Subversion Repositories HelenOS

/*

 * 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 to integer map implementation.

 *  @see char_map.h

 */

#include <errno.h>

#include <malloc.h>

#include <mem.h>

#include <unistd.h>

#include "char_map.h"

/** Internal magic value for a consistency check.

 */

#define CHAR_MAP_MAGIC_VALUE    0x12345611

/** Adds the value with the key to the map.

 *  Creates new nodes to map the key.

 *  @param map The character string to integer map. Input/output parameter.

 *  @param identifier The key zero ('\\0') terminated character string. The key character string is processed until the first terminating zero ('\\0') character after the given length is found. Input parameter.

 *  @param length The key character string length. The parameter may be zero (0) which means that the string is processed until the terminating zero ('\\0') character is found. Input parameter.

 *  @param value The integral value to be stored for the key character string. Input parameter.

 *  @returns EOK on success.

 *  @returns ENOMEM if there is not enough memory left.

 *  @returns EEXIST if the key character string is already used.

 */

int char_map_add_item( char_map_ref map, const char * identifier, size_t length, const int value );

/** Returns the node assigned to the key from the map.

 *  @param map The character string to integer map. Input parameter.

 *  @param identifier The key zero ('\\0') terminated character string. The key character string is processed until the first terminating zero ('\\0') character after the given length is found. Input parameter.

 *  @param length The key character string length. The parameter may be zero (0) which means that the string is processed until the terminating zero ('\\0') character is found. Input parameter.

 *  @returns The node holding the integral value assigned to the key character string.

 *  @returns NULL if the key is not assigned a node.

 */

char_map_ref    char_map_find_node( const char_map_ref map, const char * identifier, const size_t length );

/** Checks if the map is valid.

 *  @param map The character string to integer map. Input parameter.

 *  @returns TRUE if the map is valid.

 *  @returns FALSE otherwise.

 */

int char_map_is_valid( const char_map_ref map );

int char_map_add( char_map_ref map, const char * identifier, size_t length, const int value ){

    if( char_map_is_valid( map ) && ( identifier ) && (( length ) || ( * identifier ))){

        int index;

        for( index = 0; index < map->next; ++ index ){

            if( map->items[ index ]->c == * identifier ){

                ++ identifier;

                if(( length > 1 ) || (( length == 0 ) && ( * identifier ))){

                    return char_map_add( map->items[ index ], identifier, length ? length - 1 : 0, value );

                }else{

                    if( map->items[ index ]->value != CHAR_MAP_NULL ) return EEXISTS;

                    map->items[ index ]->value = value;

                    return EOK;

                }

            }

        }

        return char_map_add_item( map, identifier, length, value );

    }

    return EINVAL;

}

int char_map_add_item( char_map_ref map, const char * identifier, size_t length, const int value ){

    if( map->next == ( map->size - 1 )){

        char_map_ref    * tmp;

        tmp = ( char_map_ref * ) realloc( map->items, sizeof( char_map_ref ) * 2 * map->size );

        if( ! tmp ) return ENOMEM;

        map->size *= 2;

        map->items = tmp;

    }

    map->items[ map->next ] = ( char_map_ref ) malloc( sizeof( char_map_t ));

    if( ! map->items[ map->next ] ) return ENOMEM;

    if( char_map_initialize( map->items[ map->next ] ) != EOK ){

        free( map->items[ map->next ] );

        map->items[ map->next ] = NULL;

        return ENOMEM;

    }

    map->items[ map->next ]->c = * identifier;

    ++ identifier;

    ++ map->next;

    if(( length > 1 ) || (( length == 0 ) && ( * identifier ))){

        map->items[ map->next - 1 ]->value = CHAR_MAP_NULL;

        return char_map_add_item( map->items[ map->next - 1 ], identifier, length ? length - 1 : 0, value );

    }else{

        map->items[ map->next - 1 ]->value = value;

    }

    return EOK;

}

void char_map_destroy( char_map_ref map ){

    if( char_map_is_valid( map )){

        int index;

        map->magic = 0;

        for( index = 0; index < map->next; ++ index ){

            char_map_destroy( map->items[ index ] );

        }

        free( map->items );

        map->items = NULL;

    }

}

int char_map_exclude( char_map_ref map, const char * identifier, size_t length ){

    char_map_ref    node;

    node = char_map_find_node( map, identifier, length );

    if( node ){

        int value;

        value = node->value;

        node->value = CHAR_MAP_NULL;

        return value;

    }

    return CHAR_MAP_NULL;

}

int char_map_find( const char_map_ref map, const char * identifier, size_t length ){

    char_map_ref    node;

    node = char_map_find_node( map, identifier, length );

    return node ? node->value : CHAR_MAP_NULL;

}

char_map_ref char_map_find_node( const char_map_ref map, const char * identifier, size_t length ){

    if( ! char_map_is_valid( map )) return NULL;

    if( length || ( * identifier )){

        int index;

        for( index = 0; index < map->next; ++ index ){

            if( map->items[ index ]->c == * identifier ){

                ++ identifier;

                if( length == 1 ) return map->items[ index ];

                return char_map_find_node( map->items[ index ], identifier, length ? length - 1 : 0 );

            }

        }

        return NULL;

    }

    return map;

}

int char_map_get_value( const char_map_ref map ){

    return char_map_is_valid( map ) ? map->value : CHAR_MAP_NULL;

}

int char_map_initialize( char_map_ref map ){

    if( ! map ) return EINVAL;

    map->c = '\0';

    map->value = CHAR_MAP_NULL;

    map->size = 2;

    map->next = 0;

    map->items = malloc( sizeof( char_map_ref ) * map->size );

    if( ! map->items ){

        map->magic = 0;

        return ENOMEM;

    }

    map->items[ map->next ] = NULL;

    map->magic = CHAR_MAP_MAGIC_VALUE;

    return EOK;

}

int char_map_is_valid( const char_map_ref map ){

    return map && ( map->magic == CHAR_MAP_MAGIC_VALUE );

}

int char_map_update( char_map_ref map, const char * identifier, const size_t length, const int value ){

    char_map_ref    node;

//  if( ! char_map_is_valid( map )) return EINVAL;

    node = char_map_find_node( map, identifier, length );

    if( node ){

        node->value = value;

        return EOK;

    }else{

        return char_map_add( map, identifier, length, value );

    }

}

/** @}

 */