#include "clar_libgit2.h"

static void assert_found(const char *haystack, const char *needle, size_t expected_pos)

{

	cl_assert_equal_p(git__memmem(haystack, haystack ? strlen(haystack) : 0,

				      needle, needle ? strlen(needle) : 0),

			  haystack + expected_pos);

}

static void assert_absent(const char *haystack, const char *needle)

{

	cl_assert_equal_p(git__memmem(haystack, haystack ? strlen(haystack) : 0,

				      needle, needle ? strlen(needle) : 0),

			  NULL);

}

void test_core_memmem__found(void)

{

	assert_found("a", "a", 0);

	assert_found("ab", "a", 0);

	assert_found("ba", "a", 1);

	assert_found("aa", "a", 0);

	assert_found("aab", "aa", 0);

	assert_found("baa", "aa", 1);

	assert_found("dabc", "abc", 1);

	assert_found("abababc", "abc", 4);

}

void test_core_memmem__absent(void)

{

	assert_absent("a", "b");

	assert_absent("a", "aa");

	assert_absent("ba", "ab");

	assert_absent("ba", "ab");

	assert_absent("abc", "abcd");

	assert_absent("abcabcabc", "bcac");

}

void test_core_memmem__edgecases(void)

{

	assert_absent(NULL, NULL);

	assert_absent("a", NULL);

	assert_absent(NULL, "a");

	assert_absent("", "a");

	assert_absent("a", "");

}