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VMS: bs-nl and command handling fixes.

From: John E. Malmberg
Subject: VMS: bs-nl and command handling fixes.
Date: Thu, 27 Nov 2014 21:44:06 -0600
User-agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0

This patch is a complete rewrite of the VMS command parser.

In order to support the existing VMS recipe syntax which is a combination of VMS and Posix shell syntax, VMS had to reparse the action lines to simulate the Posix shell syntax.

The existing parsing code was making too many incorrect assumptions about how DCL and POSIX syntax are actually written and needed a complete rewrite. It was also just estimating the size of the buffer to build the command and never doing any bounds checking.

This new code knows the VMS DCL limitations and better parses the action lines. While a temporary command file may still be used in some cases, redirection no longer uses temporary files.

Before this fix: 43 out of 466 tests fail.
After this fix:  21 out of 466 tests fail.

Backwards compatibility note: The old parser tolerated some DCL syntax errors that the new parser does not allow.


Attachment: 0001-Fix-bs-nl-handling-for-VMS.patch
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