Leaky redaction.
For the 2008 Underhanded C Contest.

This contribution was written by Linus Akesson <linus@linusakesson.net>.

Building:

	gcc -Wall -o redact redact.c

	The code has been verified on Linux (i386 and x86_64) and SunOS
	(sparc, both gcc and Sun cc).

Running:

	redact [x1 y1 x2 y2] [...] <source.ppm >destination.ppm
