[melted] / src / valerie / valerie.c

/*
 * valerie.c -- High Level Client API for miracle
 * Copyright (C) 2002-2003 Ushodaya Enterprises Limited
 * Author: Charles Yates <charles.yates@pandora.be>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/* System header files */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>

/* Application header files */
#include "valerie.h"
#include "valerie_tokeniser.h"
#include "valerie_util.h"

/** Initialise the valerie structure.
*/

valerie valerie_init( valerie_parser parser )
{
        valerie this = malloc( sizeof( valerie_t ) );
        if ( this != NULL )
        {
                memset( this, 0, sizeof( valerie_t ) );
                this->parser = parser;
        }
        return this;
}

/** Set the response structure associated to the last command.
*/

static void valerie_set_last_response( valerie this, valerie_response response )
{
        if ( this != NULL )
        {
                if ( this->last_response != NULL )
                        valerie_response_close( this->last_response );
                this->last_response = response;
        }
}

/** Connect to the parser.
*/

valerie_error_code valerie_connect( valerie this )
{
        valerie_error_code error = valerie_server_unavailable;
        valerie_response response = valerie_parser_connect( this->parser );
        if ( response != NULL )
        {
                valerie_set_last_response( this, response );
                if ( valerie_response_get_error_code( response ) == 100 )
                        error = valerie_ok;
        }
        return error;
}

/** Interpret a non-context sensitive error code.
*/

static valerie_error_code valerie_get_error_code( valerie this, valerie_response response )
{
        valerie_error_code error = valerie_server_unavailable;
        switch( valerie_response_get_error_code( response ) )
        {
                case -1:
                        error = valerie_server_unavailable;
                        break;
                case -2:
                        error = valerie_no_response;
                        break;
                case 200:
                case 201:
                case 202:
                        error = valerie_ok;
                        break;
                case 400:
                        error = valerie_invalid_command;
                        break;
                case 401:
                        error = valerie_server_timeout;
                        break;
                case 402:
                        error = valerie_missing_argument;
                        break;
                case 403:
                        error = valerie_unit_unavailable;
                        break;
                case 404:
                        error = valerie_invalid_file;
                        break;
                default:
                case 500:
                        error = valerie_unknown_error;
                        break;
        }
        return error;
}

/** Execute a command.
*/

valerie_error_code valerie_execute( valerie this, size_t size, char *format, ... )
{
        valerie_error_code error = valerie_server_unavailable;
        char *command = malloc( size );
        if ( this != NULL && command != NULL )
        {
                va_list list;
                va_start( list, format );
                if ( vsnprintf( command, size, format, list ) != 0 )
                {
                        valerie_response response = valerie_parser_execute( this->parser, command );
                        valerie_set_last_response( this, response );
                        error = valerie_get_error_code( this, response );
                }
                else
                {
                        error = valerie_invalid_command;
                }
                va_end( list );
        }
        else
        {
                error = valerie_malloc_failed;
        }
        free( command );
        return error;
}

/** Execute a command.
*/

valerie_error_code valerie_receive( valerie this, char *doc, size_t size, char *format, ... )
{
        valerie_error_code error = valerie_server_unavailable;
        char *command = malloc( size );
        if ( this != NULL && command != NULL )
        {
                va_list list;
                va_start( list, format );
                if ( vsnprintf( command, size, format, list ) != 0 )
                {
                        valerie_response response = valerie_parser_received( this->parser, command, doc );
                        valerie_set_last_response( this, response );
                        error = valerie_get_error_code( this, response );
                }
                else
                {
                        error = valerie_invalid_command;
                }
                va_end( list );
        }
        else
        {
                error = valerie_malloc_failed;
        }
        free( command );
        return error;
}

/** Execute a command.
*/

valerie_error_code valerie_push( valerie this, mlt_service service, size_t size, char *format, ... )
{
        valerie_error_code error = valerie_server_unavailable;
        char *command = malloc( size );
        if ( this != NULL && command != NULL )
        {
                va_list list;
                va_start( list, format );
                if ( vsnprintf( command, size, format, list ) != 0 )
                {
                        valerie_response response = valerie_parser_push( this->parser, command, service );
                        valerie_set_last_response( this, response );
                        error = valerie_get_error_code( this, response );
                }
                else
                {
                        error = valerie_invalid_command;
                }
                va_end( list );
        }
        else
        {
                error = valerie_malloc_failed;
        }
        free( command );
        return error;
}

/** Set a global property.
*/

valerie_error_code valerie_set( valerie this, char *property, char *value )
{
        return valerie_execute( this, 1024, "SET %s=%s", property, value );
}

/** Get a global property.
*/

valerie_error_code valerie_get( valerie this, char *property, char *value, int length )
{
        valerie_error_code error = valerie_execute( this, 1024, "GET %s", property );
        if ( error == valerie_ok )
        {
                valerie_response response = valerie_get_last_response( this );
                strncpy( value, valerie_response_get_line( response, 1 ), length );
        }
        return error;
}

/** Run a script.
*/

valerie_error_code valerie_run( valerie this, char *file )
{
        return valerie_execute( this, 10240, "RUN \"%s\"", file );
}

/** Add a unit.
*/

valerie_error_code valerie_unit_add( valerie this, char *guid, int *unit )
{
        valerie_error_code error = valerie_execute( this, 1024, "UADD %s", guid );
        if ( error == valerie_ok )
        {
                int length = valerie_response_count( this->last_response );
                char *line = valerie_response_get_line( this->last_response, length - 1 );
                if ( line == NULL || sscanf( line, "U%d", unit ) != 1 )
                        error = valerie_unit_creation_failed;
        }
        else
        {
                if ( error == valerie_unknown_error )
                        error = valerie_unit_creation_failed;
        }
        return error;
}

/** Load a file on the specified unit.
*/

valerie_error_code valerie_unit_load( valerie this, int unit, char *file )
{
        return valerie_execute( this, 10240, "LOAD U%d \"%s\"", unit, file );
}

static void valerie_interpret_clip_offset( char *output, valerie_clip_offset offset, int clip )
{
        switch( offset )
        {
                case valerie_absolute:
                        sprintf( output, "%d", clip );
                        break;
                case valerie_relative:
                        if ( clip < 0 )
                                sprintf( output, "%d", clip );
                        else
                                sprintf( output, "+%d", clip );
                        break;
        }
}

/** Load a file on the specified unit with the specified in/out points.
*/

valerie_error_code valerie_unit_load_clipped( valerie this, int unit, char *file, int32_t in, int32_t out )
{
        return valerie_execute( this, 10240, "LOAD U%d \"%s\" %d %d", unit, file, in, out );
}

/** Load a file on the specified unit at the end of the current pump.
*/

valerie_error_code valerie_unit_load_back( valerie this, int unit, char *file )
{
        return valerie_execute( this, 10240, "LOAD U%d \"!%s\"", unit, file );
}

/** Load a file on the specified unit at the end of the pump with the specified in/out points.
*/

valerie_error_code valerie_unit_load_back_clipped( valerie this, int unit, char *file, int32_t in, int32_t out )
{
        return valerie_execute( this, 10240, "LOAD U%d \"!%s\" %d %d", unit, file, in, out );
}

/** Append a file on the specified unit.
*/

valerie_error_code valerie_unit_append( valerie this, int unit, char *file, int32_t in, int32_t out )
{
        return valerie_execute( this, 10240, "APND U%d \"%s\" %d %d", unit, file, in, out );
}

/** Push a service on to a unit.
*/

valerie_error_code valerie_unit_receive( valerie this, int unit, char *command, char *doc )
{
        return valerie_receive( this, doc, 10240, "PUSH U%d %s", unit, command );
}

/** Push a service on to a unit.
*/

valerie_error_code valerie_unit_push( valerie this, int unit, char *command, mlt_service service )
{
        return valerie_push( this, service, 10240, "PUSH U%d %s", unit, command );
}

/** Clean the unit - this function removes all but the currently playing clip.
*/

valerie_error_code valerie_unit_clean( valerie this, int unit )
{
        return valerie_execute( this, 1024, "CLEAN U%d", unit );
}

/** Clear the unit - this function removes all clips.
*/

valerie_error_code valerie_unit_clear( valerie this, int unit )
{
        return valerie_execute( this, 1024, "CLEAR U%d", unit );
}

/** Move clips on the units playlist.
*/

valerie_error_code valerie_unit_clip_move( valerie this, int unit, valerie_clip_offset src_offset, int src, valerie_clip_offset dest_offset, int dest )
{
        char temp1[ 100 ];
        char temp2[ 100 ];
        valerie_interpret_clip_offset( temp1, src_offset, src );
        valerie_interpret_clip_offset( temp2, dest_offset, dest );
        return valerie_execute( this, 1024, "MOVE U%d %s %s", unit, temp1, temp2 );
}

/** Remove clip at the specified position.
*/

valerie_error_code valerie_unit_clip_remove( valerie this, int unit, valerie_clip_offset offset, int clip )
{
        char temp[ 100 ];
        valerie_interpret_clip_offset( temp, offset, clip );
        return valerie_execute( this, 1024, "REMOVE U%d %s", unit, temp );
}

/** Remove the currently playing clip.
*/

valerie_error_code valerie_unit_remove_current_clip( valerie this, int unit )
{
        return valerie_execute( this, 1024, "REMOVE U%d", unit );
}

/** Insert clip at the specified position.
*/

valerie_error_code valerie_unit_clip_insert( valerie this, int unit, valerie_clip_offset offset, int clip, char *file, int32_t in, int32_t out )
{
        char temp[ 100 ];
        valerie_interpret_clip_offset( temp, offset, clip );
        return valerie_execute( this, 1024, "INSERT U%d \"%s\" %s %d %d", unit, file, temp, in, out );
}

/** Play the unit at normal speed.
*/

valerie_error_code valerie_unit_play( valerie this, int unit )
{
        return valerie_execute( this, 1024, "PLAY U%d 1000", unit );
}

/** Play the unit at specified speed.
*/

valerie_error_code valerie_unit_play_at_speed( valerie this, int unit, int speed )
{
        return valerie_execute( this, 10240, "PLAY U%d %d", unit, speed );
}

/** Stop playback on the specified unit.
*/

valerie_error_code valerie_unit_stop( valerie this, int unit )
{
        return valerie_execute( this, 1024, "STOP U%d", unit );
}

/** Pause playback on the specified unit.
*/

valerie_error_code valerie_unit_pause( valerie this, int unit )
{
        return valerie_execute( this, 1024, "PAUSE U%d", unit );
}

/** Rewind the specified unit.
*/

valerie_error_code valerie_unit_rewind( valerie this, int unit )
{
        return valerie_execute( this, 1024, "REW U%d", unit );
}

/** Fast forward the specified unit.
*/

valerie_error_code valerie_unit_fast_forward( valerie this, int unit )
{
        return valerie_execute( this, 1024, "FF U%d", unit );
}

/** Step by the number of frames on the specified unit.
*/

valerie_error_code valerie_unit_step( valerie this, int unit, int32_t step )
{
        return valerie_execute( this, 1024, "STEP U%d %d", unit, step );
}

/** Goto the specified frame on the specified unit.
*/

valerie_error_code valerie_unit_goto( valerie this, int unit, int32_t position )
{
        return valerie_execute( this, 1024, "GOTO U%d %d", unit, position );
}

/** Goto the specified frame in the clip on the specified unit.
*/

valerie_error_code valerie_unit_clip_goto( valerie this, int unit, valerie_clip_offset offset, int clip, int32_t position )
{
        char temp[ 100 ];
        valerie_interpret_clip_offset( temp, offset, clip );
        return valerie_execute( this, 1024, "GOTO U%d %d %s", unit, position, temp );
}

/** Set the in point of the loaded file on the specified unit.
*/

valerie_error_code valerie_unit_set_in( valerie this, int unit, int32_t in )
{
        return valerie_execute( this, 1024, "SIN U%d %d", unit, in );
}

/** Set the in point of the clip on the specified unit.
*/

valerie_error_code valerie_unit_clip_set_in( valerie this, int unit, valerie_clip_offset offset, int clip, int32_t in )
{
        char temp[ 100 ];
        valerie_interpret_clip_offset( temp, offset, clip );
        return valerie_execute( this, 1024, "SIN U%d %d %s", unit, in, temp );
}

/** Set the out point of the loaded file on the specified unit.
*/

valerie_error_code valerie_unit_set_out( valerie this, int unit, int32_t out )
{
        return valerie_execute( this, 1024, "SOUT U%d %d", unit, out );
}

/** Set the out point of the clip on the specified unit.
*/

valerie_error_code valerie_unit_clip_set_out( valerie this, int unit, valerie_clip_offset offset, int clip, int32_t in )
{
        char temp[ 100 ];
        valerie_interpret_clip_offset( temp, offset, clip );
        return valerie_execute( this, 1024, "SOUT U%d %d %s", unit, in, temp );
}

/** Clear the in point of the loaded file on the specified unit.
*/

valerie_error_code valerie_unit_clear_in( valerie this, int unit )
{
        return valerie_execute( this, 1024, "SIN U%d -1", unit );
}

/** Clear the out point of the loaded file on the specified unit.
*/

valerie_error_code valerie_unit_clear_out( valerie this, int unit )
{
        return valerie_execute( this, 1024, "SOUT U%d -1", unit );
}

/** Clear the in and out points on the loaded file on the specified unit.
*/

valerie_error_code valerie_unit_clear_in_out( valerie this, int unit )
{
        valerie_error_code error = valerie_unit_clear_out( this, unit );
        if ( error == valerie_ok )
                error = valerie_unit_clear_in( this, unit );
        return error;
}

/** Set a unit configuration property.
*/

valerie_error_code valerie_unit_set( valerie this, int unit, char *name, char *value )
{
        return valerie_execute( this, 1024, "USET U%d %s=%s", unit, name, value );
}

/** Get a unit configuration property.
*/

valerie_error_code valerie_unit_get( valerie this, int unit, char *name )
{
        return valerie_execute( this, 1024, "UGET U%d %s", unit, name );
}

/** Get a units status.
*/

valerie_error_code valerie_unit_status( valerie this, int unit, valerie_status status )
{
        valerie_error_code error = valerie_execute( this, 1024, "USTA U%d", unit );
        int error_code = valerie_response_get_error_code( this->last_response );

        memset( status, 0, sizeof( valerie_status_t ) );
        status->unit = unit;
        if ( error_code == 202 && valerie_response_count( this->last_response ) == 2 )
                valerie_status_parse( status, valerie_response_get_line( this->last_response, 1 ) );
        else if ( error_code == 403 )
                status->status = unit_undefined;

        return error;
}

/** Transfer the current settings of unit src to unit dest.
*/

valerie_error_code valerie_unit_transfer( valerie this, int src, int dest )
{
        return valerie_execute( this, 1024, "XFER U%d U%d", src, dest );
}

/** Obtain the parsers notifier.
*/

valerie_notifier valerie_get_notifier( valerie this )
{
        if ( this != NULL )
                return valerie_parser_get_notifier( this->parser );
        else
                return NULL;
}

/** List the contents of the specified directory.
*/

valerie_dir valerie_dir_init( valerie this, char *directory )
{
        valerie_dir dir = malloc( sizeof( valerie_dir_t ) );
        if ( dir != NULL )
        {
                memset( dir, 0, sizeof( valerie_dir_t ) );
                dir->directory = strdup( directory );
                dir->response = valerie_parser_executef( this->parser, "CLS \"%s\"", directory );
        }
        return dir;
}

/** Return the error code associated to the dir.
*/

valerie_error_code valerie_dir_get_error_code( valerie_dir dir )
{
        if ( dir != NULL )
                return valerie_get_error_code( NULL, dir->response );
        else
                return valerie_malloc_failed;
}

/** Get a particular file entry in the directory.
*/

valerie_error_code valerie_dir_get( valerie_dir dir, int index, valerie_dir_entry entry )
{
        valerie_error_code error = valerie_ok;
        memset( entry, 0, sizeof( valerie_dir_entry_t ) );
        if ( index < valerie_dir_count( dir ) )
        {
                char *line = valerie_response_get_line( dir->response, index + 1 );
                valerie_tokeniser tokeniser = valerie_tokeniser_init( );
                valerie_tokeniser_parse_new( tokeniser, line, " " );

                if ( valerie_tokeniser_count( tokeniser ) > 0 )
                {
                        valerie_util_strip( valerie_tokeniser_get_string( tokeniser, 0 ), '\"' );
                        strcpy( entry->full, dir->directory );
                        if ( entry->full[ strlen( entry->full ) - 1 ] != '/' )
                                strcat( entry->full, "/" );
                        strcpy( entry->name, valerie_tokeniser_get_string( tokeniser, 0 ) );
                        strcat( entry->full, entry->name );

                        switch ( valerie_tokeniser_count( tokeniser ) )
                        {
                                case 1:
                                        entry->dir = 1;
                                        break;
                                case 2:
                                        entry->size = strtoull( valerie_tokeniser_get_string( tokeniser, 1 ), NULL, 10 );
                                        break;
                                default:
                                        error = valerie_invalid_file;
                                        break;
                        }
                }
                valerie_tokeniser_close( tokeniser );
        }
        return error;
}

/** Get the number of entries in the directory
*/

int valerie_dir_count( valerie_dir dir )
{
        if ( dir != NULL && valerie_response_count( dir->response ) >= 2 )
                return valerie_response_count( dir->response ) - 2;
        else
                return -1;
}

/** Close the directory structure.
*/

void valerie_dir_close( valerie_dir dir )
{
        if ( dir != NULL )
        {
                free( dir->directory );
                valerie_response_close( dir->response );
                free( dir );
        }
}

/** List the playlist of the specified unit.
*/

valerie_list valerie_list_init( valerie this, int unit )
{
        valerie_list list = calloc( 1, sizeof( valerie_list_t ) );
        if ( list != NULL )
        {
                list->response = valerie_parser_executef( this->parser, "LIST U%d", unit );
                if ( valerie_response_count( list->response ) >= 2 )
                        list->generation = atoi( valerie_response_get_line( list->response, 1 ) );
        }
        return list;
}

/** Return the error code associated to the list.
*/

valerie_error_code valerie_list_get_error_code( valerie_list list )
{
        if ( list != NULL )
                return valerie_get_error_code( NULL, list->response );
        else
                return valerie_malloc_failed;
}

/** Get a particular file entry in the list.
*/

valerie_error_code valerie_list_get( valerie_list list, int index, valerie_list_entry entry )
{
        valerie_error_code error = valerie_ok;
        memset( entry, 0, sizeof( valerie_list_entry_t ) );
        if ( index < valerie_list_count( list ) )
        {
                char *line = valerie_response_get_line( list->response, index + 2 );
                valerie_tokeniser tokeniser = valerie_tokeniser_init( );
                valerie_tokeniser_parse_new( tokeniser, line, " " );

                if ( valerie_tokeniser_count( tokeniser ) > 0 )
                {
                        entry->clip = atoi( valerie_tokeniser_get_string( tokeniser, 0 ) );
                        valerie_util_strip( valerie_tokeniser_get_string( tokeniser, 1 ), '\"' );
                        strcpy( entry->full, valerie_tokeniser_get_string( tokeniser, 1 ) );
                        entry->in = atol( valerie_tokeniser_get_string( tokeniser, 2 ) );
                        entry->out = atol( valerie_tokeniser_get_string( tokeniser, 3 ) );
                        entry->max = atol( valerie_tokeniser_get_string( tokeniser, 4 ) );
                        entry->size = atol( valerie_tokeniser_get_string( tokeniser, 5 ) );
                        entry->fps = atof( valerie_tokeniser_get_string( tokeniser, 6 ) );
                }
                valerie_tokeniser_close( tokeniser );
        }
        return error;
}

/** Get the number of entries in the list
*/

int valerie_list_count( valerie_list list )
{
        if ( list != NULL && valerie_response_count( list->response ) >= 3 )
                return valerie_response_count( list->response ) - 3;
        else
                return -1;
}

/** Close the list structure.
*/

void valerie_list_close( valerie_list list )
{
        if ( list != NULL )
        {
                valerie_response_close( list->response );
                free( list );
        }
}

/** List the currently connected nodes.
*/

valerie_nodes valerie_nodes_init( valerie this )
{
        valerie_nodes nodes = malloc( sizeof( valerie_nodes_t ) );
        if ( nodes != NULL )
        {
                memset( nodes, 0, sizeof( valerie_nodes_t ) );
                nodes->response = valerie_parser_executef( this->parser, "NLS" );
        }
        return nodes;
}

/** Return the error code associated to the nodes list.
*/

valerie_error_code valerie_nodes_get_error_code( valerie_nodes nodes )
{
        if ( nodes != NULL )
                return valerie_get_error_code( NULL, nodes->response );
        else
                return valerie_malloc_failed;
}

/** Get a particular node entry.
*/

valerie_error_code valerie_nodes_get( valerie_nodes nodes, int index, valerie_node_entry entry )
{
        valerie_error_code error = valerie_ok;
        memset( entry, 0, sizeof( valerie_node_entry_t ) );
        if ( index < valerie_nodes_count( nodes ) )
        {
                char *line = valerie_response_get_line( nodes->response, index + 1 );
                valerie_tokeniser tokeniser = valerie_tokeniser_init( );
                valerie_tokeniser_parse_new( tokeniser, line, " " );

                if ( valerie_tokeniser_count( tokeniser ) == 3 )
                {
                        entry->node = atoi( valerie_tokeniser_get_string( tokeniser, 0 ) );
                        strncpy( entry->guid, valerie_tokeniser_get_string( tokeniser, 1 ), sizeof( entry->guid ) );
                        valerie_util_strip( valerie_tokeniser_get_string( tokeniser, 2 ), '\"' );
                        strncpy( entry->name, valerie_tokeniser_get_string( tokeniser, 2 ), sizeof( entry->name ) );
                }

                valerie_tokeniser_close( tokeniser );
        }
        return error;
}

/** Get the number of nodes
*/

int valerie_nodes_count( valerie_nodes nodes )
{
        if ( nodes != NULL && valerie_response_count( nodes->response ) >= 2 )
                return valerie_response_count( nodes->response ) - 2;
        else
                return -1;
}

/** Close the nodes structure.
*/

void valerie_nodes_close( valerie_nodes nodes )
{
        if ( nodes != NULL )
        {
                valerie_response_close( nodes->response );
                free( nodes );
        }
}

/** List the currently defined units.
*/

valerie_units valerie_units_init( valerie this )
{
        valerie_units units = malloc( sizeof( valerie_units_t ) );
        if ( units != NULL )
        {
                memset( units, 0, sizeof( valerie_units_t ) );
                units->response = valerie_parser_executef( this->parser, "ULS" );
        }
        return units;
}

/** Return the error code associated to the nodes list.
*/

valerie_error_code valerie_units_get_error_code( valerie_units units )
{
        if ( units != NULL )
                return valerie_get_error_code( NULL, units->response );
        else
                return valerie_malloc_failed;
}

/** Get a particular unit entry.
*/

valerie_error_code valerie_units_get( valerie_units units, int index, valerie_unit_entry entry )
{
        valerie_error_code error = valerie_ok;
        memset( entry, 0, sizeof( valerie_unit_entry_t ) );
        if ( index < valerie_units_count( units ) )
        {
                char *line = valerie_response_get_line( units->response, index + 1 );
                valerie_tokeniser tokeniser = valerie_tokeniser_init( );
                valerie_tokeniser_parse_new( tokeniser, line, " " );

                if ( valerie_tokeniser_count( tokeniser ) == 4 )
                {
                        entry->unit = atoi( valerie_tokeniser_get_string( tokeniser, 0 ) + 1 );
                        entry->node = atoi( valerie_tokeniser_get_string( tokeniser, 1 ) );
                        strncpy( entry->guid, valerie_tokeniser_get_string( tokeniser, 2 ), sizeof( entry->guid ) );
                        entry->online = atoi( valerie_tokeniser_get_string( tokeniser, 3 ) );
                }

                valerie_tokeniser_close( tokeniser );
        }
        return error;
}

/** Get the number of units
*/

int valerie_units_count( valerie_units units )
{
        if ( units != NULL && valerie_response_count( units->response ) >= 2 )
                return valerie_response_count( units->response ) - 2;
        else
                return -1;
}

/** Close the units structure.
*/

void valerie_units_close( valerie_units units )
{
        if ( units != NULL )
        {
                valerie_response_close( units->response );
                free( units );
        }
}

/** Get the response of the last command executed.
*/

valerie_response valerie_get_last_response( valerie this )
{
        return this->last_response;
}

/** Obtain a printable message associated to the error code provided.
*/

char *valerie_error_description( valerie_error_code error )
{
        char *msg = "Unrecognised error";
        switch( error )
        {
                case valerie_ok:
                        msg = "OK";
                        break;
                case valerie_malloc_failed:
                        msg = "Memory allocation error";
                        break;
                case valerie_unknown_error:
                        msg = "Unknown error";
                        break;
                case valerie_no_response:
                        msg = "No response obtained";
                        break;
                case valerie_invalid_command:
                        msg = "Invalid command";
                        break;
                case valerie_server_timeout:
                        msg = "Communications with server timed out";
                        break;
                case valerie_missing_argument:
                        msg = "Missing argument";
                        break;
                case valerie_server_unavailable:
                        msg = "Unable to communicate with server";
                        break;
                case valerie_unit_creation_failed:
                        msg = "Unit creation failed";
                        break;
                case valerie_unit_unavailable:
                        msg = "Unit unavailable";
                        break;
                case valerie_invalid_file:
                        msg = "Invalid file";
                        break;
                case valerie_invalid_position:
                        msg = "Invalid position";
                        break;
        }
        return msg;
}

/** Close the valerie structure.
*/

void valerie_close( valerie this )
{
        if ( this != NULL )
        {
                valerie_set_last_response( this, NULL );
                free( this );
        }
}