open_output
static void open_output(const char *, const char *);
open_output(infile, outfilename);
open_output(infile, outfilename);
open_output(infile, outfilename);
open_output(infile, outfilename);
open_output(infile, outfilename);
open_output(infile, outfilename);
open_output(infile, outfilename);