rcs_choosefile
fd = rcs_choosefile(pb.filename, pb.fpath, sizeof(pb.fpath));
fd = rcs_choosefile(argv[i], fpath, sizeof(fpath));
if ((fd = rcs_choosefile(fname, fpath, sizeof(fpath))) < 0)
fd = rcs_choosefile(argv[i], fpath, sizeof(fpath));
if ((fd = rcs_choosefile(argv[0], fpath, sizeof(fpath))) < 0)
fd = rcs_choosefile(argv[i], fpath, sizeof(fpath));
ofd = rcs_choosefile(oldfilename, ofpath, sizeof(ofpath));
int rcs_choosefile(const char *, char *, size_t);
fd = rcs_choosefile(argv[i], fpath, sizeof(fpath));