Code added

include/fs.h

@@ -0,0 +1,25 @@
+#define FUSE_USE_VERSION 30
+
+#include <fuse.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <time.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+
+extern char dir_list[256][256];
+extern int curr_dir_idx;
+extern char files_list[256][256];
+extern int curr_file_idx;
+extern char files_content[256][256];
+extern int curr_file_content_idx;
+extern void add_dir( const char *dir_name );
+extern int is_dir( const char *path );
+extern void add_file( const char *filename );
+extern int is_file( const char *path );
+extern int get_file_index( const char *path );
+extern void write_to_file( const char *path, const char *new_content );

src/dirs.c

@@ -0,0 +1,18 @@
+#include "../include/fs.h"
+
+void add_dir( const char *dir_name )
+{
+	curr_dir_idx++;
+	strcpy( dir_list[ curr_dir_idx ], dir_name );
+}
+
+int is_dir( const char *path )
+{
+	path++; // Eliminating "/" in the path
+
+	for ( int curr_idx = 0; curr_idx <= curr_dir_idx; curr_idx++ )
+		if ( strcmp( path, dir_list[ curr_idx ] ) == 0 )
+			return 1;
+
+	return 0;
+}

src/files.c

@@ -0,0 +1,42 @@
+#include "../include/fs.h"
+
+void add_file( const char *filename )
+{
+	curr_file_idx++;
+	strcpy( files_list[ curr_file_idx ], filename );
+
+	curr_file_content_idx++;
+	strcpy( files_content[ curr_file_content_idx ], "" );
+}
+
+int is_file( const char *path )
+{
+	path++; // Eliminating "/" in the path
+
+	for ( int curr_idx = 0; curr_idx <= curr_file_idx; curr_idx++ )
+		if ( strcmp( path, files_list[ curr_idx ] ) == 0 )
+			return 1;
+
+	return 0;
+}
+
+int get_file_index( const char *path )
+{
+	path++; // Eliminating "/" in the path
+
+	for ( int curr_idx = 0; curr_idx <= curr_file_idx; curr_idx++ )
+		if ( strcmp( path, files_list[ curr_idx ] ) == 0 )
+			return curr_idx;
+
+	return -1;
+}
+
+void write_to_file( const char *path, const char *new_content )
+{
+	int file_idx = get_file_index( path );
+
+	if ( file_idx == -1 ) // No such file
+		return;
+
+	strcpy( files_content[ file_idx ], new_content ); 
+}

src/main.c

@@ -0,0 +1,106 @@
+
+
+#include "../include/fs.h"
+
+
+char dir_list[ 256 ][ 256 ];
+int curr_dir_idx = -1;
+char files_list[ 256 ][ 256 ];
+int curr_file_idx = -1;
+char files_content[ 256 ][ 256 ];
+int curr_file_content_idx = -1;
+
+
+static int do_getattr( const char *path, struct stat *st )
+{
+	st->st_uid = getuid(); // The owner of the file/directory is the user who mounted the filesystem
+	st->st_gid = getgid(); // The group of the file/directory is the same as the group of the user who mounted the filesystem
+	st->st_atime = time( NULL ); // The last "a"ccess of the file/directory is right now
+	st->st_mtime = time( NULL ); // The last "m"odification of the file/directory is right now
+
+	if ( strcmp( path, "/" ) == 0 || is_dir( path ) == 1 )
+	{
+		st->st_mode = S_IFDIR | 0755;
+		st->st_nlink = 2; 	}
+	else if ( is_file( path ) == 1 )
+	{
+		st->st_mode = S_IFREG | 0644;
+		st->st_nlink = 1;
+		st->st_size = 1024;
+	}
+	else
+	{
+		return -ENOENT;
+	}
+
+	return 0;
+}
+
+static int do_readdir( const char *path, void *buffer, fuse_fill_dir_t filler, off_t offset, struct fuse_file_info *fi )
+{
+	filler( buffer, ".", NULL, 0 ); // Current Directory
+	filler( buffer, "..", NULL, 0 ); // Parent Directory
+
+	if ( strcmp( path, "/" ) == 0 ) // If the user is trying to show the files/directories of the root directory show the following
+	{
+		for ( int curr_idx = 0; curr_idx <= curr_dir_idx; curr_idx++ )
+			filler( buffer, dir_list[ curr_idx ], NULL, 0 );
+
+		for ( int curr_idx = 0; curr_idx <= curr_file_idx; curr_idx++ )
+			filler( buffer, files_list[ curr_idx ], NULL, 0 );
+	}
+
+	return 0;
+}
+
+static int do_read( const char *path, char *buffer, size_t size, off_t offset, struct fuse_file_info *fi )
+{
+	printf("Reading %s at offset: %ld\n", path, offset);
+	int file_idx = get_file_index( path );
+
+	if ( file_idx == -1 )
+		return -1;
+
+	char *content = files_content[ file_idx ];
+
+	memcpy( buffer, content + offset, size );
+
+	return strlen( content ) - offset;
+}
+
+static int do_mkdir( const char *path, mode_t mode )
+{
+	path++;
+	add_dir( path );
+
+	return 0;
+}
+
+static int do_mknod( const char *path, mode_t mode, dev_t rdev )
+{
+	path++;
+	add_file( path );
+
+	return 0;
+}
+
+static int do_write( const char *path, const char *buffer, size_t size, off_t offset, struct fuse_file_info *info )
+{
+	write_to_file( path, buffer );
+	printf("Writing to %s at offset: %ld\n", path, offset);
+	return size;
+}
+
+static struct fuse_operations operations = {
+    .getattr	= do_getattr,
+    .readdir	= do_readdir,
+    .read		= do_read,
+    .mkdir		= do_mkdir,
+    .mknod		= do_mknod,
+    .write		= do_write,
+};
+
+int main( int argc, char *argv[] )
+{
+	return fuse_main( argc, argv, &operations, NULL );
+}