source: mainline/uspace/srv/clipboard/clipboard.c@ be39fc6

/*
 * Copyright (c) 2009 Martin Decky
 * 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.
 */

#include <stdio.h>
#include <stdbool.h>
#include <async.h>
#include <ns.h>
#include <ipc/services.h>
#include <ipc/clipboard.h>
#include <malloc.h>
#include <fibril_synch.h>
#include <errno.h>

#define NAME  "clipboard"

static char *clip_data = NULL;
static size_t clip_size = 0;
static clipboard_tag_t clip_tag = CLIPBOARD_TAG_NONE;
static FIBRIL_MUTEX_INITIALIZE(clip_mtx);

static void clip_put_data(ipc_callid_t rid, ipc_call_t *request)
{
        char *data;
        int rc;
        size_t size;
        
        switch (IPC_GET_ARG1(*request)) {
        case CLIPBOARD_TAG_NONE:
                fibril_mutex_lock(&clip_mtx);
                
                if (clip_data)
                        free(clip_data);
                
                clip_data = NULL;
                clip_size = 0;
                clip_tag = CLIPBOARD_TAG_NONE;
                
                fibril_mutex_unlock(&clip_mtx);
                async_answer_0(rid, EOK);
                break;
        case CLIPBOARD_TAG_DATA:
                rc = async_data_write_accept((void **) &data, false, 0, 0, 0, &size);
                if (rc != EOK) {
                        async_answer_0(rid, rc);
                        break;
                }
                
                fibril_mutex_lock(&clip_mtx);
                
                if (clip_data)
                        free(clip_data);
                
                clip_data = data;
                clip_size = size;
                clip_tag = CLIPBOARD_TAG_DATA;
                
                fibril_mutex_unlock(&clip_mtx);
                async_answer_0(rid, EOK);
                break;
        default:
                async_answer_0(rid, EINVAL);
        }
}

static void clip_get_data(ipc_callid_t rid, ipc_call_t *request)
{
        fibril_mutex_lock(&clip_mtx);
        
        ipc_callid_t callid;
        size_t size;
        
        /* Check for clipboard data tag compatibility */
        switch (IPC_GET_ARG1(*request)) {
        case CLIPBOARD_TAG_DATA:
                if (!async_data_read_receive(&callid, &size)) {
                        async_answer_0(callid, EINVAL);
                        async_answer_0(rid, EINVAL);
                        break;
                }
                
                if (clip_tag != CLIPBOARD_TAG_DATA) {
                        /* So far we only understand binary data */
                        async_answer_0(callid, EOVERFLOW);
                        async_answer_0(rid, EOVERFLOW);
                        break;
                }
                
                if (clip_size != size) {
                        /* The client expects different size of data */
                        async_answer_0(callid, EOVERFLOW);
                        async_answer_0(rid, EOVERFLOW);
                        break;
                }
                
                sysarg_t retval = async_data_read_finalize(callid, clip_data, size);
                if (retval != EOK) {
                        async_answer_0(rid, retval);
                        break;
                }
                
                async_answer_0(rid, EOK);
                break;
        default:
                /*
                 * Sorry, we don't know how to get unknown or NONE
                 * data from the clipbard
                 */
                async_answer_0(rid, EINVAL);
                break;
        }
        
        fibril_mutex_unlock(&clip_mtx);
}

static void clip_content(ipc_callid_t rid, ipc_call_t *request)
{
        fibril_mutex_lock(&clip_mtx);
        
        size_t size = clip_size;
        clipboard_tag_t tag = clip_tag;
        
        fibril_mutex_unlock(&clip_mtx);
        async_answer_2(rid, EOK, (sysarg_t) size, (sysarg_t) tag);
}

static void clip_connection(ipc_callid_t iid, ipc_call_t *icall, void *arg)
{
        /* Accept connection */
        async_answer_0(iid, EOK);
        
        while (true) {
                ipc_call_t call;
                ipc_callid_t callid = async_get_call(&call);
                
                if (!IPC_GET_IMETHOD(call))
                        break;
                
                switch (IPC_GET_IMETHOD(call)) {
                case CLIPBOARD_PUT_DATA:
                        clip_put_data(callid, &call);
                        break;
                case CLIPBOARD_GET_DATA:
                        clip_get_data(callid, &call);
                        break;
                case CLIPBOARD_CONTENT:
                        clip_content(callid, &call);
                        break;
                default:
                        async_answer_0(callid, ENOENT);
                }
        }
}

int main(int argc, char *argv[])
{
        printf("%s: HelenOS clipboard service\n", NAME);
        
        async_set_fallback_port_handler(clip_connection, NULL);
        int rc = service_register(SERVICE_CLIPBOARD);
        if (rc != EOK)
                return rc;
        
        printf("%s: Accepting connections\n", NAME);
        task_retval(0);
        async_manager();
        
        /* Never reached */
        return 0;
}