Austin Group Defect Tracker

Aardvark Mark IV


Viewing Issue Simple Details Jump to Notes ] Issue History ] Print ]
ID Category Severity Type Date Submitted Last Update
0001826 [Issue 8 drafts] Shell and Utilities Comment Enhancement Request 2024-04-07 01:48 2024-05-20 15:29
Reporter lanodan View Status public  
Assigned To
Priority normal Resolution Rejected  
Status Closed   Product Version Draft 4.1
Name Haelwenn Monnier
Organization
User Reference
Section du
Page Number 2808
Line Number 93064-93067
Final Accepted Text
Summary 0001826: du: space used between <size> and <pathname>, while common implementations use tab
Description Ones where a tab is used as separator, version and permalinks as observance point:
- BSD 4.1 (literal) https://github.com/dspinellis/unix-history-repo/blob/6e5f0f7526b38c1ab3620133892ecf1fe15a1d2b/usr/src/usr.bin/du/du.c#L158 [^]
- NetBSD http://cvsweb.netbsd.org/bsdweb.cgi/src/usr.bin/du/du.c?rev=1.36&content-type=text/x-cvsweb-markup&only_with_tag=MAIN [^]
- OpenBSD https://cvsweb.openbsd.org/src/usr.bin/du/du.c?rev=1.33&content-type=text/x-cvsweb-markup [^]
- FreeBSD https://cgit.freebsd.org/src/tree/usr.bin/du/du.c?id=0b8224d1cc9dc6c9778ba04a75b2c8d47e5d7481#n316 [^]
- MacOS https://github.com/apple-oss-distributions/file_cmds/blob/file_cmds-430.100.5/du/du.c#L402 [^]
- GNU coreutils 9.4, even with POSIXLY_CORRECT=1 and POSIX_ME_HARDER=1
- BusyBox 1.36.1
- ToyBox https://github.com/landley/toybox/blob/9303bd8ae667ef6385f070aa4937ff8746a2ff59/toys/posix/du.c#L75 [^]

illumos being the only one I could find where when compiled for /usr/xpg4/bin/du rather than /usr/bin/du, a space is used: https://github.com/illumos/illumos-gate/blob/1979231e1e29c981e5d1e6cee60f2db46d052b00/usr/src/cmd/du/du.c#L72-L81 [^]

A hunch I have is the literal tab degrading into a space on POSIX side of things.
Desired Action Given how widespread tab separation is: Either changing the specified format of du(1), line 93067 on Draft 4.1, from "%d %s\n" to "%d\t%s\n" or clarifying that either space or tab can be used as separator.
Tags No tags attached.
Attached Files

- Relationships

-  Notes
(0006742)
philip-guenther (reporter)
2024-04-07 02:07

The standard doesn't specify a space between <size> and <pathname>. It says:
----
STDOUT
    The output from du shall consist of the amount of space allocated to a file and the name of the
    file, in the following format:
    "%d %s\n", <size>, <pathname>
----

But the STDOUT section is _defined_ by XCU 1.4 where it says:
----
    The STDOUT section completely describes the standard output of the utility. This
    section is frequently merely a reference to the following section, OUTPUT FILES,
    because many utilities treat standard output and output files in the same manner.
...
    Record formats are described in a notation similar to that used by the C-language
    function, printf(). See XBD Chapter 5 (on page 121) for a description of this notation.
----

and when you follow that last reference you find:
----
    The following characters have the following special meaning in the format string:
    ’ ’ (An empty character position.) Represents one or more <blank> characters.
    ∆ Represents exactly one <space> character.
----

So the du specification specifies one or more <blank> (space and tab) characters between the <size> and <pathname>

- Issue History
Date Modified Username Field Change
2024-04-07 01:48 lanodan New Issue
2024-04-07 01:48 lanodan Name => Haelwenn Monnier
2024-04-07 01:48 lanodan Section => du
2024-04-07 01:48 lanodan Page Number => 2808
2024-04-07 01:48 lanodan Line Number => 93064-93067
2024-04-07 02:07 philip-guenther Note Added: 0006742
2024-05-20 15:29 Don Cragun Status New => Closed
2024-05-20 15:29 Don Cragun Resolution Open => Rejected


Mantis 1.1.6[^]
Copyright © 2000 - 2008 Mantis Group
Powered by Mantis Bugtracker