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159 lines
2.9 KiB
ArmAsm
159 lines
2.9 KiB
ArmAsm
;
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; int vfprintf (FILE* f, const char* Format, va_list ap);
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;
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; Ullrich von Bassewitz, 1.12.2000
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;
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.export _vfprintf
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.import pushax, popax, push1
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.import _fwrite, __printf
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.importzp sp, ptr1, ptr2
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.macpack generic
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.data
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; ----------------------------------------------------------------------------
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;
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; Static data for the _vfprintf routine
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;
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outdesc: ; Static outdesc structure
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.word 0 ; ccount
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.word out ; Output function pointer
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.word 0 ; ptr
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.word 0 ; uns
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.code
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; ----------------------------------------------------------------------------
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; Callback routine used for the actual output.
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;
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; static void out (struct outdesc* d, const char* buf, unsigned count)
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; /* Routine used for writing */
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; {
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; /* Write to the file */
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; if (fwrite (buf, count, 1, (FILE*) d->ptr) == -1) {
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; d->ccount = -1;
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; } else {
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; d->ccount += count;
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; }
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; }
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out:
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; About to call
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;
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; fwrite (buf, count, 1, (FILE*) d->ptr);
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;
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; Since Buf and Count are already in place, we will just push the last
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; two parameters. The fwrite function will remove Buf and Count on exit.
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jsr push1
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ldy #7 ; Offset of D+1 on stack
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lda (sp),y
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sta ptr1+1
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dey ; Offset of D on stack (6)
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lda (sp),y
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sta ptr1
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dey ; Offset of ptr+1 in struct outdesc (5)
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lda (ptr1),y
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tax
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dey
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lda (ptr1),y
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jsr pushax ; Push D->ptr
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jsr _fwrite
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sta ptr2 ; Save function result
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stx ptr2+1
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; Pop the last parameter from stack and store it in ptr1. This means that
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; the stack is clean now.
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jsr popax
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sta ptr1
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stx ptr1+1
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; Load the offset of ccount in struct outdesc
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ldy #$00
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; Check the return code. Checking the hig byte against $FF is ok here.
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lda ptr2+1
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cmp #$FF
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bne @Ok
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; We had an error. Store -1 into d->ccount
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sta (ptr1),y
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iny
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sta (ptr1),y
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rts
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; Result was ok, count bytes written
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@Ok: lda (ptr1),y
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add ptr1
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sta (ptr1),y
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iny
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lda (ptr1),y
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adc ptr1+1
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sta (ptr1),y
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rts
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; ----------------------------------------------------------------------------
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; vfprintf - formatted output
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;
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; int vfprintf (FILE* f, const char* format, va_list ap)
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; {
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; struct outdesc d;
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;
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; /* Setup descriptor */
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; d.fout = out;
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; d.ptr = f;
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;
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; /* Do formatting and output */
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; _printf (&d, format, ap);
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;
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; /* Return bytes written */
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; return d.ccount;
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; }
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_vfprintf:
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pha ; Save low byte of ap
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; Setup the outdesc structure
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lda #0
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sta outdesc
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sta outdesc+1 ; Clear ccount
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; Reorder the stack. Replace f on the stack by &d, so the stack frame is
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; exactly as _printf expects it. Parameters will get dropped by _printf.
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ldy #2 ;
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lda (sp),y ; Low byte of f
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sta outdesc+4 ;
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lda #<outdesc
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sta (sp),y
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iny
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lda (sp),y ; High byte of f
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sta outdesc+5
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lda #>outdesc
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sta (sp),y
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; Restore low byte of ap and call _printf
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pla
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jsr __printf
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; Return the number of bytes written
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lda outdesc
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ldx outdesc+1
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rts
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