From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <zsh-workers-return-33718-mason-zsh=primenet.com.au@zsh.org>
Received: (qmail 28375 invoked by alias); 20 Nov 2014 01:48:12 -0000
Mailing-List: contact zsh-workers-help@zsh.org; run by ezmlm
Precedence: bulk
X-No-Archive: yes
List-Id: Zsh Workers List <zsh-workers.zsh.org>
List-Post: <mailto:zsh-workers@zsh.org>
List-Help: <mailto:zsh-workers-help@zsh.org>
X-Seq: 33718
Received: (qmail 2873 invoked from network); 20 Nov 2014 01:48:09 -0000
X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on f.primenet.com.au
X-Spam-Level: 
X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_LOW,
	T_HDRS_LCASE,T_MANY_HDRS_LCASE autolearn=ham version=3.3.2
X-Authority-Analysis: v=2.1 cv=AduIQRnG c=1 sm=1 tr=0
 a=5FaaCEzylGLpkmKDZB0s2g==:117 a=5FaaCEzylGLpkmKDZB0s2g==:17 a=G8GL833Es-AA:10
 a=IkcTkHD0fZMA:10 a=h5WVT1OF_D3YUEkhZSQA:9 a=QEXdDO2ut3YA:10
Message-id: <546D4854.1030604@eastlink.ca>
Date: Wed, 19 Nov 2014 17:48:04 -0800
From: Ray Andrews <rayandrews@eastlink.ca>
User-Agent: Mozilla/5.0 (X11; Linux i686; rv:31.0) Gecko/20100101 Icedove/31.2.0
MIME-version: 1.0
To: Zsh hackers list <zsh-workers@zsh.org>
Subject: trying dputs
Content-type: text/plain; charset=utf-8; format=flowed
Content-transfer-encoding: 7bit


int
bin_whence(char *nam, char **argv, Options ops, int func)
{
     HashNode hn;
     Patprog pprog;
     int returnval = 0;
     int printflags = 0;
     int aliasflags;
     int csh, all, v, wd;
     int informed;
     char *cnam, **allmatched = 0;


If I steal 'opts->args' with a test string like this:

//char *garbage = "utter garbage";
//ops->args = &garbage;

... I get what I expect from this:

dputs("\nargs: %s", *(ops->args));

... but if I leave the pointer unmolested, I get a zsh
segmentation fault. Why is that? I'd expect to either
get a real string, or NULL. It's as if 'ops->args' is
dangling.

The function works fine even with the dummy string, so
I'm pretty sure 'ops->args' isn't needed. Still, I'd
say it shouldn't barf if I try to print it.


     /* Check some option information */
     csh = OPT_ISSET(ops,'c');
     v   = OPT_ISSET(ops,'v');
     all = OPT_ISSET(ops,'a');
     wd  = OPT_ISSET(ops,'w');

     if (OPT_ISSET(ops,'w'))