modernize bigsub()

1 files changed, 13 insertions, 11 deletions

diff --git a/big.c b/big.c
index f791b4d..c35ce99 100644
--- a/big.c
+++ b/big.c
@@ -155,18 +155,20 @@ word big_plus(word x, word y, int signbit)
   return r;
 }
 
-word bigsub(x, y)
-word x, y;
+word bigsub(word x, word y)
 {
-  if (big_is_positive(x))
-    if (big_is_positive(y))
-      return (big_sub(x, y));
-    else
-      return (big_plus(x, y, 0));	/* big_is_positive x, negative y */
-  else if (big_is_positive(y))
-    return (big_plus(x, y, SIGNBIT));	/* negative x, big_is_positive y */
-  else
-    return (big_sub(y, x));	/* both negative */
+  if (big_is_positive(x)) {
+    if (big_is_positive(y)) {
+      return (big_sub(x, y));		/* both positive */
+    }
+    return (big_plus(x, y, 0));		/* positive x, negative y */
+  }
+
+  if (big_is_positive(y)) {
+    return (big_plus(x, y, SIGNBIT));	/* negative x, positive y */
+  }
+
+  return (big_sub(y, x));	/* both negative */
 }
 
 word big_sub(x, y)		/* ignore input signs, treat x,y as positive */