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/*
* 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;
}
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