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ed: fix broken buf insert logic

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Virgil Dupras 2019-07-21 10:52:36 -04:00
parent 1a5a1b9861
commit 8d7abd9994
1 changed files with 5 additions and 2 deletions
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7
apps/ed/buf.asm
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@ -147,9 +147,12 @@ bufInsertLine:
; when it's time to insert the line in the space we make. ; when it's time to insert the line in the space we make.
ld hl, (BUF_LINECNT) ld hl, (BUF_LINECNT)
call bufLineAddr call bufLineAddr
; HL is pointing to *first byte* after last line. Our source needs to
; be the second byte of the last line and our dest is the second byte
; after the last line.
push hl \ pop de push hl \ pop de
dec hl dec hl ; second byte of last line
dec hl inc de ; second byte beyond last line
; HL = BUF_LINECNT-1, DE = BUF_LINECNT, BC is set. We're good! ; HL = BUF_LINECNT-1, DE = BUF_LINECNT, BC is set. We're good!
lddr lddr
; We still need to increase BUF_LINECNT ; We still need to increase BUF_LINECNT