X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=tests%2Ftest-memmem.c;h=7f0f9257a3ee863ae472d43828178b3562793520;hb=acf2fa819ee5f1c5acb832dd4b9ebe52a3985699;hp=50fdfb81e39b36a31d74bd4b4ca72b617a7ce10e;hpb=6cb0a37002faab5fd49c77feb823faec55069e86;p=gnulib.git

diff --git a/tests/test-memmem.c b/tests/test-memmem.c
index 50fdfb81e..7f0f9257a 100644
--- a/tests/test-memmem.c
+++ b/tests/test-memmem.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2004, 2007 Free Software Foundation
+ * Copyright (C) 2004, 2007-2009 Free Software Foundation
  * Written by Bruno Haible and Eric Blake
  *
  * This program is free software: you can redistribute it and/or modify
@@ -19,8 +19,12 @@
 
 #include <string.h>
 
+#include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <unistd.h>
+
+#include "zerosize-ptr.h"
 
 #define ASSERT(expr) \
   do									     \
@@ -28,6 +32,7 @@
       if (!(expr))							     \
         {								     \
           fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
+          fflush (stderr);						     \
           abort ();							     \
         }								     \
     }									     \
@@ -36,6 +41,15 @@
 int
 main (int argc, char *argv[])
 {
+#if HAVE_DECL_ALARM
+  /* Declare failure if test takes too long, by using default abort
+     caused by SIGALRM.  All known platforms that lack alarm also lack
+     memmem, and the replacement memmem is known to not take too
+     long.  */
+  signal (SIGALRM, SIG_DFL);
+  alarm (100);
+#endif
+
   {
     const char input[] = "foo";
     const char *result = memmem (input, strlen (input), "", 0);
@@ -60,9 +74,15 @@ main (int argc, char *argv[])
     ASSERT (result == NULL);
   }
 
-  /* Check that length 0 does not dereference NULL.  */
   {
-    const char *result = memmem (NULL, 0, "foo", 3);
+    const char input[] = "ABC ABCDAB ABCDABCDABDE";
+    const char *result = memmem (input, strlen (input), "ABCDABCD", 8);
+    ASSERT (result == input + 11);
+  }
+
+  /* Check that length 0 does not dereference the pointer.  */
+  {
+    const char *result = memmem (zerosize_ptr (), 0, "foo", 3);
     ASSERT (result == NULL);
   }
 
@@ -137,10 +157,33 @@ main (int argc, char *argv[])
 	result = memmem (haystack, 2 * m + 1, needle, m + 1);
 	ASSERT (result == haystack + m);
       }
-    if (needle != NULL)
-      free (needle);
-    if (haystack != NULL)
-      free (haystack);
+    free (needle);
+    free (haystack);
+  }
+
+  /* Check that long needles not present in a haystack can be handled
+     with sublinear speed.  */
+  {
+    size_t repeat = 10000;
+    size_t m = 1000000;
+    size_t n = 1000;
+    char *haystack = (char *) malloc (m);
+    char *needle = (char *) malloc (n);
+    if (haystack != NULL && needle != NULL)
+      {
+	const char *result;
+
+	memset (haystack, 'A', m);
+	memset (needle, 'B', n);
+
+	for (; repeat > 0; repeat--)
+	  {
+	    result = memmem (haystack, m, needle, n);
+	    ASSERT (result == NULL);
+	  }
+      }
+    free (haystack);
+    free (needle);
   }
 
   return 0;