src/dosfs/msdos_eval.c

0001 /**
0002  * @file
0003  *
0004  * @ingroup DOSFS
0005  *
0006  * @brief MSDOS Evaluation Routines
0007  */
0008
0009 /*
0010  *  Copyright (C) 2001 OKTET Ltd., St.-Petersburg, Russia
0011  *  Author: Eugeny S. Mints <Eugeny.Mints@oktet.ru>
0012  *
0013  *  The license and distribution terms for this file may be
0014  *  found in the file LICENSE in this distribution or at
0015  *  http://www.rtems.org/license/LICENSE.
0016  */
0017
0018 #ifdef HAVE_CONFIG_H
0019 #include "config.h"
0020 #endif
0021
0022 #include <sys/types.h>
0023 #include <sys/stat.h>
0024 #include <fcntl.h>
0025 #include <unistd.h>
0026 #include <errno.h>
0027 #include <stdlib.h>
0028
0029 #include <rtems/libio_.h>
0030
0031 #include "fat.h"
0032 #include "fat_fat_operations.h"
0033 #include "fat_file.h"
0034
0035 #include "msdos.h"
0036
0037 /* msdos_set_handlers --
0038  *     Set handlers for the node with specified type(i.e. handlers for file
0039  *     or directory).
0040  *
0041  * PARAMETERS:
0042  *     loc - node description
0043  *
0044  * RETURNS:
0045  *     None
0046  */
0047 static void
0048 msdos_set_handlers(rtems_filesystem_location_info_t *loc)
0049 {
0050     msdos_fs_info_t *fs_info = loc->mt_entry->fs_info;
0051     fat_file_fd_t   *fat_fd = loc->node_access;
0052
0053     if (fat_fd->fat_file_type == FAT_DIRECTORY)
0054         loc->handlers = fs_info->directory_handlers;
0055     else
0056         loc->handlers = fs_info->file_handlers;
0057 }
0058
0059 static bool msdos_is_directory(
0060   rtems_filesystem_eval_path_context_t *ctx,
0061   void *arg
0062 )
0063 {
0064   rtems_filesystem_location_info_t *currentloc =
0065     rtems_filesystem_eval_path_get_currentloc( ctx );
0066   fat_file_fd_t *fat_fd = currentloc->node_access;
0067
0068   return fat_fd->fat_file_type == FAT_DIRECTORY;
0069 }
0070
0071 static rtems_filesystem_eval_path_generic_status msdos_eval_token(
0072   rtems_filesystem_eval_path_context_t *ctx,
0073   void *arg,
0074   const char *token,
0075   size_t tokenlen
0076 )
0077 {
0078   rtems_filesystem_eval_path_generic_status status =
0079     RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_DONE;
0080
0081   if (rtems_filesystem_is_current_directory(token, tokenlen)) {
0082     rtems_filesystem_eval_path_clear_token(ctx);
0083     status = RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_CONTINUE;
0084   } else {
0085     rtems_filesystem_location_info_t *currentloc =
0086       rtems_filesystem_eval_path_get_currentloc(ctx);
0087     int rc = msdos_find_name(currentloc, token, tokenlen);
0088
0089     if (rc == RC_OK) {
0090       rtems_filesystem_eval_path_clear_token(ctx);
0091       msdos_set_handlers(currentloc);
0092       if (rtems_filesystem_eval_path_has_path(ctx)) {
0093         status = RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_CONTINUE;
0094       }
0095     } else if (rc == MSDOS_NAME_NOT_FOUND_ERR) {
0096       status = RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_NO_ENTRY;
0097     } else {
0098       rtems_filesystem_eval_path_error(ctx, 0);
0099     }
0100   }
0101
0102   return status;
0103 }
0104
0105 static const rtems_filesystem_eval_path_generic_config msdos_eval_config = {
0106   .is_directory = msdos_is_directory,
0107   .eval_token = msdos_eval_token
0108 };
0109
0110 void msdos_eval_path(rtems_filesystem_eval_path_context_t *ctx)
0111 {
0112   rtems_filesystem_eval_path_generic(ctx, NULL, &msdos_eval_config);
0113 }