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ed: allow inserting in empty file

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This commit is contained in:
Virgil Dupras 2019-07-21 15:06:03 -04:00
parent 34f499184d
commit 421d881fae
2 changed files with 32 additions and 26 deletions
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2
apps/ed/buf.asm
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@ -29,6 +29,8 @@ bufInit:
ld de, BUF_PAD ; points to beginning of current line
ld ix, BUF_LINES ; points to current line index
ld bc, 0 ; line count
; init pad end in case we have an empty file.
ld (BUF_PADEND), hl
.loop:
call ioGetC
jr nz, .loopend

56
apps/ed/main.asm
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@ -69,38 +69,44 @@ edMain:
jr nz, .error
ld a, (CMD_TYPE)
cp 'q'
jr z, .doQuit
jr z, .doQ
cp 'w'
jr z, .doWrite
jr z, .doW
; The rest of the commands need an address
call edReadAddrs
jr nz, .error
ld a, (CMD_TYPE)
cp 'd'
jr z, .doDel
cp 'a'
jr z, .doAppend
cp 'i'
jr z, .doInsert
jr .doPrint
jr z, .doI
; The rest of the commands don't allow addr == cnt
push hl ; --> lvl 1
ld hl, (BUF_LINECNT)
call cpHLDE
pop hl ; <-- lvl 1
jr z, .error
cp 'd'
jr z, .doD
cp 'a'
jr z, .doA
jr .doP
.doQuit:
.doQ:
xor a
ret
.doWrite:
.doW:
ld a, 3 ; seek beginning
call ioSeek
ld de, 0 ; cur line
.writeLoop:
.wLoop:
push de \ pop hl
call bufGetLine ; --> buffer in (HL)
jr nz, .writeEnd
jr nz, .wEnd
call ioPutLine
jr nz, .error
inc de
jr .writeLoop
.writeEnd:
jr .wLoop
.wEnd:
; Set new file size
call ioTell
call ioSetSize
@ -108,14 +114,14 @@ edMain:
; TODO: reload buffer
xor a
ret
.doDel:
.doD:
; bufDelLines expects an exclusive upper bound, which is why we inc DE.
inc de
call bufDelLines
jr .mainLoop
.doAppend:
.doA:
inc de
.doInsert:
.doI:
call stdioReadLine ; --> HL
call bufScratchpadAdd ; --> HL
; insert index in DE, line offset in HL. We want the opposite.
@ -124,7 +130,7 @@ edMain:
call printcrlf
jr .mainLoop
.doPrint:
.doP:
push hl
call bufGetLine
jr nz, .error
@ -132,10 +138,10 @@ edMain:
call printcrlf
pop hl
call cpHLDE
jr z, .doPrintEnd
jr z, .doPEnd
inc hl
jr .doPrint
.doPrintEnd:
jr .doP
.doPEnd:
ld (ED_CURLINE), hl
jp .mainLoop
.error:
@ -168,12 +174,10 @@ edResolveAddr:
edReadAddrs:
ld ix, CMD_ADDR2
call edResolveAddr
ex de, hl
ld hl, (BUF_LINECNT)
ex de, hl ; HL: addr2 DE: cnt
ld de, (BUF_LINECNT)
ex de, hl ; HL: cnt DE: addr2
call cpHLDE
jp nc, unsetZ ; HL (addr2) >= DE (cnt). no good
ex de, hl ; DE: addr2
jp c, unsetZ ; HL (cnt) < DE (addr2). no good
ld ix, CMD_ADDR1
call edResolveAddr
ex de, hl ; HL: addr2, DE: addr1