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/*
* Mach Operating System
* Copyright (c) 1992, 1991 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*
* from: Mach, Revision 2.2 92/04/04 11:36:34 rpd
* $Id: sys.c,v 1.3 1993/10/16 19:11:39 rgrimes Exp $
*/
#include <stdio.h>
#include <string.h>
#include <memory.h>
#define bcopy(a,b,c) memcpy(b,a,c)
#include "protmod.h"
#include "boot.h"
#include "dir.h"
#define BUFSIZE 4096
#undef MAXBSIZE
#define MAXBSIZE 8192
void ufs_read(char *buffer, long count);
static long block_map(long file_block);
char buf[BUFSIZE], fsbuf[SBSIZE], iobuf[MAXBSIZE];
char mapbuf[MAXBSIZE];
long mapblock = 0;
void xread(unsigned long addr, long size)
{
long count = BUFSIZE;
while (size > 0l) {
if (BUFSIZE > size)
count = size;
ufs_read(buf, count);
pm_copy(buf, addr, count);
size -= count;
addr += count;
}
}
void ufs_read(char *buffer, long count)
{
long logno, off, size;
long cnt2, bnum2;
while (count) {
off = blkoff(fs, poff);
logno = lblkno(fs, poff);
cnt2 = size = blksize(fs, &inode, logno);
bnum2 = fsbtodb(fs, block_map(logno)) + boff;
cnt = cnt2;
bnum = bnum2;
if ( (!off) && (size <= count))
{
iodest = buffer;
devread();
}
else
{
iodest = iobuf;
size -= off;
if (size > count)
size = count;
devread();
bcopy(iodest+off,buffer,size);
}
buffer += size;
count -= size;
poff += size;
}
}
static int find(char *path)
{
char *rest, ch;
long block, off, loc, ino = ROOTINO;
struct direct *dp;
loop: iodest = iobuf;
cnt = fs->fs_bsize;
bnum = fsbtodb(fs,itod(fs,ino)) + boff;
devread();
bcopy(&((struct dinode *)iodest)[ino % fs->fs_inopb],
&inode.i_din,
sizeof (struct dinode));
if (!*path)
return 1;
while (*path == '/')
path++;
if (!inode.i_size || ((inode.i_mode&IFMT) != IFDIR))
return 0;
for (rest = path; (ch = *rest) && ch != '/'; rest++) ;
*rest = 0;
loc = 0;
do {
if (loc >= inode.i_size)
return 0;
if (!(off = blkoff(fs, loc))) {
block = lblkno(fs, loc);
cnt = blksize(fs, &inode, block);
bnum = fsbtodb(fs, block_map(block)) + boff;
iodest = iobuf;
devread();
}
dp = (struct direct *)(iodest + off);
loc += dp->d_reclen;
} while (!dp->d_ino || strcmp(path, dp->d_name));
ino = dp->d_ino;
*(path = rest) = ch;
goto loop;
}
static long block_map(long file_block)
{
if (file_block < NDADDR)
return(inode.i_db[file_block]);
if ((bnum=fsbtodb(fs, inode.i_ib[0])+boff) != mapblock) {
iodest = mapbuf;
cnt = fs->fs_bsize;
devread();
mapblock = bnum;
}
return (((long *)mapbuf)[(file_block - NDADDR) % NINDIR(fs)]);
}
int openrd(char *name)
{
char *cp = name;
dosdev = 0x80; /* only 1st HD supported yet */
inode.i_dev = dosdev;
/***********************************************\
* Now we know the disk unit and part, *
* Load disk info, (open the device) *
\***********************************************/
if (devopen()) return 1;
/***********************************************\
* Load Filesystem info (mount the device) *
\***********************************************/
iodest = (char *)(fs = (struct fs *)fsbuf);
cnt = SBSIZE;
bnum = SBLOCK + boff;
devread();
/***********************************************\
* Find the actual FILE on the mounted device *
\***********************************************/
if (!find(cp)) return 1;
poff = 0;
name = cp;
return 0;
}
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