mount_argf
ma = mount_argf(ma, "uid", "%d", args.uid);
ma = mount_argf(ma, "gid", "%d", args.gid);
ma = mount_argf(ma, "mask", "%d", args.fmask);
ma = mount_argf(ma, "dirmask", "%d", args.dmask);
ma = mount_argf(ma, "ssector", "%u", args.ssector);
ma = mount_argf(ma, "uid", "%d", args.uid);
ma = mount_argf(ma, "gid", "%d", args.gid);
ma = mount_argf(ma, "mask", "%d", args.mask);
ma = mount_argf(ma, "dirmask", "%d", args.dirmask);
ma = mount_argf(ma, "dev", "%d", args.dev);
ma = mount_argf(ma, "uid", "%d", args.uid);
ma = mount_argf(ma, "gid", "%d", args.gid);
ma = mount_argf(ma, "file_mode", "%d", args.file_mode);
ma = mount_argf(ma, "dir_mode", "%d", args.dir_mode);
ma = mount_argf(ma, "caseopt", "%d", args.caseopt);
struct mntarg *mount_argf(struct mntarg *ma, const char *name, const char *fmt, ...);