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82 lines
1.9 KiB
ArmAsm
82 lines
1.9 KiB
ArmAsm
;
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; int fscanf (FILE* f, const char* format, ...);
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;
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; Ullrich von Bassewitz, 2004-11-28
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;
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.export _fscanf
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.import addysp, decsp4, _vfscanf
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.importzp sp, ptr1
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.macpack generic
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; ----------------------------------------------------------------------------
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; Data
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.bss
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ParamSize: .res 1 ; Number of parameter bytes
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; ----------------------------------------------------------------------------
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; int fscanf (FILE* f, const char* format, ...)
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; /* Standard C function */
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; {
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; va_list ap;
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;
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; /* Setup for variable arguments */
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; va_start (ap, format);
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;
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; /* Call vfscanf(). Since we know that va_end won't do anything, we will
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; ** save the call and return the value directly.
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; */
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; return vfscanf (f, format, ap);
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; }
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;
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.code
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_fscanf:
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sty ParamSize ; Number of param bytes passed in Y
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; We have to push f and format, both in the order they already have on stack.
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; To make this somewhat more efficient, we will create space on the stack and
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; then do a copy of the complete block instead of pushing each parameter
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; separately. Since the size of the arguments passed is the same as the size
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; of the fixed arguments, this will allow us to calculate the pointer to the
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; fixed size arguments easier (they're just ParamSize bytes away).
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jsr decsp4
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; Calculate a pointer to the Format argument
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lda ParamSize
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add sp
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sta ptr1
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ldx sp+1
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bcc @L1
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inx
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@L1: stx ptr1+1
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; Now copy both, f and format
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ldy #4-1
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@L2: lda (ptr1),y
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sta (sp),y
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dey
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bpl @L2
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; Load va_list (last and __fastcall__ parameter to vfscanf)
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lda ptr1
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ldx ptr1+1
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; Call vfscanf
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jsr _vfscanf
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; Cleanup the stack. We will return what we got from vfscanf
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ldy ParamSize
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jmp addysp
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