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joost@rulcmc.leidenuniv.nl (joost witteveen) writes:
>If I construct a ostrstream, with
>  ostrstream os (s,sizeof(s))
>do I have to clean ALL of s before I use it?

No.

>I'm getting strange results (i.e. I have to init ALL of s to 0)
>with g++ 2.7.1, and 2.3.3.

You're getting the expected results.

>So, my question is: is this a bug in g++, or am I missing something
>about the string streams?

You're missing the fact that you have to do the null termination yourself.
There is a special function-object named ends that does this for you.

You may also be assuming that the null character in the s string does
something.  It does not.  ostrstream does not use the strcat mechanism
to append.  It keeps track of the ending position and writes there.

Here's your fixed program:

#include <iostream.h>
#include <strstream.h>
int main(int,char **){
  int i;
  char s[]="\000hhhhhhhhhhhhhhhhhhhhhhhhhhhh";
  cout<<"initial s:"<<s<<endl; //an empty string here.

  ostrstream os(s,sizeof(s));
  os<<"hello, world" << ends;	// ends terminates the string
  cout<<s<<endl;
}
-- 
-- Joe Buck 	<jbuck@synopsys.com>	(not speaking for Synopsys, Inc)
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