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- /*
- * get_pathname.c --- do directry/inode -> name translation
- *
- * Copyright (C) 1993 Theodore Ts'o. This file may be redistributed
- * under the terms of the GNU Public License.
- */
-
- #include <stdio.h>
- #include <string.h>
- #include <unistd.h>
- #include <stdlib.h>
-
- #include <errno.h>
- #include <linux/ext2_fs.h>
-
- #include "ext2fs.h"
-
- struct get_pathname_struct {
- int search_ino;
- int parent;
- char *name;
- errcode_t errcode;
- };
-
- static int get_pathname_proc(struct ext2_dir_entry *dirent,
- int offset,
- int blocksize,
- char *buf,
- void *private)
- {
- struct get_pathname_struct *gp;
-
- gp = (struct get_pathname_struct *) private;
-
- if ((dirent->name_len == 2) &&
- !strncmp(dirent->name, "..", 2))
- gp->parent = dirent->inode;
- if (dirent->inode == gp->search_ino) {
- gp->name = malloc(dirent->name_len + 1);
- if (!gp->name) {
- gp->errcode = ENOMEM;
- return DIRENT_ABORT;
- }
- strncpy(gp->name, dirent->name, dirent->name_len);
- gp->name[dirent->name_len] = '\0';
- return DIRENT_ABORT;
- }
- return 0;
- }
-
- static errcode_t ext2fs_get_pathname_int(ext2_filsys fs, ino_t dir, ino_t ino,
- int maxdepth, char *buf, char **name)
- {
- struct get_pathname_struct gp;
- char *parent_name, *ret;
- errcode_t retval;
-
- if (dir == ino) {
- *name = malloc(2);
- if (!*name)
- return ENOMEM;
- strcpy(*name, (dir == EXT2_ROOT_INO) ? "/" : ".");
- return 0;
- }
-
- if (!dir || (maxdepth < 0)) {
- *name = malloc(4);
- if (!*name)
- return ENOMEM;
- 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)
- 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;
- }
-
- ret = malloc(strlen(parent_name)+strlen(gp.name)+2);
- if (!ret) {
- retval = ENOMEM;
- 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;
- free(parent_name);
- retval = 0;
-
- cleanup:
- if (gp.name)
- free(gp.name);
- return retval;
- }
-
- errcode_t ext2fs_get_pathname(ext2_filsys fs, ino_t dir, ino_t ino,
- char **name)
- {
- char *buf;
- errcode_t retval;
-
- EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
-
- buf = malloc(fs->blocksize);
- if (!buf)
- return ENOMEM;
- if (dir == ino)
- ino = 0;
- retval = ext2fs_get_pathname_int(fs, dir, ino, 32, buf, name);
- free(buf);
- return retval;
-
- }
-