From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gdb-prs-return-15707-listarch-gdb-prs=sources.redhat.com@sourceware.org>
Received: (qmail 9251 invoked by alias); 12 May 2014 08:00:31 -0000
Mailing-List: contact gdb-prs-help@sourceware.org; run by ezmlm
Precedence: bulk
List-Id: <gdb-prs.sourceware.org>
List-Subscribe: <mailto:gdb-prs-subscribe@sourceware.org>
List-Archive: <http://sourceware.org/ml/gdb-prs/>
List-Post: <mailto:gdb-prs@sourceware.org>
List-Help: <mailto:gdb-prs-help@sourceware.org>, <http://sourceware.org/lists.html#faqs>
Sender: gdb-prs-owner@sourceware.org
Received: (qmail 9227 invoked by uid 48); 12 May 2014 08:00:31 -0000
From: "f.heckenbach@fh-soft.de" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug gdb/16933] New: p omits trailing 0 when printing a range of
 chars
Date: Mon, 12 May 2014 08:00:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gdb
X-Bugzilla-Component: gdb
X-Bugzilla-Version: 7.7
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: f.heckenbach@fh-soft.de
X-Bugzilla-Status: NEW
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: unassigned at sourceware dot org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags:
X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status
 bug_severity priority component assigned_to reporter
Message-ID: <bug-16933-4717@http.sourceware.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
X-Bugzilla-URL: http://sourceware.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-SW-Source: 2014-q2/txt/msg00213.txt.bz2

https://sourceware.org/bugzilla/show_bug.cgi?id=16933

            Bug ID: 16933
           Summary: p omits trailing 0 when printing a range of chars
           Product: gdb
           Version: 7.7
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: f.heckenbach@fh-soft.de

This bug was reported as Debian bug #666216 for gdb 7-0. According to Hector
Oron, it is still reproducable with 7.7-1.

p omits trailing 0 when printing a range of chars.
To reproduce:

# echo 'char foo[5] = { 1, 2, 0, 4, 0 };' > foo.c
# gcc -c -g foo.c
# gdb foo.o
(gdb) p foo[0]@5
$1 = "\001\002\000\004"

What I really wanted would be "{1, 2, 0, 4, 0}", like for other
integer types, since I explicitly selected a single element and gave
a range (@5), but if it must print it as a string, it should at
least print all of the bytes.

I know that's probably due to C's notorious confusion between
integers and characters, and I also know there are other ways to
dump some bytes in gdb.

But still it seems plain wrong to print 4 chars if 5 items were
explicitly requested, just because the last one happens to be 0.
Note that it's not printing a 0-terminated string either: The
embedded "\000" is printed; just one terminating 0 is omitted.

(Which gets very confusing with larger arrays, if you look for
something near the end, thinking the last one printed is the last
one requested and then go hunting your off-by-one bug, only to
realize later there wasn't any ...)

-- 
You are receiving this mail because:
You are on the CC list for the bug.