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git-svn-id: svn://svn.cc65.org/cc65/trunk@1531 b7a2c559-68d2-44c3-8de9-860c34a00d81
87 lines
1.7 KiB
ArmAsm
87 lines
1.7 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 16.11.2002
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;
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; int __fastcall__ close (int fd);
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;
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.export _close
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.import getdiskerror
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.import __errno, __oserror
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.include "errno.inc"
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.include "cbm.inc"
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.include "filedes.inc"
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;--------------------------------------------------------------------------
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; _close
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.proc _close
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; Check if we have a valid handle
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cpx #$00
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bne invalidfd
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cmp #MAX_FDS ; Is it valid?
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bcs invalidfd ; Jump if no
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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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beq notopen
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; Valid lfn, close it. The close call is always error free, at least as far
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; as the kernal is involved
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lda #LFN_CLOSED
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sta fdtab-LFN_OFFS,x
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lda unittab,x
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pha ; Push unit for this file
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txa
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jsr CLOSE
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pla
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; Read the drive error channel
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lda unittab,x
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tax
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jsr getdiskerror
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cmp #$00
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bne error
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; Successful
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tax
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rts
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; Error entry, file descriptor is invalid
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invalidfd:
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lda #EINVAL
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sta __errno
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lda #0
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sta __errno+1
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beq errout
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; Error entry, file is not open
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notopen:
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lda #3 ; File not open
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bne error
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; Error entry, status not ok
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error: sta __oserror
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errout: lda #$FF
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tax ; Return -1
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rts
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.endproc
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