From f3181636d06af22d4828b4256c2a62d025fccb8a Mon Sep 17 00:00:00 2001
From: Andreas Baumann <mail@andreasbaumann.cc>
Date: Sun, 26 Sep 2021 20:40:20 +0200
Subject: cc: cleanup putint and also zeroing print buffer

---
 miniany/cc.c    | 69 +++++++--------------------------------------------------
 miniany/test1.c |  3 +++
 2 files changed, 11 insertions(+), 61 deletions(-)

diff --git a/miniany/cc.c b/miniany/cc.c
index acba6df..6f4f0a8 100644
--- a/miniany/cc.c
+++ b/miniany/cc.c
@@ -802,9 +802,15 @@ void genPrologue( struct Compiler *compiler )
 	putstring( "org $1000000" ); putnl( );
 	putstring( "jmp _start" ); putnl( );	
 	putstring( "putint:" ); putnl( );
-	putstring( "mov esi, 0xa" ); putnl( );
+	putstring( "mov esi, 0" ); putnl( );
 	putstring( "lea edi, [putint_string_fmt]" ); putnl( );
-	putstring( "add edi, 9" ); putnl( );
+	putstring( "itoa_init:" ); putnl( );
+	putstring( "mov byte [edi], 0x20" ); putnl( );
+	putstring( "inc edi"); putnl( );
+	putstring( "inc esi"); putnl( );	
+	putstring( "cmp esi, 9" ); putnl( );
+	putstring( "jne itoa_init" ); putnl( );
+	putstring( "inc esi"); putnl( );	
 	putstring( "itoa_loop:" ); putnl( );
 	putstring( "mov edx, 0" ); putnl( );
 	putstring( "div esi" ); putnl( );
@@ -815,70 +821,11 @@ void genPrologue( struct Compiler *compiler )
 	putstring( "jnz itoa_loop" ); putnl( );
 	putstring( "mov eax, 4" ); putnl( );
 	putstring( "mov ebx, 1" ); putnl( );
-	/* TODO: itoa in assembly (yuck!) and print resulting string */
 	putstring( "mov ecx, putint_string_fmt" ); putnl( );
-	/* TODO: compute length with a assemble time function sizeof or so.. */
 	putstring( "mov edx, 11" ); putnl( );
 	putstring( "int 0x80" ); putnl( );
 	putstring( "ret" ); putnl( );
 	putstring( "_start:" ); putnl( );
-
-/*
-
-fmt: .string "%s\n"
-
-.lcomm converted, 10
-
-
-	.section .text
-
-.global _start
-
-_start:
-
-	xorl %ecx, %ecx
-	xorl %edi, %edi
-	movl $NUMBER, %eax
-
-itoa_loop:
-	# Limpa para divisão
-	xorl %edx, %edx
-	
-	movl $10, %esi
-	
-	# Agora nós temos o quociente em %eax
-	# e o resto da divisão em %edx
-	idiv %esi
-		
-	# Convertendo para a representação em ASCII
-	addl $48, %edx
-	
-	pushl %edx
-	incl %ecx
-	
-	xorl $0, %eax
-	jnz itoa_loop
-
-rev_loop:
-	popl %eax
-	movl %eax, converted(, %edi, 1)
-	incl %edi
-	decl %ecx
-
-	cmpl $0, %ecx	
-	jnz rev_loop
-	
-	pusha	
-	pushl $converted
-	pushl $fmt
-	call printf
-	addl $8, %esp	
-	popa
-
-	# Exiting
-	movl $1, %eax
-	int $0x80
- */
 }
 
 void genEpilogue( struct Compiler *compiler )
diff --git a/miniany/test1.c b/miniany/test1.c
index 707ff16..1bfb8cf 100644
--- a/miniany/test1.c
+++ b/miniany/test1.c
@@ -2,8 +2,11 @@
 
 int i;
 int j;
+int k;
 
 i = 12+25/5-2*3; // 25/5 -> 5, 12+5 -> 17, 2*3 -> 6, 17-6 -> 11
 putint i;
 j = i/3+3*4; // 11 / 3 -> 3, 3*4 -> 12, 3+12 -> 15 
 putint j;
+k = 0;
+putint k;
-- 
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