PR tree-optimization/89644 - false-positive -Warray-bounds on strncpy with unterminated array

gcc/ChangeLog:
	* tree-ssa-strlen.c (handle_builtin_stxncpy): Use full_string_p
	rather than endptr as an indicator of nul-termination.

From-SVN: r269809

gcc/ChangeLog

 2019-03-19  Martin Sebor  <msebor@redhat.com>
 
 	PR tree-optimization/89644
+	* tree-ssa-strlen.c (handle_builtin_stxncpy): Use full_string_p
+	rather than endptr as an indicator of nul-termination.
+
+	PR tree-optimization/89644
 	* tree-ssa-strlen.c (handle_builtin_stxncpy): Consider unterminated
 	arrays in determining sequence sizes in strncpy and stpncpy.
 

gcc/tree-ssa-strlen.c

@@ -2210,7 +2210,7 @@ handle_builtin_stxncpy (built_in_function, gimple_stmt_iterator *gsi)
 	 if it is known to be nul-terminated.  */
       if (sidst->nonzero_chars)
 	{
-	  if (sidst->endptr)
+	  if (sidst->full_string_p)
 	    {
 	      /* String is known to be nul-terminated.  */
 	      tree type = TREE_TYPE (sidst->nonzero_chars);
@@ -2236,7 +2236,7 @@ handle_builtin_stxncpy (built_in_function, gimple_stmt_iterator *gsi)
 	 nul if its known to be nul-terminated.  */
       if (sisrc->nonzero_chars)
 	{
-	  if (sisrc->endptr)
+	  if (sisrc->full_string_p)
 	    {
 	      tree type = TREE_TYPE (sisrc->nonzero_chars);
 	      srcsize = fold_build2 (PLUS_EXPR, type, sisrc->nonzero_chars,