Resolving issues in merge request

system_calls.h
line 38: Fixed return type for syscall_filesize
syscall_filesize.c
line 12..14: Rewrote to fix undefined function and to condense the code
line 14: Added function to search for files in memory
syscall.c
line 77: Added file_search function skeleton
syscall.h
line 6: Added file_search declaration

userprog/syscall.c

@@ -84,3 +84,9 @@ syscall_handler (struct intr_frame *f UNUSED)
     thread_exit ();
   }
 }
+
+
+void file_search(struct file_map *f) {
+	// TODO: Write file search
+	f->file = NULL;
+}
\ No newline at end of file

userprog/syscall.h

@@ -3,4 +3,6 @@
 
 void syscall_init (void);
 
+void file_search(struct file_map *f);
+
 #endif /* userprog/syscall.h */

userprog/syscall_filesize.c

@@ -8,13 +8,14 @@
 #include "filesys/file.h"
 
 int syscall_filesize(struct intr_frame *f) {
+	struct file_map *f_map; // Described in system_calls.h
 	// pop off first int argument from interrupt frame
-	int file_descriptor = *((int*)f->esp + 1);
-    // Described in system_calls.h, stores file descriptors mapped to files
-	struct file_map *file_map = get_file(file_descriptor); 
-	if (file_map == NULL) // Checking if file is empty or non-existent
+	f_map->file_descriptor = *((int*)f->esp + 1);
+	file_search();
+	if (f_map->file == NULL) { // Checking if file is empty or non-existent
 		return -1; // Returning failure state
+	}
 	// Using the file_length function in file.h to get the length and store it
-	int size = file_length(file_map->file); 
+	int size = file_length(f_map->file); 
 	f->eax = size;
 }
\ No newline at end of file