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Re: data_out

From: John Darrington
Subject: Re: data_out
Date: Fri, 28 Apr 2006 12:53:07 +0800
User-agent: Mutt/1.5.9i

On Thu, Apr 27, 2006 at 09:32:52PM -0700, Ben Pfaff wrote:
     John Darrington <address@hidden> writes:
     > Any objections if  we change the signature of data_out, so that the
     > first argument is char ** or struct string * , and have the function
     > allocate the required amount of storage?
     > Right now, we never know how big a string needs to be passed to it.
     We don't?  The string has to be as wide as the field width, fp->w.

I stand corrected.  We do know, but it's non constant. It might be 1
on the first call and 10000 the next.

Perhaps I should explain my motives. I want to append the result to a struct 
string.  The only way I can currently do that is to violate the encapsulation 
of struct string.

       struct string s;
       x = ds_length(&s);

       /* Somehow make sure that s has sufficient length */

       data_out (ds_c_str(&s)+x, &v->print, case_data (c, v->fv));


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