[Bug libc/16088] New: Implement strptime %Z

[Bug libc/16088] New: Implement strptime %Z

[neleai at seznam dot cz]

https://sourceware.org/bugzilla/show_bug.cgi?id=16088

            Bug ID: 16088
           Summary: Implement strptime %Z
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: neleai at seznam dot cz
                CC: drepper.fsp at gmail dot com

A strptime %Z currently only reads timezone but ignores it. Actual
implementation would be needed.

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[Bug libc/16088] Implement strptime %Z

[allachan at au1 dot ibm.com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16088

paxdiablo <allachan at au1 dot ibm.com> changed:

           What    |Removed                     |Added
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                 CC|                            |allachan at au1 dot ibm.com

--- Comment #1 from paxdiablo <allachan at au1 dot ibm.com> ---
See also https://sourceware.org/bugzilla/show_bug.cgi?id=14876.

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[Bug libc/16088] Implement strptime %Z

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16088

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
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              Flags|                            |security-

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[Bug libc/16088] Implement strptime %Z

[vincent at bernat dot im]

https://sourceware.org/bugzilla/show_bug.cgi?id=16088

Vincent Bernat <vincent at bernat dot im> changed:

           What    |Removed                     |Added
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                 CC|                            |vincent at bernat dot im

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[Bug time/16088] Implement strptime %Z

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=16088

Joseph Myers <jsm28 at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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          Component|libc                        |time

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[Bug time/16088] Implement strptime %Z

[yann at droneaud dot fr]

https://sourceware.org/bugzilla/show_bug.cgi?id=16088

Yann Droneaud <yann at droneaud dot fr> changed:

           What    |Removed                     |Added
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                 CC|                            |yann at droneaud dot fr

--- Comment #2 from Yann Droneaud <yann at droneaud dot fr> ---
Created attachment 14265
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14265&action=edit
test case to demonstrate failure in parsing %Z format

(In reply to Ondrej Bilka from comment #0)
> A strptime %Z currently only reads timezone but ignores it. Actual
> implementation would be needed.

And unfortunately the way it ignores the timezone name makes strptime() unable
to parse names that are not delimited by white space.

For example strptime(, "%Z/",) will return NULL, because the trailing slash
will be consumed as the timezone name.

This corner case makes strptime() unable to parse strftime() output:

    strftime() produced "GMT/"
    strptime() failed to parse "GMT/"

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[Bug time/16088] Implement strptime %Z

[lancasterharp at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16088

Stanley Lancaster <lancasterharp at gmail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |lancasterharp at gmail dot com

--- Comment #3 from Stanley Lancaster <lancasterharp at gmail dot com> ---
What would an actual implementation look like? The tm struct this function
fills out has no slot for timezone information, and the manpage says that the
%Z option is only included in strptime for "reasons of symmetry" with strftime.
Should this option do anything other than skip over characters until the next
character in the format string is reached?

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[Bug time/16088] Implement strptime %Z

[lancasterharp at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16088

--- Comment #4 from Stanley Lancaster <lancasterharp at gmail dot com> ---
Created attachment 14944
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14944&action=edit
Proposed Patch, Submitted by Email,

Patch for this bug has been submitted via email. The patchwork page for it can
be found at
https://patchwork.sourceware.org/project/glibc/patch/20230622150021.3828261-1-lancasterharp@gmail.com/

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[Bug time/16088] Implement strptime %Z

[sam at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=16088

Sam James <sam at gentoo dot org> changed:

           What    |Removed                     |Added
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                 CC|                            |sam at gentoo dot org

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