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BSD 4_3_Tahoe release
[unix-history] / usr / src / etc / fsdb.c
/*
* Copyright (c) 1988 Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Computer Consoles Inc.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1988 Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)fsdb.c 5.3 (Berkeley) 6/18/88";
#endif /* not lint */
/*
* fsdb - file system debugger
*
* usage: fsdb [options] special
* options:
* -? display usage
* -o override some error conditions
* -p"string" set prompt to string
* -w open for write
*/
#include <sys/param.h>
#include <signal.h>
#include <sys/fs.h>
#include <sys/inode.h>
#include <sys/dir.h>
#include <sys/file.h>
#include <stdio.h>
#include <setjmp.h>
/*
* Never changing defines.
*/
#define OCTAL 8 /* octal base */
#define DECIMAL 10 /* decimal base */
#define HEX 16 /* hexadecimal base */
/*
* Adjustable defines.
*/
#define NBUF 10 /* number of cache buffers */
#define PROMPTSIZE 80 /* size of user definable prompt */
#define MAXFILES 40000 /* max number of files ls can handle */
#define FIRST_DEPTH 10 /* default depth for find and ls */
#define SECOND_DEPTH 100 /* second try at depth (maximum) */
#define INPUTBUFFER 1040 /* size of input buffer */
#define BYTESPERLINE 16 /* bytes per line of /dxo output */
#define NREG 36 /* number of save registers */
/*
* Values dependent on sizes of structs and such.
*/
#define NUMB 3 /* these three are arbitrary, */
#define BLOCK 5 /* but must be different from */
#define FRAGMENT 7 /* the rest (hence odd). */
#define BITSPERCHAR 8 /* couldn't find it anywhere */
#define CHAR (sizeof (char))
#define SHORT (sizeof (short))
#define LONG (sizeof (long))
#define INODE (sizeof (struct dinode))
#define DIRECTORY (sizeof (struct direct))
#define CGRP (sizeof (struct cg))
#define SB (sizeof (struct fs))
#define BLKSIZE (fs->fs_bsize) /* for clarity */
#define FRGSIZE (fs->fs_fsize)
#define BLKSHIFT (fs->fs_bshift)
#define FRGSHIFT (fs->fs_fshift)
/*
* Messy macros that would otherwise clutter up such glamorous code.
*/
#define itob(i) ((itod(fs, (i)) << FRGSHIFT) + itoo(fs, (i)) * INODE)
#define min(x, y) ((x) < (y) ? (x) : (y))
#define STRINGSIZE(d) ((long)d->d_reclen - \
((long)&d->d_name[0] - (long)&d->d_ino))
#define letter(c) ((((c) >= 'a')&&((c) <= 'z')) ||\
(((c) >= 'A')&&((c) <= 'Z')))
#define digit(c) (((c) >= '0') && ((c) <= '9'))
#define HEXLETTER(c) (((c) >= 'A') && ((c) <= 'F'))
#define hexletter(c) (((c) >= 'a') && ((c) <= 'f'))
#define octaldigit(c) (((c) >= '0') && ((c) <= '7'))
#define uppertolower(c) ((c) - 'A' + 'a')
#define hextodigit(c) ((c) - 'a' + 10)
#define numtodigit(c) ((c) - '0')
#define loword(X) (((ushort *)&X)[1])
#define lobyte(X) (((unsigned char *)&X)[1])
/*
* buffer cache structure.
*/
struct buf {
struct buf *fwd;
struct buf *back;
char *blkaddr;
short valid;
long blkno;
} buf[NBUF], bhdr;
/*
* used to hold save registers (see '<' and '>').
*/
struct save_registers {
long sv_addr;
long sv_value;
long sv_objsz;
} regs[NREG];
/*
* cd, find, and ls use this to hold filenames. Each filename is broken
* up by a slash. In other words, /usr/src/adm would have a len field
* of 2 (starting from 0), and filenames->fname[0-2] would hold usr,
* src, and adm components of the pathname.
*/
struct filenames {
long ino; /* inode */
long len; /* number of components */
char flag; /* flag if using SECOND_DEPTH allocator */
char find; /* flag if found by find */
char **fname; /* hold components of pathname */
} *filenames, *top;
struct fs filesystem, *fs; /* super block */
/*
* Global data.
*/
char *input_path[MAXPATHLEN];
char *stack_path[MAXPATHLEN];
char *current_path[MAXPATHLEN];
char input_buffer[INPUTBUFFER];
char *prompt;
char *buffers;
char scratch[64];
char BASE[] = "o u x";
char PROMPT[PROMPTSIZE] = "> ";
char laststyle = '/';
char lastpo = 'x';
short input_pointer;
short current_pathp;
short stack_pathp;
short input_pathp;
short cmp_level;
short nfiles;
short type = NUMB;
short dirslot;
short fd;
short c_count;
short error;
short paren;
short trapped;
short doing_cd;
short doing_find;
short find_by_name;
short find_by_inode;
short long_list;
short recursive;
short objsz = SHORT;
short override = 0;
short wrtflag;
short base = HEX;
short acting_on_inode;
short acting_on_directory;
short should_print = 1;
short clear;
short star;
long addr;
long bod_addr;
long value;
long erraddr;
long errcur_bytes;
long errino;
long errinum;
long cur_cgrp;
long cur_ino;
long cur_inum;
long cur_dir;
long cur_block;
long cur_bytes;
long find_ino;
long filesize;
long blocksize;
long stringsize;
long count = 1;
long commands;
long read_requests;
long actual_disk_reads;
jmp_buf env;
extern char *malloc(), *calloc();
char getachar();
char *getblk(), *fmtentry();
int err();
long get(), bmap(), expr(), term(), getnumb();
unsigned long *print_check();
/*
* main - lines are read up to the unprotected ('\') newline and
* held in an input buffer. Characters may be read from the
* input buffer using getachar() and unread using ungetachar().
* Reading the whole line ahead allows the use of debuggers
* which would otherwise be impossible since the debugger
* and fsdb could not share stdin.
*/
main(argc,argv)
short argc;
char **argv;
{
register char c, *cptr;
register short i, j, *iptr;
register struct direct *dirp;
register struct buf *bp;
struct filenames *fn;
char *progname;
short colon, mode;
long temp;
unsigned block;
int ffcmp();
setbuf(stdin, NULL);
progname = argv[0];
prompt = &PROMPT[0];
/*
* Parse options.
*/
while (argc>1 && argv[1][0] == '-') {
if (strcmp("-?", argv[1]) == 0)
goto usage;
if (strcmp("-o", argv[1]) == 0) {
printf("error checking off\n");
override = 1;
argc--; argv++;
continue;
}
if (strncmp("-p", argv[1],2) == 0) {
prompt = &argv[1][2];
argc--; argv++;
continue;
}
if (strcmp("-w", argv[1]) == 0) {
wrtflag = 2; /* suitable for open */
argc--; argv++;
continue;
}
}
if (argc!=2) {
usage:
printf("usage: %s [options] special\n", progname);
printf("options:\n");
printf("\t-? display usage\n");
printf("\t-o override some error conditions\n");
printf("\t-p\"string\" set prompt to string\n");
printf("\t-w open for write\n");
exit(1);
}
/*
* Attempt to open the special file.
*/
if ((fd = open(argv[1],wrtflag)) < 0) {
perror(argv[1]);
exit(1);
}
/*
* Read in the super block and validate (not too picky).
*/
if (lseek(fd, SBLOCK * DEV_BSIZE, 0) == -1) {
perror(argv[1]);
exit(1);
}
if (read(fd, &filesystem, sizeof filesystem) != sizeof filesystem) {
printf("%s: cannot read superblock\n", argv[1]);
exit(1);
}
fs = &filesystem;
if (fs->fs_magic != FS_MAGIC) {
printf("%s: Bad magic number in file system\n", argv[1]);
exit(1);
}
if (fs->fs_postblformat == FS_42POSTBLFMT)
fs->fs_nrpos = 8;
printf("fsdb of %s %s -- last mounted on %s\n",
argv[1], wrtflag ? "(Opened for write)" : "(Read only)",
&fs->fs_fsmnt[0]);
/*
* Malloc buffers and set up cache.
*/
buffers = malloc(NBUF * BLKSIZE);
bhdr.fwd = bhdr.back = &bhdr;
for (i=0; i<NBUF; i++) {
bp = &buf[i];
bp->blkaddr = buffers + (i * BLKSIZE);
bp->valid = 0;
insert(bp);
}
/*
* Malloc filenames structure. The space for the actual filenames
* is allocated as it needs it.
*/
filenames = (struct filenames *)calloc(MAXFILES,
sizeof (struct filenames));
if (filenames == NULL) {
printf("out of memory\n");
exit(1);
}
fn = filenames;
restore_inode(2);
/*
* Malloc a few filenames (needed by pwd for example).
*/
for (i = 0; i < MAXPATHLEN; i++) {
input_path[i] = calloc(1, MAXNAMLEN);
stack_path[i] = calloc(1, MAXNAMLEN);
current_path[i] = calloc(1, MAXNAMLEN);
if (current_path[i] == NULL) {
printf("out of memory\n");
exit(1);
}
}
current_pathp = -1;
signal(2,err);
setjmp(env);
getnextinput();
/*
* Main loop and case statement. If an error condition occurs
* initialization and recovery is attempted.
*/
for (;;) {
if (error) {
freemem(filenames, nfiles);
nfiles = 0;
c_count = 0;
count = 1;
star = 0;
error = 0;
paren = 0;
acting_on_inode = 0;
acting_on_directory = 0;
should_print = 1;
addr = erraddr;
cur_ino = errino;
cur_inum = errinum;
cur_bytes = errcur_bytes;
printf("?\n");
getnextinput();
if (error)
continue;
}
c_count++;
switch (c = getachar()) {
case '\n': /* command end */
freemem(filenames, nfiles);
nfiles = 0;
if (should_print && laststyle == '=') {
ungetachar(c);
goto calc;
}
if (c_count == 1) {
clear = 0;
should_print = 1;
erraddr = addr;
errino = cur_ino;
errinum = cur_inum;
errcur_bytes = cur_bytes;
switch (objsz) {
case DIRECTORY:
if ((addr =
getdirslot(dirslot+1)) == 0)
should_print = 0;
if (error) {
ungetachar(c);
continue;
}
break;
case INODE:
cur_inum++;
addr = itob(cur_inum);
if (!icheck(addr)) {
cur_inum--;
should_print = 0;
}
break;
case CGRP:
case SB:
cur_cgrp++;
if ((addr=cgrp_check(cur_cgrp)) == 0) {
cur_cgrp--;
continue;
}
break;
default:
addr += objsz;
cur_bytes += objsz;
if (valid_addr() == 0)
continue;
}
}
if (type == NUMB)
trapped = 0;
if (should_print)
switch (objsz) {
case DIRECTORY:
fprnt('?', 'd');
break;
case INODE:
fprnt('?', 'i');
if (!error)
cur_ino = addr;
break;
case CGRP:
fprnt('?', 'c');
break;
case SB:
fprnt('?', 's');
break;
case CHAR:
case SHORT:
case LONG:
fprnt(laststyle, lastpo);
}
if (error) {
ungetachar(c);
continue;
}
c_count = colon = acting_on_inode = 0;
acting_on_directory = 0;
should_print = 1;
getnextinput();
if (error)
continue;
erraddr = addr;
errino = cur_ino;
errinum = cur_inum;
errcur_bytes = cur_bytes;
continue;
case '(': /* numeric expression or unknown command */
default:
colon = 0;
if (digit(c) || c == '(') {
ungetachar(c);
addr = expr();
type = NUMB;
value = addr;
continue;
}
printf("unknown command or bad syntax\n");
error++;
continue;
case '?': /* general print facilities */
case '/':
fprnt(c, getachar());
continue;
case ';': /* command separator and . */
case '\t':
case ' ':
case '.':
continue;
case ':': /* command indicator */
colon++;
commands++;
should_print = 0;
stringsize = 0;
trapped = 0;
continue;
case ',': /* count indicator */
colon = star = 0;
if ((c = getachar()) == '*') {
star = 1;
count = BLKSIZE;
} else {
ungetachar(c);
count = expr();
if (error)
continue;
if (!count)
count = 1;
}
clear = 0;
continue;
case '+': /* address addition */
colon = 0;
c = getachar();
ungetachar(c);
if (c == '\n')
temp = 1;
else {
temp = expr();
if (error)
continue;
}
erraddr = addr;
errcur_bytes = cur_bytes;
switch (objsz) {
case DIRECTORY:
addr = getdirslot(dirslot + temp);
if (error)
continue;
break;
case INODE:
cur_inum += temp;
addr = itob(cur_inum);
if (!icheck(addr)) {
cur_inum -= temp;
continue;
}
break;
case CGRP:
case SB:
cur_cgrp += temp;
if ((addr = cgrp_check(cur_cgrp)) == 0) {
cur_cgrp -= temp;
continue;
}
break;
default:
laststyle = '/';
addr += temp * objsz;
cur_bytes += temp * objsz;
if (valid_addr() == 0)
continue;
}
value = get(objsz);
continue;
case '-': /* address subtraction */
colon = 0;
c = getachar();
ungetachar(c);
if (c == '\n')
temp = 1;
else {
temp = expr();
if (error)
continue;
}
erraddr = addr;
errcur_bytes = cur_bytes;
switch (objsz) {
case DIRECTORY:
addr = getdirslot(dirslot - temp);
if (error)
continue;
break;
case INODE:
cur_inum -= temp;
addr = itob(cur_inum);
if (!icheck(addr)) {
cur_inum += temp;
continue;
}
break;
case CGRP:
case SB:
cur_cgrp -= temp;
if ((addr = cgrp_check(cur_cgrp)) == 0) {
cur_cgrp += temp;
continue;
}
break;
default:
laststyle = '/';
addr -= temp * objsz;
cur_bytes -= temp * objsz;
if (valid_addr() == 0)
continue;
}
value = get(objsz);
continue;
case '*': /* address multiplication */
colon = 0;
temp = expr();
if (error)
continue;
if (objsz != INODE && objsz != DIRECTORY)
laststyle = '/';
addr *= temp;
value = get(objsz);
continue;
case '%': /* address division */
colon = 0;
temp = expr();
if (error)
continue;
if (!temp) {
printf("divide by zero\n");
error++;
continue;
}
if (objsz != INODE && objsz != DIRECTORY)
laststyle = '/';
addr /= temp;
value = get(objsz);
continue;
case '=': { /* assignment operation */
short tbase = base;
calc:
c = getachar();
if (c == '\n') {
ungetachar(c);
c = lastpo;
if (acting_on_inode == 1) {
if (c != 'o' && c != 'd' && c != 'x' &&
c != 'O' && c != 'D' && c != 'X') {
switch (objsz) {
case LONG:
c = lastpo = 'X';
break;
case SHORT:
c = lastpo = 'x';
break;
case CHAR:
c = lastpo = 'c';
}
}
} else {
if (acting_on_inode == 2)
c = lastpo = 't';
}
} else if (acting_on_inode)
lastpo = c;
should_print = star = 0;
count = 1;
erraddr = addr;
errcur_bytes = cur_bytes;
switch (c) {
case '"': /* character string */
if (type == NUMB) {
blocksize = BLKSIZE;
filesize = BLKSIZE * 2;
cur_bytes = blkoff(fs, addr);
if (objsz==DIRECTORY || objsz==INODE)
lastpo = 'X';
}
puta();
continue;
case '+': /* =+ operator */
temp = expr();
value = get(objsz);
if (!error)
put(value+temp,objsz);
continue;
case '-': /* =- operator */
temp = expr();
value = get(objsz);
if (!error)
put(value-temp,objsz);
continue;
case 'b':
case 'c':
if (objsz == CGRP)
fprnt('?', c);
else
fprnt('/', c);
continue;
case 'i':
addr = cur_ino;
fprnt('?', 'i');
continue;
case 's':
fprnt('?', 's');
continue;
case 't':
case 'T':
laststyle = '=';
printf("\t\t");
printf("%s", ctime(&value));
continue;
case 'o':
base = OCTAL;
goto otx;
case 'd':
if (objsz == DIRECTORY) {
addr = cur_dir;
fprnt('?', 'd');
continue;
}
base = DECIMAL;
goto otx;
case 'x':
base = HEX;
otx:
laststyle = '=';
printf("\t\t");
if (acting_on_inode)
print(value & 0177777L, 12, -8, 0);
else
print(addr & 0177777L, 12, -8, 0);
printf("\n");
base = tbase;
continue;
case 'O':
base = OCTAL;
goto OTX;
case 'D':
base = DECIMAL;
goto OTX;
case 'X':
base = HEX;
OTX:
laststyle = '=';
printf("\t\t");
if (acting_on_inode)
print(value, 12, -8, 0);
else
print(addr, 12, -8, 0);
printf("\n");
base = tbase;
continue;
default: /* regular assignment */
ungetachar(c);
value = expr();
if (error)
printf("syntax error\n");
else
put(value,objsz);
continue;
}
}
case '>': /* save current address */
colon = 0;
should_print = 0;
c = getachar();
if (!letter(c) && !digit(c)) {
printf("invalid register specification, ");
printf("must be letter or digit\n");
error++;
continue;
}
if (letter(c)) {
if (c < 'a')
c = uppertolower(c);
c = hextodigit(c);
} else
c = numtodigit(c);
regs[c].sv_addr = addr;
regs[c].sv_value = value;
regs[c].sv_objsz = objsz;
continue;
case '<': /* restore saved address */
colon = 0;
should_print = 0;
c = getachar();
if (!letter(c) && !digit(c)) {
printf("invalid register specification, ");
printf("must be letter or digit\n");
error++;
continue;
}
if (letter(c)) {
if (c < 'a')
c = uppertolower(c);
c = hextodigit(c);
} else
c = numtodigit(c);
addr = regs[c].sv_addr;
value = regs[c].sv_value;
objsz = regs[c].sv_objsz;
continue;
case 'a':
if (colon)
colon = 0;
else
goto no_colon;
if (match("at", 2)) { /* access time */
acting_on_inode = 2;
should_print = 1;
addr = (long)
&((struct dinode *)cur_ino)->di_atime;
value = get(LONG);
type = NULL;
continue;
}
goto bad_syntax;
case 'b':
if (colon)
colon = 0;
else
goto no_colon;
if (match("block", 2)) { /* block conversion */
if (type == NUMB) {
value = addr;
cur_bytes = 0;
blocksize = BLKSIZE;
filesize = BLKSIZE * 2;
}
addr = value << FRGSHIFT;
bod_addr = addr;
value = get(LONG);
type = BLOCK;
dirslot = 0;
trapped++;
continue;
}
if (match("bs", 2)) { /* block size */
acting_on_inode = 1;
should_print = 1;
if (icheck(cur_ino) == 0)
continue;
addr = (long)
&((struct dinode *)cur_ino)->di_blocks;
value = get(LONG);
type = NULL;
continue;
}
if (match("base", 2)) { /* change/show base */
showbase:
if ((c = getachar()) == '\n') {
ungetachar(c);
printf("base =\t\t");
switch (base) {
case OCTAL:
printf("OCTAL\n");
continue;
case DECIMAL:
printf("DECIMAL\n");
continue;
case HEX:
printf("HEX\n");
continue;
}
}
if (c != '=') {
printf("missing '='\n");
error++;
continue;
}
value = expr();
switch (value) {
default:
printf("invalid base\n");
error++;
break;
case OCTAL:
case DECIMAL:
case HEX:
base = value;
}
goto showbase;
}
goto bad_syntax;
case 'c':
if (colon)
colon = 0;
else
goto no_colon;
if (match("cd", 2)) { /* change directory */
top = filenames - 1;
eat_spaces();
if ((c = getachar()) == '\n') {
ungetachar(c);
current_pathp = -1;
restore_inode(2);
continue;
}
ungetachar(c);
temp = cur_inum;
doing_cd = 1;
parse();
doing_cd = 0;
if (nfiles != 1) {
restore_inode(temp);
if (!error) {
print_path(input_path,
input_pathp);
if (nfiles == 0)
printf(" not found\n");
else
printf(" ambiguous\n");
error++;
}
continue;
}
restore_inode(filenames->ino);
if ((mode = icheck(addr)) == 0)
continue;
if ((mode & IFMT) != IFDIR) {
restore_inode(temp);
print_path(input_path, input_pathp);
printf(" not a directory\n");
error++;
continue;
}
for (i = 0; i <= top->len; i++)
strcpy(current_path[i],
top->fname[i]);
current_pathp = top->len;
continue;
}
if (match("cg", 2)) { /* cylinder group */
if (type == NUMB)
value = addr;
if (value > fs->fs_ncg - 1) {
printf("maximum cylinder group is ");
print(fs->fs_ncg - 1, 8, -8, 0);
printf("\n");
error++;
continue;
}
type = objsz = CGRP;
cur_cgrp = value;
addr = cgtod(fs, cur_cgrp) << FRGSHIFT;
continue;
}
if (match("ct", 2)) { /* creation time */
acting_on_inode = 2;
should_print = 1;
addr = (long)
&((struct dinode *)cur_ino)->di_ctime;
value = get(LONG);
type = NULL;
continue;
}
goto bad_syntax;
case 'd':
if (colon)
colon = 0;
else
goto no_colon;
if (match("directory", 2)) { /* directory offsets */
if (type == NUMB)
value = addr;
objsz = DIRECTORY;
type = DIRECTORY;
addr = getdirslot(value);
continue;
}
if (match("db", 2)) { /* direct block */
acting_on_inode = 1;
should_print = 1;
if (type == NUMB)
value = addr;
if (value >= NDADDR) {
printf("direct blocks are 0 to ");
print(NDADDR - 1, 0, 0, 0);
printf("\n");
error++;
continue;
}
addr = cur_ino;
if (!icheck(addr))
continue;
addr = (long)
&((struct dinode *)cur_ino)->di_db[value];
bod_addr = addr;
cur_bytes = (value) * BLKSIZE;
cur_block = value;
type = BLOCK;
dirslot = 0;
value = get(LONG);
if (!value && !override) {
printf("non existent block\n");
error++;
}
continue;
}
goto bad_syntax;
case 'f':
if (colon)
colon = 0;
else
goto no_colon;
if (match("find", 3)) { /* find command */
find();
continue;
}
if (match("fragment", 2)) { /* fragment conv. */
if (type == NUMB) {
value = addr;
cur_bytes = 0;
blocksize = FRGSIZE;
filesize = FRGSIZE * 2;
}
if (min(blocksize, filesize) - cur_bytes >
FRGSIZE) {
blocksize = cur_bytes + FRGSIZE;
filesize = blocksize * 2;
}
addr = value << FRGSHIFT;
bod_addr = addr;
value = get(LONG);
type = FRAGMENT;
dirslot = 0;
trapped++;
continue;
}
if (match("file", 4)) { /* access as file */
acting_on_inode = 1;
should_print = 1;
if (type == NUMB)
value = addr;
addr = cur_ino;
if ((mode = icheck(addr)) == 0)
continue;
if ((mode & IFCHR) && !override) {
printf("special device\n");
error++;
continue;
}
if ((addr = (bmap(value) << FRGSHIFT)) == 0)
continue;
cur_block = value;
bod_addr = addr;
type = BLOCK;
dirslot = 0;
continue;
}
if (match("fill", 4)) { /* fill */
if (getachar() != '=') {
printf("missing '='\n");
error++;
continue;
}
if (objsz == INODE || objsz == DIRECTORY) {
printf("can't fill inode or directory\n");
error++;
continue;
}
fill();
continue;
}
goto bad_syntax;
case 'g':
if (colon)
colon = 0;
else
goto no_colon;
if (match("gid", 1)) { /* group id */
acting_on_inode = 1;
should_print = 1;
addr = (long)
&((struct dinode *)cur_ino)->di_gid;
value = get(SHORT);
type = NULL;
continue;
}
goto bad_syntax;
case 'i':
if (colon)
colon = 0;
else
goto no_colon;
if (match("inode", 2)) { /* i# to inode conversion */
if (c_count == 2) {
addr = cur_ino;
value = get(INODE);
type = NULL;
laststyle = '=';
lastpo = 'i';
should_print = 1;
continue;
}
if (type == NUMB)
value = addr;
addr = itob(value);
if (!icheck(addr))
continue;
cur_ino = addr;
cur_inum = value;
value = get(INODE);
type = NULL;
continue;
}
if (match("ib", 2)) { /* indirect block */
acting_on_inode = 1;
should_print = 1;
if (type == NUMB)
value = addr;
if (value >= NIADDR) {
printf("indirect blocks are 0 to ");
print(NIADDR - 1, 0, 0, 0);
printf("\n");
error++;
continue;
}
addr = (long)
&((struct dinode *)cur_ino)->di_ib[value];
cur_bytes = (NDADDR - 1) * BLKSIZE;
temp = 1;
for (i = 0; i < value; i++) {
temp *= NINDIR(fs) * BLKSIZE;
cur_bytes += temp;
}
type = BLOCK;
dirslot = 0;
value = get(LONG);
if (!value && !override) {
printf("non existent block\n");
error++;
}
continue;
}
goto bad_syntax;
case 'l':
if (colon)
colon = 0;
else
goto no_colon;
if (match("ls", 2)) { /* ls command */
temp = cur_inum;
recursive = long_list = 0;
top = filenames - 1;
for (;;) {
eat_spaces();
if ((c = getachar()) == '-') {
if ((c = getachar()) == 'R') {
recursive = 1;
continue;
} else if (c == 'l') {
long_list = 1;
} else {
printf("unknown option ");
printf("'%c'\n", c);
error++;
break;
}
} else
ungetachar(c);
if ((c = getachar()) == '\n') {
if (c_count != 2) {
ungetachar(c);
break;
}
}
c_count++;
ungetachar(c);
parse();
restore_inode(temp);
if (error)
break;
}
recursive = 0;
if (error || nfiles == 0) {
if (!error) {
print_path(input_path,
input_pathp);
printf(" not found\n");
}
continue;
}
if (nfiles) {
cmp_level = 0;
qsort((char *)filenames, nfiles,
sizeof (struct filenames), ffcmp);
ls(filenames, filenames + (nfiles - 1), 0);
} else {
printf("no match\n");
error++;
}
restore_inode(temp);
continue;
}
if (match("ln", 2)) { /* link count */
acting_on_inode = 1;
should_print = 1;
addr = (long)
&((struct dinode *)cur_ino)->di_nlink;
value = get(SHORT);
type = NULL;
continue;
}
goto bad_syntax;
case 'm':
if (colon)
colon = 0;
else
goto no_colon;
addr = cur_ino;
if ((mode = icheck(addr)) == 0)
continue;
if (match("mt", 2)) { /* modification time */
acting_on_inode = 2;
should_print = 1;
addr = (long)
&((struct dinode *)cur_ino)->di_mtime;
value = get(LONG);
type = NULL;
continue;
}
if (match("md", 2)) { /* mode */
acting_on_inode = 1;
should_print = 1;
addr = (long)
&((struct dinode *)cur_ino)->di_mode;
value = get(SHORT);
type = NULL;
continue;
}
if (match("maj", 2)) { /* major device number */
acting_on_inode = 1;
should_print = 1;
if (devcheck(mode))
continue;
addr = (long)
&((struct dinode *)cur_ino)->di_db[1];
value = get(LONG);
type = NULL;
continue;
}
if (match("min", 2)) { /* minor device number */
acting_on_inode = 1;
should_print = 1;
if (devcheck(mode))
continue;
addr = (long)
&((struct dinode *)cur_ino)->di_db[0];
value = get(LONG);
type = NULL;
continue;
}
goto bad_syntax;
case 'n':
if (colon)
colon = 0;
else
goto no_colon;
if (match("nm", 1)) { /* directory name */
objsz = DIRECTORY;
acting_on_directory = 1;
cur_dir = addr;
if ((cptr = getblk(addr)) == 0)
continue;
dirp = (struct direct *)(cptr+blkoff(fs, addr));
stringsize = (long)dirp->d_reclen -
((long)&dirp->d_name[0] - (long)&dirp->d_ino);
addr = (long)
&((struct direct *)addr)->d_name[0];
type = NULL;
continue;
}
goto bad_syntax;
case 'o':
if (colon)
colon = 0;
else
goto no_colon;
if (match("override", 1)) { /* override flip flop */
if (override = !override)
printf("error checking off\n");
else
printf("error checking on\n");
continue;
}
goto bad_syntax;
case 'p':
if (colon)
colon = 0;
else
goto no_colon;
if (match("pwd", 2)) { /* print working dir */
print_path(current_path, current_pathp);
printf("\n");
continue;
}
if (match("prompt", 2)) { /* change prompt */
if ((c = getachar()) != '=') {
printf("missing '='\n");
error++;
continue;
}
if ((c = getachar()) != '"') {
printf("missing '\"'\n");
error++;
continue;
}
i = 0;
prompt = &prompt[0];
while ((c = getachar()) != '"' &&
c != '\n') {
prompt[i++] = c;
if (i >= PROMPTSIZE) {
printf("string too long\n");
error++;
break;
}
}
prompt[i] = '\0';
continue;
}
goto bad_syntax;
case 'q':
if (!colon)
goto no_colon;
if (match("quit", 1)) { /* quit */
if ((c = getachar()) != '\n') {
error++;
continue;
}
exit(0);
}
goto bad_syntax;
case 's':
if (colon)
colon = 0;
else
goto no_colon;
if (match("sb", 2)) { /* super block */
if (c_count == 2) {
cur_cgrp = -1;
type = objsz = SB;
laststyle = '=';
lastpo = 's';
should_print = 1;
continue;
}
if (type == NUMB)
value = addr;
if (value > fs->fs_ncg - 1) {
printf("maximum super block is ");
print(fs->fs_ncg - 1, 8, -8, 0);
printf("\n");
error++;
continue;
}
type = objsz = SB;
cur_cgrp = value;
addr = cgsblock(fs, cur_cgrp) << FRGSHIFT;
continue;
}
if (match("sz", 2)) { /* file size */
acting_on_inode = 1;
should_print = 1;
addr = (long)
&((struct dinode *)cur_ino)->di_size;
value = get(LONG);
type = NULL;
continue;
}
goto bad_syntax;
case 'u':
if (colon)
colon = 0;
else
goto no_colon;
if (match("uid", 1)) { /* user id */
acting_on_inode = 1;
should_print = 1;
addr = (long)
&((struct dinode *)cur_ino)->di_uid;
value = get(SHORT);
type = NULL;
continue;
}
goto bad_syntax;
case 'F': /* buffer status (internal use only) */
if (colon)
colon = 0;
else
goto no_colon;
for (bp = bhdr.fwd; bp != &bhdr; bp = bp->fwd)
printf("%8x %d\n",bp->blkno,bp->valid);
printf("\n");
printf("# commands\t\t%d\n", commands);
printf("# read requests\t\t%d\n", read_requests);
printf("# actual disk reads\t%d\n", actual_disk_reads);
continue;
no_colon:
printf("a colon should precede a command\n");
error++;
continue;
bad_syntax:
printf("more letters needed to distinguish command\n");
error++;
continue;
}
}
}
/*
* getachar - get next character from input buffer.
*/
char
getachar()
{
return(input_buffer[input_pointer++]);
}
/*
* ungetachar - return character to input buffer.
*/
ungetachar(c)
register char c;
{
if (input_pointer == 0) {
printf("internal problem maintaining input buffer\n");
error++;
return;
}
input_buffer[--input_pointer] = c;
}
/*
* getnextinput - display the prompt and read an input line.
* An input line is up to 128 characters terminated by the newline
* character. Handle overflow, shell escape, and eof.
*/
getnextinput()
{
register int i;
register char c;
register short pid, rpid;
int retcode;
newline:
i = 0;
printf("%s", prompt);
ignore_eol:
while ((c = getc(stdin)) != '\n' && !(c == '!' && i == 0) &&
!feof(stdin) && i <= INPUTBUFFER - 2)
input_buffer[i++] = c;
if (input_buffer[i - 1] == '\\') {
input_buffer[i++] = c;
goto ignore_eol;
}
if (feof(stdin)) {
printf("\n");
exit(0);
}
if (c == '!') {
if ((pid = fork()) == 0) {
execl("/bin/sh", "sh", "-t", 0);
error++;
return;
}
while ((rpid = wait(&retcode)) != pid && rpid != -1)
;
printf("!\n");
goto newline;
}
if (c != '\n')
printf("input truncated to 128 characters\n");
input_buffer[i] = '\n';
input_pointer = 0;
}
/*
* eat_spaces - read extraneous spaces.
*/
eat_spaces()
{
register char c;
while ((c = getachar()) == ' ')
;
ungetachar(c);
}
/*
* restore_inode - set up all inode indicators so inum is now
* the current inode.
*/
restore_inode(inum)
long inum;
{
errinum = cur_inum = inum;
addr = errino = cur_ino = itob(inum);
}
/*
* match - return false if the input does not match string up to
* upto letters. Then proceed to chew up extraneous letters.
*/
match(string, upto)
register char *string;
register int upto;
{
register int i, length = strlen(string) - 1;
register char c;
int save_upto = upto;
while (--upto) {
string++;
if ((c = getachar()) != *string) {
for (i = save_upto - upto; i; i--) {
ungetachar(c);
c = *--string;
}
return(0);
}
length--;
}
while (length--) {
string++;
if ((c = getachar()) != *string) {
ungetachar(c);
return(1);
}
}
return(1);
}
/*
* expr - expression evaluator. Will evaluate expressions from
* left to right with no operator precedence. Parentheses may
* be used.
*/
long
expr()
{
register long numb = 0, temp;
register char c;
numb = term();
for (;;) {
if (error)
return;
c = getachar();
switch (c) {
case '+':
numb += term();
continue;
case '-':
numb -= term();
continue;
case '*':
numb *= term();
continue;
case '%':
temp = term();
if (!temp) {
printf("divide by zero\n");
error++;
return;
}
numb /= temp;
continue;
case ')':
paren--;
return(numb);
default:
ungetachar(c);
if (paren && !error) {
printf("missing ')'\n");
error++;
}
return(numb);
}
}
}
/*
* term - used by expression evaluator to get an operand.
*/
long
term()
{
register char c;
switch (c = getachar()) {
default:
ungetachar(c);
case '+':
return(getnumb());
case '-':
return(-getnumb());
case '(':
paren++;
return(expr());
}
}
/*
* getnumb - read a number from the input stream. A leading
* zero signifies octal interpretation, a leading '0x'
* signifies hexadecimal, and a leading '0t' signifies
* decimal. If the first character is a character,
* return an error.
*/
long
getnumb()
{
register char c, savec;
long number = 0, tbase, num;
extern short error;
c = getachar();
if (!digit(c)) {
error++;
ungetachar(c);
return(-1);
}
if (c == '0') {
tbase = OCTAL;
if ((c = getachar()) == 'x')
tbase = HEX;
else if (c == 't')
tbase = DECIMAL;
else ungetachar(c);
} else {
tbase = base;
ungetachar(c);
}
for (;;) {
num = tbase;
c = savec = getachar();
if (HEXLETTER(c))
c = uppertolower(c);
switch (tbase) {
case HEX:
if (hexletter(c)) {
num = hextodigit(c);
break;
}
case DECIMAL:
if (digit(c))
num = numtodigit(c);
break;
case OCTAL:
if (octaldigit(c))
num = numtodigit(c);
}
if (num == tbase)
break;
number = number * tbase + num;
}
ungetachar(savec);
return(number);
}
/*
* find - the syntax is almost identical to the unix command.
* find dir [-name pattern] [-inum number]
* Note: only one of -name or -inum may be used at a time.
* Also, the -print is not needed (implied).
*/
find()
{
register struct filenames *fn;
register char c;
long temp;
short mode;
eat_spaces();
temp = cur_inum;
top = filenames - 1;
doing_cd = 1;
parse();
doing_cd = 0;
if (nfiles != 1) {
restore_inode(temp);
if (!error) {
print_path(input_path, input_pathp);
if (nfiles == 0)
printf(" not found\n");
else
printf(" ambiguous\n");
error++;
return;
}
}
restore_inode(filenames->ino);
freemem(filenames, nfiles);
nfiles = 0;
top = filenames - 1;
if ((mode = icheck(addr)) == 0)
return;
if ((mode & IFMT) != IFDIR) {
print_path(input_path, input_pathp);
printf(" not a directory\n");
error++;
return;
}
eat_spaces();
if ((c = getachar()) != '-') {
printf("missing '-'\n");
error++;
return;
}
find_by_name = find_by_inode = 0;
c = getachar();
if (match("name", 4)) {
eat_spaces();
find_by_name = 1;
} else if (match("inum", 4)) {
eat_spaces();
find_ino = expr();
if (error)
return;
while ((c = getachar()) != '\n')
;
ungetachar(c);
find_by_inode = 1;
} else {
printf("use -name or -inum with find\n");
error++;
return;
}
doing_find = 1;
parse();
doing_find = 0;
if (error) {
restore_inode(temp);
return;
}
for (fn = filenames; fn <= top; fn++) {
if (fn->find == 0)
continue;
printf("i#: ");
print(fn->ino, 12, -8, 0);
print_path(fn->fname, fn->len);
printf("\n");
}
restore_inode(temp);
}
/*
* ls - do an ls. Should behave exactly as ls(1).
* Only -R and -l is supported and -l gives different results.
*/
ls(fn0, fnlast, level)
struct filenames *fn0, *fnlast;
short level;
{
register struct filenames *fn, *fnn;
register int i;
int fcmp();
fn = fn0;
for (;;) {
fn0 = fn;
if (fn0->len) {
cmp_level = level;
qsort((char *)fn0, fnlast - fn0 + 1,
sizeof (struct filenames), fcmp);
}
for (fnn = fn, fn++; fn <= fnlast; fnn = fn, fn++) {
if (fnn->len != fn->len && level == fnn->len - 1)
break;
if (fnn->len == 0)
continue;
if (strcmp(fn->fname[level], fnn->fname[level]))
break;
}
if (fn0->len && level != fn0->len - 1)
ls(fn0, fnn, level + 1);
else {
if (fn0 != filenames)
printf("\n");
print_path(fn0->fname, fn0->len - 1);
printf(":\n");
if (fn0->len == 0)
cmp_level = level;
else
cmp_level = level + 1;
qsort((char *)fn0, fnn - fn0 + 1,
sizeof (struct filenames), fcmp);
formatf(fn0, fnn);
nfiles -= fnn - fn0 + 1;
}
if (fn > fnlast)
return;
}
}
/*
* formatf - code lifted from ls.
*/
formatf(fn0, fnlast)
register struct filenames *fn0, *fnlast;
{
register struct filenames *fn;
int width = 0, w, nentry = fnlast - fn0 + 1;
int i, j, columns, lines;
char *cp;
if (long_list) {
columns = 1;
} else {
for (fn = fn0; fn <= fnlast; fn++) {
int len = strlen(fn->fname[cmp_level]) + 2;
if (len > width)
width = len;
}
width = (width + 8) &~ 7;
columns = 80 / width;
if (columns == 0)
columns = 1;
}
lines = (nentry + columns - 1) / columns;
for (i = 0; i < lines; i++) {
for (j = 0; j < columns; j++) {
fn = fn0 + j * lines + i;
if (long_list) {
printf("i#: ");
print(fn->ino, 12, -8, 0);
}
cp = fmtentry(fn);
printf("%s", cp);
if (fn + lines > fnlast) {
printf("\n");
break;
}
w = strlen(cp);
while (w < width) {
w = (w + 8) &~ 7;
putchar('\t');
}
}
}
}
/*
* fmtentry - code lifted from ls.
*/
char *
fmtentry(fn)
register struct filenames *fn;
{
static char fmtres[BUFSIZ];
register struct dinode *ip;
register char *cptr, *cp, *dp;
dp = &fmtres[0];
for (cp = fn->fname[cmp_level]; *cp; cp++) {
if (*cp < ' ' || *cp >= 0177)
*dp++ = '?';
else
*dp++ = *cp;
}
addr = itob(fn->ino);
if ((cptr = getblk(addr)) == 0)
return(NULL);
cptr += blkoff(fs, addr);
ip = (struct dinode *)cptr;
switch (ip->di_mode & IFMT) {
case IFDIR:
*dp++ = '/';
break;
case IFLNK:
*dp++ = '@';
break;
case IFSOCK:
*dp++ = '=';
break;
/* case IFIFO:
*dp++ = 'f';
break; SYSTEM V only */
case IFCHR:
case IFBLK:
case IFREG:
if (ip->di_mode & 0111)
*dp++ = '*';
else
*dp++ = ' ';
break;
default:
*dp++ = '?';
}
*dp++ = 0;
return (fmtres);
}
/*
* fcmp - routine used by qsort. Will sort first by name, then
* then by pathname length if names are equal. Uses global
* cmp_level to tell what component of the path name we are comparing.
*/
fcmp(f1, f2)
register struct filenames *f1, *f2;
{
int value;
if ((value = strcmp(f1->fname[cmp_level], f2->fname[cmp_level])))
return(value);
return (f1->len - f2->len);
}
/*
* ffcmp - routine used by qsort. Sort only by pathname length.
*/
ffcmp(f1, f2)
register struct filenames *f1, *f2;
{
return (f1->len - f2->len);
}
/*
* parse - set up the call to follow_path.
*/
parse()
{
register int i, j;
char c;
stack_pathp = input_pathp = -1;
if ((c = getachar()) == '/') {
while ((c = getachar()) == '/')
;
ungetachar(c);
cur_inum = 2;
if ((c = getachar()) == '\n') {
ungetachar('\n');
if (doing_cd) {
top++;
top->ino = 2;
top->len = -1;
nfiles = 1;
return;
}
} else
ungetachar(c);
} else {
ungetachar(c);
stack_pathp = current_pathp;
if (!doing_find)
input_pathp = current_pathp;
for (i = 0; i <= current_pathp; i++) {
if (!doing_find)
strcpy(input_path[i], current_path[i]);
strcpy(stack_path[i], current_path[i]);
}
}
getname();
follow_path(stack_pathp + 1, cur_inum);
}
/*
* follow_path - called by cd, find, and ls.
* input_path holds the name typed by the user.
* stack_path holds the name at the current depth.
*/
follow_path(level, inum)
long level, inum;
{
register struct direct *dirp;
register char **ccptr, *cptr, c;
register int i;
struct filenames *tos, *bos, *fn, *fnn, *fnnn;
long block;
short mode;
tos = top + 1;
restore_inode(inum);
if ((mode = icheck(addr)) == 0)
return;
if ((mode & IFMT) != IFDIR)
return;
block = cur_bytes = 0;
while (cur_bytes < filesize) {
if (block == 0 || bcomp(addr)) {
error = 0;
if ((addr = (bmap(block++) << FRGSHIFT)) == 0)
break;
if ((cptr = getblk(addr)) == 0)
break;
cptr += blkoff(fs, addr);
}
dirp = (struct direct *)cptr;
if (dirp->d_ino) {
if (level > input_pathp || doing_find ||
compare(input_path[level], &dirp->d_name[0], 1)) {
if (++top - filenames >= MAXFILES) {
printf("too many files\n");
error++;
return;
}
top->fname = (char **)calloc(FIRST_DEPTH, sizeof (char **));
top->flag = 0;
if (top->fname == 0) {
printf("out of memory\n");
error++;
return;
}
nfiles++;
top->ino = dirp->d_ino;
top->len = stack_pathp;
top->find = 0;
if (doing_find) {
if (find_by_name) {
if (compare(input_path[0], &dirp->d_name[0], 1))
top->find = 1;
} else if (find_by_inode)
if (find_ino == dirp->d_ino)
top->find = 1;
}
if (top->len + 1 >= FIRST_DEPTH && top->flag == 0) {
ccptr = (char **)calloc(SECOND_DEPTH, sizeof (char **));
if (ccptr == 0) {
printf("out of memory\n");
error++;
return;
}
for (i = 0; i < FIRST_DEPTH; i++)
ccptr[i] = top->fname[i];
free((char *)top->fname);
top->fname = ccptr;
top->flag = 1;
}
if (top->len >= SECOND_DEPTH) {
printf("maximum depth exceeded, try to cd lower\n");
error++;
return;
}
/*
* Copy current depth.
*/
for (i = 0; i <= stack_pathp; i++) {
top->fname[i]=calloc(1, strlen(stack_path[i])+1);
if (top->fname[i] == 0) {
printf("out of memory\n");
error++;
return;
}
strcpy(top->fname[i], stack_path[i]);
}
/*
* Check for '.' or '..' typed.
*/
if ((level <= input_pathp) &&
(strcmp(input_path[level], ".") == 0 ||
strcmp(input_path[level], "..") == 0)) {
if (strcmp(input_path[level],"..") == 0 &&
top->len >= 0) {
free(top->fname[top->len]);
top->len -= 1;
}
} else {
/*
* Check for duplicates.
*/
if (!doing_cd && !doing_find) {
for (fn = filenames; fn < top; fn++) {
if (fn->ino == dirp->d_ino &&
fn->len == stack_pathp + 1) {
for (i = 0; i < fn->len; i++)
if (strcmp(fn->fname[i], stack_path[i]))
break;
if (i != fn->len ||
strcmp(fn->fname[i], dirp->d_name))
continue;
freemem(top, 1);
if (top == filenames)
top = NULL;
else
top--;
nfiles--;
goto duplicate;
}
}
}
top->len += 1;
top->fname[top->len] = calloc(1,
strlen(&dirp->d_name[0])+1);
if (top->fname[top->len] == 0) {
printf("out of memory\n");
error++;
return;
}
strcpy(top->fname[top->len], &dirp->d_name[0]);
}
}
}
duplicate:
addr += dirp->d_reclen;
cptr += dirp->d_reclen;
cur_bytes += dirp->d_reclen;
}
if (top < filenames)
return;
if ((doing_cd && level == input_pathp) ||
(!recursive && !doing_find && level > input_pathp))
return;
bos = top;
/*
* Check newly added entries to determine if further expansion
* is required.
*/
for (fn = tos; fn <= bos; fn++) {
/*
* Avoid '.' and '..' if beyond input.
*/
if ((recursive || doing_find) && (level > input_pathp) &&
(strcmp(fn->fname[fn->len], ".") == 0 ||
strcmp(fn->fname[fn->len], "..") == 0))
continue;
restore_inode(fn->ino);
if ((mode = icheck(cur_ino)) == 0)
return;
if ((mode & IFMT) == IFDIR || level < input_pathp) {
/*
* Set up current depth, remove current entry and
* continue recursion.
*/
for (i = 0; i <= fn->len; i++)
strcpy(stack_path[i], fn->fname[i]);
stack_pathp = fn->len;
if (!doing_find &&
(!recursive || (recursive && level <= input_pathp))) {
/*
* Remove current entry by moving others up.
*/
freemem(fn, 1);
fnn = fn;
for (fnnn = fnn, fnn++; fnn <= top; fnnn = fnn, fnn++) {
fnnn->ino = fnn->ino;
fnnn->len = fnn->len;
if (fnnn->len + 1 < FIRST_DEPTH) {
fnnn->fname = (char **)calloc(FIRST_DEPTH,
sizeof (char **));
fnnn->flag = 0;
} else if (fnnn->len < SECOND_DEPTH) {
fnnn->fname = (char **)calloc(SECOND_DEPTH,
sizeof (char **));
fnnn->flag = 1;
} else {
printf("maximum depth exceeded, ");
printf("try to cd lower\n");
error++;
return;
}
for (i = 0; i <= fnn->len; i++)
fnnn->fname[i] = fnn->fname[i];
}
if (fn == tos)
fn--;
top--;
bos--;
nfiles--;
}
follow_path(level + 1, cur_inum);
if (error)
return;
}
}
}
/*
* getname - break up the pathname entered by the user into components.
*/
getname()
{
register int i;
char c;
if ((c = getachar()) == '\n') {
ungetachar(c);
return;
}
ungetachar(c);
input_pathp++;
clear:
for (i = 0; i < MAXNAMLEN; i++)
input_path[input_pathp][i] = '\0';
for (;;) {
c = getachar();
if (c == '\\') {
if (strlen(input_path[input_pathp]) + 1 >= MAXNAMLEN) {
printf("maximum name length exceeded, ");
printf("truncating\n");
return;
}
input_path[input_pathp][strlen(input_path[input_pathp])] = c;
input_path[input_pathp][strlen(input_path[input_pathp])] =
getachar();
continue;
}
if (c == ' ' || c == '\n') {
ungetachar(c);
return;
}
if (!doing_find && c == '/') {
if (++input_pathp >= MAXPATHLEN) {
printf("maximum path length exceeded, ");
printf("truncating\n");
input_pathp--;
return;
}
goto clear;
}
if (strlen(input_path[input_pathp]) >= MAXNAMLEN) {
printf("maximum name length exceeded, truncating\n");
return;
}
input_path[input_pathp][strlen(input_path[input_pathp])] = c;
}
}
/*
* compare - check if a filename matches the pattern entered by the user.
* Handles '*', '?', and '[]'.
*/
compare(s1, s2, at_start)
char *s1, *s2;
short at_start;
{
register char c, *s;
s = s2;
while (c = *s1) {
if (c == '*') {
if (at_start && s == s2 && !letter(*s2) && !digit(*s2))
return(0);
if (*++s1 == 0)
return(1);
while (*s2) {
if (compare(s1, s2, 0))
return(1);
if (error)
return(0);
s2++;
}
}
if (*s2 == 0)
return(0);
if (c == '\\') {
s1++;
goto compare_chars;
}
if (c == '?') {
if (at_start && s == s2 && !letter(*s2) && !digit(*s2))
return(0);
s1++;
s2++;
continue;
}
if (c == '[') {
s1++;
if (*s2 >= *s1++) {
if (*s1++ != '-') {
printf("missing '-'\n");
error++;
return(0);
}
if (*s2 <= *s1++) {
if (*s1++ != ']') {
printf("missing ']'");
error++;
return(0);
}
s2++;
continue;
}
}
}
compare_chars:
if (*s1++ == *s2++)
continue;
else
return(0);
}
if (*s1 == *s2)
return(1);
return(0);
}
/*
* freemem - free the memory allocated to the filenames structure.
*/
freemem(p, numb)
struct filenames *p;
int numb;
{
register int i, j;
if (numb == 0)
return;
for (i = 0; i < numb; i++, p++) {
for (j = 0; j <= p->len; j++)
free(p->fname[j]);
free((char *)p->fname);
}
}
/*
* print_path - print the pathname held in p.
*/
print_path(p, pntr)
char *p[];
short pntr;
{
register int i;
printf("/");
if (pntr >= 0) {
for (i = 0; i < pntr; i++)
printf("%s/", p[i]);
printf("%s", p[pntr]);
}
}
/*
* fill - fill a section with a value or string.
* addr,count:fill=[value, "string"].
*/
fill()
{
register char *cptr;
register int i;
short eof_flag, end = 0, eof = 0;
long temp, tcount, taddr;
if (!wrtflag) {
printf("not opened for write '-w'\n");
error++;
return;
}
temp = expr();
if (error)
return;
if ((cptr = getblk(addr)) == 0)
return;
if (type == NUMB)
eof_flag = 0;
else
eof_flag = 1;
taddr = addr;
switch (objsz) {
case LONG:
addr &= ~(LONG - 1);
break;
case SHORT:
addr &= ~(SHORT - 1);
temp &= 0177777L;
break;
case CHAR:
temp &= 0377;
}
cur_bytes -= taddr - addr;
cptr += blkoff(fs, addr);
tcount = check_addr(eof_flag, &end, &eof, 0);
for (i = 0; i < tcount; i++) {
switch (objsz) {
case LONG:
*(long *)cptr = temp;
break;
case SHORT:
*(short *)cptr = temp;
break;
case CHAR:
*cptr = temp;
}
cptr += objsz;
}
addr += (tcount - 1) * objsz;
cur_bytes += (tcount - 1) * objsz;
put(temp, objsz);
if (eof) {
printf("end of file\n");
error++;
} else if (end) {
printf("end of block\n");
error++;
}
}
/*
* get - read a byte, short or long from the file system.
* The entire block containing the desired item is read
* and the appropriate data is extracted and returned.
*/
long
get(lngth)
short lngth;
{
register char *bptr;
long temp = addr;
objsz = lngth;
if (objsz == INODE || objsz == SHORT)
temp &= ~(SHORT - 1);
else if (objsz == DIRECTORY || objsz == LONG)
temp &= ~(LONG - 1);
if ((bptr = getblk(temp)) == 0)
return(-1);
bptr += blkoff(fs, temp);
switch (objsz) {
case CHAR:
return((long)*bptr);
case SHORT:
case INODE:
return((long)(*(short *)bptr));
case LONG:
case DIRECTORY:
return(*(long *)bptr);
}
return(0);
}
/*
* cgrp_check - make sure that we don't bump the cylinder group
* beyond the total number of cylinder groups or before the start.
*/
cgrp_check(cgrp)
long cgrp;
{
if (cgrp < 0) {
if (objsz == CGRP)
printf("beginning of cylinder groups\n");
else
printf("beginning of super blocks\n");
error++;
return(0);
}
if (cgrp >= fs->fs_ncg) {
if (objsz == CGRP)
printf("end of cylinder groups\n");
else
printf("end of super blocks\n");
error++;
return(0);
}
if (objsz == CGRP)
return(cgtod(fs, cgrp) << FRGSHIFT);
else
return(cgsblock(fs, cgrp) << FRGSHIFT);
}
/*
* icheck - make sure we can read the block containing the inode
* and determine the filesize (0 if inode not allocated). Return
* 0 if error otherwise return the mode.
*/
icheck(address)
long address;
{
register char *cptr;
register struct dinode *ip;
if ((cptr = getblk(address)) == 0)
return(0);
cptr += blkoff(fs, address);
ip = (struct dinode *)cptr;
if ((ip->di_mode & IFMT) == 0) {
if (!override) {
printf("inode not allocated\n");
error++;
return(0);
}
blocksize = filesize = 0;
} else {
trapped++;
filesize = ip->di_size;
blocksize = filesize * 2;
}
return(ip->di_mode);
}
/*
* getdirslot - get the address of the directory slot desired.
*/
getdirslot(slot)
short slot;
{
register char *cptr;
register struct direct *dirp;
register short i;
char *string = &scratch[0];
short bod = 0, mode, temp;
if (slot < 0) {
slot = 0;
bod++;
}
if (type != DIRECTORY) {
if (type == BLOCK)
string = "block";
else
string = "fragment";
addr = bod_addr;
if ((cptr = getblk(addr)) == 0)
return(0);
cptr += blkoff(fs, addr);
cur_bytes = 0;
dirp = (struct direct *)cptr;
for (dirslot = 0; dirslot < slot; dirslot++) {
dirp = (struct direct *)cptr;
if (blocksize > filesize) {
if (cur_bytes + dirp->d_reclen >= filesize) {
printf("end of file\n");
erraddr = addr;
errcur_bytes = cur_bytes;
stringsize = STRINGSIZE(dirp);
error++;
return(addr);
}
} else {
if (cur_bytes + dirp->d_reclen >= blocksize) {
printf("end of %s\n", string);
erraddr = addr;
errcur_bytes = cur_bytes;
stringsize = STRINGSIZE(dirp);
error++;
return(addr);
}
}
cptr += dirp->d_reclen;
addr += dirp->d_reclen;
cur_bytes += dirp->d_reclen;
}
if (bod) {
if (blocksize > filesize)
printf("beginning of file\n");
else
printf("beginning of %s\n", string);
erraddr = addr;
errcur_bytes = cur_bytes;
error++;
}
stringsize = STRINGSIZE(dirp);
return(addr);
} else {
addr = cur_ino;
if ((mode = icheck(addr)) == 0)
return(0);
if (!override && (mode & IFDIR) == 0) {
printf("inode is not a directory\n");
error++;
return(0);
}
temp = slot;
i = cur_bytes = 0;
for (;;) {
if (i == 0 || bcomp(addr)) {
error = 0;
if ((addr=(bmap(i++) << FRGSHIFT)) == 0)
break;
if ((cptr = getblk(addr)) == 0)
break;
cptr += blkoff(fs, addr);
}
dirp = (struct direct *)cptr;
value = dirp->d_ino;
if (!temp--)
break;
if (cur_bytes + dirp->d_reclen >= filesize) {
printf("end of file\n");
dirslot = slot - temp - 1;
objsz = DIRECTORY;
erraddr = addr;
errcur_bytes = cur_bytes;
stringsize = STRINGSIZE(dirp);
error++;
return(addr);
}
addr += dirp->d_reclen;
cptr += dirp->d_reclen;
cur_bytes += dirp->d_reclen;
}
dirslot = slot;
objsz = DIRECTORY;
if (bod) {
printf("beginning of file\n");
erraddr = addr;
errcur_bytes = cur_bytes;
error++;
}
stringsize = STRINGSIZE(dirp);
return(addr);
}
}
/*
* 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=='\\') {
printf("\\");
switch (c) {
case '\\':
printf("\\");
break;
case '\t':
printf("t");
break;
case '\n':
printf("n");
break;
case '\0':
printf("0");
break;
default:
printf("?");
}
}
else {
printf("%c", c);
printf(" ");
}
}
/*
* 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;
register long *vptr;
long s_err,nbytes;
long olditem;
if (!wrtflag) {
printf("not opened for write '-w'\n");
error++;
return;
}
objsz = lngth;
if ((sbptr = getblk(addr)) == 0)
return;
bptr = sbptr + blkoff(fs, addr);
switch (objsz) {
case LONG:
case DIRECTORY:
olditem = *(long *)bptr;
*(long *)bptr = item;
break;
case SHORT:
case INODE:
olditem = (long)*(short *)bptr;
item &= 0177777L;
*(short *)bptr = item;
break;
case CHAR:
olditem = (long)*bptr;
item &= 0377;
*bptr = lobyte(loword(item));
break;
default:
error++;
return;
}
if ((s_err = lseek(fd, addr & fs->fs_bmask, 0)) == -1) {
error++;
printf("seek error : %x\n",addr);
return(0);
}
if ((nbytes = write(fd, sbptr, BLKSIZE)) != BLKSIZE) {
error++;
printf("write error : addr = %x\n",addr);
printf(" : s_err = %x\n",s_err);
printf(" : nbytes = %x\n",nbytes);
return(0);
}
if (!acting_on_inode && objsz != INODE && objsz != DIRECTORY) {
index(base);
print(olditem, 8, -8, 0);
printf("\t=\t");
print(item, 8, -8, 0);
printf("\n");
} else {
if (objsz == DIRECTORY) {
addr = cur_dir;
fprnt('?', 'd');
} else {
addr = cur_ino;
objsz = INODE;
fprnt('?', 'i');
}
}
return;
}
/*
* 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 s_err, nbytes;
unsigned long block;
read_requests++;
block = lblkno(fs, address);
if (block >= fragstoblks(fs, fs->fs_size)) {
printf("block exceeds maximum block in file system\n");
error++;
return(0);
}
for (bp=bhdr.fwd; bp!= &bhdr; bp=bp->fwd)
if (bp->valid && bp->blkno==block)
goto xit;
actual_disk_reads++;
bp = bhdr.back;
bp->blkno = block;
bp->valid = 0;
if ((s_err = lseek(fd, address & fs->fs_bmask, 0)) == -1) {
error++;
printf("seek error : %x\n",address);
return(0);
}
if ((nbytes = read(fd, bp->blkaddr, BLKSIZE)) != BLKSIZE) {
error++;
printf("read error : addr = %x\n",address);
printf(" : s_err = %x\n",s_err);
printf(" : nbytes = %x\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;
}
/*
* err - called on interrupts. Set the current address
* back to the last address stored in erraddr. Reset all
* appropriate flags. A reset call is made to return
* to the main loop;
*/
err()
{
freemem(filenames, nfiles);
nfiles = 0;
signal(2,err);
addr = erraddr;
cur_ino = errino;
cur_inum = errinum;
cur_bytes = errcur_bytes;
error = 0;
c_count = 0;
printf("\n?\n");
fseek(stdin, 0L, 2);
longjmp(env,0);
}
/*
* 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 character 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);
}
/*
* 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.
*/
puta()
{
register char *cptr, c;
register int i;
char *sbptr;
short terror = 0;
long maxchars, s_err, nbytes, temp;
long taddr = addr, tcount = 0, item, olditem = 0;
if (!wrtflag) {
printf("not opened for write '-w'\n");
error++;
return;
}
if ((sbptr = getblk(addr)) == 0)
return;
cptr = sbptr + blkoff(fs, addr);
if (objsz == DIRECTORY) {
if (acting_on_directory)
maxchars = stringsize - 1;
else
maxchars = LONG;
} else if (objsz == INODE)
maxchars = objsz - (addr - cur_ino);
else
maxchars = min(blocksize - cur_bytes, filesize - cur_bytes);
while ((c = getachar()) != '"') {
if (tcount >= maxchars) {
printf("string too long\n");
if (objsz == DIRECTORY)
addr = cur_dir;
else if (acting_on_inode || objsz == INODE)
addr = cur_ino;
else
addr = taddr;
erraddr = addr;
errcur_bytes = cur_bytes;
terror++;
break;
}
tcount++;
if (c == '\n') {
ungetachar(c);
break;
}
temp = (long)*cptr;
olditem <<= BITSPERCHAR;
olditem += temp & 0xff;
if (c == '\\') {
switch (c = getachar()) {
case 't':
*cptr++ = '\t';
break;
case 'n':
*cptr++ = '\n';
break;
case '0':
*cptr++ = '\0';
break;
default:
*cptr++ = c;
break;
}
}
else
*cptr++ = c;
}
if (objsz == DIRECTORY && acting_on_directory)
for (i = tcount; i <= maxchars; i++)
*cptr++ = '\0';
if ((s_err = lseek(fd, addr & fs->fs_bmask, 0)) == -1) {
error++;
printf("seek error : %x\n",addr);
return(0);
}
if ((nbytes = write(fd, sbptr, BLKSIZE)) != BLKSIZE) {
error++;
printf("write error : addr = %x\n",addr);
printf(" : s_err = %x\n",s_err);
printf(" : nbytes = %x\n",nbytes);
return(0);
}
if (!acting_on_inode && objsz != INODE && objsz != DIRECTORY) {
addr += tcount;
cur_bytes += tcount;
taddr = addr;
if (objsz != CHAR) {
addr &= ~(objsz - 1);
cur_bytes -= taddr - addr;
}
if (addr == taddr) {
addr -= objsz;
taddr = addr;
}
tcount = LONG - (taddr - addr);
index(base);
if ((cptr = getblk(addr)) == 0)
return;
cptr += blkoff(fs, addr);
switch (objsz) {
case LONG:
item = *(long *)cptr;
if (tcount < LONG) {
olditem <<= tcount * BITSPERCHAR;
temp = 1;
for (i = 0; i < (tcount*BITSPERCHAR); i++)
temp <<= 1;
olditem += item & (temp - 1);
}
break;
case SHORT:
item = (long)*(short *)cptr;
if (tcount < SHORT) {
olditem <<= tcount * BITSPERCHAR;
temp = 1;
for (i = 0; i < (tcount * BITSPERCHAR); i++)
temp <<= 1;
olditem += item & (temp - 1);
}
olditem &= 0177777L;
break;
case CHAR:
item = (long)*cptr;
olditem &= 0377;
}
print(olditem, 8, -8, 0);
printf("\t=\t");
print(item, 8, -8, 0);
printf("\n");
} else {
if (objsz == DIRECTORY) {
addr = cur_dir;
fprnt('?', 'd');
} else {
addr = cur_ino;
objsz = INODE;
fprnt('?', 'i');
}
}
if (terror)
error++;
}
/*
* fprnt - print data. 'count' elements are printed where '*' will
* print an entire blocks worth or up to the eof, whichever
* occurs first. An error will occur if crossing a block boundary
* is attempted since consecutive blocks don't usually have
* meaning. Current print types:
* / b - print as bytes (base sensitive)
* c - print as characters
* o O - print as octal shorts (longs)
* d D - print as decimal shorts (longs)
* x X - print as hexadecimal shorts (longs)
* ? c - print as cylinder groups
* d - print as directories
* i - print as inodes
* s - print as super blocks
*/
fprnt(style, po)
register char style, po;
{
register int i;
register struct fs *sb;
register struct cg *cg;
register struct direct *dirp;
register struct dinode *ip;
int tbase;
char c, *cptr, *p;
long tinode, tcount, temp, taddr;
short offset, mode, end = 0, eof = 0, eof_flag;
unsigned short *sptr;
unsigned long *lptr;
laststyle = style;
lastpo = po;
should_print = 0;
if (count != 1) {
if (clear) {
count = 1;
star = 0;
clear = 0;
} else
clear = 1;
}
tcount = count;
offset = blkoff(fs, addr);
if (style == '/') {
if (type == NUMB)
eof_flag = 0;
else
eof_flag = 1;
switch (po) {
case 'c': /* print as characters */
case 'b': /* or bytes */
if ((cptr = getblk(addr)) == 0)
return;
cptr += offset;
objsz = CHAR;
tcount = check_addr(eof_flag, &end, &eof, 0);
if (tcount) {
for (i=0; tcount--; i++) {
if (i % 16 == 0) {
if (i)
printf("\n");
index(base);
}
if (po == 'c') {
putf(*cptr++);
if ((i + 1) % 16)
printf(" ");
} else {
if ((i + 1) % 16 == 0)
print(*cptr++ & 0377,
2,-2,0);
else
print(*cptr++ & 0377,
4,-2,0);
}
addr += CHAR;
cur_bytes += CHAR;
}
printf("\n");
}
addr -= CHAR;
erraddr = addr;
cur_bytes -= CHAR;
errcur_bytes = cur_bytes;
if (eof) {
printf("end of file\n");
error++;
} else if (end) {
if (type == BLOCK)
printf("end of block\n");
else
printf("end of fragment\n");
error++;
}
return;
case 'o': /* print as octal shorts */
tbase = OCTAL;
goto otx;
case 'd': /* print as decimal shorts */
tbase = DECIMAL;
goto otx;
case 'x': /* print as hex shorts */
tbase = HEX;
otx:
if ((cptr = getblk(addr)) == 0)
return;
taddr = addr;
addr &= ~(SHORT - 1);
cur_bytes -= taddr - addr;
cptr += blkoff(fs, addr);
sptr = (unsigned short *)cptr;
objsz = SHORT;
tcount = check_addr(eof_flag, &end, &eof, 0);
if (tcount) {
for (i=0; tcount--; i++) {
sptr = (unsigned short *)
print_check(sptr, &tcount, tbase, i);
switch (po) {
case 'o':
printf("%06o ",*sptr++);
break;
case 'd':
printf("%05d ",*sptr++);
break;
case 'x':
printf("%04x ",*sptr++);
}
addr += SHORT;
cur_bytes += SHORT;
}
printf("\n");
}
addr -= SHORT;
erraddr = addr;
cur_bytes -= SHORT;
errcur_bytes = cur_bytes;
if (eof) {
printf("end of file\n");
error++;
} else if (end) {
if (type == BLOCK)
printf("end of block\n");
else
printf("end of fragment\n");
error++;
}
return;
case 'O': /* print as octal longs */
tbase = OCTAL;
goto OTX;
case 'D': /* print as decimal longs */
tbase = DECIMAL;
goto OTX;
case 'X': /* print as hex longs */
tbase = HEX;
OTX:
if ((cptr = getblk(addr)) == 0)
return;
taddr = addr;
addr &= ~(LONG - 1);
cur_bytes -= taddr - addr;
cptr += blkoff(fs, addr);
lptr = (unsigned long *)cptr;
objsz = LONG;
tcount = check_addr(eof_flag, &end, &eof, 0);
if (tcount) {
for (i=0; tcount--; i++) {
lptr =
print_check(lptr, &tcount, tbase, i);
switch (po) {
case 'O':
printf("%011o ",*lptr++);
break;
case 'D':
printf("%010u ",*lptr++);
break;
case 'X':
printf("%08x ",*lptr++);
}
addr += LONG;
cur_bytes += LONG;
}
printf("\n");
}
addr -= LONG;
erraddr = addr;
cur_bytes -= LONG;
errcur_bytes = cur_bytes;
if (eof) {
printf("end of file\n");
error++;
} else if (end) {
if (type == BLOCK)
printf("end of block\n");
else
printf("end of fragment\n");
error++;
}
return;
default:
error++;
printf("no such print option\n");
return;
}
} else
switch (po) {
case 'c': /* print as cylinder group */
if (type != NUMB)
if (cur_cgrp + count > fs->fs_ncg) {
tcount = fs->fs_ncg - cur_cgrp;
if (!star)
end++;
}
addr &= ~(LONG - 1);
for (; tcount--;) {
erraddr = addr;
errcur_bytes = cur_bytes;
if (type != NUMB) {
addr = cgtod(fs, cur_cgrp)
<< FRGSHIFT;
cur_cgrp++;
}
if ((cptr = getblk(addr)) == 0) {
if (cur_cgrp)
cur_cgrp--;
return;
}
cptr += blkoff(fs, addr);
cg = (struct cg *)cptr;
if (type == NUMB) {
cur_cgrp = cg->cg_cgx + 1;
type = objsz = CGRP;
if (cur_cgrp + count - 1 > fs->fs_ncg) {
tcount = fs->fs_ncg - cur_cgrp;
if (!star)
end++;
}
}
if (!override && !cg_chkmagic(cg)) {
printf("invalid cylinder group ");
printf("magic word\n");
if (cur_cgrp)
cur_cgrp--;
error++;
return;
}
printcg(cg);
if (tcount)
printf("\n");
}
cur_cgrp--;
if (end) {
printf("end of cylinder groups\n");
error++;
}
return;
case 'd': /* print as directories */
if ((cptr = getblk(addr)) == 0)
return;
if (type == NUMB) {
if (fragoff(fs, addr)) {
printf("address must be at the ");
printf("beginning of a fragment\n");
error++;
return;
}
bod_addr = addr;
type = FRAGMENT;
dirslot = 0;
cur_bytes = 0;
blocksize = FRGSIZE;
filesize = FRGSIZE * 2;
}
cptr += offset;
objsz = DIRECTORY;
while (tcount-- && cur_bytes < filesize &&
cur_bytes < blocksize && !bcomp(addr)) {
dirp = (struct direct *)cptr;
tinode = dirp->d_ino;
printf("i#: ");
if (tinode == 0)
printf("free\t");
else
print(tinode, 12, -8, 0);
printf("%s\n",&dirp->d_name[0]);
erraddr = addr;
errcur_bytes = cur_bytes;
addr += dirp->d_reclen;
cptr += dirp->d_reclen;
cur_bytes += dirp->d_reclen;
dirslot++;
}
addr = erraddr;
cur_dir = addr;
cur_bytes = errcur_bytes;
stringsize = STRINGSIZE(dirp);
dirslot--;
if (tcount >= 0 && !star) {
switch (type) {
case FRAGMENT:
printf("end of fragment\n");
break;
case BLOCK:
printf("end of block\n");
break;
default:
printf("end of directory\n");
}
error++;
} else
error = 0;
return;
case 'i': /* print as inodes */
if ((ip = (struct dinode *)getblk(addr)) == 0)
return;
for (i=1; i < fs->fs_ncg; i++)
if (addr < (cgimin(fs,i) << FRGSHIFT))
break;
i--;
offset /= INODE;
temp = (addr - (cgimin(fs,i) << FRGSHIFT)) >> FRGSHIFT;
temp = (i * fs->fs_ipg) + fragstoblks(fs,temp) *
INOPB(fs) + offset;
if (count + offset > INOPB(fs)) {
tcount = INOPB(fs) - offset;
if (!star)
end++;
}
objsz = INODE;
ip += offset;
for (i=0; tcount--; ip++, temp++) {
if ((mode = icheck(addr)) == 0)
if (!override)
continue;
p = " ugtrwxrwxrwx";
switch (mode & IFMT) {
case IFDIR:
c = 'd';
break;
case IFCHR:
c = 'c';
break;
case IFBLK:
c = 'b';
break;
case IFREG:
c = '-';
break;
case IFLNK:
c = 'l';
break;
case IFSOCK:
c = 's';
break;
default:
c = '?';
if (!override)
goto empty;
}
printf("i#: ");
print(temp,12,-8,0);
printf(" md: ");
printf("%c", c);
for (mode = mode << 4; *++p; mode = mode << 1) {
if (mode & IFREG)
printf("%c", *p);
else
printf("-");
}
printf(" uid: ");
print(ip->di_uid,8,-4,0);
printf(" gid: ");
print(ip->di_gid,8,-4,0);
printf("\n");
printf("ln: ");
print(ip->di_nlink,8,-4,0);
printf(" bs: ");
print(ip->di_blocks,12,-8,0);
printf(" sz : ");
print(ip->di_size,12,-8,0);
printf("\n");
if (ip->di_mode & IFCHR) {
printf("maj: ");
print(ip->di_db[1] & 0377,4,-2,0);
printf(" min: ");
print(ip->di_db[0] & 0377,4,-2,0);
printf("\n");
} else {
for (i = 0; i < NDADDR; ) {
if (ip->di_db[i] == 0)
break;
printf("db#%x: ",i);
print(ip->di_db[i],11,-8,0);
if (++i % 4 == 0)
printf("\n");
else
printf(" ");
}
if (i % 4)
printf("\n");
for (i = 0; i < NIADDR; i++) {
if (ip->di_ib[i] == 0)
break;
printf("ib#%x: ",i);
print(ip->di_ib[i],11,-8,0);
printf(" ");
}
if (i)
printf("\n");
}
if (count == 1) {
printf("\taccessed: %s",
ctime(&ip->di_atime));
printf("\tmodified: %s",
ctime(&ip->di_mtime));
printf("\tcreated : %s",
ctime(&ip->di_ctime));
}
if (tcount)
printf("\n");
empty:
if (c == '?' && !override) {
printf("i#: ");
print(temp, 12, -8, 0);
printf(" is unallocated\n");
if (count != 1)
printf("\n");
}
cur_ino = erraddr = addr;
errcur_bytes = cur_bytes;
cur_inum++;
addr = addr + INODE;
}
addr = erraddr;
cur_bytes = errcur_bytes;
cur_inum--;
if (end) {
printf("end of block\n");
error++;
}
return;
case 's': /* print as super block */
if (cur_cgrp == -1) {
addr = SBLOCK * DEV_BSIZE;
type = NUMB;
}
addr &= ~(LONG - 1);
if (type != NUMB)
if (cur_cgrp + count > fs->fs_ncg) {
tcount = fs->fs_ncg - cur_cgrp;
if (!star)
end++;
}
for (; tcount--;) {
erraddr = addr;
cur_bytes = errcur_bytes;
if (type != NUMB) {
addr = cgsblock(fs, cur_cgrp)
<< FRGSHIFT;
cur_cgrp++;
}
if ((cptr = getblk(addr)) == 0) {
if (cur_cgrp)
cur_cgrp--;
return;
}
cptr += blkoff(fs, addr);
sb = (struct fs *)cptr;
if (type == NUMB) {
for (i = 0; i < fs->fs_ncg; i++)
if (addr == cgsblock(fs, i) <<
FRGSHIFT)
break;
if (i == fs->fs_ncg)
cur_cgrp = 0;
else
cur_cgrp = i + 1;
type = objsz = SB;
if (cur_cgrp + count - 1 > fs->fs_ncg) {
tcount = fs->fs_ncg - cur_cgrp;
if (!star)
end++;
}
}
if (sb->fs_magic != FS_MAGIC) {
cur_cgrp = 0;
if (!override) {
printf("invalid super block ");
printf("magic word\n");
cur_cgrp--;
error++;
return;
}
}
if (cur_cgrp == 0)
printf("\tsuper block:\n");
else {
printf("\tsuper block in cylinder ");
printf("group ");
print(cur_cgrp - 1, 0, 0, 0);
printf(":\n");
}
printsb(sb);
if (tcount)
printf("\n");
}
cur_cgrp--;
if (end) {
printf("end of super blocks\n");
error++;
}
return;
default:
error++;
printf("no such print option\n");
return;
}
}
/*
* valid_addr - call check_addr to validate the current address.
*/
valid_addr()
{
short eof_flag, end = 0, eof = 0;
long tcount = count;
if (!trapped)
return(1);
if (cur_bytes < 0) {
cur_bytes = 0;
if (blocksize > filesize) {
printf("beginning of file\n");
} else {
if (type == BLOCK)
printf("beginning of block\n");
else
printf("beginning of fragment\n");
}
error++;
return(0);
}
count = 1;
check_addr(1, &end, &eof, (filesize < blocksize));
count = tcount;
if (eof) {
printf("end of file\n");
error++;
return(0);
}
if (end == 2) {
if (erraddr > addr) {
if (type == BLOCK)
printf("beginning of block\n");
else
printf("beginning of fragment\n");
error++;
return(0);
}
}
if (end) {
if (type == BLOCK)
printf("end of block\n");
else
printf("end of fragment\n");
error++;
return(0);
}
return(1);
}
/*
* check_addr - check if the address crosses the end of block or
* end of file. Return the proper count.
*/
check_addr(eof_flag, end, eof, keep_on)
short eof_flag, *end, *eof, keep_on;
{
long temp, tcount = count, taddr = addr, tcur_bytes = cur_bytes;
if (bcomp(addr + count * objsz - 1) ||
(keep_on && taddr < (bmap(cur_block) << FRGSHIFT))) {
error = 0;
addr = taddr;
cur_bytes = tcur_bytes;
if (keep_on) {
if (addr < erraddr) {
if (cur_bytes < 0) {
(*end) = 2;
return;
}
temp = cur_block - lblkno(fs, cur_bytes);
cur_block -= temp;
if ((addr = bmap(cur_block) << FRGSHIFT) == 0) {
cur_block += temp;
return;
}
temp = tcur_bytes - cur_bytes;
addr += temp;
cur_bytes += temp;
return;
} else {
if (cur_bytes >= filesize) {
(*eof)++;
return;
}
temp = lblkno(fs, cur_bytes) - cur_block;
cur_block += temp;
if ((addr = bmap(cur_block) << FRGSHIFT) == 0) {
cur_block -= temp;
return;
}
temp = tcur_bytes - cur_bytes;
addr += temp;
cur_bytes += temp;
return;
}
}
tcount = (blkroundup(fs, addr+1)-addr) / objsz;
if (!star)
(*end) = 2;
}
addr = taddr;
cur_bytes = tcur_bytes;
if (eof_flag) {
if (blocksize > filesize) {
if (cur_bytes >= filesize) {
tcount = 0;
(*eof)++;
} else if (tcount > (filesize - cur_bytes) / objsz) {
tcount = (filesize - cur_bytes) / objsz;
if (!star || tcount == 0)
(*eof)++;
}
} else {
if (cur_bytes >= blocksize) {
tcount = 0;
(*end)++;
} else if (tcount > (blocksize - cur_bytes) / objsz) {
tcount = (blocksize - cur_bytes) / objsz;
if (!star || tcount == 0)
(*end)++;
}
}
}
return(tcount);
}
/*
* print_check - check if the index needs to be printed and delete
* rows of zeros from the output.
*/
unsigned long *
print_check(lptr, tcount, tbase, i)
unsigned long *lptr;
long *tcount;
short tbase;
register int i;
{
register int j, k, temp = BYTESPERLINE / objsz;
short first_time = 0;
unsigned long *tlptr;
unsigned short *tsptr, *sptr;
sptr = (unsigned short *)lptr;
if (i == 0)
first_time = 1;
if (i % temp == 0) {
if (*tcount >= temp - 1) {
if (objsz == SHORT)
tsptr = sptr;
else
tlptr = lptr;
k = *tcount - 1;
for (j = i; k--; j++)
if (objsz == SHORT) {
if (*tsptr++ != 0)
break;
} else {
if (*tlptr++ != 0)
break;
}
if (j > (i + temp - 1)) {
j = (j - i) / temp;
while (j-- > 0) {
if (objsz == SHORT)
sptr += temp;
else
lptr += temp;
*tcount -= temp;
i += temp;
addr += BYTESPERLINE;
cur_bytes += BYTESPERLINE;
}
if (first_time)
printf("*");
else
printf("\n*");
}
if (i)
printf("\n");
index(tbase);
} else {
if (i)
printf("\n");
index(tbase);
}
}
if(objsz == SHORT)
return((unsigned long *)sptr);
else
return(lptr);
}
/*
* index - print a byte index for the printout in base b
* with leading zeros.
*/
index(b)
int b;
{
int tbase = base;
base = b;
print(addr, 8, 8, 1);
printf(":\t");
base = tbase;
}
/*
* print - print out the value to digits places with/without
* leading zeros and right/left justified in the current base.
*/
print(value, fieldsz, digits, lead)
int value, fieldsz, digits, lead;
{
register int i, left = 0;
char mode = BASE[base - OCTAL];
char *string = &scratch[0];
if (digits < 0) {
left = 1;
digits *= -1;
}
if (base != HEX)
if (digits)
digits = digits + (digits - 1)/((base >> 1) - 1) + 1;
else
digits = 1;
if (lead) {
if (left)
sprintf(string, "%%%c%d%d.%d%c",
'-', 0, digits, lead, mode);
else
sprintf(string, "%%%d%d.%d%c", 0, digits, lead, mode);
} else {
if (left)
sprintf(string, "%%%c%d%c", '-', digits, mode);
else
sprintf(string, "%%%d%c", digits, mode);
}
printf(string, value);
for (i = 0; i < fieldsz - digits; i++)
printf(" ");
}
/*
* Print out the contents of a superblock.
*/
printsb(fs)
struct fs *fs;
{
int c, i, j, k, size;
if (fs->fs_postblformat == FS_42POSTBLFMT)
fs->fs_nrpos = 8;
printf("magic\t%x\tformat\t%s\ttime\t%s", fs->fs_magic,
fs->fs_postblformat == FS_42POSTBLFMT ? "static" : "dynamic",
ctime(&fs->fs_time));
printf("nbfree\t%d\tndir\t%d\tnifree\t%d\tnffree\t%d\n",
fs->fs_cstotal.cs_nbfree, fs->fs_cstotal.cs_ndir,
fs->fs_cstotal.cs_nifree, fs->fs_cstotal.cs_nffree);
printf("ncg\t%d\tncyl\t%d\tsize\t%d\tblocks\t%d\n",
fs->fs_ncg, fs->fs_ncyl, fs->fs_size, fs->fs_dsize);
printf("bsize\t%d\tshift\t%d\tmask\t0x%08x\n",
fs->fs_bsize, fs->fs_bshift, fs->fs_bmask);
printf("fsize\t%d\tshift\t%d\tmask\t0x%08x\n",
fs->fs_fsize, fs->fs_fshift, fs->fs_fmask);
printf("frag\t%d\tshift\t%d\tfsbtodb\t%d\n",
fs->fs_frag, fs->fs_fragshift, fs->fs_fsbtodb);
printf("cpg\t%d\tbpg\t%d\tfpg\t%d\tipg\t%d\n",
fs->fs_cpg, fs->fs_fpg / fs->fs_frag, fs->fs_fpg, fs->fs_ipg);
printf("minfree\t%d%%\toptim\t%s\tmaxcontig %d\tmaxbpg\t%d\n",
fs->fs_minfree, fs->fs_optim == FS_OPTSPACE ? "space" : "time",
fs->fs_maxcontig, fs->fs_maxbpg);
printf("rotdelay %dms\theadswitch %dus\ttrackseek %dus\trps\t%d\n",
fs->fs_rotdelay, fs->fs_headswitch, fs->fs_trkseek, fs->fs_rps);
printf("ntrak\t%d\tnsect\t%d\tnpsect\t%d\tspc\t%d\n",
fs->fs_ntrak, fs->fs_nsect, fs->fs_npsect, fs->fs_spc);
printf("trackskew %d\tinterleave %d\n",
fs->fs_trackskew, fs->fs_interleave);
printf("nindir\t%d\tinopb\t%d\tnspf\t%d\n",
fs->fs_nindir, fs->fs_inopb, fs->fs_nspf);
printf("sblkno\t%d\tcblkno\t%d\tiblkno\t%d\tdblkno\t%d\n",
fs->fs_sblkno, fs->fs_cblkno, fs->fs_iblkno, fs->fs_dblkno);
printf("sbsize\t%d\tcgsize\t%d\tcgoffset %d\tcgmask\t0x%08x\n",
fs->fs_sbsize, fs->fs_cgsize, fs->fs_cgoffset, fs->fs_cgmask);
printf("csaddr\t%d\tcssize\t%d\tshift\t%d\tmask\t0x%08x\n",
fs->fs_csaddr, fs->fs_cssize, fs->fs_csshift, fs->fs_csmask);
printf("cgrotor\t%d\tfmod\t%d\tronly\t%d\n",
fs->fs_cgrotor, fs->fs_fmod, fs->fs_ronly);
if (fs->fs_cpc != 0)
printf("blocks available in each of %d rotational positions",
fs->fs_nrpos);
else
printf("insufficient space to maintain rotational tables\n");
for (c = 0; c < fs->fs_cpc; c++) {
printf("\ncylinder number %d:", c);
for (i = 0; i < fs->fs_nrpos; i++) {
if (fs_postbl(fs, c)[i] == -1)
continue;
printf("\n position %d:\t", i);
for (j = fs_postbl(fs, c)[i], k = 1; ;
j += fs_rotbl(fs)[j], k++) {
printf("%5d", j);
if (k % 12 == 0)
printf("\n\t\t");
if (fs_rotbl(fs)[j] == 0)
break;
}
}
}
printf("\ncs[].cs_(nbfree,ndir,nifree,nffree):\n\t");
for (i = 0, j = 0; i < fs->fs_cssize; i += fs->fs_bsize, j++) {
size = fs->fs_cssize - i < fs->fs_bsize ?
fs->fs_cssize - i : fs->fs_bsize;
fs->fs_csp[j] = (struct csum *)calloc(1, size);
lseek(fd, fsbtodb(fs, (fs->fs_csaddr + j * fs->fs_frag)) *
fs->fs_fsize / fsbtodb(fs, 1), 0);
if (read(fd, fs->fs_csp[j], size) != size) {
for (j--; j >= 0; j--)
free(fs->fs_csp[j]);
return;
}
}
for (i = 0; i < fs->fs_ncg; i++) {
struct csum *cs = &fs->fs_cs(fs, i);
if (i && i % 4 == 0)
printf("\n\t");
printf("(%d,%d,%d,%d) ",
cs->cs_nbfree, cs->cs_ndir, cs->cs_nifree, cs->cs_nffree);
}
for (j--; j >= 0; j--)
free(fs->fs_csp[j]);
printf("\n");
if (fs->fs_ncyl % fs->fs_cpg) {
printf("cylinders in last group %d\n",
i = fs->fs_ncyl % fs->fs_cpg);
printf("blocks in last group %d\n",
i * fs->fs_spc / NSPB(fs));
}
}
/*
* Print out the contents of a cylinder group.
*/
printcg(cg)
struct cg *cg;
{
int i,j;
printf("\ncg %d:\n", cg->cg_cgx);
printf("magic\t%x\ttell\t%x\ttime\t%s",
fs->fs_postblformat == FS_42POSTBLFMT ?
((struct ocg *)cg)->cg_magic : cg->cg_magic,
fsbtodb(fs, cgtod(fs, cg->cg_cgx)) * fs->fs_fsize / fsbtodb(fs, 1),
ctime(&cg->cg_time));
printf("cgx\t%d\tncyl\t%d\tniblk\t%d\tndblk\t%d\n",
cg->cg_cgx, cg->cg_ncyl, cg->cg_niblk, cg->cg_ndblk);
printf("nbfree\t%d\tndir\t%d\tnifree\t%d\tnffree\t%d\n",
cg->cg_cs.cs_nbfree, cg->cg_cs.cs_ndir,
cg->cg_cs.cs_nifree, cg->cg_cs.cs_nffree);
printf("rotor\t%d\tirotor\t%d\tfrotor\t%d\nfrsum",
cg->cg_rotor, cg->cg_irotor, cg->cg_frotor);
for (i = 1, j = 0; i < fs->fs_frag; i++) {
printf("\t%d", cg->cg_frsum[i]);
j += i * cg->cg_frsum[i];
}
printf("\nsum of frsum: %d\niused:\t", j);
pbits(cg_inosused(cg), fs->fs_ipg);
printf("free:\t");
pbits(cg_blksfree(cg), fs->fs_fpg);
printf("b:\n");
for (i = 0; i < fs->fs_cpg; i++) {
if (cg_blktot(cg)[i] == 0)
continue;
printf(" c%d:\t(%d)\t", i, cg_blktot(cg)[i]);
for (j = 0; j < fs->fs_nrpos; j++) {
if (fs->fs_cpc == 0 ||
fs_postbl(fs, i % fs->fs_cpc)[j] == -1)
continue;
printf(" %d", cg_blks(fs, cg, i)[j]);
}
printf("\n");
}
}
/*
* Print out the contents of a bit array.
*/
pbits(cp, max)
register char *cp;
int max;
{
register int i;
int count = 0, j;
for (i = 0; i < max; i++)
if (isset(cp, i)) {
if (count)
printf(",%s", count % 6 ? " " : "\n\t");
count++;
printf("%d", i);
j = i;
while ((i+1)<max && isset(cp, i+1))
i++;
if (i != j)
printf("-%d", i);
}
printf("\n");
}
/*
* bcomp - used to check for block over/under flows when stepping through
* a file system.
*/
bcomp(addr)
long addr;
{
if (override)
return(0);
if (lblkno(fs, addr) == (bhdr.fwd)->blkno)
return(0);
error++;
return(1);
}
/*
* bmap - maps the logical block number of a file into
* the corresponding physical block on the file
* system.
*/
long
bmap(bn)
long bn;
{
register int i, j;
register struct dinode *ip;
int sh;
long nb;
ip = (struct dinode *)cur_ino;
if (bn < NDADDR) {
addr = (long)&ip->di_db[bn];
cur_bytes = bn * BLKSIZE;
return(nullblk(nb=get(LONG)) ? 0L : nb);
}
sh = 1;
bn -= NDADDR;
for (j = NIADDR; j > 0; j--) {
sh *= NINDIR(fs);
if (bn < sh)
break;
bn -= sh;
}
if (j == 0) {
printf("file too big\n");
error++;
return(0L);
}
addr = (long)&ip->di_ib[NIADDR - j];
nb = get(LONG);
if (nb == 0)
return(0L);
for (; j <= NIADDR; j++) {
sh /= NINDIR(fs);
addr = (nb << FRGSHIFT) + ((bn / sh) % NINDIR(fs)) * LONG;
if (nullblk(nb = get(LONG)))
return(0L);
}
return(nb);
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.