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158 lines
3.3 KiB
C
158 lines
3.3 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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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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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include "ext2_fs.h"
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#include "ext2fs.h"
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struct get_pathname_struct {
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ext2_ino_t search_ino;
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ext2_ino_t parent;
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char *name;
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errcode_t errcode;
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};
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#ifdef __TURBOC__
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# pragma argsused
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#endif
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static int get_pathname_proc(struct ext2_dir_entry *dirent,
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int offset EXT2FS_ATTR((unused)),
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int blocksize EXT2FS_ATTR((unused)),
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char *buf EXT2FS_ATTR((unused)),
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void *priv_data)
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{
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struct get_pathname_struct *gp;
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errcode_t retval;
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gp = (struct get_pathname_struct *) priv_data;
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if (((dirent->name_len & 0xFF) == 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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retval = ext2fs_get_mem((dirent->name_len & 0xFF) + 1,
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&gp->name);
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if (retval) {
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gp->errcode = retval;
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return DIRENT_ABORT;
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}
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strncpy(gp->name, dirent->name, (dirent->name_len & 0xFF));
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gp->name[dirent->name_len & 0xFF] = '\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, ext2_ino_t dir,
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ext2_ino_t ino, int maxdepth,
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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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retval = ext2fs_get_mem(2, name);
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if (retval)
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return retval;
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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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retval = ext2fs_get_mem(4, name);
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if (retval)
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return retval;
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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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retval = ext2fs_get_mem(strlen(parent_name)+strlen(gp.name)+2,
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&ret);
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else
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retval = ext2fs_get_mem(strlen(parent_name)+5, &ret);
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if (retval)
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goto cleanup;
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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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ext2fs_free_mem(&parent_name);
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retval = 0;
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cleanup:
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ext2fs_free_mem(&gp.name);
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return retval;
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}
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errcode_t ext2fs_get_pathname(ext2_filsys fs, ext2_ino_t dir, ext2_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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retval = ext2fs_get_mem(fs->blocksize, &buf);
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if (retval)
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return retval;
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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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ext2fs_free_mem(&buf);
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return retval;
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}
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