Ultrix-3.1/src/cmd/fsdb.c
/**********************************************************************
* Copyright (c) Digital Equipment Corporation 1984, 1985, 1986. *
* All Rights Reserved. *
* Reference "/usr/src/COPYRIGHT" for applicable restrictions. *
**********************************************************************/
static char Sccsid[] = "@(#)fsdb.c 3.0 4/21/86";
/*
* fsdb - file system debugger
*/
/*
* Changes for ULTRIX-11:
* added definitions for 'loword & lobyte' (in param.h for sysIII)
* comment out usage of FIFO type file: Bill Burns 3/15/82
*
* Put back FIFO, George Mathew 6/25/85
*/
#include <sys/param.h>
#include <sys/inode.h>
#include <sys/ino.h>
#include <stdio.h>
#include <setjmp.h>
#define NBUF 3
#define MODE 0
#define LINK 2
#define UID 4
#define GID 6
#define SZ (BSIZE/64)
#define ADRMSK (BSIZE -1)
#define A0 12
#define MIN_OFF 12
#define MAJ_OFF 13
#define AT 52
#define MT 56
#define CT 60
#define NUMB 10
#define INODE 11
#define BLOCK 12
#define DIR 13
#define HIBIT 0100000
/* following defines are from System III, <param.h> */
#define lobyte(X) (((char *)&X)[0])
#define hibyte(X) (((char *)&X)[1])
#define loword(X) (((ushort *)&X)[1])
#define hiword(X) (((ushort *)&X)[0])
#ifdef vax
#define SLOC 01004
#else
#ifdef UCB_NKB
#define SLOC 02002
#else
#define SLOC 01002
#endif UCB_NKB
#endif
struct buf {
struct buf *fwd;
struct buf *back;
char *blkaddr;
short valid;
long blkno;
} buf[NBUF], bhdr;
char buffers[NBUF][BSIZE];
struct dir {
short inumb;
char nm[DIRSIZ];
} *dirp;
struct dinode *ip;
long addr, value, temp, oldaddr, oldvalue, erraddr;
#ifdef UCB_NKB
long cur_ino = 04000;
#else
long cur_ino = 02000;
#endif
short objsz = 2;
short fd, c_count, i, j, k, oldobjsz, error, type;
short count, pid, rpid, retcode, mode, char_flag, prt_flag;
unsigned isize;
long fsize;
char *p,
*getblk();
short override = 1;
jmp_buf env;
/*
* main - continuously looping input scanner. Lines are scanned
* a character at a time and are processed as soon as
* sufficient information has been collected. When an error
* is detected, the remainder of the line is flushed.
*/
main(argc,argv)
short argc;
char **argv;
{
register char *cptr;
register char c;
register short *iptr;
#ifdef STANDALONE
char devnam[9];
int maj,min;
long blk;
#endif
extern long get();
extern long bmap();
extern long getnumb();
extern err();
register struct buf *bp;
unsigned block;
short offset;
/* printf("version 3.0 - 4/21/86 %lu%\n\n");*/
setbuf(stdin,NULL);
if(argc!=2 && argc!=3) {
printf("usage: fsdb /dev/rp??\n");
exit(1);
}
#ifdef vax
printf("\nVAX asembly\n");
#else
#ifdef pdp11
printf("\nULTRIX-11 assembly\n");
#endif
#endif
if((fd = open(argv[1],2)) < 0) {
#ifdef STANDALONE
cptr = argv[1];
for(maj = 0; maj <9; devnam[maj++] = *cptr++);
if(devnam[8] == '\0'){
maj = 0;
min = devnam[7] - '0';
}
else {
maj = devnam[7];
min = devnam[8];
}
if(maj <0 | maj > 3 | min < 0 | min > 5){
printf("invalid device name - %s\n",devnam);
exit(1);
}
if(min == 0) blk = 0l;
else blk = 1392l + ((long)(min-1) * 65626l);
printf("trying to make node %s %d %d %ld\n",devnam,maj,min,blk);
if(MKNOD(devnam,maj,min,blk) < 0){
printf("cannot create %s \n",devnam);
exit(1);
}
if((fd = open(devnam,2)) < 0){
printf("cannot open %s\n",argv[1]);
exit(1);
}
}
#else
printf("cannot open %s\n",argv[1]);
exit(1);
}
#endif
bhdr.fwd = bhdr.back = &bhdr;
for(i=0; i<NBUF; i++) {
bp = &buf[i];
bp->blkaddr = buffers[i];
bp->valid = 0;
insert(bp);
}
reload();
if(argc == 3) printf("error checking off\n");
else override = 0;
#ifndef STANDALONE
signal(2,err);
setjmp(env);
#endif
for(;;) {
if(error) {
if(c != '\n') while (getc(stdin) != '\n');
c_count = 0;
prt_flag = 0;
char_flag = 0;
error = 0;
addr = erraddr;
printf("?\n");
/* type = -1; allows "d31 + +" to work */
}
c_count++;
switch(c = getc(stdin)) {
case '\n': /* command end */
erraddr = addr;
if(c_count == 1) addr = addr + objsz;
c_count = 0;
if(prt_flag) {
prt_flag = 0;
continue;
}
temp = get(objsz);
/* if an error has been flagged, it is probably
* due to allignment. This will have set objsz
* to 1 hence the next get should work.
*/
if(error) temp = get(objsz);
switch(objsz) {
case 1: cptr = ".B"; break;
case 2: cptr = ""; break;
case 3: cptr = ".A"; break;
case 4: cptr = ".D"; break;
case DIRSIZ:
case 16:
if(bcomp(addr,erraddr)) continue;
fprnt('d', 1);
prt_flag = 0;
continue;
case 64: fprnt('i',1);
cur_ino = addr;
prt_flag = 0;
continue;
}
printf("%6.6lo%s: %6.6lo (%ld)\n",addr,cptr,temp,temp);
continue;
default: /* catch absolute addresses, b and i#'s */
if(c<='9' && c>='0') {
ungetc(c,stdin);
addr = getnumb();
objsz = 2;
value = addr;
type = NUMB;
continue;
}
if(feof(stdin)) exit(0);
error++;
continue;
case 'i': /* i# to inode conversion */
if(c_count == 1) {
addr = cur_ino;
value = get(64);
type = INODE;
continue;
}
if(type==NUMB)value = addr;
#ifdef UCB_NKB
addr = ((value - 1) << 6) + 2*BSIZE;
#else
addr = ((value - 1) << 6) + 1024;
#endif
if(icheck(addr)) continue;
cur_ino = addr;
value = get(64);
type = INODE;
continue;
case 'b': /* block conversion */
if(type == NUMB)value = addr;
addr = value << BSHIFT;
value = get(2);
type = BLOCK;
continue;
case 'd': /* directory offsets */
value = getnumb();
if(error||(value > 31)) {
error++;
continue;
}
if(value != 0) if(dircheck()) continue;
addr = (addr & ~ADRMSK) + (value << 4);
value = get(16); /* i-number */
type = DIR;
continue;
case '\t':
case ' ':
case '.': continue;
case '+': /* address addition */
c = getc(stdin);
ungetc(c,stdin);
if(c > '9' || c < '0') temp = objsz;
else temp = getnumb() * objsz;
if(error) continue;
if(objsz == DIRSIZ || objsz == 16)
if(bcomp(addr,addr+temp)) {
c = '+';
continue;
}
addr = addr + temp;
value = get(objsz);
continue;
case '-': /* address subtraction */
c = getc(stdin);
ungetc(c,stdin);
if(c > '9' || c < '0') temp = objsz;
else temp = getnumb() * objsz;
if(error) continue;
if(objsz == DIRSIZ || objsz == 16)
if(bcomp(addr,addr-temp)) {
c = '-';
continue;
}
addr = addr - temp;
value = get(objsz);
continue;
case '*': temp = getnumb();
if(error) continue;
addr = addr * temp;
value = get(objsz);
continue;
case '/': temp = getnumb();
if(error) continue;
addr = addr / temp;
value = get(objsz);
continue;
case 'q': /* quit */
if(c_count != 1 || (c = getc(stdin)) != '\n') {
error++;
continue;
}
exit(0);
case '>': /* save current address */
oldaddr = addr;
oldvalue = value;
oldobjsz = objsz;
continue;
case '<': /* restore saved address */
addr = oldaddr;
value = oldvalue;
objsz = oldobjsz;
continue;
case 'a': /* access time */
if((c = getc(stdin)) == 't') {
addr = cur_ino + AT;
type = AT;
value = get(4);
continue;
}
/* data block addresses */
ungetc(c,stdin);
value = getnumb();
if(error||(value > 12)) {
error++;
continue;
}
addr = cur_ino + A0 + (value * 3);
value = get(3);
type = A0;
continue;
case 'm': /* mt, md, maj, min */
addr = cur_ino;
mode = get(2);
if(error) continue;
switch(c = getc(stdin)) {
case 't': /* modification time */
addr = addr + MT;
type = MT;
value = get(4);
continue;
case 'd': /* mode */
addr = addr + MODE;
type = MODE;
value = get(2);
continue;
case 'a': /* major device number */
if((c = getc(stdin)) != 'j') {
error++;
continue;
}
if(devcheck(mode)) continue;
addr = addr + MAJ_OFF;
value = get(1);
type = MAJ_OFF;
continue;
case 'i': /* minor device number */
if((c = getc(stdin)) != 'n') {
error++;
continue;
}
if(devcheck(mode)) continue;
addr = addr + MIN_OFF;
value = get(1);
type = MIN_OFF;
continue;
}
error++;
continue;
case 's': /* file size */
type = SZ;
continue;
case 'l': /* link count */
if((c = getc(stdin)) != 'n') {
error++;
continue;
}
addr = cur_ino + LINK;
value = get(2);
type = LINK;
continue;
case 'g': /* group id */
if((c=getc(stdin))!= 'i' || (c=getc(stdin)) != 'd') {
error++;
continue;
}
addr = cur_ino + GID;
value = get(2);
type = GID;
continue;
case 'u': /* user id */
if((c=getc(stdin))!= 'i' || (c=getc(stdin)) != 'd') {
error++;
continue;
}
addr = cur_ino + UID;
value = get(1);
type = UID;
continue;
case 'n': /* directory name */
if((c = getc(stdin)) != 'm') {
error++;
continue;
}
if(dircheck()) continue;
type = DIRSIZ;
objsz = DIRSIZ;
addr = (addr & ~017) + 2;
continue;
case '=': /* assignment operation */
switch(c = getc(stdin)) {
case '"': /* character string */
puta();
continue;
case '+': /* =+ operator */
temp = getnumb();
value = get(objsz);
if(!error) put(value+temp,objsz);
continue;
case '-': /* =- operator */
temp = getnumb();
value = get(objsz);
if(!error) put(value-temp,objsz);
continue;
default: /* nm and regular assignment */
ungetc(c,stdin);
if((type == DIRSIZ) && (c > '9' || c < '0')) {
puta();
continue;
}
value = getnumb();
if(!error) put(value,objsz);
continue;
}
case '!': /* shell command */
#ifdef STANDALONE
printf("Shell not available stand-alone");
continue;
#else
if(c_count != 1) {
error++;
continue;
}
if((pid = fork()) == 0) {
execl("/bin/sh", "sh", "-t", 0);
error++;
continue;
}
while((rpid = wait(&retcode)) != pid && rpid != -1);
printf("!\n");
c_count = 0;
continue;
#endif
case 'F': /* buffer status */
for(bp=bhdr.fwd; bp!= &bhdr; bp=bp->fwd)
printf("%6lu %d\n",bp->blkno,bp->valid);
continue;
case 'f': /* file print facility */
if((c=getc(stdin)) >= '0' && c <= '9') {
ungetc(c,stdin);
temp = getnumb();
if (error) continue;
c = getc(stdin);
}
else temp = 0;
count = 0;
addr = cur_ino;
mode = get(2);
if(!override) {
if((mode & IFMT)==0)
printf("warning: inode not allocated\n");
}
if(mode & IFCHR) {
printf("special device\n");
error++;
continue;
}
if((addr = (bmap(temp)) << BSHIFT) == 0)
continue;
fprnt(c,0);
continue;
case 'O': /* override flip flop */
if(override = !override)
printf("error checking off\n");
else {
printf("error checking on\n");
reload();
}
prt_flag++;
continue;
case 'B': /* byte offsets */
objsz = 1;
continue;
case 'W': /* word offsets */
objsz = 2;
addr = addr & ~01;
continue;
case 'D': /* double word offsets */
objsz = 4;
addr = addr & ~01;
continue;
case 'A': abort();
case ',': /* general print facilities */
case 'p':
if(( c = getc(stdin)) >= '0' && c <= '9') {
ungetc(c,stdin);
count = getnumb();
if(error) continue;
if((count < 0) || (count > BSIZE))
count = 1;
c = getc(stdin);
}
else if(c == '*'){
count = 0; /* print to end of block */
c = getc(stdin);
}
else count = 1;
fprnt(c,count);
}
}
}
/*
* getnumb - read a number from the input stream. A leading
* zero signifies octal interpretation. If the first character
* is not numeric this is an error, otherwise continue
* until the first non-numeric.
*/
long
getnumb()
{
extern short error;
long number, base;
register char c;
if(((c = getc(stdin)) < '0')||(c > '9')) {
error++;
ungetc(c,stdin);
return(-1);
}
if(c == '0') base = 8;
else base = 10;
number = c - '0';
while(((c = getc(stdin)) >= '0' )&&( c <= '9')) {
if((base == 8) && ((c =='8')||(c == '9'))) {
error++;
return(-1);
}
number = number * base + c - '0';
}
ungetc(c,stdin);
return(number);
}
/*
* get - read a byte, word or double word from the file system.
* The entire block containing the desired item is read
* and the appropriate data is extracted and returned.
* Inode and directory size requests result in word
* fetches. Directory names (objsz == DIRSIZ) result in byte
* fetches.
*/
long
get(lngth)
short lngth;
{
long vtemp;
char *bptr;
char *vptr;
short offset;
objsz = lngth;
if(allign(objsz)) return(-1);
if((bptr = getblk(addr)) == 0) return(-1);
vtemp = 0;
offset = addr & ADRMSK;
bptr = bptr + offset;
if(offset + lngth > BSIZE) {
error++;
printf ("get(lngth) - %d too long\n",offset + lngth);
return(-1);
}
switch(objsz) {
case 4: vtemp = *(long *)bptr;
return(vtemp);
case 64:
case 16:
case 2: loword(vtemp) = *(short *)bptr;
return(vtemp);
case DIRSIZ:
case 1: lobyte(loword(vtemp)) = *bptr;
return(vtemp);
case 3:
l3tol(&vtemp,bptr,1);
return(vtemp);
}
error++;
printf ("get(%d) - invalid length\n",lngth);
return(0);
}
/*
* icheck - check if the current address is within the I-list.
* The I-list extends for isize blocks beginning at the
* super block + 1, i.e., from block 2 to block isize.
*/
icheck(address)
long address;
{
unsigned blk;
if(override) return(0);
blk = address >> BSHIFT;
if((blk >= 2) && (blk < isize))
return(0);
printf("inode out of range\n");
error++;
return(1);
}
/*
* putf - print a byte as an ascii character if possible.
* The exceptions are tabs, newlines, backslashes
* and nulls which are printed as the standard c
* language escapes. Characters which are not
* recognized are printed as \?.
*/
putf(c)
register char c;
{
if(c<=037 || c>=0177 || c=='\\') {
putc('\\',stdout);
switch(c) {
case '\\': putc('\\',stdout);
break;
case '\t': putc('t',stdout);
break;
case '\n': putc('n',stdout);
break;
case '\0': putc('0',stdout);
break;
default: putc('?',stdout);
}
}
else {
putc(' ',stdout);
putc(c,stdout);
}
putc(' ',stdout);
}
/*
* put - write an item into the buffer for the current address
* block. The value is checked to make sure that it will
* fit in the size given without truncation. If successful,
* the entire block is written back to the file system.
*/
put(item,lngth)
long item;
short lngth;
{
register char *bptr, *sbptr, *vptr;
short offset;
long s_err,nbytes;
objsz = lngth;
if(allign(objsz)) return(-1);
if((sbptr = getblk(addr)) == 0) return;
offset = addr & ADRMSK;
if(offset + lngth > BSIZE) {
error++;
printf("block overflow\n");
return;
}
bptr = sbptr + offset;
switch(objsz) {
case 3: vptr = ((char *)&item);
if(vptr[1] != 0) break;
ltol3(bptr,vptr,1);
goto rite;
case 4: *bptr = item;
goto rite;
case 64:
case 16:
case 2: if(item & ~0177777L) break;
*(short *)bptr = item;
goto rite;
case DIRSIZ:
case 1: if(item & ~0377) break;
*bptr = lobyte(loword(item));
rite: if((s_err = lseek(fd,addr & ~(long)ADRMSK,0)) == -1) {
error++;
printf("seek error : %lo\n",addr);
return(0);
}
if((nbytes = write(fd,sbptr,BSIZE)) != BSIZE) {
error++;
printf("write error : addr = %lo\n",addr);
printf(" : s_err = %lo\n",s_err);
printf(" : nbytes = %lo\n",nbytes);
return(0);
}
return;
default: error++;
return;
}
printf("truncation error\n");
error++;
}
/*
* getblk - check if the desired block is in the file system.
* Search the incore buffers to see if the block is already
* available. If successful, unlink the buffer control block
* from its position in the buffer list and re-insert it at
* the head of the list. If failure, use the last buffer
* in the list for the desired block. Again, this control
* block is placed at the head of the list. This process
* will leave commonly requested blocks in the in-core buffers.
* Finally, a pointer to the buffer is returned.
*/
char *getblk(address)
long address;
{
register struct buf *bp;
long block;
long s_err,nbytes;
block = addr >> BSHIFT;
if(!override)
if(block >= fsize) {
printf("block out of range\n");
error++;
return(0);
}
for(bp=bhdr.fwd; bp!= &bhdr; bp=bp->fwd)
if(bp->blkno==block && bp->valid) goto xit;
bp = bhdr.back;
bp->blkno = block;
bp->valid = 0;
if((s_err = lseek(fd,addr & ~(long)ADRMSK,0)) == -1) {
error++;
printf("seek error : %lo\n",addr);
return(0);
}
if((nbytes = read(fd,bp->blkaddr,BSIZE)) != BSIZE) {
error++;
printf("read error : addr = %lo\n",addr);
printf(" : s_err = %lo\n",s_err);
printf(" : nbytes = %lo\n",nbytes);
return(0);
}
bp->valid++;
xit: bp->back->fwd = bp->fwd;
bp->fwd->back = bp->back;
insert(bp);
return(bp->blkaddr);
}
/*
* insert - place the designated buffer control block
* at the head of the linked list of buffers.
*/
insert(bp)
register struct buf *bp;
{
bp->back = &bhdr;
bp->fwd = bhdr.fwd;
bhdr.fwd->back = bp;
bhdr.fwd = bp;
}
/*
* allign - before a get or put operation check the
* current address for a boundary corresponding to the
* size of the object.
*/
allign(ment)
short ment;
{
switch(ment) {
case 4: if(addr & 01L) break;
return(0);
case DIRSIZ: if((addr & 017) != 02) break;
return(0);
case 16:
case 64:
case 2: if(addr & 01L) break;
case 3:
case 1: return(0);
}
error++;
objsz = 1;
printf("allignment\n");
return(1);
}
/*
* err - called on interrupts. Set the current address
* back to the last address stored in erraddr. Reset all
* appropriate flags. If the prt_flag is set, the interrupt
* occured while transferring characters to a buffer.
* These are "erased" by invalidating the buffer, causing
* the entire block to be re-read upon the next reference.
* A reset call is made to return to the main loop;
*/
err()
{
#ifndef STANDALONE
signal(2,err);
addr = erraddr;
error = 0;
c_count = 0;
if(char_flag) {
bhdr.fwd->valid = 0;
char_flag = 0;
}
prt_flag = 0;
printf("\n?\n");
fseek(stdin, 0L, 2);
longjmp(env,0);
#endif
}
/*
* devcheck - check that the given mode represents a
* special device. The IFCHR bit is on for both
* character and block devices.
*/
devcheck(md)
register short md;
{
if(override) return(0);
if(md & IFCHR) return(0);
printf("not char or block device\n");
error++;
return(1);
}
/*
* nullblk - return error if address is zero. This is done
* to prevent block 0 from being used as an indirect block
* for a large file or as a data block for a small file.
*/
nullblk(bn)
long bn;
{
if(bn != 0) return(0);
printf("non existent block\n");
error++;
return(1);
}
/*
* dircheck - check if the current address can be in a directory.
* This means it is not in the I-list, block 0 or the super block.
*/
dircheck()
{
unsigned block;
if(override) return (0);
if((block = (addr >> BSHIFT)) >= isize) return(0);
error++;
printf("block in I-list\n");
return(1);
}
/*
* puta - put ascii characters into a buffer. The string
* terminates with a quote or newline. The leading quote,
* which is optional for directory names, was stripped off
* by the assignment case in the main loop. If the type
* indicates a directory name, the entry is null padded to
* DIRSIZ bytes. If more than 14 characters have been given
* with this type or, in any case, if a block overflow
* occurs, the current block is made invalid. See the
* description for err.
*/
puta()
{
register char *bptr, c;
register offset;
char *sbptr;
unsigned block;
long s_err,nbytes;
if((sbptr = getblk(addr)) == 0) return;
char_flag++;
offset = addr & ADRMSK;
bptr = sbptr + offset;
while((c = getc(stdin)) != '"') {
if(offset++ == BSIZE) {
bhdr.fwd->valid = 0;
error++;
char_flag = 0;
printf("block overflow\n");
return;
}
if(c == '\n') {
ungetc(c,stdin);
break;
}
if(c == '\\') {
switch(c = getc(stdin)) {
case 't': *bptr++ = '\t'; break;
case 'n': *bptr++ = '\n'; break;
case '0': *bptr++ = '\0'; break;
default: *bptr++ = c; break;
}
}
else *bptr++ = c;
}
char_flag = 0;
if(type == DIRSIZ) {
c = offset - (addr & ADRMSK);
if(c > DIRSIZ) {
bhdr.fwd->valid = 0;
error++;
char_flag = 0;
printf("name too long\n");
return;
}
while(c++ < DIRSIZ) *bptr++ = '\0';
}
if((s_err = lseek(fd,addr & ~(long)ADRMSK,0)) == -1) {
error++;
printf("seek error : %lo\n",addr);
return(0);
}
if((nbytes = write(fd,sbptr,BSIZE)) != BSIZE) {
error++;
printf("write error : addr = %lo\n",addr);
printf(" : s_err = %lo\n",s_err);
printf(" : nbytes = %lo\n",nbytes);
return(0);
}
}
/*
* fprnt - print data as characters, octal or decimal words, octal
* bytes, directories or inodes A total of "count" entries
* are printed. A zero count will print all entries to the
* end of the current block. If the printing would cross a
* block boundary, the attempt is aborted and an error returned.
* This is done since logically sequential blocks are generally
* not physically sequential. The error address is set
* after each entry is printed. Upon completion, the current
* address is set to that of the last entry printed.
*/
fprnt(style,count)
register char style;
register short count;
{
short offset;
unsigned block;
char *cptr;
short *iptr;
short *tptr;
long tmp;
prt_flag++;
block = addr >> BSHIFT;
offset = addr & ADRMSK;
if((cptr = getblk(addr)) == 0){
ip = 0;
iptr = 0;
dirp = 0;
return;
}
ip = ((struct dinode *)cptr);
erraddr = addr;
switch (style) {
case 'c': /* print as characters */
case 'b': /* or octal bytes */
if(count == 0) count = BSIZE - offset;
if(offset + count > BSIZE) break;
objsz = 1;
cptr = cptr + offset;
for(i=0; count--; i++) {
if(i % 16 == 0)
printf("\n%6.6lo: ",addr);
if(style == 'c') putf(*cptr++);
else printf("%4.4o",*cptr++ & 0377);
erraddr = addr;
addr++;
}
addr--;
putc('\n',stdout);
return;
case 'd': /* print as directories */
if(dircheck()) return;
addr = addr & ~017;
offset = offset >> 4;
#ifdef UCB_NKB
if(count == 0) count = (BSIZE/16) - offset;
if(count + offset > (BSIZE/16)) break;
#else
if(count == 0) count = 32 - offset;
if(count + offset > 32) break;
#endif
type = DIR;
objsz = 16;
for(dirp = ((struct dir *)cptr) + offset; count--; dirp++) {
printf("d%d: %4d ",offset++,dirp->inumb);
cptr = dirp->nm;
for(j=0; j<DIRSIZ; j++) {
if(*cptr == '\0') break;
putf(*cptr++);
}
putc('\n',stdout);
erraddr = addr;
addr = addr + 16;
}
addr = erraddr;
return;
case 'o': /* print as octal words */
case 'e': /* print as decimal words */
addr = addr & ~01;
offset = offset >> 1;
iptr = ((short *)cptr) + offset;
#ifdef UCB_NKB
if(count == 0) count = (BSIZE/2) - offset;
if(offset + count > (BSIZE/2)) break;
#else
if(count == 0) count = 256 - offset;
if(offset + count > 256) break;
#endif
objsz = 2;
for(i=0; count--; i++) {
if(i % 8 == 0) {
/* this code deletes lines of zeros */
tptr = iptr;
k = count -1; /* always print last line */
for(j = i; k--; j++)
if(*tptr++ != 0) break;
if(j > (i + 7)) {
j = (j - i) >> 3;
while(j-- > 0){
iptr = iptr + 8;
count = count - 8;
i = i + 8;
addr = addr + 16;
}
printf("\n*");
}
printf("\n%6.7lo:",addr);
}
if(style == 'o')printf(" %6.6o",*iptr++ & 0177777);
else printf(" %6d",*iptr++);
erraddr = addr;
addr = addr + 2;
}
addr = erraddr;
putc('\n',stdout);
return;
case 'i': /* print as inodes */
if(icheck(addr)) return;
addr = addr & ~077;
offset = offset >> 6;
#ifdef UCB_NKB
if(count == 0) count = INOPB - offset;
if(count + offset > INOPB) break;
#else
if(count == 0) count = 8 - offset;
if(count + offset > 8) break;
#endif
type = INODE;
objsz = 64;
ip = ip + offset;
#ifdef UCB_NKB
temp = (addr - 2*BSIZE) / 64 + 1;
#else
temp = (addr - 1024) / 64 + 1;
#endif
for(i=0; count--; ip++) {
printf("i#:%6ld md: ",temp++);
p = " ugtrwxrwxrwx";
mode = ip->di_mode;
switch(mode & IFMT) {
case IFDIR: putc('d',stdout); break;
case IFCHR: putc('c',stdout); break;
case IFBLK: putc('b',stdout); break;
case IFREG: putc('f',stdout); break;
case IFIFO: putc('p',stdout); break;
default: putc('-',stdout); break;
}
for(mode = mode << 4; *++p; mode = mode << 1) {
if(mode & HIBIT) putc(*p,stdout);
else putc('-',stdout);
}
printf(" ln:%5d uid:%5d gid:%5d",
ip->di_nlink,ip->di_uid,ip->di_gid);
printf(" sz: %8lu\n", ip->di_size);
if(ip->di_mode & IFCHR)
printf("maj:%3.3o min:%3.3o ",
ip->di_addr[1] & 0377, ip->di_addr[0] & 0377);
else {
for(i = 0; i < NADDR; i++) {
l3tol(&tmp,&ip->di_addr[3*i],1);
printf("a%d:%6lu ",i,tmp);
if(i == 6) putc('\n',stdout);
}
putc('\n',stdout);
}
printf("at: %s",ctime(&ip->di_atime));
printf("mt: %s",ctime(&ip->di_mtime));
printf("ct: %s",ctime(&ip->di_ctime));
if(count) putc('\n',stdout);
cur_ino = erraddr = addr;
addr = addr + 64;
}
addr = erraddr;
return;
default: error++;
printf("no such print option\n");
return;
}
error++;
printf("block overflow\n");
}
/*
* reload - read new values for isize and fsize. These are
* the basis for most of the error checking procedures.
*/
reload()
{
long saddr;
short sv_objsz;
saddr = addr;
sv_objsz = objsz;
#ifdef UCB_NKB
addr = 02000;
#else
addr = 01000;
#endif
isize = get(2);
addr = SLOC;
fsize = get(4);
addr = saddr;
objsz = sv_objsz;
if(error) printf("cannot read superblock\n");
else printf("fsize = %ld, isize = %u\n",fsize,(isize - 2) * 8);
}
/*
* bcomp - compare the block numbers of two long addresses.
* Used to check for block over/under flows when stepping through
* a file system.
*/
bcomp(addr1,addr2)
long addr1;
long addr2;
{
if(override) return(0);
if((addr1 & ~(long)ADRMSK) == (addr2 & ~(long)ADRMSK)) return(0);
error++;
printf("block overflow\n");
return(1);
}
/*
* bmap - maps the logical block number of a file into
* the corresponding physical block on the file
* system. Algorithm is that of the version 7 bmap routine.
*/
long
bmap(bn)
long bn;
{
long nb;
int j, sh, i;
addr = cur_ino;
if(bn < NADDR - 3) {
addr += A0 + bn * 3;
return(nullblk(nb=get(3)) ? 0L : nb);
}
sh = 0;
nb = 1;
bn -= NADDR - 3;
for(j=3; j>0; j--) {
sh += NSHIFT;
nb = nb << NSHIFT;
if(bn < nb)
break;
bn -= nb;
}
if(j==0) {
error++;
printf("file too big\n");
return(0L);
}
addr += A0 + (NADDR - j) * 3;
if(nullblk(nb=get(3)))
return(0L);
for(; j<=3; j++) {
sh -= NSHIFT;
addr = (nb << BSHIFT) + 4 * ((bn >> sh) & NMASK);
if(nullblk(nb=get(4)))
return(0L);
}
return(nb);
}