Re: PATCH: Memorey leak with PS4 usage.

[Peter Stephenson <pws@cambridgesiliconradio.com>]

> > } There seems to be a memory leak issue with the use of promptexpand.
> > } I've included a patch for utils.c.
> I think the these lines in promptexpand:
> Are not allocated off the internal heap.

Yes, this needs freeing, as do the other uses in subst.c below.
promptexpand always allocates its own storage, and unmetafy returns the
same area of memory.

I think I'll commit these, too, on the basis that if this is wrong then I
ought to go and do something else like flower-arranging.

Index: Src/subst.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/subst.c,v
retrieving revision 1.7
diff -u -r1.7 subst.c
--- Src/subst.c	2000/05/31 08:56:24	1.7
+++ Src/subst.c	2000/06/01 09:01:20
@@ -1661,18 +1661,24 @@
 		aval = arrdup(aval), copied = 1;
 	    ap = aval;
 	    for (; *ap; ap++) {
+		char *tmps;
 		unmetafy(*ap, &len);
 		untokenize(*ap);
-		*ap = unmetafy(promptexpand(metafy(*ap, len, META_NOALLOC),
-					    0, NULL, NULL), &len);
+		tmps = unmetafy(promptexpand(metafy(*ap, len, META_NOALLOC),
+					     0, NULL, NULL), &len);
+		*ap = dupstring(tmps);
+		free(tmps);
 	    }
 	} else {
+	    char *tmps;
 	    if (!copied)
 		val = dupstring(val), copied = 1;
 	    unmetafy(val, &len);
 	    untokenize(val);
-	    val = unmetafy(promptexpand(metafy(val, len, META_NOALLOC),
+	    tmps = unmetafy(promptexpand(metafy(val, len, META_NOALLOC),
 					0, NULL, NULL), &len);
+	    val = dupstring(tmps);
+	    free(tmps);
 	}
 	opts[PROMPTSUBST] = ops;
 	opts[PROMPTBANG] = opb;

-- 
Peter Stephenson <pws@cambridgesiliconradio.com>
Cambridge Silicon Radio, Unit 300, Science Park, Milton Road,
Cambridge, CB4 0XL, UK                          Tel: +44 (0)1223 392070