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cd552515fb
Move declaration of __errno into errno.inc. git-svn-id: svn://svn.cc65.org/cc65/trunk@1552 b7a2c559-68d2-44c3-8de9-860c34a00d81
93 lines
2.1 KiB
ArmAsm
93 lines
2.1 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 CLOSE
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.import readdiskerror, closecmdchannel
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.import __oserror
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.importzp tmp2
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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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sta tmp2 ; Save the handle
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; Check if the file is actually open
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tax
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lda fdtab,x ; Get flags for this handle
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and #LFN_OPEN
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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,x
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lda tmp2 ; Get the handle
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clc
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adc #LFN_OFFS ; Make LFN from handle
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jsr CLOSE
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; Read the drive error channel, then close it
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ldy tmp2 ; Get the handle
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ldx unittab,y ; Get teh disk for this handle
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jsr readdiskerror ; Read the disk error code
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pha ; Save it on stack
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ldy tmp2
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ldx unittab,y
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jsr closecmdchannel ; Close the disk command channel
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pla ; Get the error code from the disk
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bne error ; Jump if error
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; Successful
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tax ; Return zero in a/x
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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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