Copyright++. (Not all the toplevel *.h have one, it seems.)

[p5sagit/p5-mst-13.2.git] / util.c

diff --git a/util.c b/util.c
index 49119ed..f4b08a6 100644 (file)
--- a/util.c
+++ b/util.c
@@ -1,6 +1,6 @@
 /*    util.c
  *
- *    Copyright (c) 1991-2001, Larry Wall
+ *    Copyright (c) 1991-2002, Larry Wall
  *
  *    You may distribute under the terms of either the GNU General Public
  *    License or the Artistic License, as specified in the README file.
@@ -905,7 +905,8 @@ Perl_savepv(pTHX_ const char *sv)
 =for apidoc savepvn
 
 Copy a string to a safe spot.  The C<len> indicates number of bytes to
-copy.  This does not use an SV.
+copy. If pointer is NULL allocate space for a string of size specified.
+This does not use an SV.
 
 =cut
 */
@@ -916,8 +917,14 @@ Perl_savepvn(pTHX_ const char *sv, register I32 len)
     register char *newaddr;
 
     New(903,newaddr,len+1,char);
-    Copy(sv,newaddr,len,char);         /* might not be null terminated */
-    newaddr[len] = '\0';               /* is now */
+    /* Give a meaning to NULL pointer mainly for the use in sv_magic() */
+    if (sv) {
+       Copy(sv,newaddr,len,char);      /* might not be null terminated */
+       newaddr[len] = '\0';            /* is now */
+    }
+    else {
+       Zero(newaddr,len+1,char);
+    }
     return newaddr;
 }