mirror of https://github.com/hsoft/collapseos.git
44 lines
751 B
NASM
44 lines
751 B
NASM
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; io - handle ed's I/O
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; *** Consts ***
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;
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; Max length of a line
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.equ IO_MAXLEN 0x7f
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; *** Variables ***
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; Buffer for lines read from I/O.
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.equ IO_LINE IO_RAMSTART
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.equ IO_RAMEND IO_LINE+IO_MAXLEN+1 ; +1 for null
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; *** Code ***
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; Given an offset HL, read the line in IO_LINE, without LF and null terminates
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; it. Make HL point to IO_LINE.
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ioGetLine:
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push af
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push de
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push bc
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ld de, 0 ; limit ourselves to 16-bit for now
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xor a ; absolute seek
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call blkSeek
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ld hl, IO_LINE
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ld b, IO_MAXLEN
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.loop:
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call blkGetC
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jr nz, .loopend
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or a ; null? hum, weird. same as LF
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jr z, .loopend
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cp 0x0a
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jr z, .loopend
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ld (hl), a
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inc hl
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djnz .loop
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.loopend:
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; null-terminate the string
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xor a
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ld (hl), a
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ld hl, IO_LINE
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pop bc
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pop de
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pop af
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ret
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