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| ID | Category | Severity | Type | Date Submitted | Last Update | |||||||
| 0001826 | [Issue 8 drafts] Shell and Utilities | Comment | Enhancement Request | 2024-04-07 01:48 | 2024-04-07 02:07 | |||||||
| Reporter | lanodan | View Status | public | |||||||||
| Assigned To | ||||||||||||
| Priority | normal | Resolution | Open | |||||||||
| Status | New | 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. |
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| 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. | |||||||||||
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Notes |
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(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> |
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Issue History |
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| 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 | |
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