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| From | Chet Ramey <chet.ramey@case.edu> |
| Newsgroups | gnu.bash.bug |
| Subject | Re: %q with truncating size loses safeness of %q |
| Date | Fri, 17 Apr 2020 16:12:20 -0400 |
| Organization | ITS, Case Western Reserve University |
| Lines | 32 |
| Approved | bug-bash@gnu.org |
| Message-ID | <mailman.539.1587154350.3066.bug-bash@gnu.org> (permalink) |
| References | <CAOj-5WCqxqh=Gcda9k6y4orQaQYXPgsOgNEOVN1AdZQrkCVbtg@mail.gmail.com> <4bacf2f0-9802-67d3-f30b-80e37d058a4a@case.edu> |
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| To | Sam Liddicott <sam@liddicott.com>, bug-bash@gnu.org, bash@packages.debian.org |
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On 4/17/20 10:22 AM, Sam Liddicott wrote: > Bash Version: 4.4 > Patch Level: 20 > Release Status: release > > Also occurs on 5.0.7(1)-release > > Description: > printf %q with a truncating size will emit partially escaped > sequence thus losing the safety and composability that %q > is intended to provide. > > Repeat-By: > $ printf 'echo %.2q%q\n' "a'b" ';ls' > echo a\\;ls > The semi-colon is no longer escaped, the expectation of > the %q formatter is lost I would say this is a programmer error. The way precisions work with string arguments is that the argument is fetched or generated (this includes generating the quoted string for %q or the expanded string for %b) and then printf writes number of bytes (!) from that generated string specified by the precision. Chet -- ``The lyf so short, the craft so long to lerne.'' - Chaucer ``Ars longa, vita brevis'' - Hippocrates Chet Ramey, UTech, CWRU chet@case.edu http://tiswww.cwru.edu/~chet/
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Re: %q with truncating size loses safeness of %q Chet Ramey <chet.ramey@case.edu> - 2020-04-17 16:12 -0400
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