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Diffstat (limited to 'c/src/libfs/src/dosfs/msdos_create.c')
-rw-r--r--c/src/libfs/src/dosfs/msdos_create.c208
1 files changed, 208 insertions, 0 deletions
diff --git a/c/src/libfs/src/dosfs/msdos_create.c b/c/src/libfs/src/dosfs/msdos_create.c
new file mode 100644
index 0000000000..4b4c7001ca
--- /dev/null
+++ b/c/src/libfs/src/dosfs/msdos_create.c
@@ -0,0 +1,208 @@
+/*
+ * Routine to create a new MSDOS filesystem node
+ *
+ * Copyright (C) 2001 OKTET Ltd., St.-Petersburg, Russia
+ * Author: Eugeny S. Mints <Eugeny.Mints@oktet.ru>
+ *
+ * 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.
+ *
+ * @(#) $Id$
+ *
+ */
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <errno.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+#include <rtems/libio_.h>
+#include <time.h>
+
+#include "fat.h"
+#include "fat_fat_operations.h"
+#include "fat_file.h"
+
+#include "msdos.h"
+
+/* msdos_creat_node --
+ * Create a new node. If a new node is file, FAT 32 Bytes Directory
+ * Entry Structure (see M$ White Paper) is initialized, free space is
+ * found in parent directory and structure is written to the disk.
+ * In case of directory, all above steps present and also new cluster
+ * is allocated for a new directory and dot and dotdot nodes are created
+ * in alloceted cluster.
+ *
+ * PARAMETERS:
+ * parent_loc - parent (directory we are going to create node in)
+ * type - new node type (file or directory)
+ * name - new node name
+ * mode - mode
+ *
+ * RETURNS:
+ * RC_OK on success, or -1 if error occured (errno set appropriately).
+ *
+ */
+int
+msdos_creat_node(
+ rtems_filesystem_location_info_t *parent_loc,
+ msdos_node_type_t type,
+ char *name,
+ mode_t mode
+ )
+{
+ int rc = RC_OK;
+ ssize_t ret = 0;
+ msdos_fs_info_t *fs_info = parent_loc->mt_entry->fs_info;
+ fat_file_fd_t *parent_fat_fd = parent_loc->node_access;
+ fat_file_fd_t *fat_fd = NULL;
+ time_t time_ret = 0;
+ unsigned16 time_val = 0;
+ unsigned16 date = 0;
+ fat_auxiliary_t aux;
+ unsigned char new_node[MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE];
+ unsigned char dot_dotdot[MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE * 2];
+
+ memset(new_node, 0, MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE);
+ memset(dot_dotdot, 0, MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE * 2);
+
+ /* set up name */
+ strncpy(MSDOS_DIR_NAME(new_node), name, MSDOS_NAME_MAX);
+
+ /* fill reserved field */
+ *MSDOS_DIR_NT_RES(new_node) = MSDOS_RES_NT_VALUE;
+
+ /* set up last write date and time */
+ time_ret = time(NULL);
+ if ( time_ret == -1 )
+ return -1;
+
+ msdos_date_unix2dos(time_ret, &time_val, &date);
+ *MSDOS_DIR_WRITE_TIME(new_node) = CT_LE_W(time_val);
+ *MSDOS_DIR_WRITE_DATE(new_node) = CT_LE_W(date);
+
+ /* initialize directory/file size */
+ *MSDOS_DIR_FILE_SIZE(new_node) = MSDOS_INIT_DIR_SIZE;
+
+ if (type == MSDOS_DIRECTORY)
+ *MSDOS_DIR_ATTR(new_node) |= MSDOS_ATTR_DIRECTORY;
+ else
+ *MSDOS_DIR_ATTR(new_node) |= MSDOS_ATTR_ARCHIVE;
+
+ /*
+ * find free space in the parent directory and write new initialized
+ * FAT 32 Bytes Directory Entry Structure (see M$ White Paper)
+ * to the disk
+ */
+ rc = msdos_get_name_node(parent_loc, NULL, &aux, new_node);
+ if ( rc != RC_OK )
+ return rc;
+
+ /*
+ * if we create a new file we are done, if directory there are more steps
+ * to do
+ */
+ if (type == MSDOS_DIRECTORY)
+ {
+ /* open new directory as fat-file */
+ rc = fat_file_open(parent_loc->mt_entry, aux.cln, aux.ofs, &fat_fd);
+ if (rc != RC_OK)
+ goto err;
+
+ /*
+ * we opened fat-file for node we just created, so initialize fat-file
+ * descritor
+ */
+ fat_fd->info_cln = aux.cln;
+ fat_fd->info_ofs = aux.ofs;
+ fat_fd->fat_file_size = 0;
+ fat_fd->fat_file_type = FAT_DIRECTORY;
+ fat_fd->size_limit = MSDOS_MAX_DIR_LENGHT;
+
+ /*
+ * dot and dotdot entries are identical to new node except the
+ * names
+ */
+ memcpy(DOT_NODE_P(dot_dotdot), new_node,
+ MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE);
+ memcpy(DOTDOT_NODE_P(dot_dotdot), new_node,
+ MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE);
+ memcpy(MSDOS_DIR_NAME(DOT_NODE_P(dot_dotdot)), MSDOS_DOT_NAME,
+ MSDOS_NAME_MAX);
+ memcpy(MSDOS_DIR_NAME(DOTDOT_NODE_P(dot_dotdot)), MSDOS_DOTDOT_NAME,
+ MSDOS_NAME_MAX);
+
+ /* set up cluster num for dotdot entry */
+ /*
+ * here we can ommit FAT32 condition because for all FAT types dirs
+ * right under root dir should contain 0 in dotdot entry but for
+ * FAT12/16 parent_fat_fd->cluster_num always contains such value
+ */
+ if ((FAT_FD_OF_ROOT_DIR(parent_fat_fd)) &&
+ (fs_info->fat.vol.type & FAT_FAT32))
+ {
+ *MSDOS_DIR_FIRST_CLUSTER_LOW(DOTDOT_NODE_P(dot_dotdot)) = 0x0000;
+ *MSDOS_DIR_FIRST_CLUSTER_HI(DOTDOT_NODE_P(dot_dotdot)) = 0x0000;
+ }
+ else
+ {
+ *MSDOS_DIR_FIRST_CLUSTER_LOW(DOTDOT_NODE_P(dot_dotdot)) =
+ CT_LE_W((unsigned16)((parent_fat_fd->cln) & 0x0000FFFF));
+ *MSDOS_DIR_FIRST_CLUSTER_HI(DOTDOT_NODE_P(dot_dotdot)) =
+ CT_LE_W((unsigned16)(((parent_fat_fd->cln) & 0xFFFF0000)>>16));
+ }
+
+ /*
+ * write dot and dotdot entries to new fat-file: currently fat-file
+ * correspondes to a new node is zero length, so it will be extended
+ * by one cluster and entries will be written
+ */
+ ret = fat_file_write(parent_loc->mt_entry, fat_fd, 0,
+ MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE * 2,
+ dot_dotdot);
+ if (ret < 0)
+ {
+ rc = -1;
+ goto error;
+ }
+
+ /* increment fat-file size by cluster size */
+ fat_fd->fat_file_size += fs_info->fat.vol.bpc;
+
+ /* set up cluster num for dot entry */
+ *MSDOS_DIR_FIRST_CLUSTER_LOW(DOT_NODE_P(dot_dotdot)) =
+ CT_LE_W((unsigned16)((fat_fd->cln) & 0x0000FFFF));
+ *MSDOS_DIR_FIRST_CLUSTER_HI(DOT_NODE_P(dot_dotdot)) =
+ CT_LE_W((unsigned16)(((fat_fd->cln) & 0xFFFF0000) >> 16));
+
+ /* rewrite dot entry */
+ ret = fat_file_write(parent_loc->mt_entry, fat_fd, 0,
+ MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE,
+ DOT_NODE_P(dot_dotdot));
+ if (ret < 0)
+ {
+ rc = -1;
+ goto error;
+ }
+
+ /* write first cluster num of a new directory to disk */
+ rc = msdos_set_first_cluster_num(parent_loc->mt_entry, fat_fd);
+ if (rc != RC_OK)
+ goto error;
+
+ fat_file_close(parent_loc->mt_entry, fat_fd);
+ }
+ return RC_OK;
+
+error:
+ fat_file_close(parent_loc->mt_entry, fat_fd);
+
+err:
+ /* mark 32bytes structure on the disk as free */
+ msdos_set_first_char4file_name(parent_loc->mt_entry, aux.cln, aux.ofs,
+ 0xE5);
+ return rc;
+}
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