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36 lines
1.0 KiB
ArmAsm
36 lines
1.0 KiB
ArmAsm
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; Ullrich von Bassewitz, 2003-08-12
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; Helper function for several high level file functions.
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;
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; The function will store the value in A into _oserror. If the value is not
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; zero, it is translated into a standard error number which is then stored
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; into errno, and -1 is returned in a/x. If the value in A was zero, errno
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; is not changed, and zero is returned in a/x.
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;
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.export oserrcheck
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.import __oserror
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.import __osmaperrno
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.import __errno
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.proc oserrcheck
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sta __oserror ; Store the error code
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tay ; Did we have an error?
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beq ok ; Branch if no
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jsr __osmaperrno ; Map os error into errno code
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sta __errno
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stx __errno+1 ; Save in errno
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lda #$FF ; Return -1
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; Error free, A contains zero
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ok: tax ; Make high byte also zero
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rts
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.endproc
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