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38 lines
972 B
ArmAsm
38 lines
972 B
ArmAsm
;
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; int __fastcall__ vsprintf (char* Buf, const char* Format, va_list ap);
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;
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; Ullrich von Bassewitz, 2009-09-26
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;
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.export _vsprintf
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.import pushw0sp, staxysp
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.import vsnprintf
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; ----------------------------------------------------------------------------
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; vsprintf - formatted output into a buffer
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;
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; int __fastcall__ vsprintf (char* buf, const char* format, va_list ap);
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;
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_vsprintf:
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pha ; Save low byte of ap
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txa
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pha ; Save high byte of op
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; Build a stackframe for vsnprintf. To do that, we move format one word down,
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; and store 0x7FFF (INT_MAX) as size.
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jsr pushw0sp ; Get format and push it
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lda #$FF
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ldx #$7F ; INT_MAX
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ldy #2
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jsr staxysp
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; Contine by jumping to vsnprintf, which expects ap on the CPU stack and will
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; cleanup the C stack
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jmp vsnprintf
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