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118 lines
2.6 KiB
ArmAsm
118 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 rwcommon
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.importzp sp, ptr1, ptr2, ptr3
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.include "cbm.inc"
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.include "errno.inc"
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.include "fcntl.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 "ONCE"
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.proc initstdout
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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 invalidfd ; Invalid handle
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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 invalidfd
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; Valid lfn. Make it the output file
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jsr CKOUT
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bcc @L2
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@error: jmp __mappederrno ; Store into __oserror, map to errno, return -1
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; Output the next character from the buffer
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@L0: ldy #0
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lda (ptr1),y
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inc ptr1
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bne @L1
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inc ptr1+1 ; A = *buf++;
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@L1: jsr BSOUT
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; Check the status
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pha
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jsr READST
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lsr a ; Bit zero is write timeout
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bne devnotpresent2
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pla
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bcs @L3
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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 ptr2
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bne @L0
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inc ptr2+1
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bne @L0
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; Wrote all chars or disk full. Close the output channel
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@L3: jsr CLRCH
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; Clear _oserror and return the number of chars written
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lda #0
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sta __oserror
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lda ptr3
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ldx ptr3+1
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rts
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; Error entry: Device not present
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devnotpresent2:
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pla
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devnotpresent:
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lda #ENODEV
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jmp __directerrno ; Sets _errno, clears _oserror, returns -1
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; Error entry: The given file descriptor is not valid or not open
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invalidfd:
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lda #EBADF
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jmp __directerrno ; Sets _errno, clears _oserror, returns -1
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.endproc
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