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119 lines
2.6 KiB
ArmAsm
119 lines
2.6 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 16.11.2002
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;
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; int write (int fd, const void* buf, unsigned count);
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;
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.export _write
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.constructor initstdout
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.import SETLFS, OPEN, CKOUT, BSOUT, CLRCH
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.import rwcommon
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.import __oserror
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.importzp sp, ptr1, ptr2, ptr3
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.include "fcntl.inc"
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.include "cbm.inc"
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.include "filedes.inc"
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;--------------------------------------------------------------------------
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; initstdout: Open the stdout and stderr file descriptors for the screen.
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.segment "INIT"
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.proc initstdout
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lda #LFN_WRITE
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sta fdtab+STDOUT_FILENO
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sta fdtab+STDERR_FILENO
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lda #CBMDEV_SCREEN
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sta unittab+STDOUT_FILENO
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sta unittab+STDERR_FILENO
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lda #STDOUT_FILENO + LFN_OFFS
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jsr @L1
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lda #STDERR_FILENO + LFN_OFFS
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@L1: ldx #CBMDEV_SCREEN
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ldy #$FF
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jsr SETLFS
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jmp OPEN ; Will always succeed
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.endproc
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;--------------------------------------------------------------------------
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; _write
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.code
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.proc _write
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jsr rwcommon ; Pop params, check handle
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bcs errout ; Invalid handle, errno already set
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; Check if the LFN is valid and the file is open for writing
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adc #LFN_OFFS ; Carry is already clear
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tax
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lda fdtab-LFN_OFFS,x; Get flags for this handle
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and #LFN_WRITE ; File open for writing?
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beq notopen
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; Valid lfn. Make it the output file
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jsr CKOUT
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bcs error
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bcc @L2
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; Output the next character from the buffer
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@L0: ldy #0
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lda (ptr2),y
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inc ptr2
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bne @L1
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inc ptr2+1 ; A = *buf++;
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@L1: jsr BSOUT
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bcs error ; Bail out on errors
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; Count characters written
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inc ptr3
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bne @L2
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inc ptr3+1
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; Decrement count
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@L2: inc ptr1
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bne @L0
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inc ptr1+1
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bne @L0
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; Wrote all chars, close the output channel
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jsr CLRCH
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; Return the number of chars written
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lda ptr3
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ldx ptr3+1
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rts
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; Error entry, file is not open
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notopen:
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lda #3 ; File not open
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bne error
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; Error entry, status not ok
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error5: lda #5 ; Device not present
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error: sta __oserror
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errout: lda #$FF
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tax ; Return -1
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rts
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.endproc
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