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62 lines
1.5 KiB
ArmAsm
62 lines
1.5 KiB
ArmAsm
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; Ullrich von Bassewitz, 17.07.2002
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; const char* __fastcall__ _stroserror (unsigned char errcode);
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; /* Map an operating system error number to an error message. */
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;
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.export __stroserror
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.import __sys_oserrlist
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.importzp ptr1, tmp1
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.macpack generic
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; The table is built as a list of entries
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;
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; .byte entrylen
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; .byte errorcode
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; .asciiz errormsg
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;
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; and terminated by an entry with length zero that is returned if the
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; error code could not be found.
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__stroserror:
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sta tmp1 ; Save the error code
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ldy #<__sys_oserrlist
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sty ptr1
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ldy #>__sys_oserrlist
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sty ptr1+1 ; Setup pointer to message table
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@L1: ldy #0
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lda (ptr1),y ; Get the length
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beq Done ; Bail out if end of list reached
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iny
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lda (ptr1),y ; Compare the error code
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cmp tmp1
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beq Done ; Jump if found
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; Not found, move pointer to next entry
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dey
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clc
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lda ptr1
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adc (ptr1),y
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sta ptr1
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bcc @L1
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inc ptr1+1
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bcs @L1 ; Branch always
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; We've found the code or reached the end of the list
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Done: ldx ptr1+1
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lda ptr1
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add #2 ; Add a total of #2
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bcc @L1
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inx ; Bump high byte
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@L1: rts
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