Add C ABI test for prevent C ABI breakage

Signed-off-by: Ernesto Castellotti <erny.castell@gmail.com>

CMakeLists.txt

@@ -1,7 +1,8 @@
 cmake_minimum_required(VERSION 2.8.9)
 
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/cmake-d")
-project(Open-USB-Extreme D)
+project(Open-USB-Extreme C D)
+enable_testing()
 
 file(GLOB SOURCES "lib/*.d")
 file(GLOB HEADERS "include/*.h" "include/*.di")
@@ -11,9 +12,14 @@ include_directories(include)
 
 set(CMAKE_D_FLAGS "${CMAKE_D_FLAGS} -betterC -O -release -L-rpath=.")
 add_library(${PROJECT_NAME} SHARED ${SOURCES})
+
 add_executable(open-usbextreme-example ${EXAMPLE_SOURCES})
 target_link_libraries(open-usbextreme-example ${PROJECT_NAME})
 
+add_executable(cabitest "tests/cabitest.c")
+target_link_libraries(cabitest ${PROJECT_NAME})
+add_test (NAME CABI_TEST COMMAND cabitest /home/erny/Desktop/ul.cfg)
+
 install(TARGETS ${PROJECT_NAME}
         LIBRARY DESTINATION lib
 )

tests/cabitest.c

@@ -0,0 +1,40 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <usbextreme.h>
+
+int main(int argc, char *argv[]) {
+    if (argc < 2) {
+        printf("Usage: open-usbextreme-example <path/to/ul.cfg>\n");
+        return 1;
+    }
+
+    FILE *f = fopen(argv[1], "rb");
+    fseek(f, 0, SEEK_END);
+    long fsize = ftell(f);
+
+    if (fsize <= 0) {
+        return 1;
+    }
+
+    unsigned long size = *(unsigned long*) &fsize;
+    fseek(f, 0, SEEK_SET);
+
+    void *data = malloc(size + 1);
+    fread(data, size, 1, f);
+    fclose(f);
+
+    usb_extreme_headers headers;
+
+    if(oue_read_headers(&headers, data, size) <= 0) {
+       return 1;
+    }
+
+    usb_extreme_filestat filestats[10];
+    int nstats = oue_read(filestats, headers, 10);
+
+    int i;
+    for(i = 0; i < nstats; i++) {
+        printf("Game name [%d]: %s\n", filestats[i].offset, filestats[i].name);
+    }
+    return 0;
+}