Check that memchr does not read past the first occurrence of the byte.

[pspp] / tests / test-memchr.c

diff --git a/tests/test-memchr.c b/tests/test-memchr.c
index bf99a82edb71dc304cc6eded614fb4ca396b5d9c..1124f8b5871362e1bec3f5d8b6bbd0fa6446b581 100644 (file)
--- a/tests/test-memchr.c
+++ b/tests/test-memchr.c
@@ -94,6 +94,36 @@ main ()
       }
   }
 
+  /* Check that memchr() does not read past the first occurrence of the
+     byte being searched.  See the Austin Group's clarification
+     <http://www.opengroup.org/austin/docs/austin_454.txt>.  */
+  {
+    char *page_boundary = (char *) zerosize_ptr ();
+
+    if (page_boundary != NULL)
+      {
+       int n;
+
+       for (n = 1; n <= 500; n++)
+         {
+           char *mem = page_boundary - n;
+           memset (mem, 'X', n);
+           ASSERT (MEMCHR (mem, 'U', n) == NULL);
+
+           {
+             int i;
+
+             for (i = 0; i < n; i++)
+               {
+                 mem[i] = 'U';
+                 ASSERT (MEMCHR (mem, 'U', 4000) == mem + i);
+                 mem[i] = 'X';
+               }
+           }
+         }
+      }
+  }
+
   free (input);
 
   return 0;