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