1 files changed, 10 insertions, 14 deletions

diff --git a/avr/eval_arg.c b/avr/eval_arg.c
index 020dd98..b931509 100644
--- a/avr/eval_arg.c
+++ b/avr/eval_arg.c
@@ -38,7 +38,7 @@ static void next(void)
 {
 	do
 		ch = *bp++;
-	while (ch == ' ' || ch == '\n');
+	while (isspace(ch));
 }
 
 static long number (void)
@@ -76,10 +76,15 @@ static long factor (void)
 			next();
 		else
 			error ();
+	} else {
+		char sign = ch;
+		if (sign == '+' || sign == '-') {
+			next();
+		}
+		f = number();
+		if (sign == '-')
+			f = -f;
 	}
-	else
-		f = number ();
-
 	return f;
 }
 
@@ -109,16 +114,7 @@ static long term (void)
 
 static long expr(void)
 {
-	long e;
-
-	if (ch == '+') {
-		next();
-		e = term ();
-	} else if (ch == '-') {
-		next();
-		e = - term ();
-	} else
-		e = term ();
+	long e = term ();
 
 	while (ch == '+' || ch == '-') {
 		char op = ch;