mirror of https://github.com/vitalif/e2fsprogs
156 lines
3.1 KiB
C
156 lines
3.1 KiB
C
/*
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* get_pathname.c --- do directry/inode -> name translation
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*
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* Copyright (C) 1993, 1994, 1995 Theodore Ts'o.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Public
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* License.
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* %End-Header%
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*
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* ext2fs_get_pathname(fs, dir, ino, name)
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*
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* This function translates takes two inode numbers into a
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* string, placing the result in <name>. <dir> is the containing
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* directory inode, and <ino> is the inode number itself. If
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* <ino> is zero, then ext2fs_get_pathname will return pathname
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* of the the directory <dir>.
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#if HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#include <linux/ext2_fs.h>
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#include "ext2fs.h"
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struct get_pathname_struct {
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int search_ino;
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int parent;
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char *name;
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errcode_t errcode;
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};
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static int get_pathname_proc(struct ext2_dir_entry *dirent,
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int offset,
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int blocksize,
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char *buf,
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void *private)
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{
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struct get_pathname_struct *gp;
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gp = (struct get_pathname_struct *) private;
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if ((dirent->name_len == 2) &&
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!strncmp(dirent->name, "..", 2))
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gp->parent = dirent->inode;
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if (dirent->inode == gp->search_ino) {
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gp->name = malloc(dirent->name_len + 1);
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if (!gp->name) {
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gp->errcode = ENOMEM;
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return DIRENT_ABORT;
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}
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strncpy(gp->name, dirent->name, dirent->name_len);
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gp->name[dirent->name_len] = '\0';
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return DIRENT_ABORT;
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}
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return 0;
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}
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static errcode_t ext2fs_get_pathname_int(ext2_filsys fs, ino_t dir, ino_t ino,
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int maxdepth, char *buf, char **name)
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{
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struct get_pathname_struct gp;
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char *parent_name, *ret;
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errcode_t retval;
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if (dir == ino) {
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*name = malloc(2);
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if (!*name)
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return ENOMEM;
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strcpy(*name, (dir == EXT2_ROOT_INO) ? "/" : ".");
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return 0;
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}
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if (!dir || (maxdepth < 0)) {
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*name = malloc(4);
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if (!*name)
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return ENOMEM;
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strcpy(*name, "...");
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return 0;
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}
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gp.search_ino = ino;
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gp.parent = 0;
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gp.name = 0;
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gp.errcode = 0;
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retval = ext2fs_dir_iterate(fs, dir, 0, buf, get_pathname_proc, &gp);
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if (retval)
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goto cleanup;
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if (gp.errcode) {
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retval = gp.errcode;
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goto cleanup;
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}
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retval = ext2fs_get_pathname_int(fs, gp.parent, dir, maxdepth-1,
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buf, &parent_name);
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if (retval)
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goto cleanup;
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if (!ino) {
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*name = parent_name;
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return 0;
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}
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if (gp.name)
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ret = malloc(strlen(parent_name)+strlen(gp.name)+2);
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else
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ret = malloc(strlen(parent_name)+5); /* strlen("???") + 2 */
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if (!ret) {
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retval = ENOMEM;
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goto cleanup;
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}
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ret[0] = 0;
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if (parent_name[1])
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strcat(ret, parent_name);
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strcat(ret, "/");
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if (gp.name)
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strcat(ret, gp.name);
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else
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strcat(ret, "???");
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*name = ret;
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free(parent_name);
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retval = 0;
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cleanup:
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if (gp.name)
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free(gp.name);
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return retval;
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}
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errcode_t ext2fs_get_pathname(ext2_filsys fs, ino_t dir, ino_t ino,
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char **name)
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{
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char *buf;
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errcode_t retval;
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EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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buf = malloc(fs->blocksize);
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if (!buf)
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return ENOMEM;
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if (dir == ino)
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ino = 0;
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retval = ext2fs_get_pathname_int(fs, dir, ino, 32, buf, name);
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free(buf);
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return retval;
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}
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