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cc65/libsrc/common/maperrno.s

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;
; Ullrich von Bassewitz, 24.06.2000
;
; void _maperrno(void);
; /* Map an OS error to a system independent error code */
;
.export __maperrno
.import __errno
.import __oserror
.import __osmaperrno
.code
__maperrno:
lda __oserror ; Get the error code
beq @L1 ; Jump if no error
ldx #$00 ; Clear error
stx __oserror
jsr __osmaperrno ; Map the code
sta __errno
stx __errno+1
@L1: rts