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[Ada] Avoid storage leak in gnatchop

Message ID 20121205103858.GA8153@adacore.com
State New
Headers show

Commit Message

Arnaud Charlet Dec. 5, 2012, 10:38 a.m. UTC 
This patch removes a storage leak in gnatchop, and makes it slightly more
efficient. No noticeable change in behavior, so no test.

Tested on x86_64-pc-linux-gnu, committed on trunk

2012-12-05  Bob Duff  <duff@adacore.com>

	* gnatchop.adb (Read_File): Avoid storage leak, and in most cases avoid
	an extra copy of the string.
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Patch

Index: gnatchop.adb
===================================================================
--- gnatchop.adb	(revision 194188)
+++ gnatchop.adb	(working copy)
@@ -6,7 +6,7 @@ 
 --                                                                          --
 --                                 B o d y                                  --
 --                                                                          --
---          Copyright (C) 1998-2011, Free Software Foundation, Inc.         --
+--          Copyright (C) 1998-2012, Free Software Foundation, Inc.         --
 --                                                                          --
 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
 -- terms of the  GNU General Public License as published  by the Free Soft- --
@@ -1004,7 +1004,7 @@ 
    is
       Length      : constant File_Offset := File_Offset (File_Length (FD));
       --  Include room for EOF char
-      Buffer      : constant String_Access := new String (1 .. Length + 1);
+      Buffer      : String_Access := new String (1 .. Length + 1);
 
       This_Read   : Integer;
       Read_Ptr    : File_Offset := 1;
@@ -1020,9 +1020,16 @@ 
       end loop;
 
       Buffer (Read_Ptr) := EOF;
-      Contents := new String (1 .. Read_Ptr);
-      Contents.all := Buffer (1 .. Read_Ptr);
 
+      if Read_Ptr = Length then
+         Contents := Buffer;
+
+      else
+         Contents := new String (1 .. Read_Ptr);
+         Contents.all := Buffer (1 .. Read_Ptr);
+         Free (Buffer);
+      end if;
+
       --  Things aren't simple on VMS due to the plethora of file types and
       --  organizations. It seems clear that there shouldn't be more bytes
       --  read than are contained in the file though.