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99 lines
2.5 KiB
ArmAsm
99 lines
2.5 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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; 2004-11-27, Ullrich von Bassewitz
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; 2004-12-21, Greg King
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;
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.export _vfscanf
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.import _fgetc, _ungetc, _ferror
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.include "zeropage.inc"
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.include "_scanf.inc"
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.include "stdio.inc"
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count := ptr3 ; Result of scan
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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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; /* Initialize the data struct. We do only need the given file as user data,
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; ** because the (getfunc) and (ungetfunc) functions are crafted so that they
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; ** match the standard-I/O fgetc() and ungetc().
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; */
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; static struct scanfdata d = {
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; ( getfunc) fgetc,
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; (ungetfunc) ungetc
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; };
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; static int count;
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;
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; d.data = (void*) f;
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;
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; /* Call the internal function */
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; count = _scanf (&d, format, ap);
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;
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; /* And, return the result */
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; return ferror (f) ? EOF : count;
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; }
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;
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; Because _scanf() has the same parameter stack as vfscanf(), with f replaced
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; by &d, we will do exactly that. _scanf() then will clean up the stack.
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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 call the _scanf function
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pla
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jsr __scanf
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sta count
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stx count+1
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; Return -1 if there was a read error during the scan
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lda d + SCANFDATA::DATA ; Get f
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ldx d + SCANFDATA::DATA+1
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jsr _ferror
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tay
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beq L1
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lda #<EOF
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tax
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rts
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; Or, return the result of the scan
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L1: lda count
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ldx count+1
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rts
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