr nz, .inner ; not done? loop
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; We're done. Process line.
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call printcrlf
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call stdioGetLine
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call edProcessLine
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ret z
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jr edLoop
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.prompt:
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.db ":", 0
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; Sets Z if we need to quit
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edProcessLine:
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call printstr
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ld a, (hl)
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cp 'q'
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ret z
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call printcrlf
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jp unsetZ
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1
tools/emul/.gitignore
vendored
1
tools/emul/.gitignore
vendored
@ -3,4 +3,5 @@
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/runbin/runbin
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/*/*-bin.h
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/cfsin/zasm
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/cfsin/ed
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/cfsin/user.h
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@ -4,7 +4,7 @@ KERNEL = ../../kernel
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APPS = ../../apps
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ZASMBIN = zasm/zasm
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ZASMSH = ../zasm.sh
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SHELLAPPS = $(addprefix cfsin/, zasm)
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SHELLAPPS = $(addprefix cfsin/, zasm ed)
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CFSIN_CONTENTS = $(SHELLAPPS) cfsin/user.h
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.PHONY: all
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@ -34,6 +34,9 @@
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jp _blkPutC
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jp _blkSeek
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jp _blkTell
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jp printcrlf
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jp stdioReadC
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jp stdioGetLine
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#include "core.asm"
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#include "err.h"
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@ -4,26 +4,29 @@
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.equ BLOCKDEV_SIZE 8
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; *** JUMP TABLE ***
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.equ strncmp 0x03
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.equ addDE 0x06
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.equ addHL 0x09
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.equ upcase 0x0c
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.equ unsetZ 0x0f
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.equ intoDE 0x12
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.equ intoHL 0x15
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.equ writeHLinDE 0x18
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.equ findchar 0x1b
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.equ parseHex 0x1e
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.equ parseHexPair 0x21
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.equ blkSel 0x24
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.equ blkSet 0x27
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.equ fsFindFN 0x2a
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.equ fsOpen 0x2d
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.equ fsGetC 0x30
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.equ cpHLDE 0x33
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.equ parseArgs 0x36
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.equ printstr 0x39
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.equ _blkGetC 0x3c
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.equ _blkPutC 0x3f
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.equ _blkSeek 0x42
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.equ _blkTell 0x45
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.equ strncmp 0x03
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.equ addDE 0x06
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.equ addHL 0x09
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.equ upcase 0x0c
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.equ unsetZ 0x0f
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.equ intoDE 0x12
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.equ intoHL 0x15
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.equ writeHLinDE 0x18
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.equ findchar 0x1b
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.equ parseHex 0x1e
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.equ parseHexPair 0x21
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.equ blkSel 0x24
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.equ blkSet 0x27
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.equ fsFindFN 0x2a
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.equ fsOpen 0x2d
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.equ fsGetC 0x30
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.equ cpHLDE 0x33
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.equ parseArgs 0x36
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.equ printstr 0x39
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.equ _blkGetC 0x3c
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.equ _blkPutC 0x3f
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.equ _blkSeek 0x42
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.equ _blkTell 0x45
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.equ printcrlf 0x48
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.equ stdioReadC 0x4b
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.equ stdioGetLine 0x4e
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