lookup.c revision 674a4ee1e3e05133ddad701730bfc21c283272a4
119c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o/* 219c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o * lookup.c --- ext2fs directory lookup operations 319c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o * 419c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o * Copyright (C) 1993, 1994, 1994, 1995 Theodore Ts'o. 519c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o * 619c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o * %Begin-Header% 719c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o * This file may be redistributed under the terms of the GNU Public 819c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o * License. 919c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o * %End-Header% 1019c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o */ 1119c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o 1219c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o#include <stdio.h> 1319c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o#include <string.h> 144cbe8af4b0d0c72fb28bb500c1bd8a46b00fdde3Theodore Ts'o#if HAVE_UNISTD_H 1519c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o#include <unistd.h> 164cbe8af4b0d0c72fb28bb500c1bd8a46b00fdde3Theodore Ts'o#endif 1719c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o 18b5abe6fac9c9e7caf4710501d1657d30e4857ef6Theodore Ts'o#if EXT2_FLAT_INCLUDES 19b5abe6fac9c9e7caf4710501d1657d30e4857ef6Theodore Ts'o#include "ext2_fs.h" 20b5abe6fac9c9e7caf4710501d1657d30e4857ef6Theodore Ts'o#else 2119c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o#include <linux/ext2_fs.h> 22b5abe6fac9c9e7caf4710501d1657d30e4857ef6Theodore Ts'o#endif 2319c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o 2419c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o#include "ext2fs.h" 2519c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o 2619c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'ostruct lookup_struct { 2719c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o const char *name; 2819c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o int len; 2919c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o ino_t *inode; 3019c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o int found; 3119c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o}; 3219c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o 333cb6c5021d722e17b7105d1bc090880671f6fc6dTheodore Ts'o#ifdef __TURBOC__ 343cb6c5021d722e17b7105d1bc090880671f6fc6dTheodore Ts'o#pragma argsused 353cb6c5021d722e17b7105d1bc090880671f6fc6dTheodore Ts'o#endif 3619c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'ostatic int lookup_proc(struct ext2_dir_entry *dirent, 3719c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o int offset, 3819c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o int blocksize, 3919c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o char *buf, 40b5abe6fac9c9e7caf4710501d1657d30e4857ef6Theodore Ts'o void *priv_data) 4119c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o{ 42b5abe6fac9c9e7caf4710501d1657d30e4857ef6Theodore Ts'o struct lookup_struct *ls = (struct lookup_struct *) priv_data; 4319c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o 44674a4ee1e3e05133ddad701730bfc21c283272a4Theodore Ts'o if (ls->len != (dirent->name_len & 0xFF)) 4519c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o return 0; 46674a4ee1e3e05133ddad701730bfc21c283272a4Theodore Ts'o if (strncmp(ls->name, dirent->name, (dirent->name_len & 0xFF))) 4719c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o return 0; 4819c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o *ls->inode = dirent->inode; 4919c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o ls->found++; 5019c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o return DIRENT_ABORT; 5119c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o} 5219c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o 5319c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o 5419c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'oerrcode_t ext2fs_lookup(ext2_filsys fs, ino_t dir, const char *name, 5519c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o int namelen, char *buf, ino_t *inode) 5619c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o{ 5719c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o errcode_t retval; 5819c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o struct lookup_struct ls; 5919c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o 6019c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); 6119c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o 6219c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o ls.name = name; 6319c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o ls.len = namelen; 6419c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o ls.inode = inode; 6519c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o ls.found = 0; 6619c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o 6719c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o retval = ext2fs_dir_iterate(fs, dir, 0, buf, lookup_proc, &ls); 6819c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o if (retval) 6919c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o return retval; 7019c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o 711f0b6c1f895d189fea6999d0c07a7fee936a4baaTheodore Ts'o return (ls.found) ? 0 : EXT2_ET_FILE_NOT_FOUND; 7219c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o} 7319c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o 7419c78dc07fce2d6f39b5e541562afc3ca1ea38ffTheodore Ts'o 75