add test-case for #1761

Signed-off-by: Steffen Jaeckel <jaeckel-floss@eyet-services.de>

tests/unittests/test_common.c

@@ -535,6 +535,28 @@ _lists_equal(GSList* a, GSList* b)
     return TRUE;
 }
 
+void
+prof_occurrences_of_large_message_tests(void** state)
+{
+    GSList* actual = NULL;
+    GSList* expected = NULL;
+    /* use this with the old implementation to create a segfault
+     *     const size_t haystack_sz = 1024 * 1024;
+     */
+    const size_t haystack_sz = 1024;
+    size_t haystack_cur = 0;
+    char* haystack = malloc(haystack_sz);
+    const char needle[] = "needle ";
+    while (haystack_sz - haystack_cur > sizeof(needle)) {
+        memcpy(&haystack[haystack_cur], needle, sizeof(needle) - 1);
+        expected = g_slist_append(expected, GINT_TO_POINTER(haystack_cur));
+        haystack_cur += sizeof(needle) - 1;
+    }
+    assert_true(_lists_equal(prof_occurrences("needle", haystack, 0, FALSE, &actual), expected));
+    g_slist_free(actual);
+    g_slist_free(expected);
+}
+
 void
 prof_partial_occurrences_tests(void** state)
 {

tests/unittests/test_common.h

@@ -31,5 +31,6 @@ void strip_quotes_strips_last(void** state);
 void strip_quotes_strips_both(void** state);
 void prof_partial_occurrences_tests(void** state);
 void prof_whole_occurrences_tests(void** state);
+void prof_occurrences_of_large_message_tests(void** state);
 void unique_filename_from_url_td(void** state);
 void format_call_external_argv_td(void** state);

tests/unittests/unittests.c

@@ -620,6 +620,7 @@ main(int argc, char* argv[])
 
         unit_test(prof_partial_occurrences_tests),
         unit_test(prof_whole_occurrences_tests),
+        unit_test(prof_occurrences_of_large_message_tests),
 
         unit_test(returns_no_commands),
         unit_test(returns_commands),