From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <glibc-bugs-return-3726-listarch-glibc-bugs=sources.redhat.com@sourceware.org>
Received: (qmail 17626 invoked by alias); 8 Dec 2005 13:34:05 -0000
Received: (qmail 17618 invoked by uid 48); 8 Dec 2005 13:34:04 -0000
Date: Thu, 08 Dec 2005 13:34:00 -0000
From: "michael dot kerrisk at gmx dot net" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sources.redhat.com
Message-ID: <20051208133403.1995.michael.kerrisk@gmx.net>
Reply-To: sourceware-bugzilla@sourceware.org
Subject: [Bug libc/1995] New: fprintf() + fmemopen() error (?)
X-Bugzilla-Reason: CC
Mailing-List: contact glibc-bugs-help@sourceware.org; run by ezmlm
Precedence: bulk
List-Subscribe: <mailto:glibc-bugs-subscribe@sourceware.org>
List-Post: <mailto:glibc-bugs@sourceware.org>
List-Help: <mailto:glibc-bugs-help@sourceware.org>, <http://sourceware.org/lists.html#faqs>
Sender: glibc-bugs-owner@sourceware.org
X-SW-Source: 2005-12/txt/msg00044.txt.bz2
List-Id: <glibc-bugs.sourceware.org>

When run, the program below displays the following output:

    $ ./a.out
    ret = 19 buf=123456789

However, since the fprintf() is causing an overflow in 'buf'
shouldn't the call be returning -1 as an error indication (as 
would happen when fprintf() fails because the disk is full)?

Cheers,

Michael

define _GNU_SOURCE
#include <stdio.h>

int main()
{
  char buf[10];
  FILE *fp;
  int ret;

  fp = fmemopen(buf, sizeof(buf), "w");
  ret = fprintf(fp, "%s", "1234567890123456789");
  fclose(fp);
  printf("ret = %d buf=%s\n", ret, buf);
  return 0;
}

-- 
           Summary: fprintf() + fmemopen() error (?)
           Product: glibc
           Version: 2.3.5
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: michael dot kerrisk at gmx dot net
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=1995

------- You are receiving this mail because: -------
You are on the CC list for the bug, or are watching someone who is.