Use smallest local variable scope in GetVpValueWithPrec

Author: mrkn

ext/bigdecimal/bigdecimal.c

@@ -205,10 +205,7 @@ static VALUE rb_rational_convert_to_BigDecimal(VALUE val, size_t digs, int raise
 static Real*
 GetVpValueWithPrec(VALUE v, long prec, int must)
 {
-    ENTER(1);
     Real *pv;
-    VALUE bg;
-    char szD[128];
 
     switch(TYPE(v)) {
       case T_FLOAT: {
@@ -233,9 +230,11 @@ GetVpValueWithPrec(VALUE v, long prec, int must)
 	}
 	break;
 
-      case T_FIXNUM:
+      case T_FIXNUM: {
+        char szD[128];
 	sprintf(szD, "%ld", FIX2LONG(v));
         return VpCreateRbObject(VpBaseFig() * 2 + 1, szD, true);
+      }
 
 #ifdef ENABLE_NUMERIC_STRING
       case T_STRING:
@@ -244,11 +243,14 @@ GetVpValueWithPrec(VALUE v, long prec, int must)
                                 RSTRING_PTR(v), true);
 #endif /* ENABLE_NUMERIC_STRING */
 
-      case T_BIGNUM:
-	bg = rb_big2str(v, 10);
-	PUSH(bg);
-        return VpCreateRbObject(strlen(RSTRING_PTR(bg)) + VpBaseFig() + 1,
-                                RSTRING_PTR(bg), true);
+      case T_BIGNUM: {
+	VALUE bg = rb_big2str(v, 10);
+        pv = VpCreateRbObject(strlen(RSTRING_PTR(bg)) + VpBaseFig() + 1,
+                              RSTRING_PTR(bg), true);
+        RB_GC_GUARD(bg);
+        return pv;
+      }
+
       default:
 	goto SomeOneMayDoIt;
     }