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Only the function that actually is needed will be linked. It is very useful for targets that do not have file-system I/O.
34 lines
1.1 KiB
ArmAsm
34 lines
1.1 KiB
ArmAsm
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; 2003-08-12, Ullrich von Bassewitz
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; 2015-09-24, Greg King
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; Helper function for several high-level file functions.
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;
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.include "errno.inc"
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.macpack generic
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.macpack cpu
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; ----------------------------------------------------------------------------
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; int __fastcall__ _mappederrno (unsigned char code);
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; /* Set _oserror to the given platform-specific error code. If it is a real
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; ** error code (not zero), set errno to the corresponding system error code,
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; ** and return -1. Otherwise, return zero.
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; ** Used by the library.
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; */
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__mappederrno:
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sta __oserror ; Store the error code
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tax ; Did we have an error?
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bze ok ; Branch if no
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jsr __osmaperrno ; Map OS error into errno code
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jsr __seterrno ; Save in errno (returns with .A = 0)
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.if (.cpu .bitand CPU_ISET_65SC02)
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dec a
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.else
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lda #$FF ; Return -1 if error
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.endif
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tax
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ok: rts
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