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/*

 * Copyright (C) 2006 Josef Cejka

 * Copyright (C) 2006 Jakub Vana

 * 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 <io/io.h>

#include <io/stream.h>

#include <string.h>

#include <malloc.h>

#include <libc.h>

#include <ipc/ipc.h>

#include <ipc/ns.h>

#include <ipc/fb.h>

#include <ipc/services.h>

#include <console.h>

#include <unistd.h>

#include <async.h>

#define FDS 32

typedef struct stream_t {

    pwritefn_t w;

    preadfn_t r;

    void * param;

    int phone;

} stream_t;

static int console_phone = -1;

static stream_t streams[FDS] = {{0, 0, 0, -1}};

static ssize_t write_stderr(void *param, const void *buf, size_t count)

{

    return count;

}

static ssize_t read_stdin(void *param, void *buf, size_t count)

{

    ipcarg_t r0,r1;

    size_t i = 0;

    while (i < count) {

        if (sync_send_2(streams[0].phone, CONSOLE_GETCHAR, 0, 0, &r0, &r1) < 0) {

            return -1;

        }

        ((char *)buf)[i++] = r0;

    }

    return i;

}

static ssize_t write_stdout(void *param, const void *buf, size_t count)

{

    int i;

    ipcarg_t r0,r1;

    for (i = 0; i < count; i++)

        send_call(streams[1].phone, CONSOLE_PUTCHAR, ((const char *)buf)[i]);

    return count;

}

static stream_t open_stdin(void)

{

    stream_t stream;

    int phoneid;

    int res;

    if (console_phone < 0) {

        while ((console_phone = ipc_connect_me_to(PHONE_NS, SERVICE_CONSOLE, 0)) < 0) {

            usleep(10000);

        }

    }

    stream.r = read_stdin;

    stream.param = 0;

    stream.phone = console_phone;

    return stream;

}

static stream_t open_stdout(void)

{

    stream_t stream;

    int res;

    if (console_phone < 0) {

        while ((console_phone = ipc_connect_me_to(PHONE_NS, SERVICE_CONSOLE, 0)) < 0) {

            usleep(10000);

        }

    }

    stream.w = write_stdout;

    stream.param = 0;

    return stream;

}

static ssize_t write_null(void *param, const void *buf, size_t count)

{

    return count;

}

fd_t open(const char *fname, int flags)

{

    int c = 0;

    while (((streams[c].w) || (streams[c].r)) && (c < FDS))

        c++;

    if (c == FDS)

        return EMFILE;

    if (!strcmp(fname, "stdin")) {

        streams[c] = open_stdin();

        return c;

    }

    if (!strcmp(fname, "stdout")) {

        streams[c] = open_stdout();

        return c;

    }

    if (!strcmp(fname, "stderr")) {

        streams[c].w = write_stderr;

        return c;

    }

    if (!strcmp(fname, "null")) {

        streams[c].w = write_null;

        return c;

    }

}

ssize_t write(int fd, const void *buf, size_t count)

{

    if (fd < FDS)

        return streams[fd].w(streams[fd].param, buf, count);

    return 0;

}

ssize_t read(int fd, void *buf, size_t count)

{

    if (fd < FDS)

        return streams[fd].r(streams[fd].param, buf, count);

    return 0;

}

int get_fd_phone(int fd)

{

    if (fd >= FDS || fd < 0)

        return -1;

    return streams[fd].phone;

}