Rewrote vprintf in assembler and made it __fastcall__

git-svn-id: svn://svn.cc65.org/cc65/trunk@2186 b7a2c559-68d2-44c3-8de9-860c34a00d81
2003-06-02 16:08:26 +00:00
parent e60b68c7bd
commit 7b3f6f9369
5 changed files with 54 additions and 24 deletions
--- a/libsrc/common/vprintf.s
+++ b/libsrc/common/vprintf.s
@@ -0,0 +1,51 @@
+;
+; Ullrich von Bassewitz, 2003-06-02
+;
+; int __fastcall__ vprintf (const char* format, va_list ap);
+;
+
+  	.export		_vprintf
+        .import         _vfprintf, _stdout
+  	.import		decsp2
+  	.importzp	sp
+
+
+.proc   _vprintf
+
+; Save A which contains the low part of ap
+
+        pha
+
+; Allocate one more word on the stack
+
+        jsr     decsp2
+
+; Move the format parameter down and store stdout in it's place
+
+        ldy     #2
+        lda     (sp),y
+        ldy     #0
+        sta     (sp),y
+        ldy     #3
+        lda     (sp),y
+        ldy     #1
+        sta     (sp),y
+
+        iny
+        lda     _stdout
+        sta     (sp),y
+        iny
+        lda     _stdout+1
+        sta     (sp),y
+
+; Restore A
+
+        pla
+
+; Call vfprintf (stdout, format, ap) which will cleanup the stack and return
+
+        jmp     _vfprintf
+
+.endproc
+
+