source: rtems/cpukit/libfs/src/imfs/imfs_symlink.c @ 24ec25d

/**
 * @file
 *
 * @brief IMFS Create a New Symbolic Link Node
 * @ingroup IMFS
 */

/*
 *  COPYRIGHT (c) 1989-2009.
 *  On-Line Applications Research Corporation (OAR).
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.rtems.org/license/LICENSE.
 */

#if HAVE_CONFIG_H
  #include "config.h"
#endif

#include "imfs.h"

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

static const IMFS_node_control IMFS_node_control_sym_link;

int IMFS_symlink(
  const rtems_filesystem_location_info_t *parentloc,
  const char *name,
  size_t namelen,
  const char *target
)
{
  char         *dup_target;
  IMFS_jnode_t *new_node;

  /*
   * Duplicate link name
   */
  dup_target = strdup(target);
  if (dup_target == NULL) {
    rtems_set_errno_and_return_minus_one(ENOMEM);
  }

  /*
   *  Create a new link node.
   */
  new_node = IMFS_create_node(
    parentloc,
    &IMFS_node_control_sym_link,
    sizeof( IMFS_sym_link_t ),
    name,
    namelen,
    ( S_IFLNK | ( S_IRWXU | S_IRWXG | S_IRWXO )),
    dup_target
  );

  if (new_node == NULL) {
    free(dup_target);
    rtems_set_errno_and_return_minus_one(ENOMEM);
  }

  return 0;
}

ssize_t IMFS_readlink(
  const rtems_filesystem_location_info_t *loc,
  char *buf,
  size_t bufsize
)
{
  IMFS_sym_link_t   *sym_link;
  ssize_t            i;

  sym_link = loc->node_access;

  for( i=0; ((i<bufsize) && (sym_link->name[i] != '\0')); i++ )
    buf[i] = sym_link->name[i];

  return i;
}

static int IMFS_stat_sym_link(
  const rtems_filesystem_location_info_t *loc,
  struct stat *buf
)
{
  const IMFS_sym_link_t *sym_link = loc->node_access;

  buf->st_size = strlen( sym_link->name );

  return IMFS_stat( loc, buf );
}

static const rtems_filesystem_file_handlers_r IMFS_link_handlers = {
  .open_h = rtems_filesystem_default_open,
  .close_h = rtems_filesystem_default_close,
  .read_h = rtems_filesystem_default_read,
  .write_h = rtems_filesystem_default_write,
  .ioctl_h = rtems_filesystem_default_ioctl,
  .lseek_h = rtems_filesystem_default_lseek,
  .fstat_h = IMFS_stat_sym_link,
  .ftruncate_h = rtems_filesystem_default_ftruncate,
  .fsync_h = rtems_filesystem_default_fsync_or_fdatasync,
  .fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync,
  .fcntl_h = rtems_filesystem_default_fcntl,
  .kqfilter_h = rtems_filesystem_default_kqfilter,
  .poll_h = rtems_filesystem_default_poll,
  .readv_h = rtems_filesystem_default_readv,
  .writev_h = rtems_filesystem_default_writev
};

static IMFS_jnode_t *IMFS_node_initialize_sym_link(
  IMFS_jnode_t *node,
  void *arg
)
{
  IMFS_sym_link_t *sym_link = (IMFS_sym_link_t *) node;

  sym_link->name = arg;

  return node;
}

static void IMFS_node_destroy_sym_link( IMFS_jnode_t *node )
{
  IMFS_sym_link_t *sym_link = (IMFS_sym_link_t *) node;

  free( sym_link->name );

  IMFS_node_destroy_default( node );
}

static const IMFS_node_control IMFS_node_control_sym_link = {
  .handlers = &IMFS_link_handlers,
  .node_initialize = IMFS_node_initialize_sym_link,
  .node_remove = IMFS_node_remove_default,
  .node_destroy = IMFS_node_destroy_sym_link
};