diff --git a/ase/awk/makefile.sco b/ase/awk/makefile.sco
index 6729a81b..16a83d6d 100644
--- a/ase/awk/makefile.sco
+++ b/ase/awk/makefile.sco
@@ -3,7 +3,7 @@ OBJS = $(SRCS:.c=.o)
 OUT = libxpawk.a
 
 CC = cc
-CFLAGS = -Xc -a ansi -O2 -I../.. -D__STAND_ALONE
+CFLAGS = -Xc -a ansi -w3 -O2 -I../.. -D__STAND_ALONE
 
 all: $(OBJS)
 	ar cr $(OUT) $(OBJS)
diff --git a/ase/awk/parse.c b/ase/awk/parse.c
index 8c743988..f2d0ab2c 100644
--- a/ase/awk/parse.c
+++ b/ase/awk/parse.c
@@ -1,5 +1,5 @@
 /*
- * $Id: parse.c,v 1.80 2006-04-14 10:56:42 bacon Exp $
+ * $Id: parse.c,v 1.81 2006-04-14 16:26:00 bacon Exp $
  */
 
 #include <xp/awk/awk_i.h>
@@ -92,12 +92,6 @@ enum
 	__TOKEN_COUNT__
 };
 
-#if defined(__BORLANDC__) || defined(_MSC_VER)
-	#define INLINE 
-#else
-	#define INLINE inline
-#endif
-
 typedef struct __binmap_t __binmap_t;
 
 struct __binmap_t
@@ -165,6 +159,7 @@ static int __unget_char (xp_awk_t* awk, xp_cint_t c);
 static int __skip_spaces (xp_awk_t* awk);
 static int __skip_comment (xp_awk_t* awk);
 static int __classify_ident (xp_awk_t* awk, const xp_char_t* ident);
+static int __assign_to_opcode (xp_awk_t* awk);
 
 struct __kwent 
 { 
@@ -227,13 +222,15 @@ do { \
 } while (0)
 
 #define GET_TOKEN(awk) \
-	do { if (__get_token(awk) == -1) return -1; } while(0)
+	do { if (__get_token(awk) == -1) return -1; } while (0)
 
 #define MATCH(awk,token_type) ((awk)->token.type == (token_type))
-#define CONSUME(awk) \
-	do { if (__get_token(awk) == -1) return XP_NULL; } while(0)
 
-#define PANIC(awk,code) do { (awk)->errnum = (code);  return XP_NULL; } while (0);
+#define CONSUME(awk) \
+	do { if (__get_token(awk) == -1) return XP_NULL; } while (0)
+
+#define PANIC(awk,code) \
+	do { (awk)->errnum = (code); return XP_NULL; } while (0)
 
 /* TODO: remove stdio.h */
 #ifndef __STAND_ALONE
@@ -1017,12 +1014,14 @@ static xp_awk_nde_t* __parse_expression (xp_awk_t* awk)
 
 	xp_awk_nde_t* x, * y;
 	xp_awk_nde_ass_t* nde;
+	int opcode;
 
 	x = __parse_basic_expr (awk);
 	if (x == XP_NULL) return XP_NULL;
-	if (!MATCH(awk,TOKEN_ASSIGN)) return x;
 
-/*TODO: PLUS_ASSIGN, MINUS_ASSIGN, .... */
+	opcode = __assign_to_opcode (awk);
+	if (opcode == -1) return x;
+
 	xp_assert (x->next == XP_NULL);
 	if (x->type != XP_AWK_NDE_ARG &&
 	    x->type != XP_AWK_NDE_ARGIDX &&
@@ -1061,6 +1060,7 @@ static xp_awk_nde_t* __parse_expression (xp_awk_t* awk)
 
 	nde->type = XP_AWK_NDE_ASS;
 	nde->next = XP_NULL;
+	nde->opcode = opcode;
 	nde->left = x;
 	nde->right = y;
 
@@ -2847,3 +2847,15 @@ static int __classify_ident (xp_awk_t* awk, const xp_char_t* ident)
 	return TOKEN_IDENT;
 }
 
+static int __assign_to_opcode (xp_awk_t* awk)
+{
+	if (MATCH(awk,TOKEN_ASSIGN)) return XP_AWK_ASSOP_NONE;
+	if (MATCH(awk,TOKEN_PLUS_ASSIGN)) return XP_AWK_ASSOP_PLUS;
+	if (MATCH(awk,TOKEN_MINUS_ASSIGN)) return XP_AWK_ASSOP_MINUS;
+	if (MATCH(awk,TOKEN_MUL_ASSIGN)) return XP_AWK_ASSOP_MUL;
+	if (MATCH(awk,TOKEN_DIV_ASSIGN)) return XP_AWK_ASSOP_DIV;
+	if (MATCH(awk,TOKEN_MOD_ASSIGN)) return XP_AWK_ASSOP_MOD;
+	if (MATCH(awk,TOKEN_EXP_ASSIGN)) return XP_AWK_ASSOP_EXP;
+
+	return -1;
+}
diff --git a/ase/awk/run.c b/ase/awk/run.c
index ccc03907..e28deef9 100644
--- a/ase/awk/run.c
+++ b/ase/awk/run.c
@@ -1,5 +1,5 @@
 /*
- * $Id: run.c,v 1.48 2006-04-14 10:56:42 bacon Exp $
+ * $Id: run.c,v 1.49 2006-04-14 16:26:00 bacon Exp $
  */
 
 #include <xp/awk/awk_i.h>
@@ -30,9 +30,9 @@
 #define EXIT_GLOBAL    4
 
 #define PANIC(awk,code) \
-	do { (awk)->errnum = (code);  return XP_NULL; } while (0)
+	do { (awk)->errnum = (code); return XP_NULL; } while (0)
 #define PANIC_I(awk,code) \
-	do { (awk)->errnum = (code);  return -1; } while (0)
+	do { (awk)->errnum = (code); return -1; } while (0)
 
 static int __run_block (xp_awk_t* awk, xp_awk_nde_blk_t* nde);
 static int __run_statement (xp_awk_t* awk, xp_awk_nde_t* nde);
@@ -680,6 +680,7 @@ static xp_awk_val_t* __eval_assignment (xp_awk_t* awk, xp_awk_nde_t* nde)
 	val = __eval_expression(awk, ass->right);
 	if (val == XP_NULL) return XP_NULL;
 
+/*TODO: ass->opcode....*/
 	return __do_assignment (awk, (xp_awk_nde_var_t*)ass->left, val);
 }
 
diff --git a/ase/awk/run.h b/ase/awk/run.h
index caeda55c..afd6b3ce 100644
--- a/ase/awk/run.h
+++ b/ase/awk/run.h
@@ -1,5 +1,5 @@
 /*
- * $Id: run.h,v 1.8 2006-04-12 03:54:12 bacon Exp $
+ * $Id: run.h,v 1.9 2006-04-14 16:26:00 bacon Exp $
  */
 
 #ifndef _XP_AWK_RUN_H_
@@ -19,6 +19,18 @@ struct xp_awk_frm_t
 	xp_awk_frm_t* prev;
 };
 
+enum
+{
+	/* if you change this, you have to change __assop_str in tree.c */
+	XP_AWK_ASSOP_NONE,
+	XP_AWK_ASSOP_PLUS,
+	XP_AWK_ASSOP_MINUS,
+	XP_AWK_ASSOP_MUL,
+	XP_AWK_ASSOP_DIV,
+	XP_AWK_ASSOP_MOD,
+	XP_AWK_ASSOP_EXP
+};
+
 enum 
 {
 	/* if you change this, you have to change 
diff --git a/ase/awk/tree.c b/ase/awk/tree.c
index bbaf311d..ebf32be0 100644
--- a/ase/awk/tree.c
+++ b/ase/awk/tree.c
@@ -1,5 +1,5 @@
 /*
- * $Id: tree.c,v 1.36 2006-04-14 10:56:42 bacon Exp $
+ * $Id: tree.c,v 1.37 2006-04-14 16:26:00 bacon Exp $
  */
 
 #include <xp/awk/awk_i.h>
@@ -10,6 +10,17 @@
 #include <xp/bas/stdio.h>
 #endif
 
+static const xp_char_t* __assop_str[] =
+{
+	XP_TEXT("="),
+	XP_TEXT("+="),
+	XP_TEXT("-="),
+	XP_TEXT("*="),
+	XP_TEXT("/="),
+	XP_TEXT("%="),
+	XP_TEXT("**=")
+};
+
 static const xp_char_t* __binop_str[] =
 {
 	XP_TEXT("||"),
@@ -37,7 +48,6 @@ static const xp_char_t* __binop_str[] =
 
 	XP_TEXT("~"),
 	XP_TEXT("!~")
-
 };
 
 static const xp_char_t* __unrop_str[] =
@@ -72,7 +82,8 @@ static int __print_expression (xp_awk_nde_t* nde)
 	switch (nde->type) {
 	case XP_AWK_NDE_ASS:
 		if (__print_expression (((xp_awk_nde_ass_t*)nde)->left) == -1) return -1;
-		xp_printf (XP_TEXT(" = "));
+		xp_printf (XP_TEXT(" %s "), 
+			__assop_str[((xp_awk_nde_exp_t*)nde)->opcode]);
 		if (__print_expression (((xp_awk_nde_ass_t*)nde)->right) == -1) return -1;
 		xp_assert ((((xp_awk_nde_ass_t*)nde)->right)->next == XP_NULL);
 		break;
diff --git a/ase/awk/tree.h b/ase/awk/tree.h
index 31c1f0d2..223363b7 100644
--- a/ase/awk/tree.h
+++ b/ase/awk/tree.h
@@ -1,5 +1,5 @@
 /*
- * $Id: tree.h,v 1.32 2006-04-14 10:56:42 bacon Exp $
+ * $Id: tree.h,v 1.33 2006-04-14 16:26:00 bacon Exp $
  */
 
 #ifndef _XP_AWK_TREE_H_
@@ -27,6 +27,10 @@ enum
 	XP_AWK_NDE_NEXTFILE,
 
 	/* expression */
+
+	/* if you change the following values including their order,
+	 * you should change __eval_func of __eval_expression 
+	 * in run.c accordingly */
 	XP_AWK_NDE_ASS,
 	XP_AWK_NDE_EXP_BIN,
 	XP_AWK_NDE_EXP_UNR,
@@ -100,6 +104,7 @@ struct xp_awk_nde_blk_t
 struct xp_awk_nde_ass_t
 {
 	XP_AWK_NDE_HDR;
+	int opcode;
 	xp_awk_nde_t* left;
 	xp_awk_nde_t* right;
 };
diff --git a/ase/test/awk/awk.c b/ase/test/awk/awk.c
index 2b58b7a8..aad8fa9d 100644
--- a/ase/test/awk/awk.c
+++ b/ase/test/awk/awk.c
@@ -1,5 +1,5 @@
 /*
- * $Id: awk.c,v 1.21 2006-04-14 11:14:58 bacon Exp $
+ * $Id: awk.c,v 1.22 2006-04-14 16:26:00 bacon Exp $
  */
 
 #include <xp/awk/awk.h>
@@ -90,18 +90,30 @@ int xp_main (int argc, xp_char_t* argv[])
 
 	if (xp_awk_parse(awk) == -1) 
 	{
+#if defined(_SCO_DS) && defined(XP_CHAR_IS_WCHAR)
+		xp_printf (
+			XP_TEXT("error: cannot parse program - [%d] %ls\n"), 
+			xp_awk_geterrnum(awk), xp_awk_geterrstr(awk));
+#else
 		xp_printf (
 			XP_TEXT("error: cannot parse program - [%d] %s\n"), 
 			xp_awk_geterrnum(awk), xp_awk_geterrstr(awk));
+#endif
 		xp_awk_close (awk);
 		return -1;
 	}
 
 	if (xp_awk_run(awk) == -1) 
 	{
+#if defined(_SCO_DS) && defined(XP_CHAR_IS_WCHAR)
+		xp_printf (
+			XP_TEXT("error: cannot run program - [%d] %ls\n"), 
+			xp_awk_geterrnum(awk), xp_awk_geterrstr(awk));
+#else
 		xp_printf (
 			XP_TEXT("error: cannot run program - [%d] %s\n"), 
 			xp_awk_geterrnum(awk), xp_awk_geterrstr(awk));
+#endif
 		xp_awk_close (awk);
 		return -1;
 	}