source: mainline/uspace/srv/net/structures/measured_strings.c@ b5cbff4

/*
 * Copyright (c) 2009 Lukas Mejdrech
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup net
 *  @{
 */

/** @file
 *  Character string with measured length implementation.
 *  @see measured_strings.h
 */

#include <errno.h>
#include <malloc.h>
#include <mem.h>
#include <unistd.h>

#include <ipc/ipc.h>

#include "../err.h"
#include "../modules.h"

#include "measured_strings.h"

/** Computes the lengths of the measured strings in the given array.
 *  @param[in] strings The measured strings array to be processed.
 *  @param[in] count The measured strings array size.
 *  @returns The computed sizes array.
 *  @returns NULL if there is not enough memory left.
 */
size_t *        prepare_lengths( const measured_string_ref strings, size_t count );

measured_string_ref measured_string_create_bulk( const char * string, size_t length ){
        measured_string_ref     new;

        if( length == 0 ){
                while( string[ length ] ) ++ length;
        }
        new = ( measured_string_ref ) malloc( sizeof( measured_string_t ) + ( sizeof( char ) * ( length + 1 )));
        if( ! new ) return NULL;
        new->length = length;
        new->value = (( char * ) new ) + sizeof( measured_string_t );
        // append terminating zero explicitly - to be safe
        memcpy( new->value, string, new->length );
        new->value[ new->length ] = '\0';
        return new;
}

measured_string_ref measured_string_copy( measured_string_ref source ){
        measured_string_ref     new;

        if( ! source ) return NULL;
        new = ( measured_string_ref ) malloc( sizeof( measured_string_t ));
        if( new ){
                new->value = ( char * ) malloc( source->length + 1 );
                if( new->value ){
                        new->length = source->length;
                        memcpy( new->value, source->value, new->length );
                        new->value[ new->length ] = '\0';
                        return new;
                }else{
                        free( new );
                }
        }
        return NULL;
}

int measured_strings_receive( measured_string_ref * strings, char ** data, size_t count ){
        ERROR_DECLARE;

        size_t *                lengths;
        size_t                  index;
        size_t                  length;
        char *                  next;
        ipc_callid_t    callid;

        if(( ! strings ) || ( ! data ) || ( count <= 0 )){
                return EINVAL;
        }
        lengths = ( size_t * ) malloc( sizeof( size_t ) * ( count + 1 ));
        if( ! lengths ) return ENOMEM;
        if(( ! async_data_write_receive( & callid, & length ))
        || ( length != sizeof( size_t ) * ( count + 1 ))){
                free( lengths );
                return EINVAL;
        }
        if( ERROR_OCCURRED( async_data_write_finalize( callid, lengths, sizeof( size_t ) * ( count + 1 )))){
                free( lengths );
                return ERROR_CODE;
        }
        * data = malloc( lengths[ count ] );
        if( !( * data )) return ENOMEM;
        ( * data )[ lengths[ count ] - 1 ] = '\0';
        * strings = ( measured_string_ref ) malloc( sizeof( measured_string_t ) * count );
        if( !( * strings )){
                free( lengths );
                free( * data );
                return ENOMEM;
        }
        next = * data;
        for( index = 0; index < count; ++ index ){
                ( * strings)[ index ].length = lengths[ index ];
                if( lengths[ index ] > 0 ){
                        if(( ! async_data_write_receive( & callid, & length ))
                        || ( length != lengths[ index ] )){
                                free( * data );
                                free( * strings );
                                free( lengths );
                                return EINVAL;
                        }
                        ERROR_PROPAGATE( async_data_write_finalize( callid, next, lengths[ index ] ));
                        ( * strings)[ index ].value = next;
                        next += lengths[ index ];
                        * next = '\0';
                        ++ next;
                }else{
                        ( * strings )[ index ].value = NULL;
                }
        }
        free( lengths );
        return EOK;
}

int measured_strings_reply( const measured_string_ref strings, size_t count ){
        ERROR_DECLARE;

        size_t *                lengths;
        size_t                  index;
        size_t                  length;
        ipc_callid_t    callid;

        if(( ! strings ) || ( count <= 0 )){
                return EINVAL;
        }
        lengths = prepare_lengths( strings, count );
        if( ! lengths ) return ENOMEM;
        if(( ! async_data_read_receive( & callid, & length ))
        || ( length != sizeof( size_t ) * ( count + 1 ))){
                free( lengths );
                return EINVAL;
        }
        if( ERROR_OCCURRED( async_data_read_finalize( callid, lengths, sizeof( size_t ) * ( count + 1 )))){
                free( lengths );
                return ERROR_CODE;
        }
        free( lengths );
        for( index = 0; index < count; ++ index ){
                if( strings[ index ].length > 0 ){
                        if(( ! async_data_read_receive( & callid, & length ))
                        || ( length != strings[ index ].length )){
                                return EINVAL;
                        }
                        ERROR_PROPAGATE( async_data_read_finalize( callid, strings[ index ].value, strings[ index ].length ));
                }
        }
        return EOK;
}

int measured_strings_return( int phone, measured_string_ref * strings, char ** data, size_t count ){
        ERROR_DECLARE;

        size_t *        lengths;
        size_t          index;
        char *          next;

        if(( phone <= 0 ) || ( ! strings ) || ( ! data ) || ( count <= 0 )){
                return EINVAL;
        }
        lengths = ( size_t * ) malloc( sizeof( size_t ) * ( count + 1 ));
        if( ! lengths ) return ENOMEM;
        if( ERROR_OCCURRED( async_data_read_start( phone, lengths, sizeof( size_t ) * ( count + 1 )))){
                free( lengths );
                return ERROR_CODE;
        }
        * data = malloc( lengths[ count ] );
        if( !( * data )) return ENOMEM;
        * strings = ( measured_string_ref ) malloc( sizeof( measured_string_t ) * count );
        if( !( * strings )){
                free( lengths );
                free( * data );
                return ENOMEM;
        }
        next = * data;
        for( index = 0; index < count; ++ index ){
                ( * strings )[ index ].length = lengths[ index ];
                if( lengths[ index ] > 0 ){
                        ERROR_PROPAGATE( async_data_read_start( phone, next, lengths[ index ] ));
                        ( * strings )[ index ].value = next;
                        next += lengths[ index ];
                        * next = '\0';
                        ++ next;
                }else{
                        ( * strings )[ index ].value = NULL;
                }
        }
        free( lengths );
        return EOK;
}

int measured_strings_send( int phone, const measured_string_ref strings, size_t count ){
        ERROR_DECLARE;

        size_t *        lengths;
        size_t          index;

        if(( phone <= 0 ) || ( ! strings ) || ( count <= 0 )){
                return EINVAL;
        }
        lengths = prepare_lengths( strings, count );
        if( ! lengths ) return ENOMEM;
        if( ERROR_OCCURRED( async_data_write_start( phone, lengths, sizeof( size_t ) * ( count + 1 )))){
                free( lengths );
                return ERROR_CODE;
        }
        free( lengths );
        for( index = 0; index < count; ++ index ){
                if( strings[ index ].length > 0 ){
                        ERROR_PROPAGATE( async_data_write_start( phone, strings[ index ].value, strings[ index ].length ));
                }
        }
        return EOK;
}

size_t * prepare_lengths( const measured_string_ref strings, size_t count ){
        size_t *        lengths;
        size_t          index;
        size_t          length;

        lengths = ( size_t * ) malloc( sizeof( size_t ) * ( count + 1 ));
        if( ! lengths ) return NULL;
        length = 0;
        for( index = 0; index < count; ++ index ){
                lengths[ index ] = strings[ index ].length;
                length += lengths[ index ] + 1;
        }
        lengths[ count ] = length;
        return lengths;
}

/** @}
 */