Better default buffer size in random expr generation

rpn_jit.c

@@ -173,6 +173,8 @@ int rpn_expr_untokenize(rpn_expr_t *expr, rpn_tokenized_t *tokens, char long_op)
 
 char* rpn_random(size_t op_sz, size_t args_count)
 {
+	const int BUFF_ALLOC = 4096;
+
 	double step;
 	size_t i, buff_sz, offset, rnd;
 	char *buff, *cur;
@@ -195,9 +197,9 @@ char* rpn_random(size_t op_sz, size_t args_count)
 
 	for(i=0; i<op_sz; i++)
 	{
-		if(buff_sz - offset < 21)
+		if(buff_sz - offset < BUFF_ALLOC / 4)
 		{
-			buff_sz += 40;
+			buff_sz += BUFF_ALLOC;
 			cur = realloc(buff, sizeof(char) * buff_sz);
 			if(!cur)
 			{