uN_strstr: New unit tests.

* modules/unistr/u8-strstr-tests: New file.
* modules/unistr/u16-strstr-tests: New file.
* modules/unistr/u32-strstr-tests: New file.
* tests/unistr/test-u-strstr.h: New file, based on tests/test-strstr.c.
* tests/unistr/test-u8-strstr.c: New file.
* tests/unistr/test-u16-strstr.c: New file.
* tests/unistr/test-u32-strstr.c: New file.

4 files changed, 354 insertions, 0 deletions

diff --git a/tests/unistr/test-u-strstr.h b/tests/unistr/test-u-strstr.h
new file mode 100644
index 0000000000..6265b3bd4b
--- /dev/null
+++ b/tests/unistr/test-u-strstr.h
@@ -0,0 +1,210 @@
+/* Test of uN_strstr() functions.
+   Copyright (C) 2004, 2007-2011 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+static void
+test_u_strstr (void)
+{
+  {
+    const UNIT input[] = { 'f', 'o', 'o', 0 };
+    const UNIT needle[] = { 0 };
+    const UNIT *result = U_STRSTR (input, needle);
+    ASSERT (result == input);
+  }
+
+  {
+    const UNIT input[] = { 'f', 'o', 'o', 0 };
+    const UNIT needle[] = { 'o', 0 };
+    const UNIT *result = U_STRSTR (input, needle);
+    ASSERT (result == input + 1);
+  }
+
+  {
+    const UNIT input[] =
+      { 'A', 'B', 'C', ' ', 'A', 'B', 'C', 'D', 'A', 'B', ' ', 'A', 'B', 'C',
+        'D', 'A', 'B', 'C', 'D', 'A', 'B', 'D', 'E', 0
+      };
+    const UNIT needle[] = { 'A', 'B', 'C', 'D', 'A', 'B', 'D', 0 };
+    const UNIT *result = U_STRSTR (input, needle);
+    ASSERT (result == input + 15);
+  }
+
+  {
+    const UNIT input[] =
+      { 'A', 'B', 'C', ' ', 'A', 'B', 'C', 'D', 'A', 'B', ' ', 'A', 'B', 'C',
+        'D', 'A', 'B', 'C', 'D', 'A', 'B', 'D', 'E', 0
+      };
+    const UNIT needle[] = { 'A', 'B', 'C', 'D', 'A', 'B', 'E', 0 };
+    const UNIT *result = U_STRSTR (input, needle);
+    ASSERT (result == NULL);
+  }
+
+  {
+    const UNIT input[] =
+      { 'A', 'B', 'C', ' ', 'A', 'B', 'C', 'D', 'A', 'B', ' ', 'A', 'B', 'C',
+        'D', 'A', 'B', 'C', 'D', 'A', 'B', 'D', 'E', 0
+      };
+    const UNIT needle[] = { 'A', 'B', 'C', 'D', 'A', 'B', 'C', 'D', 0 };
+    const UNIT *result = U_STRSTR (input, needle);
+    ASSERT (result == input + 11);
+  }
+
+  /* Check that a long periodic needle does not cause false positives.  */
+  {
+    const UNIT input[] =
+      { 'F', '_', 'B', 'D', '_', 'C', 'E', '_', 'B', 'D', '_', 'E', 'F',
+        '_', 'B', 'F', '_', 'B', 'D', '_', 'E', 'F', '_', 'B', 'F',
+        '_', 'B', 'D', '_', 'E', 'F', '_', 'B', 'F', '_', 'B', 'D',
+        '_', 'E', 'F', '_', 'B', 'F', '_', 'B', 'D', '_', 'C', '3',
+        '_', '8', '8', '_', '2', '0', '_', 'E', 'F', '_', 'B', 'F',
+        '_', 'B', 'D', '_', 'E', 'F', '_', 'B', 'F', '_', 'B', 'D',
+        '_', 'E', 'F', '_', 'B', 'F', '_', 'B', 'D', '_', 'C', '3',
+        '_', 'A', '7', '_', '2', '0', '_', 'E', 'F', '_', 'B', 'F',
+        '_', 'B', 'D', 0
+      };
+    const UNIT needle[] =
+      { '_', 'E', 'F', '_', 'B', 'F', '_', 'B', 'D', '_', 'E', 'F',
+        '_', 'B', 'F', '_', 'B', 'D', '_', 'E', 'F', '_', 'B', 'F',
+        '_', 'B', 'D', '_', 'E', 'F', '_', 'B', 'F', '_', 'B', 'D',
+        '_', 'E', 'F', '_', 'B', 'F', '_', 'B', 'D', 0
+      };
+    const UNIT *result = U_STRSTR (input, needle);
+    ASSERT (result == NULL);
+  }
+  {
+    const UNIT input[] =
+      { 'F', '_', 'B', 'D', '_', 'C', 'E', '_', 'B', 'D', '_', 'E', 'F',
+        '_', 'B', 'F', '_', 'B', 'D', '_', 'E', 'F', '_', 'B', 'F',
+        '_', 'B', 'D', '_', 'E', 'F', '_', 'B', 'F', '_', 'B', 'D',
+        '_', 'E', 'F', '_', 'B', 'F', '_', 'B', 'D', '_', 'C', '3',
+        '_', '8', '8', '_', '2', '0', '_', 'E', 'F', '_', 'B', 'F',
+        '_', 'B', 'D', '_', 'E', 'F', '_', 'B', 'F', '_', 'B', 'D',
+        '_', 'E', 'F', '_', 'B', 'F', '_', 'B', 'D', '_', 'C', '3',
+        '_', 'A', '7', '_', '2', '0', '_', 'E', 'F', '_', 'B', 'F',
+        '_', 'B', 'D', '_', 'D', 'A', '_', 'B', '5', '_', 'C', '2',
+        '_', 'A', '6', '_', '2', '0', '_', 'E', 'F', '_', 'B', 'F',
+        '_', 'B', 'D', '_', 'E', 'F', '_', 'B', 'F', '_', 'B', 'D',
+        '_', 'E', 'F', '_', 'B', 'F', '_', 'B', 'D', '_', 'E', 'F',
+        '_', 'B', 'F', '_', 'B', 'D', '_', 'E', 'F', '_', 'B', 'F',
+        '_', 'B', 'D', 0
+      };
+    const UNIT needle[] =
+      { '_', 'E', 'F', '_', 'B', 'F', '_', 'B', 'D', '_', 'E', 'F',
+        '_', 'B', 'F', '_', 'B', 'D', '_', 'E', 'F', '_', 'B', 'F',
+        '_', 'B', 'D', '_', 'E', 'F', '_', 'B', 'F', '_', 'B', 'D',
+        '_', 'E', 'F', '_', 'B', 'F', '_', 'B', 'D', 0
+      };
+    const UNIT *result = U_STRSTR (input, needle);
+    ASSERT (result == input + 115);
+  }
+
+  /* Check that a very long haystack is handled quickly if the needle is
+     short and occurs near the beginning.  */
+  {
+    size_t repeat = 10000;
+    size_t m = 1000000;
+    const UNIT needle[] =
+      { 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A',
+        'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A',
+        'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A',
+        'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A',
+        'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A',
+        'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A',
+        'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A',
+        'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A',
+        'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A',
+        'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 0
+      };
+    UNIT *haystack = (UNIT *) malloc ((m + 1) * sizeof (UNIT));
+    if (haystack != NULL)
+      {
+        size_t i;
+
+        haystack[0] = 'B';
+        for (i = 1; i < m; i++)
+          haystack[i] = 'A';
+        haystack[m] = '\0';
+
+        for (; repeat > 0; repeat--)
+          {
+            ASSERT (U_STRSTR (haystack, needle) == haystack + 1);
+          }
+
+        free (haystack);
+      }
+  }
+
+  /* Check that a very long needle is discarded quickly if the haystack is
+     short.  */
+  {
+    size_t repeat = 10000;
+    size_t m = 1000000;
+    const UNIT haystack[] =
+      { 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A',
+        'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A',
+        'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A',
+        'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A',
+        'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A', 'B',
+        'A', 'B', 'A', 'B', 'A', 'B', 'A', 'B', 'A', 'B', 'A', 'B', 'A', 'B',
+        'A', 'B', 'A', 'B', 'A', 'B', 'A', 'B', 'A', 'B', 'A', 'B', 'A', 'B',
+        'A', 'B', 'A', 'B', 'A', 'B', 'A', 'B', 'A', 'B', 'A', 'B', 'A', 'B',
+        'A', 'B', 'A', 'B', 'A', 'B', 'A', 'B', 'A', 'B', 'A', 'B', 'A', 'B',
+        'A', 'B', 'A', 'B', 'A', 'B', 'A', 'B', 'A', 'B', 0
+      };
+    UNIT *needle = (UNIT *) malloc ((m + 1) * sizeof (UNIT));
+    if (needle != NULL)
+      {
+        size_t i;
+
+        for (i = 0; i < m; i++)
+          needle[i] = 'A';
+        needle[m] = '\0';
+
+        for (; repeat > 0; repeat--)
+          {
+            ASSERT (U_STRSTR (haystack, needle) == NULL);
+          }
+
+        free (needle);
+      }
+  }
+
+  /* Check that the asymptotic worst-case complexity is not quadratic.  */
+  {
+    size_t m = 1000000;
+    UNIT *haystack = (UNIT *) malloc ((2 * m + 2) * sizeof (UNIT));
+    UNIT *needle = (UNIT *) malloc ((m + 2) * sizeof (UNIT));
+    if (haystack != NULL && needle != NULL)
+      {
+        size_t i;
+        const UNIT *result;
+
+        for (i = 0; i < 2 * m; i++)
+          haystack[i] = 'A';
+        haystack[2 * m] = 'B';
+        haystack[2 * m + 1] = 0;
+
+        for (i = 0; i < m; i++)
+          needle[i] = 'A';
+        needle[m] = 'B';
+        needle[m + 1] = 0;
+
+        result = U_STRSTR (haystack, needle);
+        ASSERT (result == haystack + m);
+      }
+    free (needle);
+    free (haystack);
+  }
+}
diff --git a/tests/unistr/test-u16-strstr.c b/tests/unistr/test-u16-strstr.c
new file mode 100644
index 0000000000..bc792b9562
--- /dev/null
+++ b/tests/unistr/test-u16-strstr.c
@@ -0,0 +1,47 @@
+/* Test of u16_strstr() function.
+   Copyright (C) 2011 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* Written by Pádraig Brady <P@draigBrady.com>, 2011.  */
+
+#include <config.h>
+
+#include "unistr.h"
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <signal.h> /* For signal.  */
+#include <unistd.h> /* For alarm.  */
+
+#include "macros.h"
+
+#define UNIT uint16_t
+#define U_STRSTR u16_strstr
+#include "test-u-strstr.h"
+
+int
+main (void)
+{
+#if HAVE_DECL_ALARM
+  /* Declare failure if test takes too long, by using default abort
+     caused by SIGALRM.  */
+  signal (SIGALRM, SIG_DFL);
+  alarm (5);
+#endif
+
+  test_u_strstr ();
+
+  return 0;
+}
diff --git a/tests/unistr/test-u32-strstr.c b/tests/unistr/test-u32-strstr.c
new file mode 100644
index 0000000000..6dc412283e
--- /dev/null
+++ b/tests/unistr/test-u32-strstr.c
@@ -0,0 +1,47 @@
+/* Test of u32_strstr() function.
+   Copyright (C) 2011 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* Written by Pádraig Brady <P@draigBrady.com>, 2011.  */
+
+#include <config.h>
+
+#include "unistr.h"
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <signal.h> /* For signal.  */
+#include <unistd.h> /* For alarm.  */
+
+#include "macros.h"
+
+#define UNIT uint32_t
+#define U_STRSTR u32_strstr
+#include "test-u-strstr.h"
+
+int
+main (void)
+{
+#if HAVE_DECL_ALARM
+  /* Declare failure if test takes too long, by using default abort
+     caused by SIGALRM.  */
+  signal (SIGALRM, SIG_DFL);
+  alarm (5);
+#endif
+
+  test_u_strstr ();
+
+  return 0;
+}
diff --git a/tests/unistr/test-u8-strstr.c b/tests/unistr/test-u8-strstr.c
new file mode 100644
index 0000000000..b51cfa4a52
--- /dev/null
+++ b/tests/unistr/test-u8-strstr.c
@@ -0,0 +1,50 @@
+/* Test of u8_strstr() function.
+   Copyright (C) 2011 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* Written by Pádraig Brady <P@draigBrady.com>, 2011.  */
+
+#include <config.h>
+
+#include "unistr.h"
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <signal.h> /* For signal.  */
+#include <unistd.h> /* For alarm.  */
+
+#include "macros.h"
+
+#define UNIT uint8_t
+#define U_STRSTR u8_strstr
+#include "test-u-strstr.h"
+
+int
+main (void)
+{
+#if HAVE_DECL_ALARM
+  /* Declare failure if test takes too long, by using default abort
+     caused by SIGALRM.  Note since we defer to strstr() in this
+     case, we're assuming that we're running this test on the
+     same system that we did the check to ensure it has linear
+     performance characteristics.  */
+  signal (SIGALRM, SIG_DFL);
+  alarm (5);
+#endif
+
+  test_u_strstr ();
+
+  return 0;
+}