From b46dab6d4498cc1084905a386203868f44e05bd1 Mon Sep 17 00:00:00 2001
From: cuz <cuz@b7a2c559-68d2-44c3-8de9-860c34a00d81>
Date: Fri, 1 Dec 2000 17:32:59 +0000
Subject: [PATCH] Rewrote sprintf() in assembler

git-svn-id: svn://svn.cc65.org/cc65/trunk@514 b7a2c559-68d2-44c3-8de9-860c34a00d81
---
 libsrc/common/.cvsignore |  1 -
 libsrc/common/Makefile   | 13 ++++----
 libsrc/common/fprintf.s  |  2 +-
 libsrc/common/sprintf.c  | 26 ---------------
 libsrc/common/sprintf.s  | 71 ++++++++++++++++++++++++++++++++++++++++
 5 files changed, 79 insertions(+), 34 deletions(-)
 delete mode 100644 libsrc/common/sprintf.c
 create mode 100644 libsrc/common/sprintf.s

diff --git a/libsrc/common/.cvsignore b/libsrc/common/.cvsignore
index 1ebdbe1d6..44c6fff60 100644
--- a/libsrc/common/.cvsignore
+++ b/libsrc/common/.cvsignore
@@ -29,7 +29,6 @@ puts.s
 qsort.s
 realloc.s
 rewind.s
-sprintf.s
 strtok.s
 strxfrm.s
 vcprintf.s
diff --git a/libsrc/common/Makefile b/libsrc/common/Makefile
index a5e668664..dbfaf4248 100644
--- a/libsrc/common/Makefile
+++ b/libsrc/common/Makefile
@@ -15,7 +15,7 @@ C_OBJS = fclose.o fgets.o calloc.o _fopen.o\
 	 fputs.o fread.o fwrite.o gets.o realloc.o bsearch.o strxfrm.o\
 	 _hextab.o fdopen.o strtok.o\
 	 _afailed.o fopen.o fgetc.o fputc.o puts.o gets.o perror.o getchar.o\
-	 vprintf.o vsprintf.o sprintf.o abort.o qsort.o putchar.o\
+	 vprintf.o vsprintf.o abort.o qsort.o putchar.o\
 	 errormsg.o vcprintf.o freopen.o locale.o fsetpos.o\
 	 fgetpos.o rewind.o fseek.o ftell.o
 
@@ -58,11 +58,12 @@ S_OBJS = 	_fdesc.o	\
 		maperrno.o  	\
 		memchr.o    	\
 		memcmp.o    	\
-	 	memcpy.o    	\
-	 	memset.o    	\
-		printf.o	\
-	 	rand.o	    	\
-	 	setjmp.o    	\
+	 	memcpy.o      	\
+	 	memset.o      	\
+		printf.o      	\
+	 	rand.o	      	\
+	 	setjmp.o      	\
+		sprintf.o	\
 		stkcheck.o  	\
 		strcat.o    	\
 		strchr.o	\
diff --git a/libsrc/common/fprintf.s b/libsrc/common/fprintf.s
index 318f68576..47bff6b30 100644
--- a/libsrc/common/fprintf.s
+++ b/libsrc/common/fprintf.s
@@ -1,5 +1,5 @@
 ;
-; int printf (const char* Format, ...);
+; int fprintf (FILE* f, const char* Format, ...);
 ;
 ; Ullrich von Bassewitz, 1.12.2000
 ;
diff --git a/libsrc/common/sprintf.c b/libsrc/common/sprintf.c
deleted file mode 100644
index 15c028fbf..000000000
--- a/libsrc/common/sprintf.c
+++ /dev/null
@@ -1,26 +0,0 @@
-/*
- * sprintf.c
- *
- * Ullrich von Bassewitz, 11.08.1998
- */
-
-
-
-#include <stdarg.h>
-#include <stdio.h>
-
-
-
-int sprintf (char* /*buf*/, const char* format, ...)
-{
-    va_list ap;
-    va_start (ap, format);
-
-    /* Do formatting and output. Since we know, that va_end is empty, we don't
-     * call it here, saving an extra variable and some code.
-     */
-    return vsprintf ((char*) va_fix (ap, 1), (char*) va_fix (ap, 2), ap);
-}
-
-
-
diff --git a/libsrc/common/sprintf.s b/libsrc/common/sprintf.s
new file mode 100644
index 000000000..6a1a29c4b
--- /dev/null
+++ b/libsrc/common/sprintf.s
@@ -0,0 +1,71 @@
+;
+; int sprintf (char* buf, const char* Format, ...);
+;
+; Ullrich von Bassewitz, 1.12.2000
+;
+
+	.export	      	_sprintf
+	.import		pushax, addysp, subysp, _vsprintf
+	.importzp	sp, ptr1
+
+	.macpack	generic
+
+; ----------------------------------------------------------------------------
+; Data
+
+.bss
+
+ParamSize: 	.res  	1 		; Number of parameter bytes
+
+; ----------------------------------------------------------------------------
+; Code
+
+.code
+
+
+_sprintf:
+  	sty	ParamSize 		; Number of param bytes passed in Y
+
+; We have to push buf and format, both in the order they already have on stack.
+; To make this somewhat more efficient, we will create space on the stack and
+; the do a copy of the complete block instead of pushing each parameter
+; separately. Since the size of the arguments passed is the same as the size
+; of the fixed arguments, this will allow us to calculate the pointer to the
+; fixed size arguments easier (they're just ParamSize bytes away).
+
+	ldy	#4
+	jsr	subysp
+
+; Calculate a pointer to the Format argument
+
+	lda	ParamSize
+	add	sp
+	sta	ptr1
+	ldx	sp+1
+	bcc	@L1
+	inx
+@L1:	stx	ptr1+1
+
+; Now copy both, buf and format
+
+	ldy	#4-1
+@L2:	lda	(ptr1),y
+	sta	(sp),y
+	dey
+	bpl	@L2
+
+; Push va_list (last parameter to vsprintf)
+
+	lda    	ptr1
+	ldx    	ptr1+1
+	jsr	pushax
+
+; Call vfprintf
+
+	jsr	_vsprintf
+
+; Cleanup the stack. We will return what we got from vsprintf
+
+	ldy	ParamSize
+	jmp	addysp
+