Replace 32-bit member variable "index" with wider local variables (#764658)

The previous commit (Fix crash reading NTFS usage when there is no
/dev/PTN entry) identified that the FileSystem member variable "index"
is too small on 64-bit machines.  Also this member variable stores no
FileSystem class information and was being used as a local variable.

Replace with local variables of the of the correct type, wide enough to
store the npos not found value.

Bug 764658 - GParted crashes when reading NTFS usage when there is no
             /dev/PTN entry

include/FileSystem.h

@@ -102,7 +102,6 @@ protected:
 	Glib::ustring output, error ;
 	Sector T, N, S ;  //File system [T]otal num of blocks, [N]um of free (or used) blocks, block [S]ize
 	int exit_status ;
-	unsigned int index ;
 
 private:
 	int execute_command_internal( const Glib::ustring & command, OperationDetail & operationdetail,

src/ext2.cc

@@ -128,7 +128,7 @@ void ext2::set_used_sectors( Partition & partition )
 	//  unmounted.
 	if ( ! Utils::execute_command( dump_cmd + " -h " + partition .get_path(), output, error, true ) )
 	{
-		index = output .find( "Block count:" ) ;
+		Glib::ustring::size_type index = output.find( "Block count:" );
 		if ( index >= output .length() ||
 		     sscanf( output.substr( index ) .c_str(), "Block count: %Ld", &T ) != 1 )
 			T = -1 ;

src/fat16.cc

@@ -136,7 +136,7 @@ void fat16::set_used_sectors( Partition & partition )
 	if ( exit_status == 0 || exit_status == 1 )
 	{
 		//total file system size in logical sectors
-		index = output .rfind( "\n", output .find( "sectors total" ) ) +1 ;
+		Glib::ustring::size_type index = output.rfind( "\n", output.find( "sectors total" ) ) + 1;
 		if ( index >= output .length() || sscanf( output .substr( index ) .c_str(), "%Ld", &T ) != 1 )
 			T = -1 ;
 

src/jfs.cc

@@ -79,7 +79,7 @@ void jfs::set_used_sectors( Partition & partition )
 	if ( ! Utils::execute_command( "sh -c 'echo dm | jfs_debugfs " + partition.get_path() + "'", output, error, true ) )
 	{
 		//blocksize
-		index = output .find( "Block Size:" ) ;
+		Glib::ustring::size_type index = output.find( "Block Size:" );
 		if ( index >= output .length() || 
 		     sscanf( output .substr( index ) .c_str(), "Block Size: %Ld", &S ) != 1 ) 
 			S = -1 ;

src/ntfs.cc

@@ -127,7 +127,7 @@ void ntfs::set_used_sectors( Partition & partition )
 		"ntfsresize --info --force --no-progress-bar " + partition .get_path(), output, error, true ) ;
 	if ( exit_status == 0 || exit_status == 1 )
 	{
-		index = output .find( "Current volume size:" ) ;
+		Glib::ustring::size_type index = output.find( "Current volume size:" );
 		if ( index >= output .length() ||
 		     sscanf( output .substr( index ) .c_str(), "Current volume size: %Ld", &T ) != 1 )
 			T = -1 ;

src/reiser4.cc

@@ -64,7 +64,7 @@ void reiser4::set_used_sectors( Partition & partition )
 {
 	if ( ! Utils::execute_command( "debugfs.reiser4 " + partition .get_path(), output, error, true ) )
 	{
-		index = output .find( "\nblocks:" ) ;
+		Glib::ustring::size_type index = output.find( "\nblocks:" );
 		if ( index >= output .length() ||
 		     sscanf( output.substr( index ) .c_str(), "\nblocks: %Ld", &T ) != 1 )
 			T = -1 ;

src/reiserfs.cc

@@ -81,7 +81,7 @@ void reiserfs::set_used_sectors( Partition & partition )
 {
 	if ( ! Utils::execute_command( "debugreiserfs " + partition .get_path(), output, error, true ) )
 	{
-		index = output .find( "Count of blocks on the device:" ) ;
+		Glib::ustring::size_type index = output.find( "Count of blocks on the device:" );
 		if ( index >= output .length() ||
 		     sscanf( output .substr( index ) .c_str(), "Count of blocks on the device: %Ld", &T ) != 1 )
 			T = -1 ;

src/xfs.cc

@@ -99,7 +99,7 @@ void xfs::set_used_sectors( Partition & partition )
 			S = -1 ;
 
 		//filesystem blocks
-		index = output .find( "\ndblocks" ) ;
+		Glib::ustring::size_type index = output.find( "\ndblocks" );
 		if ( index > output .length() ||
 		     sscanf( output .substr( index ) .c_str(), "\ndblocks = %Ld", &T ) != 1 )
 			T = -1 ;