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36 lines
740 B
ArmAsm
36 lines
740 B
ArmAsm
;
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; Ullrich von Bassewitz, 17.05.2000
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;
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; char* __fastcall__ strerror (int errcode);
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; /* Map an error number to an error message */
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;
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.export _strerror
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.import __sys_errlist
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.include "errno.inc"
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_strerror:
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cpx #$00 ; High byte must be zero
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bne @L1 ; Jump if invalid error
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cmp #EMAX ; Valid error code (map EUNKNOWN to 0)?
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bcc @L2 ; Jump if ok
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; The given error code is invalid
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@L1: lda #<EINVAL
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sta __errno
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lda #>EINVAL ; = 0
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sta __errno+1
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; lda #$00 ; A contains zero: "Unknown error"
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; Load the pointer to the error message and return
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@L2: asl a ; * 2
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tay
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ldx __sys_errlist+1,y
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lda __sys_errlist,y
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rts
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