10 files changed, 583 insertions, 3 deletions

diff --git a/.travis.yml b/.travis.yml
index a1a17f61..b8699ec1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -23,6 +23,8 @@ before_script:
   - sudo ldconfig
 # installing sphinx, needed for documentation
   - sudo apt-get install python-sphinx
+# installing check, needed for unit tests
+  - sudo apt-get install check
 
 script:
   - mkdir build && cd build
diff --git a/CMakeLists.txt b/CMakeLists.txt
index f56cd67a..a5e1196b 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -53,3 +53,4 @@ add_subdirectory(core)
 add_subdirectory(testing)
 add_subdirectory(other)
 add_subdirectory(docs)
+add_subdirectory(auto_tests)
diff --git a/INSTALL.md b/INSTALL.md
index 8c7147fa..1ee1c66f 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -16,14 +16,14 @@
 Build dependencies:
 
 ```bash
-apt-get install build-essential libtool autotools-dev automake libconfig-dev ncurses-dev cmake checkinstall
+apt-get install build-essential libtool autotools-dev automake libconfig-dev ncurses-dev cmake checkinstall check
 ```
 
 On Fedora:
 
 ```bash
 yum groupinstall "Development Tools"
-yum install libtool autoconf automake libconfig-devel ncurses-devel cmake
+yum install libtool autoconf automake libconfig-devel ncurses-devel cmake check
 ```
 
 Note that `libconfig-dev` should be >= 1.4.
@@ -91,7 +91,7 @@ There are no binaries/executables going to /bin/ or /usr/bin/ now. Everything is
 <a name="homebrew" />
 ####Homebrew:
 ```
-brew install libtool automake autoconf libconfig libsodium cmake
+brew install libtool automake autoconf libconfig libsodium cmake check
 cmake .
 make
 ```
@@ -106,6 +106,7 @@ Grab the following packages:
   * http://www.cmake.org/
   * https://github.com/jedisct1/libsodium
   * http://www.hyperrealm.com/libconfig/
+  * http://check.sourceforge.net/
 
 Uncompress and install them all. Make sure to follow the README as the instructions change, but they all follow the same pattern below:
 
@@ -135,6 +136,7 @@ http://caiustheory.com/install-gcc-421-apple-build-56663-with-xcode-42
 You should install:
   - [MinGW](http://sourceforge.net/projects/mingw/)'s C compiler
   - [CMake](http://www.cmake.org/cmake/resources/software.html)
+  - [check] (http://check.sourceforge.net/)
 
 You have to [modify your PATH environment variable](http://www.computerhope.com/issues/ch000549.htm) so that it contains MinGW's bin folder path. With default settings, the bin folder is located at `C:\MinGW\bin`, which means that you would have to append `;C:\MinGW\bin` to the PATH variable.
 
diff --git a/auto_tests/CMakeLists.txt b/auto_tests/CMakeLists.txt
new file mode 100644
index 00000000..237dae1b
--- /dev/null
+++ b/auto_tests/CMakeLists.txt
@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 2.6.0)
+cmake_policy(SET CMP0011 NEW)
+
+include_directories(${CHECK_INCLUDE_DIRS})
+
+find_package(Check REQUIRED)
+include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/messenger_test.cmake)
+include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/friends_test.cmake)
diff --git a/auto_tests/cmake/friends_test.cmake b/auto_tests/cmake/friends_test.cmake
new file mode 100644
index 00000000..5c2d0fc6
--- /dev/null
+++ b/auto_tests/cmake/friends_test.cmake
@@ -0,0 +1,10 @@
+cmake_minimum_required(VERSION 2.6.0)
+project(friends_test C)
+set(exe_name friends_test)
+
+add_executable(${exe_name}
+    friends_test.c)
+
+linkCoreLibraries(${exe_name})
+add_dependencies(${exe_name} Check)
+target_link_libraries(${exe_name} check)
diff --git a/auto_tests/cmake/messenger_test.cmake b/auto_tests/cmake/messenger_test.cmake
new file mode 100644
index 00000000..084586bb
--- /dev/null
+++ b/auto_tests/cmake/messenger_test.cmake
@@ -0,0 +1,10 @@
+cmake_minimum_required(VERSION 2.6.0)
+project(messenger_test C)
+set(exe_name messenger_test)
+
+add_executable(${exe_name}
+    messenger_test.c)
+
+linkCoreLibraries(${exe_name})
+add_dependencies(${exe_name} Check)
+target_link_libraries(${exe_name} check)
diff --git a/auto_tests/friends_test.c b/auto_tests/friends_test.c
new file mode 100755
index 00000000..4f777ab5
--- /dev/null
+++ b/auto_tests/friends_test.c
@@ -0,0 +1,217 @@
+/* Unit testing for friend requests, statuses, and messages.
+ *  Purpose: Check that messaging functions actually do what
+ *          they're supposed to by setting up two local clients.
+ *
+ *  Design: (Subject to change.)
+ *      1. Parent sends a friend request, and waits for a response.
+ *          It it doesn't get one, it kills the child.
+ *      2. Child gets friend request, accepts, then waits for a status change.
+ *      3. The parent waits on a status change, killing the child if it takes
+ *          too long.
+ *      4. The child gets the status change, then sends a message. After that,
+ *          it returns. If if doesn't get the status change, it just loops forever.
+ *      5. After getting the status change, the parent waits for a message, on getting
+ *          one, it waits on the child to return, then returns 0.
+ *
+ *  Note about "waiting":
+ *      Wait time is decided by WAIT_COUNT and WAIT_TIME. c_sleep(WAIT_TIME) WAIT_COUNT
+ *      times. This is used both to ensure that we don't loop forever on a broken build,
+ *      and that we don't get too slow with messaging. The current time is 15 seconds. */
+
+#include "../core/friend_requests.h"
+#include "../core/Messenger.h"
+#include <assert.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <signal.h>
+#include <sys/wait.h>
+
+#define WAIT_COUNT 30
+#define WAIT_TIME 500
+
+/* first step, second step */
+#define FIRST_FLAG 0x1
+#define SECOND_FLAG 0x2
+
+/* ensure that we sleep in milliseconds */
+#ifdef WIN32
+#define c_sleep(x) Sleep(x)
+#else
+#define c_sleep(x) usleep(1000*x)
+#endif
+
+uint8_t *parent_id = NULL;
+uint8_t *child_id = NULL;
+
+pid_t child_pid = 0;
+int request_flags = 0;
+
+void do_tox(void)
+{
+    static int dht_on = 0;
+
+    if(!dht_on && DHT_isconnected()) {
+        dht_on = 1;
+    } else if(dht_on && !DHT_isconnected()) {
+        dht_on = 0;
+    }
+
+    doMessenger();
+}
+
+void parent_confirm_message(int num, uint8_t *data, uint16_t length)
+{
+    puts("OK");
+    request_flags |= SECOND_FLAG;
+}
+
+void parent_confirm_status(int num, USERSTATUS_KIND status, uint8_t *data, uint16_t length)
+{
+    puts("OK");
+    request_flags |= FIRST_FLAG;
+}
+
+int parent_friend_request(void)
+{
+    char *message = "Watson, come here, I need you.";
+    int len = strlen(message);
+    int i = 0;
+
+    fputs("Sending child request.", stdout);
+    fflush(stdout);
+
+    m_addfriend(child_id, (uint8_t *)message, len);
+
+    /* wait on the status change */
+    for(i = 0; i < WAIT_COUNT; i++) {
+        do_tox();
+        if(request_flags & FIRST_FLAG)
+            break;
+        fputs(".", stdout);
+        fflush(stdout);
+        c_sleep(WAIT_TIME);
+    }
+
+    if(!(request_flags & FIRST_FLAG)) {
+        fputs("\nfriends_test: The child took to long to respond!\n"
+              "Friend requests may be broken, failing build!\n", stderr);
+        kill(child_pid, SIGKILL);
+        return -1;
+    }
+
+    return 0;
+}
+
+void child_got_request(uint8_t *public_key, uint8_t *data, uint16_t length)
+{
+    fputs("OK\nsending status to parent", stdout);
+    fflush(stdout);
+    m_addfriend_norequest(public_key);
+    request_flags |= FIRST_FLAG;
+}
+
+void child_got_statuschange(int friend_num, USERSTATUS_KIND status, uint8_t *string, uint16_t length)
+{
+    request_flags |= SECOND_FLAG;
+}
+
+int parent_wait_for_message(void)
+{
+    int i = 0;
+
+    fputs("Parent waiting for message.", stdout);
+    fflush(stdout);
+
+    for(i = 0; i < WAIT_COUNT; i++) {
+        do_tox();
+        if(request_flags & SECOND_FLAG)
+            break;
+        fputs(".", stdout);
+        fflush(stdout);
+        c_sleep(WAIT_TIME);
+    }
+
+    if(!(request_flags & SECOND_FLAG)) {
+        fputs("\nParent hasn't recieved the message yet!\n"
+              "Messaging may be broken, failing the build!\n", stderr);
+        kill(child_pid, SIGKILL);
+        return -1;
+    }
+
+    return 0;
+}
+
+void cleanup(void)
+{
+    munmap(parent_id, crypto_box_PUBLICKEYBYTES);
+    munmap(child_id, crypto_box_PUBLICKEYBYTES);
+    puts("============= END TEST =============");
+}
+
+int main(int argc, char *argv[])
+{
+    puts("=========== FRIENDS_TEST ===========");
+
+    /* set up the global memory */
+    parent_id = mmap(NULL, crypto_box_PUBLICKEYBYTES, PROT_READ | PROT_WRITE,
+                        MAP_SHARED | MAP_ANONYMOUS, -1, 0);
+    child_id = mmap(NULL, crypto_box_PUBLICKEYBYTES, PROT_READ | PROT_WRITE,
+                        MAP_SHARED | MAP_ANONYMOUS, -1, 0);
+
+    fputs("friends_test: Starting test...\n", stdout);
+    if((child_pid = fork()) == 0) {
+        /* child */
+        int i = 0;
+        char *message = "Y-yes Mr. Watson?";
+
+        initMessenger();
+        Messenger_save(child_id);
+        msync(child_id, crypto_box_PUBLICKEYBYTES, MS_SYNC);
+
+        m_callback_friendrequest(child_got_request);
+        m_callback_userstatus(child_got_statuschange);
+
+        /* wait on the friend request */
+       while(!(request_flags & FIRST_FLAG))
+            do_tox();
+
+        /* wait for the status change */
+        while(!(request_flags & SECOND_FLAG))
+            do_tox();
+
+        for(i = 0; i < 6; i++) {
+            /* send the message six times, just to be sure */
+            m_sendmessage(0, (uint8_t *)message, strlen(message));
+            do_tox();
+        }
+
+        return 0;
+    }
+
+    /* parent */
+    if(atexit(cleanup) != 0) {
+        fputs("friends_test: atexit() failed!\nFailing build...\n", stderr);
+        kill(child_pid, SIGKILL);
+        return -1;
+    }
+
+    msync(parent_id, crypto_box_PUBLICKEYBYTES, MS_SYNC);
+    m_callback_userstatus(parent_confirm_status);
+    m_callback_friendmessage(parent_confirm_message);
+
+    /* hacky way to give the child time to set up */
+    c_sleep(50);
+
+    initMessenger();
+    Messenger_save(parent_id);
+
+    if(parent_friend_request() == -1)
+        return -1;
+
+    if(parent_wait_for_message() == -1)
+        return -1;
+
+    wait(NULL);
+    fputs("friends_test: Build passed!\n", stdout);
+    return 0;
+}
diff --git a/auto_tests/messenger_test.c b/auto_tests/messenger_test.c
new file mode 100644
index 00000000..deed498f
--- /dev/null
+++ b/auto_tests/messenger_test.c
@@ -0,0 +1,279 @@
+/* unit tests for /core/Messenger.c
+ *  Design:
+ *      Just call every non-static function in Messenger.c, checking that
+ *      they return as they should with check calls. "Bad" calls of the type
+ *      function(bad_data, good_length) are _not_ checked for, this type
+ *      of call is the fault of the client code.
+ *
+ *  Note:
+ *      None of the functions here test things that rely on the network, i.e.
+ *      checking that status changes are recieved, messages can be sent, etc.
+ *      All of that is done in a separate test, with two local clients running. */
+
+#include "../core/Messenger.h"
+#include <sys/types.h>
+#include <stdint.h>
+#include <string.h>
+#include <check.h>
+
+#define REALLY_BIG_NUMBER ((1) << (sizeof(uint16_t) * 7))
+#define STRINGS_EQUAL(X, Y) (strcmp(X, Y) == 0)
+
+char *friend_id_str = "1145e295b0fbdc9330d5d74ec204a8bf23c315106040b4035d0d358d07ee3f7d";
+
+/* in case we need more than one ID for a test */
+char *good_id_a_str = "DB9B569D14850ED8364C3744CAC2C8FF78985D213E980C7C508D0E91E8E45441";
+char *good_id_b_str = "d3f14b6d384d8f5f2a66cff637e69f28f539c5de61bc29744785291fa4ef4d64";
+
+char *bad_id_str =    "9B569D14ff637e69f2";
+
+unsigned char *friend_id = NULL;
+unsigned char *good_id_a = NULL;
+unsigned char *good_id_b = NULL;
+unsigned char *bad_id    = NULL;
+
+int friend_id_num = 0;
+
+unsigned char * hex_string_to_bin(char hex_string[])
+{
+    size_t len = strlen(hex_string);
+    unsigned char *val = calloc(1, len);
+    char *pos = hex_string;
+    int i = 0;
+    for(i = 0; i < len; ++i, pos+=2)
+        sscanf(pos,"%2hhx",&val[i]);
+    return val;
+}
+
+START_TEST(test_m_sendmesage)
+{
+    char *message = "h-hi :3";
+    int good_len = strlen(message);
+    int bad_len = MAX_DATA_SIZE;
+
+
+    ck_assert(m_sendmessage(-1, (uint8_t *)message, good_len) == 0);
+    ck_assert(m_sendmessage(REALLY_BIG_NUMBER, (uint8_t *)message, good_len) == 0);
+    ck_assert(m_sendmessage(17, (uint8_t *)message, good_len) == 0);
+    ck_assert(m_sendmessage(friend_id_num, (uint8_t *)message, bad_len) == 0);
+}
+END_TEST
+
+START_TEST(test_m_get_userstatus_size)
+{
+    int rc = 0;
+    ck_assert_msg((m_get_userstatus_size(-1) == -1),
+                "m_get_userstatus_size did NOT catch an argument of -1");
+    ck_assert_msg((m_get_userstatus_size(REALLY_BIG_NUMBER) == -1),
+            "m_get_userstatus_size did NOT catch the following argument: %d\n",
+                                                            REALLY_BIG_NUMBER);
+    rc = m_get_userstatus_size(friend_id_num);
+
+    /* this WILL error if the original m_addfriend_norequest() failed */
+    ck_assert_msg((rc > 0 && rc <= MAX_USERSTATUS_LENGTH),
+        "m_get_userstatus_size is returning out of range values!\n"
+        "(this can be caused by the error of m_addfriend_norequest"
+        " in the beginning of the suite)\n");
+}
+END_TEST
+
+START_TEST(test_m_set_userstatus)
+{
+    char *status = "online!";
+    uint16_t good_length = strlen(status);
+    uint16_t bad_length = REALLY_BIG_NUMBER;
+
+    if(m_set_userstatus(USERSTATUS_KIND_ONLINE,
+                (uint8_t *)status, bad_length) != -1)
+        ck_abort_msg("m_set_userstatus did NOT catch the following length: %d\n",
+                                                            REALLY_BIG_NUMBER);
+
+    if((m_set_userstatus(USERSTATUS_KIND_RETAIN,
+                (uint8_t *)status, good_length)) != 0)
+        ck_abort_msg("m_set_userstatus did NOT return 0 on the following length: %d\n"
+                     "MAX_USERSTATUS_LENGTH: %d\n", good_length, MAX_USERSTATUS_LENGTH);
+}
+END_TEST
+
+START_TEST(test_m_friendstatus)
+{
+    ck_assert_msg((m_friendstatus(-1) == NOFRIEND),
+        "m_friendstatus did NOT catch an argument of -1.\n");
+    ck_assert_msg((m_friendstatus(REALLY_BIG_NUMBER) == NOFRIEND),
+        "m_friendstatus did NOT catch an argument of %d.\n",
+                                        REALLY_BIG_NUMBER);
+}
+END_TEST
+
+START_TEST(test_m_delfriend)
+{
+    ck_assert_msg((m_delfriend(-1) == -1),
+        "m_delfriend did NOT catch an argument of -1\n");
+    ck_assert_msg((m_delfriend(REALLY_BIG_NUMBER) == -1),
+        "m_delfriend did NOT catch the following number: %d\n",
+                                            REALLY_BIG_NUMBER);
+}
+END_TEST
+
+START_TEST(test_m_addfriend)
+{
+    char *good_data = "test";
+    char *bad_data = "";
+
+    int good_len = strlen(good_data);
+    int bad_len = strlen(bad_data);
+    int really_bad_len = (MAX_DATA_SIZE - crypto_box_PUBLICKEYBYTES
+                     - crypto_box_NONCEBYTES - crypto_box_BOXZEROBYTES
+                                         + crypto_box_ZEROBYTES + 100);
+
+    if(m_addfriend((uint8_t *)friend_id, (uint8_t *)good_data, really_bad_len) != FAERR_TOOLONG)
+        ck_abort_msg("m_addfriend did NOT catch the following length: %d\n", really_bad_len);
+
+    /* this will error if the original m_addfriend_norequest() failed */
+    if(m_addfriend((uint8_t *)friend_id, (uint8_t *)good_data, good_len) != FAERR_ALREADYSENT)
+        ck_abort_msg("m_addfriend did NOT catch adding a friend we already have.\n"
+                     "(this can be caused by the error of m_addfriend_norequest in"
+                     " the beginning of the suite)\n");
+
+    if(m_addfriend((uint8_t *)good_id_b, (uint8_t *)bad_data, bad_len) != FAERR_NOMESSAGE)
+        ck_abort_msg("m_addfriend did NOT catch the following length: %d\n", bad_len);
+
+    /* this should REALLY error */
+    if(m_addfriend((uint8_t *)bad_id, (uint8_t *)good_data, good_len) >= 0)
+        ck_abort_msg("The following ID passed through "
+              "m_addfriend without an error:\n'%s'\n", bad_id_str);
+}
+END_TEST
+
+START_TEST(test_setname)
+{
+    char *good_name = "consensualCorn";
+    int good_length = strlen(good_name);
+    int bad_length = REALLY_BIG_NUMBER;
+
+    if(setname((uint8_t *)good_name, bad_length) != -1)
+        ck_abort_msg("setname() did NOT error on %d as a length argument!\n",
+                                                                bad_length);
+    if(setname((uint8_t *)good_name, good_length) != 0)
+        ck_abort_msg("setname() did NOT return 0 on good arguments!\n");
+}
+END_TEST
+
+START_TEST(test_getself_name)
+{
+    char *nickname = "testGallop";
+    int len = strlen(nickname);
+    char nick_check[len];
+
+    setname((uint8_t *)nickname, len);
+    getself_name((uint8_t *)nick_check);
+
+    ck_assert_msg((!STRINGS_EQUAL(nickname, nick_check)),
+        "getself_name failed to return the known name!\n"
+        "known name: %s\nreturned: %s\n", nickname, nick_check);
+}
+END_TEST
+
+/* this test is excluded for now, due to lack of a way
+ *  to set a friend's status for now.
+ *  ideas:
+ *      if we have access to the friends list, we could
+ *      just add a status manually ourselves. */
+/*
+START_TEST(test_m_copy_userstatus)
+{
+    assert(m_copy_userstatus(-1, buf, MAX_USERSTATUS_LENGTH) == -1);
+    assert(m_copy_userstatus(REALLY_BIG_NUMBER, buf, MAX_USERSTATUS_LENGTH) == -1);
+    m_copy_userstatus(friend_id_num, buf, MAX_USERSTATUS_LENGTH + 6);
+
+    assert(STRINGS_EQUAL(name_buf, friend_id_status));
+}
+END_TEST
+*/
+
+/* this test is excluded for now, due to lack of a way
+ *  to set a friend's nickname for now.
+ *  ideas:
+ *      if we have access to the friends list, we could
+ *      just add a name manually ourselves. */
+/*
+START_TEST(test_getname)
+{
+    uint8_t name_buf[MAX_NAME_LENGTH];
+
+    assert(getname(-1, name_buf) == -1);
+    assert(getname(REALLY_BIG_NUMBER, name_buf) == -1);
+
+    getname(friend_id_num, name_buf);
+    assert(name_buf[MAX_NAME_LENGTH] == '\0'); // something like this
+}
+END_TEST
+*/
+
+Suite *messenger_suite(void)
+{
+    Suite *s = suite_create("Messenger");
+
+    TCase *userstatus_size = tcase_create("userstatus_size");
+    TCase *set_userstatus = tcase_create("set_userstatus");
+    TCase *send_message = tcase_create("send_message");
+    TCase *friendstatus = tcase_create("friendstatus");
+    TCase *getself_name = tcase_create("getself_name");
+    TCase *delfriend = tcase_create("delfriend");
+    TCase *addfriend = tcase_create("addfriend");
+    TCase *setname = tcase_create("setname");
+
+    tcase_add_test(userstatus_size, test_m_get_userstatus_size);
+    tcase_add_test(set_userstatus, test_m_set_userstatus);
+    tcase_add_test(friendstatus, test_m_friendstatus);
+    tcase_add_test(getself_name, test_getself_name);
+    tcase_add_test(send_message, test_m_sendmesage);
+    tcase_add_test(delfriend, test_m_delfriend);
+    tcase_add_test(addfriend, test_m_addfriend);
+    tcase_add_test(setname, test_setname);
+
+    suite_add_tcase(s, userstatus_size);
+    suite_add_tcase(s, set_userstatus);
+    suite_add_tcase(s, friendstatus);
+    suite_add_tcase(s, send_message);
+    suite_add_tcase(s, getself_name);
+    suite_add_tcase(s, delfriend);
+    suite_add_tcase(s, addfriend);
+    suite_add_tcase(s, setname);
+
+    return s;
+}
+
+int main(int argc, char *argv[])
+{
+    Suite *messenger = messenger_suite();
+    SRunner *test_runner = srunner_create(messenger);
+    int number_failed = 0;
+
+    friend_id = hex_string_to_bin(friend_id_str);
+    good_id_a = hex_string_to_bin(good_id_a_str);
+    good_id_b = hex_string_to_bin(good_id_b_str);
+    bad_id    = hex_string_to_bin(bad_id_str);
+
+    /* setup a default friend and friendnum */
+    if(m_addfriend_norequest((uint8_t *)friend_id) < 0)
+        fputs("m_addfriend_norequest() failed on a valid ID!\n"
+              "this was CRITICAL to the test, and the build WILL fail.\n"
+              "the tests will continue now...\n\n", stderr);
+
+    if((friend_id_num = getfriend_id((uint8_t *)friend_id)) < 0)
+        fputs("getfriend_id() failed on a valid ID!\n"
+              "this was CRITICAL to the test, and the build WILL fail.\n"
+              "the tests will continue now...\n\n", stderr);
+
+    srunner_run_all(test_runner, CK_NORMAL);
+    number_failed = srunner_ntests_failed(test_runner);
+
+    srunner_free(test_runner);
+    free(friend_id);
+    free(good_id_a);
+    free(good_id_b);
+    free(bad_id);
+
+    return number_failed;
+}
diff --git a/auto_tests/run_tests b/auto_tests/run_tests
new file mode 100755
index 00000000..4448b2e2
--- /dev/null
+++ b/auto_tests/run_tests
@@ -0,0 +1,5 @@
+#!/bin/bash
+# run_tests - run the current tests for tox core
+set -e
+
+./messenger_test && ./friends_test 
diff --git a/cmake/FindCheck.cmake b/cmake/FindCheck.cmake
new file mode 100644
index 00000000..e9e7f4d1
--- /dev/null
+++ b/cmake/FindCheck.cmake
@@ -0,0 +1,46 @@
+# - Try to find the CHECK libraries
+#  Once done this will define
+#
+#  CHECK_FOUND - system has check
+#  CHECK_INCLUDE_DIR - the check include directory
+#  CHECK_LIBRARIES - check library
+#  
+#  Copyright (c) 2007 Daniel Gollub <dgollub@suse.de>
+#  Copyright (c) 2007 Bjoern Ricks  <b.ricks@fh-osnabrueck.de>
+#
+#  Redistribution and use is allowed according to the terms of the New
+#  BSD license.
+#  For details see the accompanying COPYING-CMAKE-SCRIPTS file.
+
+
+INCLUDE( FindPkgConfig )
+
+# Take care about check.pc settings
+PKG_SEARCH_MODULE( CHECK check )
+
+# Look for CHECK include dir and libraries
+IF( NOT CHECK_FOUND )
+
+        FIND_PATH( CHECK_INCLUDE_DIR check.h )
+
+        FIND_LIBRARY( CHECK_LIBRARIES NAMES check )
+
+        IF ( CHECK_INCLUDE_DIR AND CHECK_LIBRARIES )
+                SET( CHECK_FOUND 1 )
+                IF ( NOT Check_FIND_QUIETLY )
+                        MESSAGE ( STATUS "Found CHECK: ${CHECK_LIBRARIES}" )
+                ENDIF ( NOT Check_FIND_QUIETLY )
+        ELSE ( CHECK_INCLUDE_DIR AND CHECK_LIBRARIES )
+                IF ( Check_FIND_REQUIRED )
+                        MESSAGE( FATAL_ERROR "Could NOT find CHECK" )
+                ELSE ( Check_FIND_REQUIRED )
+                        IF ( NOT Check_FIND_QUIETLY )
+                                MESSAGE( STATUS "Could NOT find CHECK" )        
+                        ENDIF ( NOT Check_FIND_QUIETLY )
+                ENDIF ( Check_FIND_REQUIRED )
+        ENDIF ( CHECK_INCLUDE_DIR AND CHECK_LIBRARIES )
+ENDIF( NOT CHECK_FOUND )
+
+# Hide advanced variables from CMake GUIs
+MARK_AS_ADVANCED( CHECK_INCLUDE_DIR CHECK_LIBRARIES )
+