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71 lines
1.9 KiB
ArmAsm
71 lines
1.9 KiB
ArmAsm
;
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; int __fastcall__ vfscanf (FILE* f, const char* format, va_list ap);
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;
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; Ullrich von Bassewitz, 2004-11-27
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;
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.export _vfscanf
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.import _fgetc, _ungetc
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.include "zeropage.inc"
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.include "_scanf.inc"
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; ----------------------------------------------------------------------------
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; Static scanfdata structure for the _vfscanf routine
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;
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.data
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d: .addr _fgetc ; GET
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.addr _ungetc ; UNGET
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.addr 0 ; data
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; ----------------------------------------------------------------------------
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; int __fastcall__ vfscanf (FILE* f, const char* format, va_list ap)
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; /* Standard C function */
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; {
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; struct scanfdata d;
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;
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; /* Initialize the data struct. We do only need the given file as user data,
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; * since the get and ungetc are crafted so they match the standard fgetc
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; * and ungetc functions.
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; */
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; d.get = (getfunc) fgetc,
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; d.unget = (ungetfunc) ungetc,
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; d.data = f;
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;
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; /* Call the internal function and return the result */
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; return _scanf (&d, format, ap);
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; }
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;
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; Since _scanf has the same parameter stack as vfscanf, with f replaced by &d,
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; we will do exactly that. _scanf will then clean up the stack, so we can jump
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; directly there, no need to return.
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; Beware: Since ap is a fastcall parameter, we must not destroy a/x.
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;
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.code
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_vfscanf:
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pha ; Save low byte of ap
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; Swap f against &d on the stack, placing f into d.data
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ldy #2 ; Offset of f on the stack
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lda (sp),y
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sta d + SCANFDATA::DATA
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lda #<d
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sta (sp),y
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iny ; High byte
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lda (sp),y
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sta d + SCANFDATA::DATA + 1
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lda #>d
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sta (sp),y
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; Restore the low byte of ap and jump to the _scanf function
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pla
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jmp __scanf
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