[Bug libc/19038] New: argp.doc prints incorrectly when it starts with "\v"

[Bug libc/19038] New: argp.doc prints incorrectly when it starts with "\v"

[kstauffer at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19038

            Bug ID: 19038
           Summary: argp.doc prints incorrectly when it starts with "\v"
           Product: glibc
           Version: 2.24
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: kstauffer at gmail dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Created attachment 8661
  --> https://sourceware.org/bugzilla/attachment.cgi?id=8661&action=edit
A argp parser whose ``doc" members starts with '\v'

The attached program has a root argp parser with a "doc" member of "\vAfter"
but this is what "b --help" prints:

Usage: b [OPTION...]

After

  -?, --help                 Give this help list
      --usage                Give a short usage message

After

The first occurrence of "After" is erroneous.

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[Bug libc/19038] argp.doc prints incorrectly when it starts with "\v"

[kstauffer at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19038

--- Comment #1 from Kenny Stauffer <kstauffer at gmail dot com> ---
It looks like the error stems from the argp_doc function. This section:

1469      if (doc)
1470        {
1471          char *vt = strchr (doc, '\v');
1472          inp_text = post ? (vt ? vt + 1 : 0) : doc;
1473          inp_text_limit = (!post && vt) ? (vt - doc) : 0;
1474        }

When processing what should come before the '\v', this section sets inp_text =
doc and inp_text_limit = 0. That value of inp_text_limit is interpreted later
to mean "print the whole string."

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[Bug libc/19038] argp.doc prints incorrectly when it starts with "\v"

[kstauffer at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19038

Kenny Stauffer <kstauffer at gmail dot com> changed:

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

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