btstack/platform/daemon/rfcomm_service_db_memory.c

/*
 * Copyright (C) 2014 BlueKitchen GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of the copyright holders nor the names of
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 * 4. Any redistribution, use, or modification is done solely for
 *    personal benefit and not for any commercial purpose or for
 *    monetary gain.
 *
 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
 * ``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 MATTHIAS
 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * Please inquire about commercial licensing options at 
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 */

#include <string.h>
#include <stdlib.h>

#include "rfcomm_service_db.h"
#include "btstack_memory.h"
#include "debug.h"

#include "utils.h"
#include "btstack_linked_list.h"

// This lists should be only accessed by tests.
static btstack_btstack_linked_list_t db_mem_services = NULL;

// Device info
static void db_open(void){
}

static void db_close(void){ 
}

// MARK: PERSISTENT RFCOMM CHANNEL ALLOCATION
uint8_t rfcomm_service_db_channel_for_service(const char *serviceName){
    
    btstack_linked_item_t *it;
    db_mem_service_t * item;
    uint8_t max_channel = 1;

    for (it = (btstack_linked_item_t *) db_mem_services; it ; it = it->next){
        item = (db_mem_service_t *) it;
        if (strncmp(item->service_name, serviceName, MAX_NAME_LEN) == 0) {
            // Match found
            return item->channel;
        }

        // TODO prevent overflow
        if (item->channel >= max_channel) max_channel = item->channel + 1;
    }

    // Allocate new persistant channel
    db_mem_service_t * newItem = btstack_memory_db_mem_service_get();

    if (!newItem) return 0;
    
    strncpy(newItem->service_name, serviceName, MAX_NAME_LEN);
    newItem->channel = max_channel;
    btstack_linked_list_add(&db_mem_services, (btstack_linked_item_t *) newItem);
    return max_channel;
}