readline in rrd_open.c reads the file in 8 KB blocks, and calls realloc for

readline in rrd_open.c reads the file in 8 KB blocks, and calls realloc for
each block. realloc is very slow in Mac OS X for huge blocks, e.g. when
restoring databases from huge xml files. This patch finds the size of the
file, and starts out with malloc'ing the full size.
-- Peter Speck <speck@ruc.dk>

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk/program@205 a5681a0c-68f1-0310-ab6d-d61299d08faa