Use strspn to avoid an explicit loop.
Use fputc rather than printf "\n".
Include quote.h.
(print_stat): Use xreadlink, rather than using readlink directly.
Use the quote function rather than hard-coded double quotes.
Use error, not perror.
instead of the combination of strcat and printf.
(print_statfs) [!FLASK_LINUX]: Print `*' for %S and %C, rather than `S' and `C'.
(print_stat) [!FLASK_LINUX]: Likewise.
[!HAVE_SYS_STATVFS_H && !HAVE_SYS_VFS_H]: Include sys/param.h
and sys/mount.h, to get decl of struct statfs on NetBSD 1.5.2.
(NAMEMAX_FORMAT, STRUCT_STATVFS): Define.
(HAVE_STRUCT_STATXFS_F_TYPE, SB_F_NAMEMAX): Define.
Remove `static' attribute from decl of program_name.
(human_fstype): Use f_basetype or f_fstypename if available.
(print_human_time): Use nstrftime and an ISO format string, in
place of strftime with `%c'. The latter is too locale-dependent.
(print_statfs): Deal with lots of portability issues: some fields
are available only with statfs, others only with statvfs, and
some are available in both, but with different types.
(do_statfs) [DEFAULT_FORMAT_TERSE]: Factor out.
[DEFAULT_FORMAT_VERBOSE]: Likewise.
Include inttypes.h.
(PRIdMAX, PRIuMAX): Define, if not already defined.
(print_statfs): Use those macros, not the literal strings.
(print_stat): Likewise.
Remove lots of #if directives involving FLASK_LINUX
[!FLASK_LINUX] (is_flask_enabled): Define.
(stat_secure, lstat_secure): Define.
(print_statfs): Remove lots of nested #if directives.
Instead, rely on support fo %llu and %lld printf formats --
but that is only temporary, since it's not porable enough.
(main): Hoist is_flask_enabled test to be done here, rather
than in each of do_stat and do_statfs for every argument.
[HAVE_SYS_SYSMACROS_H]: Guard inclusion of sys/sysmacros.h.
(PROGRAM_NAME, AUTHORS): Define.
(long_options): Declare/define.
(print_human_access): Rewrite to use mode_string.
(usage): Rewrite.
(main): Use getopt_long.
Jim Meyering