(#885) Introduce system/file module

CMakeLists.txt

@@ -154,6 +154,8 @@ add_executable(nothing
   src/game/level/level_editor/layer.c
   src/game/level/level_editor/label_layer.c
   src/game/level/level_editor/label_layer.h
+  src/system/file.h
+  src/system/file.c
 )
 target_link_libraries(nothing ${SDL2_LIBRARIES} system ebisp)
 

src/system/file.c

@@ -0,0 +1,20 @@
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef __linux__
+#include <sys/stat.h>
+#include <sys/types.h>
+#endif // __linux__
+
+#include "system/stacktrace.h"
+#include "file.h"
+
+time_t last_modified(const char *filepath)
+{
+    trace_assert(filepath);
+
+#ifdef __linux__
+    struct stat attr;
+    stat(filepath, &attr);
+    return attr.st_mtime;
+#endif // __linux__
+}

src/system/file.h

@@ -0,0 +1,8 @@
+#ifndef FILE_H_
+#define FILE_H_
+
+#include <time.h>
+
+time_t last_modified(const char *filepath);
+
+#endif  // FILE_H_