tree bc33acac3b5a1ce9800e35d333708c1d5cf6e917
parent d827fcace2c605c0114859d77cb9b2b47f37e693
author Michael Forney <mforney@mforney.org> 1463277414 -0700
committer sin <sin@2f30.org> 1468055390 +0100

sort: Fix line comparison when col buffer contains data from longer line

I'm not sure if there are other implications of this or not, but
the issue is that columns() uses len to store the allocated buffer
size, but linecmp() compares up to len bytes. If those trailing
bytes do not match, the line is considered not matching, even though
the relevant parts of the buffer do match.

To resolve this, also keep track of column capacity. Additionally,
since there is no reason to keep the existing data when resizing,
just use free and emalloc rather than erealloc.

The simplest case I could reduce it to is this:

if [ "$(printf '%s\n' a a xxb xxc | ./sort -u)" = "$(printf '%s\n' a xxb xxc)" ] ; then
	echo pass
else
	echo fail
fi