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+/* Test of uN_strstr() functions.
+ Copyright (C) 2004, 2007-2015 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);
+ }
+}
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