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/*

 * Copyright (c) 2008 Jakub Jermar

 * 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 libc

 * @{

 */

/** @file

 */

#include <vfs/vfs.h>

#include <vfs/canonify.h>

#include <stdlib.h>

#include <unistd.h>

#include <dirent.h>

#include <fcntl.h>

#include <sys/stat.h>

#include <stdio.h>

#include <sys/types.h>

#include <ipc/ipc.h>

#include <ipc/services.h>

#include <async.h>

#include <atomic.h>

#include <futex.h>

#include <errno.h>

#include <string.h>

#include <ipc/devmap.h>

#include "../../../srv/vfs/vfs.h"

int vfs_phone = -1;

futex_t vfs_phone_futex = FUTEX_INITIALIZER;

futex_t cwd_futex = FUTEX_INITIALIZER;

DIR *cwd_dir = NULL;

char *cwd_path = NULL;

size_t cwd_len = 0;

char *absolutize(const char *path, size_t *retlen)

{

    char *ncwd_path;

    char *ncwd_path_nc;

    futex_down(&cwd_futex);

    size_t len = strlen(path);

    if (*path != '/') {

        if (!cwd_path) {

            futex_up(&cwd_futex);

            return NULL;

        }

        ncwd_path_nc = malloc(cwd_len + 1 + len + 1);

        if (!ncwd_path_nc) {

            futex_up(&cwd_futex);

            return NULL;

        }

        strcpy(ncwd_path_nc, cwd_path);

        ncwd_path_nc[cwd_len] = '/';

        ncwd_path_nc[cwd_len + 1] = '\0';

    } else {

        ncwd_path_nc = malloc(len + 1);

        if (!ncwd_path_nc) {

            futex_up(&cwd_futex);

            return NULL;

        }

        ncwd_path_nc[0] = '\0';

    }

    strcat(ncwd_path_nc, path);

    ncwd_path = canonify(ncwd_path_nc, retlen);

    if (!ncwd_path) {

        futex_up(&cwd_futex);

        free(ncwd_path_nc);

        return NULL;

    }

    /*

     * We need to clone ncwd_path because canonify() works in-place and thus

     * the address in ncwd_path need not be the same as ncwd_path_nc, even

     * though they both point into the same dynamically allocated buffer.

     */

    ncwd_path = strdup(ncwd_path);

    free(ncwd_path_nc);

    if (!ncwd_path) {

        futex_up(&cwd_futex);

        return NULL;

    }

    futex_up(&cwd_futex);

    return ncwd_path;

}

static void vfs_connect(void)

{

    while (vfs_phone < 0)

        vfs_phone = ipc_connect_me_to_blocking(PHONE_NS, SERVICE_VFS, 0, 0);

}

static int device_get_handle(const char *name, dev_handle_t *handle,

    const unsigned int flags)

{

    int phone;

    if (flags & IPC_FLAG_BLOCKING)

        phone = ipc_connect_me_to_blocking(PHONE_NS, SERVICE_DEVMAP, DEVMAP_CLIENT, 0);

    else

        phone = ipc_connect_me_to(PHONE_NS, SERVICE_DEVMAP, DEVMAP_CLIENT, 0);

    if (phone < 0)

        return phone;

    ipc_call_t answer;

    aid_t req = async_send_2(phone, DEVMAP_DEVICE_GET_HANDLE, flags, 0,

        &answer);

    ipcarg_t retval = ipc_data_write_start(phone, name, strlen(name) + 1);

    if (retval != EOK) {

        async_wait_for(req, NULL);

        ipc_hangup(phone);

        return retval;

    }

    async_wait_for(req, &retval);

    if (handle != NULL)

        *handle = -1;

    if (retval == EOK) {

        if (handle != NULL)

            *handle = (dev_handle_t) IPC_GET_ARG1(answer);

    }

    ipc_hangup(phone);

    return retval;

}

int mount(const char *fs_name, const char *mp, const char *dev,

    const unsigned int flags)

{

    int res;

    ipcarg_t rc;

    aid_t req;

    dev_handle_t dev_handle;

    res = device_get_handle(dev, &dev_handle, flags);

    if (res != EOK)

        return res;

    size_t mpa_len;

    char *mpa = absolutize(mp, &mpa_len);

    if (!mpa)

        return ENOMEM;

    futex_down(&vfs_phone_futex);

    async_serialize_start();

    vfs_connect();

    req = async_send_2(vfs_phone, VFS_MOUNT, dev_handle, flags, NULL);

    rc = ipc_data_write_start(vfs_phone, (void *) mpa, mpa_len);

    if (rc != EOK) {

        async_wait_for(req, NULL);

        async_serialize_end();

        futex_up(&vfs_phone_futex);

        free(mpa);

        return (int) rc;

    }

    rc = ipc_data_write_start(vfs_phone, (void *) fs_name, strlen(fs_name));

    if (rc != EOK) {

        async_wait_for(req, NULL);

        async_serialize_end();

        futex_up(&vfs_phone_futex);

        free(mpa);

        return (int) rc;

    }

    async_wait_for(req, &rc);

    async_serialize_end();

    futex_up(&vfs_phone_futex);

    free(mpa);

    return (int) rc;

}

static int _open(const char *path, int lflag, int oflag, ...)

{

    ipcarg_t rc;

    ipc_call_t answer;

    aid_t req;

    size_t pa_len;

    char *pa = absolutize(path, &pa_len);

    if (!pa)

        return ENOMEM;

    futex_down(&vfs_phone_futex);

    async_serialize_start();

    vfs_connect();

    req = async_send_3(vfs_phone, VFS_OPEN, lflag, oflag, 0, &answer);

    rc = ipc_data_write_start(vfs_phone, pa, pa_len);

    if (rc != EOK) {

        async_wait_for(req, NULL);

        async_serialize_end();

        futex_up(&vfs_phone_futex);

        free(pa);

        return (int) rc;

    }

    async_wait_for(req, &rc);

    async_serialize_end();

    futex_up(&vfs_phone_futex);

    free(pa);

    if (rc != EOK)

        return (int) rc;

    return (int) IPC_GET_ARG1(answer);

}

int open(const char *path, int oflag, ...)

{

    return _open(path, L_FILE, oflag);

}

int close(int fildes)

{

    ipcarg_t rc;

    futex_down(&vfs_phone_futex);

    async_serialize_start();

    vfs_connect();

    rc = async_req_1_0(vfs_phone, VFS_CLOSE, fildes);

    async_serialize_end();

    futex_up(&vfs_phone_futex);

    return (int)rc;

}

ssize_t read(int fildes, void *buf, size_t nbyte)

{

    ipcarg_t rc;

    ipc_call_t answer;

    aid_t req;

    futex_down(&vfs_phone_futex);

    async_serialize_start();

    vfs_connect();

    req = async_send_1(vfs_phone, VFS_READ, fildes, &answer);

    rc = ipc_data_read_start(vfs_phone, (void *)buf, nbyte);

    if (rc != EOK) {

        async_wait_for(req, NULL);

        async_serialize_end();

        futex_up(&vfs_phone_futex);

        return (ssize_t) rc;

    }

    async_wait_for(req, &rc);

    async_serialize_end();

    futex_up(&vfs_phone_futex);

    if (rc == EOK)

        return (ssize_t) IPC_GET_ARG1(answer);

    else

        return rc;

}

ssize_t write(int fildes, const void *buf, size_t nbyte)

{

    ipcarg_t rc;

    ipc_call_t answer;

    aid_t req;

    futex_down(&vfs_phone_futex);

    async_serialize_start();

    vfs_connect();

    req = async_send_1(vfs_phone, VFS_WRITE, fildes, &answer);

    rc = ipc_data_write_start(vfs_phone, (void *)buf, nbyte);

    if (rc != EOK) {

        async_wait_for(req, NULL);

        async_serialize_end();

        futex_up(&vfs_phone_futex);

        return (ssize_t) rc;

    }

    async_wait_for(req, &rc);

    async_serialize_end();

    futex_up(&vfs_phone_futex);

    if (rc == EOK)

        return (ssize_t) IPC_GET_ARG1(answer);

    else

        return -1;

}

off_t lseek(int fildes, off_t offset, int whence)

{

    ipcarg_t rc;

    futex_down(&vfs_phone_futex);

    async_serialize_start();

    vfs_connect();

    ipcarg_t newoffs;

    rc = async_req_3_1(vfs_phone, VFS_SEEK, fildes, offset, whence,

        &newoffs);

    async_serialize_end();

    futex_up(&vfs_phone_futex);

    if (rc != EOK)

        return (off_t) -1;

    return (off_t) newoffs;

}

int ftruncate(int fildes, off_t length)

{

    ipcarg_t rc;

    futex_down(&vfs_phone_futex);

    async_serialize_start();

    vfs_connect();

    rc = async_req_2_0(vfs_phone, VFS_TRUNCATE, fildes, length);

    async_serialize_end();

    futex_up(&vfs_phone_futex);

    return (int) rc;

}

DIR *opendir(const char *dirname)

{

    DIR *dirp = malloc(sizeof(DIR));

    if (!dirp)

        return NULL;

    dirp->fd = _open(dirname, L_DIRECTORY, 0);

    if (dirp->fd < 0) {

        free(dirp);

        return NULL;

    }

    return dirp;

}

struct dirent *readdir(DIR *dirp)

{

    ssize_t len = read(dirp->fd, &dirp->res.d_name[0], NAME_MAX + 1);

    if (len <= 0)

        return NULL;

    return &dirp->res;

}

void rewinddir(DIR *dirp)

{

    (void) lseek(dirp->fd, 0, SEEK_SET);

}

int closedir(DIR *dirp)

{

    (void) close(dirp->fd);

    free(dirp);

    return 0;

}

int mkdir(const char *path, mode_t mode)

{

    ipcarg_t rc;

    aid_t req;

    size_t pa_len;

    char *pa = absolutize(path, &pa_len);

    if (!pa)

        return ENOMEM;

    futex_down(&vfs_phone_futex);

    async_serialize_start();

    vfs_connect();

    req = async_send_1(vfs_phone, VFS_MKDIR, mode, NULL);

    rc = ipc_data_write_start(vfs_phone, pa, pa_len);

    if (rc != EOK) {

        async_wait_for(req, NULL);

        async_serialize_end();

        futex_up(&vfs_phone_futex);

        free(pa);

        return (int) rc;

    }

    async_wait_for(req, &rc);

    async_serialize_end();

    futex_up(&vfs_phone_futex);

    free(pa);

    return rc;

}

static int _unlink(const char *path, int lflag)

{

    ipcarg_t rc;

    aid_t req;

    size_t pa_len;

    char *pa = absolutize(path, &pa_len);

    if (!pa)

        return ENOMEM;

    futex_down(&vfs_phone_futex);

    async_serialize_start();

    vfs_connect();

    req = async_send_0(vfs_phone, VFS_UNLINK, NULL);

    rc = ipc_data_write_start(vfs_phone, pa, pa_len);

    if (rc != EOK) {

        async_wait_for(req, NULL);

        async_serialize_end();

        futex_up(&vfs_phone_futex);

        free(pa);

        return (int) rc;

    }

    async_wait_for(req, &rc);

    async_serialize_end();

    futex_up(&vfs_phone_futex);

    free(pa);

    return rc;

}

int unlink(const char *path)

{

    return _unlink(path, L_NONE);

}

int rmdir(const char *path)

{

    return _unlink(path, L_DIRECTORY);

}

int rename(const char *old, const char *new)

{

    ipcarg_t rc;

    aid_t req;

    size_t olda_len;

    char *olda = absolutize(old, &olda_len);

    if (!olda)

        return ENOMEM;

    size_t newa_len;

    char *newa = absolutize(new, &newa_len);

    if (!newa) {

        free(olda);

        return ENOMEM;

    }

    futex_down(&vfs_phone_futex);

    async_serialize_start();

    vfs_connect();

    req = async_send_0(vfs_phone, VFS_RENAME, NULL);

    rc = ipc_data_write_start(vfs_phone, olda, olda_len);

    if (rc != EOK) {

        async_wait_for(req, NULL);

        async_serialize_end();

        futex_up(&vfs_phone_futex);

        free(olda);

        free(newa);

        return (int) rc;

    }

    rc = ipc_data_write_start(vfs_phone, newa, newa_len);

    if (rc != EOK) {

        async_wait_for(req, NULL);

        async_serialize_end();

        futex_up(&vfs_phone_futex);

        free(olda);

        free(newa);

        return (int) rc;

    }

    async_wait_for(req, &rc);

    async_serialize_end();

    futex_up(&vfs_phone_futex);

    free(olda);

    free(newa);

    return rc;

}

int chdir(const char *path)

{

    size_t pa_len;

    char *pa = absolutize(path, &pa_len);

    if (!pa)

        return ENOMEM;

    DIR *d = opendir(pa);

    if (!d) {

        free(pa);

        return ENOENT;

    }

    futex_down(&cwd_futex);

    if (cwd_dir) {

        closedir(cwd_dir);

        cwd_dir = NULL;

        free(cwd_path);

        cwd_path = NULL;

        cwd_len = 0;

    }

    cwd_dir = d;

    cwd_path = pa;

    cwd_len = pa_len;

    futex_up(&cwd_futex);

    return EOK;

}

char *getcwd(char *buf, size_t size)

{

    if (!size)

        return NULL;

    futex_down(&cwd_futex);

    if (size < cwd_len + 1) {

        futex_up(&cwd_futex);

        return NULL;

    }

    strcpy(buf, cwd_path);

    futex_up(&cwd_futex);

    return buf;

}

/** @}

 */