6502/cc65
1
0
Fork 0
mirror of https://github.com/cc65/cc65.git synced 2024-12-25 02:29:52 +00:00
Code Issues Projects Releases Wiki Activity

Merge pull request #67 from greg-king5/echo

Browse Source 
CBM stdin Console RETURN-key Echo
This commit is contained in:
Oliver Schmidt 2013-12-26 06:54:42 -08:00
commit e267addb5b
1 changed files with 22 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
libsrc/cbm/read.s
View File

@ -1,5 +1,6 @@
;
; Ullrich von Bassewitz, 16.11.2002
; 2002-11-16, Ullrich von Bassewitz
; 2013-12-23, Greg King
;
; int read (int fd, void* buf, unsigned count);
;
@ -7,7 +8,7 @@
.export _read
.constructor initstdin
.import SETLFS, OPEN, CHKIN, BASIN, CLRCH, READST
.import SETLFS, OPEN, CHKIN, BASIN, CLRCH, BSOUT, READST
.import rwcommon
.import popax
.importzp ptr1, ptr2, ptr3, tmp1, tmp2, tmp3
@ -51,14 +52,20 @@
adc #LFN_OFFS ; Carry is already clear
tax
lda fdtab-LFN_OFFS,x; Get flags for this handle
tay
and #LFN_READ ; File open for writing?
beq invalidfd
; Check the EOF flag. If it is set, don't read anything
lda fdtab-LFN_OFFS,x; Get flags for this handle
tya ; Get flags again
bmi eof
; Remember the device number.
ldy unittab-LFN_OFFS,x
sty unit
; Valid lfn. Make it the input file
jsr CHKIN
@ -69,8 +76,13 @@
@L0: jsr BASIN
sta tmp1 ; Save the input byte
ldx unit
bne @L0_1 ; Not keyboard/screen-editor
cmp #$0D ; Is it a Carriage Return?
bne @L0_1
jsr BSOUT ; Yes, echo it (because editor didn't)
jsr READST ; Read the IEEE status
@L0_1: jsr READST ; Read the IEEE status
sta tmp3 ; Save it
and #%10111111 ; Check anything but the EOI bit
bne devnotpresent ; Assume device not present
@ -138,4 +150,10 @@ invalidfd:
.endproc
;--------------------------------------------------------------------------
.bss
unit: .res 1