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od.c
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C/C++ Source or Header
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1990-07-23
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5KB
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325 lines
/* od - octal dump Author: Andy Tanenbaum */
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
int bflag, cflag, dflag, oflag, xflag, hflag, linenr, width, state, ever;
int prevwds[8];
long off;
char buf[512], buffer[BUFSIZ];
int next;
int bytespresent;
char hexit();
main(argc, argv)
int argc;
char *argv[];
{
int k, flags;
long offset();
char *p;
/* Process flags */
setbuf(stdout, buffer);
flags = 0;
p = argv[1];
if (argc > 1 && *p == '-') {
/* Flags present. */
flags++;
p++;
while (*p) {
switch (*p) {
case 'b': bflag++; break;
case 'c': cflag++; break;
case 'd': dflag++; break;
case 'h': hflag++; break;
case 'o': oflag++; break;
case 'x': xflag++; break;
default: usage();
}
p++;
}
} else {
oflag = 1;
}
if ((bflag | cflag | dflag | oflag | xflag) == 0) oflag = 1;
k = (flags ? 2 : 1);
if (bflag | cflag) {
width = 8;
} else if (oflag) {
width = 7;
} else if (dflag) {
width = 6;
} else {
width = 5;
}
/* Process file name, if any. */
p = argv[k];
if (k < argc && *p != '+') {
/* Explicit file name given. */
close(0);
if (open(argv[k], O_RDONLY) != 0) {
std_err("od: cannot open ");
std_err(argv[k]);
std_err("\n");
exit(1);
}
k++;
}
/* Process offset, if any. */
if (k < argc) {
/* Offset present. */
off = offset(argc, argv, k);
off = (off / 16L) * 16L;
lseek(0, off, SEEK_SET);
}
dumpfile();
addrout(off);
printf("\n");
exit(0);
}
long offset(argc, argv, k)
int argc;
char *argv[];
int k;
{
int dot, radix;
char str[80], *p, c;
long val;
/* See if the offset is decimal. */
dot = 0;
p = argv[k];
while (*p)
if (*p++ == '.') dot = 1;
/* Convert offset to binary. */
radix = (dot ? 10 : 8);
val = 0;
p = argv[k];
if (*p == '+') p++;
while (*p != 0 && *p != '.') {
c = *p++;
if (c < '0' || c > '9') {
printf("Bad character in offset: %c\n", c);
exit(1);
}
val = radix * val + c - '0';
}
p = argv[k + 1];
if (k + 1 == argc - 1 && *p == 'b') val = 512L * val;
return(val);
}
dumpfile()
{
int k;
short *words;
while ((k = getwords(&words))) { /* 'k' is # bytes read */
if (k == 16 && same(words, prevwds) && ever == 1) {
if (state == 0) {
printf("*\n");
state = 1;
off += 16;
continue;
} else if (state == 1) {
off += 16;
continue;
}
}
addrout(off);
off += k;
state = 0;
ever = 1;
linenr = 1;
if (oflag) wdump(words, k, 8);
if (dflag) wdump(words, k, 10);
if (xflag) wdump(words, k, 16);
if (cflag) bdump(words, k, 'c');
if (bflag) bdump(words, k, 'b');
for (k = 0; k < 8; k++) prevwds[k] = words[k];
for (k = 0; k < 8; k++) words[k] = 0;
}
}
wdump(words, k, radix)
short *words;
int k, radix;
{
int i;
if (linenr++ != 1) printf(" ");
for (i = 0; i < (k + 1) / 2; i++) outword(words[i], radix);
printf("\n");
}
bdump(bytes, k, c)
char bytes[16];
int k;
char c;
{
int i;
if (linenr++ != 1) printf(" ");
for (i = 0; i < k; i++) byte(bytes[i] & 0377, c);
printf("\n");
}
byte(val, c)
int val;
char c;
{
if (c == 'b') {
printf(" ");
outnum(val, 7);
return;
}
if (val == 0)
printf(" \\0");
else if (val == '\b')
printf(" \\b");
else if (val == '\f')
printf(" \\f");
else if (val == '\n')
printf(" \\n");
else if (val == '\r')
printf(" \\r");
else if (val == '\t')
printf(" \\t");
else if (val >= ' ' && val < 0177)
printf(" %c", val);
else {
printf(" ");
outnum(val, 7);
}
}
int getwords(words)
short **words;
{
int count;
if (next >= bytespresent) {
bytespresent = read(0, buf, 512);
next = 0;
}
if (next >= bytespresent) return(0);
*words = (short *) &buf[next];
if (next + 16 <= bytespresent)
count = 16;
else
count = bytespresent - next;
next += count;
return(count);
}
int same(w1, w2)
short *w1;
int *w2;
{
int i;
i = 8;
while (i--)
if (*w1++ != *w2++) return(0);
return(1);
}
outword(val, radix)
int val, radix;
{
/* Output 'val' in 'radix' in a field of total size 'width'. */
int i;
if (radix == 16) i = width - 4;
if (radix == 10) i = width - 5;
if (radix == 8) i = width - 6;
if (i == 1)
printf(" ");
else if (i == 2)
printf(" ");
else if (i == 3)
printf(" ");
else if (i == 4)
printf(" ");
outnum(val, radix);
}
outnum(num, radix)
int num, radix;
{
/* Output a number with all leading 0s present. Octal is 6 places,
* decimal is 5 places, hex is 4 places.
*/
int d, i;
unsigned val;
char s[8];
val = (unsigned) num;
if (radix == 8)
d = 6;
else if (radix == 10)
d = 5;
else if (radix == 16)
d = 4;
else if (radix == 7) {
d = 3;
radix = 8;
}
for (i = 0; i < d; i++) {
s[i] = val % radix;
val -= s[i];
val = val / radix;
}
for (i = d - 1; i >= 0; i--) {
if (s[i] > 9)
printf("%c", 'a' + s[i] - 10);
else
printf("%c", s[i] + '0');
}
}
addrout(l)
long l;
{
int i;
if (hflag == 0) {
for (i = 0; i < 7; i++)
printf("%c", (int) ((l >> (18 - 3 * i)) & 07) + '0');
} else {
for (i = 0; i < 7; i++)
printf("%c", hexit((int) ((l >> (24 - 4 * i)) & 0x0F)));
}
}
char hexit(k)
int k;
{
if (k <= 9)
return('0' + k);
else
return('A' + k - 10);
}
usage()
{
std_err("Usage: od [-bcdhox] [file] [ [+] offset [.] [b] ]");
}