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Certain scenarios (e.g. not running any Applesoft program at all since booting DOS 3.3) can make DOS 3.3 consider cc65 device input (e.g. getchar()) that reads a CR interpreting the command in the keyboard buffer. Setting the hibyte of the Applesoft currently executed line number to some value <> $FF (beside setting the input prompt to some value <> ']') makes DOS 3.3 understand that we're not in intermediate mode and that therefore I/O not preceded with ctrl-d mustn't be fiddled with (see DOS 3.3 routine at $A65E).
111 lines
2.5 KiB
ArmAsm
111 lines
2.5 KiB
ArmAsm
;
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; Oliver Schmidt, 12.01.2005
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;
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; int __fastcall__ read (int fd, void* buf, unsigned count);
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;
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.constructor initprompt
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.export _read
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.import rwprolog, rwcommon
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.import RDKEY, COUT
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.include "zeropage.inc"
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.include "errno.inc"
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.include "fcntl.inc"
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.include "mli.inc"
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.include "filedes.inc"
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.include "apple2.inc"
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.segment "ONCE"
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initprompt:
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; Set prompt <> ']' and currently executed Applesoft
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; line number hibyte <> $FF to let DOS 3.3 (at $A65E)
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; know that we're not in Applesoft immediate mode and
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; thus keep it from scanning our device I/O for DOS
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; commands.
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lda #$80 ; Same value used at $D52C
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sta PROMPT
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sta CURLIN+1 ; Any value <> $FF will do
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rts
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.code
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_read:
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; Get parameters
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jsr rwprolog
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bcs errno
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tax ; Save fd
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; Check for read access
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lda fdtab + FD::FLAGS,y
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and #O_RDONLY
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beq einval
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; Check for device
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txa ; Restore fd
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bmi device
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; Do read
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ldy #READ_CALL
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jmp rwcommon
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; Device succeeds always
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device: lda #$00
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sta __oserror
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; Set counter to zero
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sta ptr3
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sta ptr3+1
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; Check for zero count
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lda ptr2
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ora ptr2+1
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beq check
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; Read from device and echo to device
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next: jsr RDKEY
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jsr COUT
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; Clear hi bit and check for '\r'
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and #$7F
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cmp #$0D
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bne :+
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; Replace with '\n' and set count to zero
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lda #$0A
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ldy #$00
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sty ptr2
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sty ptr2+1
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; Put char into buf
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: ldy #$00
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sta (ptr1),y
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; Increment pointer
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inc ptr1
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bne :+
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inc ptr1+1
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; Increment counter
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: inc ptr3
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bne check
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inc ptr3+1
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; Check for counter less than count
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check: lda ptr3
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cmp ptr2
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bcc next
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ldx ptr3+1
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cpx ptr2+1
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bcc next
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; Return success, AX already set
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rts
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; Load errno code
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einval: lda #EINVAL
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; Set __errno
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errno: jmp __directerrno
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