dos33fsprogs/dos33fs-linux2.4/misc.c

85 lines
2.6 KiB
C
Raw Normal View History

/*****************************************************************************
* misc.c
* Miscellaneous utility and helper functions.
*
* Apple II DOS 3.3 Filesystem Driver for Linux 2.4.x
* Copyright (c) 2001 Vince Weaver
* Copyright (c) 2001 Matt Jensen.
* This program is free software distributed under the terms of the GPL.
*****************************************************************************/
/*= Kernel Includes =========================================================*/
#include <linux/blkdev.h>
/*= DOS 3.3 Includes =========================================================*/
#include "dos33.h"
extern int dos33_convert_filename(char *filename) {
int i,last_char=0;
for(i=0;i<DOS33_MAX_NAME_LEN;i++) {
filename[i]&=0x7f; /* strip high bit */
if (filename[i]!=0x20) last_char=i;
}
filename[last_char+1]=0;
// printk("%i : \"%s\"\n",last_char,filename);
return last_char+1;
}
/*****************************************************************************
* dos33_check_name()
* Check a name for validity under DOS 3.3 naming rules.
* namely, first character must be > 63
* no commas or colors allowed. Everything else goes
*****************************************************************************/
int dos33_check_name(struct qstr *qstr) {
int len = qstr->len;
int i;
/* Check only up to ProDOS name length limit. */
if (len>DOS33_MAX_NAME_LEN) len=DOS33_MAX_NAME_LEN;
if (qstr->name[0]<64) return -EINVAL;
for(i=0;i<len;i++) {
if ((qstr->name[i]==',') || (qstr->name[i]==':')) return -EINVAL;
}
return 0;
}
/*****************************************************************************
* dos33_bread()
* Read a block from a device.
* do some magic for the 256byte->512byte transition
*****************************************************************************/
struct buffer_head *dos33_bread(struct super_block *sb,int block_num) {
int internal_block_num=block_num/2;
SHORTCUT struct dos33_sb_info * const psb = DOS33_SB(sb);
if (internal_block_num < 0 || internal_block_num >= psb->s_part_size) {
return NULL;
}
DOS33_DEBUG("Attempting to read block 0x%x %i\n",internal_block_num,
psb->s_part_start+internal_block_num);
return bread(sb->s_dev,psb->s_part_start + internal_block_num,DOS33_BLOCK_SIZE);
}
/*****************************************************************************
* dos33_brelse()
* Release a block that was previously read via dos33_bread().
*****************************************************************************/
void dos33_brelse(struct buffer_head *bh) {
brelse(bh);
}