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/*

 *  IMFS_get_token

 *

 *  Routine to get a token (name or separator) from the path

 *  the length of the token is returned in token_len.

 *

 *  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.

 *

 *  imfs_gtkn.c,v 1.8 2002/04/08 18:28:59 joel Exp

 */

#if HAVE_CONFIG_H

#include "config.h"

#endif

#include <stdlib.h>

#include <string.h>

#include "imfs.h"

#include <rtems/libio_.h>

IMFS_token_types IMFS_get_token(

  const char       *path,

  char             *token,

  int              *token_len

)

{

  register int i = 0;

  IMFS_token_types  type = IMFS_NAME;

  register char c;

  /*

   *  Copy a name into token.  (Remember NULL is a token.)

   */

  c = path[i];

  while ( (!IMFS_is_separator(c)) && (i <= IMFS_NAME_MAX) ) {

     token[i] = c;

     if ( i == IMFS_NAME_MAX )

       return IMFS_INVALID_TOKEN;

     if ( !IMFS_is_valid_name_char(c) )

       type = IMFS_INVALID_TOKEN;

     c = path [++i];

  }

  /*

   *  Copy a seperator into token.

   */

  if ( i == 0 ) {

    token[i] = c;

    if ( token[i] != '\0' ) {

      i++;

      type = IMFS_CURRENT_DIR;

    } else {

      type = IMFS_NO_MORE_PATH;

    }

  } else if (token[ i-1 ] != '\0') {

    token[i] = '\0';

  }

  /*

   *  Set token_len to the number of characters copied.

   */

  *token_len = i;

  /*

   *  If we copied something that was not a seperator see if

   *  it was a special name.

   */

  if ( type == IMFS_NAME ) {

    if ( strcmp( token, "..") == 0 )

      type = IMFS_UP_DIR;

    else if ( strcmp( token, "." ) == 0 )

      type = IMFS_CURRENT_DIR;

  }

  return type;

}