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/*

 *  Libio Internal Information

 *

 *  COPYRIGHT (c) 1989-1999.

 *  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.OARcorp.com/rtems/license.html.

 *

 *  $Id: libio_.h,v 1.2 2001-09-27 12:01:15 chris Exp $

 */

#ifndef __LIBIO__h

#define __LIBIO__h

#ifdef __cplusplus

extern "C" {

#endif

#include <rtems.h>

#include <rtems/libio.h>                /* include before standard IO */

#include <rtems/assoc.h>                /* assoc.h not included by rtems.h */

#include <stdio.h>                      /* O_RDONLY, et.al. */

#include <fcntl.h>                      /* O_RDONLY, et.al. */

#include <assert.h>

#include <stdarg.h>

#include <errno.h>

#if ! defined(O_NDELAY)

# if defined(solaris2)

#  define O_NDELAY O_NONBLOCK

# elif defined(RTEMS_NEWLIB)

#  define O_NDELAY _FNBIO

# endif

#endif

#if !defined(ENOTSUP)

#define ENOTSUP EOPNOTSUPP

#endif

#include <errno.h>

#include <string.h>                     /* strcmp */

#include <unistd.h>

#include <stdlib.h>                     /* calloc() */

/*

 *  Semaphore to protect the io table

 */

#define RTEMS_LIBIO_SEM         rtems_build_name('L', 'B', 'I', 'O')

#define RTEMS_LIBIO_IOP_SEM(n)  rtems_build_name('L', 'B', 'I', n)

extern rtems_id                          rtems_libio_semaphore;

extern rtems_filesystem_file_handlers_r  rtems_filesystem_null_handlers;

/*

 *  File descriptor Table Information

 */

extern unsigned32      rtems_libio_number_iops;

extern rtems_libio_t  *rtems_libio_iops;

extern rtems_libio_t  *rtems_libio_last_iop;

extern rtems_libio_t *rtems_libio_iop_freelist;

/*

 *  Default mode for all files.

 */

extern mode_t    rtems_filesystem_umask;

/*

 *  set_errno_and_return_minus_one

 *

 *  Macro to ease common way to return an error.

 */

#ifndef set_errno_and_return_minus_one

#define set_errno_and_return_minus_one( _error ) \

  do { errno = (_error); return -1; } while(0)

#endif

/*

 *  rtems_libio_iop

 *

 *  Macro to return the file descriptor pointer.

 */

#define rtems_libio_iop(_fd) \

  ((((unsigned32)(_fd)) < rtems_libio_number_iops) ? \

         &rtems_libio_iops[_fd] : 0)

/*

 *  rtems_libio_check_is_open

 *

 *  Macro to check if a file descriptor is actually open.

 */

#define rtems_libio_check_is_open(_iop) \

  do {                                               \

      if (((_iop)->flags & LIBIO_FLAGS_OPEN) == 0) { \

          errno = EBADF;                             \

          return -1;                                 \

      }                                              \

  } while (0)

/*

 *  rtems_libio_check_fd

 *

 *  Macro to check if a file descriptor number is valid.

 */

#define rtems_libio_check_fd(_fd) \

  do {                                                     \

      if ((unsigned32) (_fd) >= rtems_libio_number_iops) { \

          errno = EBADF;                                   \

          return -1;                                       \

      }                                                    \

  } while (0)

/*

 *  rtems_libio_check_buffer

 *

 *  Macro to check if a buffer pointer is valid.

 */

#define rtems_libio_check_buffer(_buffer) \

  do {                                    \

      if ((_buffer) == 0) {               \

          errno = EINVAL;                 \

          return -1;                      \

      }                                   \

  } while (0)

/*

 *  rtems_libio_check_count

 *

 *  Macro to check if a count or length is valid.

 */

#define rtems_libio_check_count(_count) \

  do {                                  \

      if ((_count) == 0) {              \

          return 0;                     \

      }                                 \

  } while (0)

/*

 *  rtems_libio_check_permissions

 *

 *  Macro to check if a file descriptor is open for this operation.

 */

#define rtems_libio_check_permissions(_iop, _flag)    \

  do {                                                \

      if (((_iop)->flags & (_flag)) == 0) {           \

            set_errno_and_return_minus_one( EINVAL ); \

            return -1;                                \

      }                                               \

  } while (0)

/*

 *  rtems_filesystem_freenode

 *

 *  Macro to free a node.

 */

#define rtems_filesystem_freenode( _node ) \

  do { \

    if ( (_node)->ops->freenod ) \

      (*(_node)->ops->freenod)( (_node) ); \

  } while (0)

/*

 *  rtems_filesystem_is_separator

 *

 *  Macro to determine if a character is a path name separator.

 *

 *  NOTE:  This macro handles MS-DOS and UNIX style names.

 */

#define rtems_filesystem_is_separator( _ch ) \

   ( ((_ch) == '/') || ((_ch) == '\\') || ((_ch) == '\0'))

/*

 *  rtems_filesystem_get_start_loc

 *

 *  Macro to determine if path is absolute or relative.

 */

#define rtems_filesystem_get_start_loc( _path, _index, _loc )  \

  do {                                                         \

    if ( rtems_filesystem_is_separator( (_path)[ 0 ] ) ) {     \

      *(_loc) = rtems_filesystem_root;                         \

      *(_index) = 1;                                           \

    } else {                                                   \

      *(_loc) = rtems_filesystem_current;                      \

      *(_index) = 0;                                           \

    }                                                          \

  } while (0)

#define rtems_filesystem_get_sym_start_loc( _path, _index, _loc )  \

  do {                                                         \

    if ( rtems_filesystem_is_separator( (_path)[ 0 ] ) ) {     \

      *(_loc) = rtems_filesystem_root;                         \

      *(_index) = 1;                                           \

    } else {                                                   \

      *(_index) = 0;                                           \

    }                                                          \

  } while (0)

/*

 *  External structures

 */

extern rtems_filesystem_location_info_t rtems_filesystem_current;

extern rtems_filesystem_location_info_t rtems_filesystem_root;

extern nlink_t                          rtems_filesystem_link_counts;

/*

 *  File Descriptor Routine Prototypes

 */

rtems_libio_t *rtems_libio_allocate(void);

unsigned32 rtems_libio_fcntl_flags(

  unsigned32 fcntl_flags

);

unsigned32 rtems_libio_to_fcntl_flags(

  unsigned32 flags

);

void rtems_libio_free(

  rtems_libio_t *iop

);

int rtems_libio_is_open_files_in_fs(

  rtems_filesystem_mount_table_entry_t *mt_entry

);

int rtems_libio_is_file_open(

  void  *node_access

);

/*

 *  File System Routine Prototypes

 */

int rtems_filesystem_evaluate_path(

  const char                        *pathname,

  int                                flags,

  rtems_filesystem_location_info_t  *pathloc,

  int                                follow_link

);

void rtems_filesystem_initialize();

int init_fs_mount_table();

#ifdef __cplusplus

}

#endif

#endif

/* end of include file */