Patch for gawk overflow

[Dustin Childers <dustin () acm org>]

I tested the overflow on a FreeBSD 4.5-STABLE 
system and it worked. This patch is a patch for the 
io.c file. The error was in a strcpy(). The 'file' char 
should of been filtered before passing it on to strcpy. 
The patch has been tested and works on my system.
Thanks.

http://www.digitux.net/io.c.patch

Dustin E. Childers
Security Administrator
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