# HG changeset patch
# User John W. Eaton <jwe@octave.org>
# Date 1269977079 14400
# Node ID a9649f994b073ba2bfca7d24d70373becb4b949e
# Parent  f261f936bf36b74f1750e10c1ba435b6ee484b7e
avoid segfault in string_vector constructor

diff --git a/liboctave/ChangeLog b/liboctave/ChangeLog
--- a/liboctave/ChangeLog
+++ b/liboctave/ChangeLog
@@ -1,3 +1,8 @@
+2010-03-30  John W. Eaton  <jwe@octave.org>
+
+	* str-vec.cc (string_vector::string_vector (const char * const *)): 
+	Create empty string_vector object if arg is NULL.
+
 2010-03-29  Jaroslav Hajek  <highegg@gmail.com>
 
 	* idx-vector.cc (idx_vector::raw): New method.
diff --git a/liboctave/str-vec.cc b/liboctave/str-vec.cc
--- a/liboctave/str-vec.cc
+++ b/liboctave/str-vec.cc
@@ -80,10 +80,13 @@
 {
   octave_idx_type n = 0;
 
-  const char * const *t = s;
+  if (s)
+    {
+      const char * const *t = s;
 
-  while (*t++)
-    n++;
+      while (*t++)
+        n++;
+    }
 
   resize (n);