114 lines
2.9 KiB
C
114 lines
2.9 KiB
C
/*
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* linux/fs/msdos/dir.c
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*
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* Written 1992,1993 by Werner Almesberger
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*
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* MS-DOS directory handling functions
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*/
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#include <asm/segment.h>
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#include <linux/fs.h>
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#include <linux/msdos_fs.h>
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#include <linux/errno.h>
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#include <linux/stat.h>
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static int msdos_dir_read(struct inode * inode,struct file * filp, char * buf,int count)
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{
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return -EISDIR;
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}
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static int msdos_readdir(struct inode *inode,struct file *filp,
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struct dirent *dirent,int count);
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static struct file_operations msdos_dir_operations = {
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NULL, /* lseek - default */
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msdos_dir_read, /* read */
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NULL, /* write - bad */
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msdos_readdir, /* readdir */
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NULL, /* select - default */
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NULL, /* ioctl - default */
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NULL, /* mmap */
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NULL, /* no special open code */
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NULL, /* no special release code */
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file_fsync /* fsync */
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};
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struct inode_operations msdos_dir_inode_operations = {
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&msdos_dir_operations, /* default directory file-ops */
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msdos_create, /* create */
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msdos_lookup, /* lookup */
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NULL, /* link */
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msdos_unlink, /* unlink */
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NULL, /* symlink */
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msdos_mkdir, /* mkdir */
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msdos_rmdir, /* rmdir */
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NULL, /* mknod */
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msdos_rename, /* rename */
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NULL, /* readlink */
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NULL, /* follow_link */
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msdos_bmap, /* bmap */
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NULL, /* truncate */
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NULL /* permission */
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};
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static int msdos_readdir(struct inode *inode,struct file *filp,
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struct dirent *dirent,int count)
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{
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int ino,i,i2,last;
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char c,*walk;
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struct buffer_head *bh;
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struct msdos_dir_entry *de;
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if (!inode || !S_ISDIR(inode->i_mode)) return -EBADF;
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if (inode->i_ino == MSDOS_ROOT_INO) {
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/* Fake . and .. for the root directory. */
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if (filp->f_pos == 2) filp->f_pos = 0;
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else if (filp->f_pos < 2) {
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walk = filp->f_pos++ ? ".." : ".";
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for (i = 0; *walk; walk++)
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put_fs_byte(*walk,dirent->d_name+i++);
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put_fs_long(MSDOS_ROOT_INO,&dirent->d_ino);
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put_fs_byte(0,dirent->d_name+i);
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put_fs_word(i,&dirent->d_reclen);
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return i;
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}
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}
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if (filp->f_pos & (sizeof(struct msdos_dir_entry)-1)) return -ENOENT;
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bh = NULL;
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while ((ino = msdos_get_entry(inode,&filp->f_pos,&bh,&de)) > -1) {
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if (!IS_FREE(de->name) && !(de->attr & ATTR_VOLUME)) {
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for (i = last = 0; i < 8; i++) {
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if (!(c = de->name[i])) break;
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if (c >= 'A' && c <= 'Z') c += 32;
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if (c != ' ') last = i+1;
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put_fs_byte(c,i+dirent->d_name);
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}
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i = last;
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put_fs_byte('.',i+dirent->d_name);
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i++;
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for (i2 = 0; i2 < 3; i2++) {
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if (!(c = de->ext[i2])) break;
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if (c >= 'A' && c <= 'Z') c += 32;
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if (c != ' ') last = i+1;
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put_fs_byte(c,i+dirent->d_name);
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i++;
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}
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if ((i = last) != 0) {
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if (!strcmp(de->name,MSDOS_DOT))
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ino = inode->i_ino;
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else if (!strcmp(de->name,MSDOS_DOTDOT))
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ino = msdos_parent_ino(inode,0);
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put_fs_long(ino,&dirent->d_ino);
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put_fs_byte(0,i+dirent->d_name);
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put_fs_word(i,&dirent->d_reclen);
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brelse(bh);
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return i;
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}
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}
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}
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if (bh) brelse(bh);
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return 0;
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}
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