checking in >= 256k file fatally corrupts rcs file

Tue Oct 8 23:49:00 GMT 2013

On 10/8/2013 04:22, Don Hatch wrote:
>> Checking in a text file of size >= 256k
> corrupts the rcs file, irretrievably losing most of the contents

It's documented in the rcs NEWS file:
 - Env var RCS_MEM_LIMIT controls stdio threshold.
 For speed, RCS uses memory-based routines for files up to
 256 kilobytes, and stream-based (stdio) routines otherwise.
 You can change this threshold value by setting the environment
 variable Â‘RCS_MEM_LIMITÂ’ to a non-negative integer, measured in
 kilobytes. An empty Â‘RCS_MEM_LIMITÂ’ value is silently ignored.
So, use the new environment variable, or build up your huge diffs a few 
steps at a time, so as to avoid spamming this buffer.
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