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-rw-r--r--lib/ext2fs/get_pathname.c171
1 files changed, 171 insertions, 0 deletions
diff --git a/lib/ext2fs/get_pathname.c b/lib/ext2fs/get_pathname.c
new file mode 100644
index 0000000..8cfaf6e
--- /dev/null
+++ b/lib/ext2fs/get_pathname.c
@@ -0,0 +1,171 @@
+/*
+ * get_pathname.c --- do directory/inode -> name translation
+ *
+ * Copyright (C) 1993, 1994, 1995 Theodore Ts'o.
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
+ * %End-Header%
+ */
+
+/*
+ *
+ * ext2fs_get_pathname(fs, dir, ino, name)
+ *
+ * This function translates takes two inode numbers into a
+ * string, placing the result in <name>. <dir> is the containing
+ * directory inode, and <ino> is the inode number itself. If
+ * <ino> is zero, then ext2fs_get_pathname will return pathname
+ * of the the directory <dir>.
+ *
+ */
+
+#include "config.h"
+#include <stdio.h>
+#include <string.h>
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#include "ext2_fs.h"
+#include "ext2fs.h"
+
+struct get_pathname_struct {
+ ext2_ino_t search_ino;
+ ext2_ino_t parent;
+ char *name;
+ errcode_t errcode;
+};
+
+#ifdef __TURBOC__
+ #pragma argsused
+#endif
+static int get_pathname_proc(struct ext2_dir_entry *dirent,
+ int offset EXT2FS_ATTR((unused)),
+ int blocksize EXT2FS_ATTR((unused)),
+ char *buf EXT2FS_ATTR((unused)),
+ void *priv_data)
+{
+ struct get_pathname_struct *gp;
+ errcode_t retval;
+ int name_len = ext2fs_dirent_name_len(dirent);
+
+ gp = (struct get_pathname_struct *) priv_data;
+
+ if ((name_len == 2) && !strncmp(dirent->name, "..", 2))
+ gp->parent = dirent->inode;
+ if (dirent->inode == gp->search_ino) {
+ retval = ext2fs_get_mem(name_len + 1, &gp->name);
+ if (retval) {
+ gp->errcode = retval;
+ return DIRENT_ABORT;
+ }
+ strncpy(gp->name, dirent->name, name_len);
+ gp->name[name_len] = '\0';
+ return DIRENT_ABORT;
+ }
+ return 0;
+}
+
+static errcode_t ext2fs_get_pathname_int(ext2_filsys fs, ext2_ino_t dir,
+ ext2_ino_t ino, int maxdepth,
+ char *buf, char **name)
+{
+ struct get_pathname_struct gp;
+ char *parent_name = 0, *ret;
+ errcode_t retval;
+
+ if (dir == ino) {
+ retval = ext2fs_get_mem(2, name);
+ if (retval)
+ return retval;
+ strcpy(*name, (dir == EXT2_ROOT_INO) ? "/" : ".");
+ return 0;
+ }
+
+ if (!dir || (maxdepth < 0)) {
+ retval = ext2fs_get_mem(4, name);
+ if (retval)
+ return retval;
+ strcpy(*name, "...");
+ return 0;
+ }
+
+ gp.search_ino = ino;
+ gp.parent = 0;
+ gp.name = 0;
+ gp.errcode = 0;
+
+ retval = ext2fs_dir_iterate(fs, dir, 0, buf, get_pathname_proc, &gp);
+ if (retval == EXT2_ET_NO_DIRECTORY) {
+ char tmp[32];
+
+ if (ino)
+ snprintf(tmp, sizeof(tmp), "<%u>/<%u>", dir, ino);
+ else
+ snprintf(tmp, sizeof(tmp), "<%u>", dir);
+ retval = ext2fs_get_mem(strlen(tmp)+1, name);
+ if (retval)
+ goto cleanup;
+ strcpy(*name, tmp);
+ return 0;
+ } else if (retval)
+ goto cleanup;
+ if (gp.errcode) {
+ retval = gp.errcode;
+ goto cleanup;
+ }
+
+ retval = ext2fs_get_pathname_int(fs, gp.parent, dir, maxdepth-1,
+ buf, &parent_name);
+ if (retval)
+ goto cleanup;
+ if (!ino) {
+ *name = parent_name;
+ return 0;
+ }
+
+ if (gp.name)
+ retval = ext2fs_get_mem(strlen(parent_name)+strlen(gp.name)+2,
+ &ret);
+ else
+ retval = ext2fs_get_mem(strlen(parent_name)+5, &ret);
+ if (retval)
+ goto cleanup;
+
+ ret[0] = 0;
+ if (parent_name[1])
+ strcat(ret, parent_name);
+ strcat(ret, "/");
+ if (gp.name)
+ strcat(ret, gp.name);
+ else
+ strcat(ret, "???");
+ *name = ret;
+ retval = 0;
+
+cleanup:
+ ext2fs_free_mem(&parent_name);
+ ext2fs_free_mem(&gp.name);
+ return retval;
+}
+
+errcode_t ext2fs_get_pathname(ext2_filsys fs, ext2_ino_t dir, ext2_ino_t ino,
+ char **name)
+{
+ char *buf;
+ errcode_t retval;
+
+ EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
+
+ retval = ext2fs_get_mem(fs->blocksize, &buf);
+ if (retval)
+ return retval;
+ if (dir == ino)
+ ino = 0;
+ retval = ext2fs_get_pathname_int(fs, dir, ino, 32, buf, name);
+ ext2fs_free_mem(&buf);
+ return retval;
+
+}