ref: 6ff5c10ffb06d10eee06f1d432f9cc4738496c07
dir: /sys/src/cmd/dd.c/
#include <u.h>
#include <libc.h>
#define BIG ((1UL<<31)-1)
#define VBIG ((1ULL<<63)-1)
#define LCASE (1<<0)
#define UCASE (1<<1)
#define SWAB (1<<2)
#define NERR (1<<3)
#define SYNC (1<<4)
int cflag;
int fflag;
char *string;
char *ifile;
char *ofile;
char *ibuf;
char *obuf;
vlong skip;
vlong oseekn;
vlong iseekn;
vlong count;
long files = 1;
long ibs = 512;
long obs = 512;
long bs;
long cbs;
long ibc;
long obc;
long cbc;
long nifr;
long nipr;
long nofr;
long nopr;
long ntrunc;
int dotrunc = 1;
int ibf;
int obf;
char *op;
int nspace;
uchar etoa[256];
uchar atoe[256];
uchar atoibm[256];
int quiet;
void flsh(void);
int match(char *s);
vlong number(vlong big);
void cnull(int cc);
void null(int c);
void ascii(int cc);
void unblock(int cc);
void ebcdic(int cc);
void ibm(int cc);
void block(int cc);
void term(char*);
void stats(void);
#define iskey(s) ((key[0] == '-') && (strcmp(key+1, s) == 0))
int
main(int argc, char *argv[])
{
void (*conv)(int);
char *ip;
char *key;
int a, c;
conv = null;
for(c=1; c<argc; c++) {
key = argv[c++];
if(c >= argc){
fprint(2, "dd: arg %s needs a value\n", key);
exits("arg");
}
string = argv[c];
if(iskey("ibs")) {
ibs = number(BIG);
continue;
}
if(iskey("obs")) {
obs = number(BIG);
continue;
}
if(iskey("cbs")) {
cbs = number(BIG);
continue;
}
if(iskey("bs")) {
bs = number(BIG);
continue;
}
if(iskey("if")) {
ifile = string;
continue;
}
if(iskey("of")) {
ofile = string;
continue;
}
if(iskey("trunc")) {
dotrunc = number(BIG);
continue;
}
if(iskey("quiet")) {
quiet = number(BIG);
continue;
}
if(iskey("skip")) {
skip = number(VBIG);
continue;
}
if(iskey("seek") || iskey("oseek")) {
oseekn = number(VBIG);
continue;
}
if(iskey("iseek")) {
iseekn = number(VBIG);
continue;
}
if(iskey("count")) {
count = number(VBIG);
continue;
}
if(iskey("files")) {
files = number(BIG);
continue;
}
if(iskey("conv")) {
cloop:
if(match(","))
goto cloop;
if(*string == '\0')
continue;
if(match("ebcdic")) {
conv = ebcdic;
goto cloop;
}
if(match("ibm")) {
conv = ibm;
goto cloop;
}
if(match("ascii")) {
conv = ascii;
goto cloop;
}
if(match("block")) {
conv = block;
goto cloop;
}
if(match("unblock")) {
conv = unblock;
goto cloop;
}
if(match("lcase")) {
cflag |= LCASE;
goto cloop;
}
if(match("ucase")) {
cflag |= UCASE;
goto cloop;
}
if(match("swab")) {
cflag |= SWAB;
goto cloop;
}
if(match("noerror")) {
cflag |= NERR;
goto cloop;
}
if(match("sync")) {
cflag |= SYNC;
goto cloop;
}
fprint(2, "dd: bad conv %s\n", argv[c]);
exits("arg");
}
fprint(2, "dd: bad arg: %s\n", key);
exits("arg");
}
if(conv == null && cflag&(LCASE|UCASE))
conv = cnull;
if(ifile)
ibf = open(ifile, 0);
else
ibf = dup(0, -1);
if(ibf < 0) {
fprint(2, "dd: open %s: %r\n", ifile);
exits("open");
}
if(ofile){
if(dotrunc)
obf = create(ofile, 1, 0664);
else
obf = open(ofile, 1);
if(obf < 0) {
fprint(2, "dd: create %s: %r\n", ofile);
exits("create");
}
}else{
obf = dup(1, -1);
if(obf < 0) {
fprint(2, "dd: can't dup file descriptor: %s: %r\n", ofile);
exits("dup");
}
}
if(bs)
ibs = obs = bs;
if(ibs == obs && conv == null)
fflag++;
if(ibs == 0 || obs == 0) {
fprint(2, "dd: counts: cannot be zero\n");
exits("counts");
}
ibuf = sbrk(ibs);
if(fflag)
obuf = ibuf;
else
obuf = sbrk(obs);
sbrk(64); /* For good measure */
if(ibuf == (char *)-1 || obuf == (char *)-1) {
fprint(2, "dd: not enough memory: %r\n");
exits("memory");
}
ibc = 0;
obc = 0;
cbc = 0;
op = obuf;
/*
if(signal(SIGINT, SIG_IGN) != SIG_IGN)
signal(SIGINT, term);
*/
seek(obf, obs*oseekn, 1);
seek(ibf, ibs*iseekn, 1);
while(skip) {
read(ibf, ibuf, ibs);
skip--;
}
ip = 0;
loop:
if(ibc-- == 0) {
ibc = 0;
if(count==0 || nifr+nipr!=count) {
if(cflag&(NERR|SYNC))
for(ip=ibuf+ibs; ip>ibuf;)
*--ip = 0;
ibc = read(ibf, ibuf, ibs);
}
if(ibc == -1) {
perror("read");
if((cflag&NERR) == 0) {
flsh();
term("errors");
}
ibc = 0;
for(c=0; c<ibs; c++)
if(ibuf[c] != 0)
ibc = c+1;
seek(ibf, ibs, 1);
stats();
}else if(ibc == 0 && --files<=0) {
flsh();
term(nil);
}
if(ibc != ibs) {
nipr++;
if(cflag&SYNC)
ibc = ibs;
} else
nifr++;
ip = ibuf;
c = (ibc>>1) & ~1;
if(cflag&SWAB && c)
do {
a = *ip++;
ip[-1] = *ip;
*ip++ = a;
} while(--c);
ip = ibuf;
if(fflag) {
obc = ibc;
flsh();
ibc = 0;
}
goto loop;
}
c = 0;
c |= *ip++;
c &= 0377;
(*conv)(c);
goto loop;
}
void
flsh(void)
{
int c;
if(obc) {
/* don't perror dregs of previous errors on a short write */
werrstr("");
c = write(obf, obuf, obc);
if(c != obc) {
if(c > 0)
++nopr;
perror("write");
term("errors");
}
if(obc == obs)
nofr++;
else
nopr++;
obc = 0;
}
}
int
match(char *s)
{
char *cs;
cs = string;
while(*cs++ == *s)
if(*s++ == '\0')
goto true;
if(*s != '\0')
return 0;
true:
cs--;
string = cs;
return 1;
}
vlong
number(vlong big)
{
char *cs;
uvlong n;
cs = string;
n = 0;
while(*cs >= '0' && *cs <= '9')
n = n*10 + *cs++ - '0';
for(;;)
switch(*cs++) {
case 'k':
n *= 1024;
continue;
case 'b':
n *= 512;
continue;
/* case '*':*/
case 'x':
string = cs;
n *= number(VBIG);
case '\0':
if(n > big) {
fprint(2, "dd: argument %llud out of range\n", n);
exits("range");
}
return n;
}
/* never gets here */
}
void
cnull(int cc)
{
int c;
c = cc;
if((cflag&UCASE) && c>='a' && c<='z')
c += 'A'-'a';
if((cflag&LCASE) && c>='A' && c<='Z')
c += 'a'-'A';
null(c);
}
void
null(int c)
{
*op = c;
op++;
if(++obc >= obs) {
flsh();
op = obuf;
}
}
void
ascii(int cc)
{
int c;
c = etoa[cc];
if(cbs == 0) {
cnull(c);
return;
}
if(c == ' ') {
nspace++;
goto out;
}
while(nspace > 0) {
null(' ');
nspace--;
}
cnull(c);
out:
if(++cbc >= cbs) {
null('\n');
cbc = 0;
nspace = 0;
}
}
void
unblock(int cc)
{
int c;
c = cc & 0377;
if(cbs == 0) {
cnull(c);
return;
}
if(c == ' ') {
nspace++;
goto out;
}
while(nspace > 0) {
null(' ');
nspace--;
}
cnull(c);
out:
if(++cbc >= cbs) {
null('\n');
cbc = 0;
nspace = 0;
}
}
void
ebcdic(int cc)
{
int c;
c = cc;
if(cflag&UCASE && c>='a' && c<='z')
c += 'A'-'a';
if(cflag&LCASE && c>='A' && c<='Z')
c += 'a'-'A';
c = atoe[c];
if(cbs == 0) {
null(c);
return;
}
if(cc == '\n') {
while(cbc < cbs) {
null(atoe[' ']);
cbc++;
}
cbc = 0;
return;
}
if(cbc == cbs)
ntrunc++;
cbc++;
if(cbc <= cbs)
null(c);
}
void
ibm(int cc)
{
int c;
c = cc;
if(cflag&UCASE && c>='a' && c<='z')
c += 'A'-'a';
if(cflag&LCASE && c>='A' && c<='Z')
c += 'a'-'A';
c = atoibm[c] & 0377;
if(cbs == 0) {
null(c);
return;
}
if(cc == '\n') {
while(cbc < cbs) {
null(atoibm[' ']);
cbc++;
}
cbc = 0;
return;
}
if(cbc == cbs)
ntrunc++;
cbc++;
if(cbc <= cbs)
null(c);
}
void
block(int cc)
{
int c;
c = cc;
if(cflag&UCASE && c>='a' && c<='z')
c += 'A'-'a';
if(cflag&LCASE && c>='A' && c<='Z')
c += 'a'-'A';
c &= 0377;
if(cbs == 0) {
null(c);
return;
}
if(cc == '\n') {
while(cbc < cbs) {
null(' ');
cbc++;
}
cbc = 0;
return;
}
if(cbc == cbs)
ntrunc++;
cbc++;
if(cbc <= cbs)
null(c);
}
void
term(char *status)
{
stats();
exits(status);
}
void
stats(void)
{
if(quiet)
return;
fprint(2, "%lud+%lud records in\n", nifr, nipr);
fprint(2, "%lud+%lud records out\n", nofr, nopr);
if(ntrunc)
fprint(2, "%lud truncated records\n", ntrunc);
}
uchar etoa[] =
{
0000,0001,0002,0003,0234,0011,0206,0177,
0227,0215,0216,0013,0014,0015,0016,0017,
0020,0021,0022,0023,0235,0205,0010,0207,
0030,0031,0222,0217,0034,0035,0036,0037,
0200,0201,0202,0203,0204,0012,0027,0033,
0210,0211,0212,0213,0214,0005,0006,0007,
0220,0221,0026,0223,0224,0225,0226,0004,
0230,0231,0232,0233,0024,0025,0236,0032,
0040,0240,0241,0242,0243,0244,0245,0246,
0247,0250,0133,0056,0074,0050,0053,0041,
0046,0251,0252,0253,0254,0255,0256,0257,
0260,0261,0135,0044,0052,0051,0073,0136,
0055,0057,0262,0263,0264,0265,0266,0267,
0270,0271,0174,0054,0045,0137,0076,0077,
0272,0273,0274,0275,0276,0277,0300,0301,
0302,0140,0072,0043,0100,0047,0075,0042,
0303,0141,0142,0143,0144,0145,0146,0147,
0150,0151,0304,0305,0306,0307,0310,0311,
0312,0152,0153,0154,0155,0156,0157,0160,
0161,0162,0313,0314,0315,0316,0317,0320,
0321,0176,0163,0164,0165,0166,0167,0170,
0171,0172,0322,0323,0324,0325,0326,0327,
0330,0331,0332,0333,0334,0335,0336,0337,
0340,0341,0342,0343,0344,0345,0346,0347,
0173,0101,0102,0103,0104,0105,0106,0107,
0110,0111,0350,0351,0352,0353,0354,0355,
0175,0112,0113,0114,0115,0116,0117,0120,
0121,0122,0356,0357,0360,0361,0362,0363,
0134,0237,0123,0124,0125,0126,0127,0130,
0131,0132,0364,0365,0366,0367,0370,0371,
0060,0061,0062,0063,0064,0065,0066,0067,
0070,0071,0372,0373,0374,0375,0376,0377,
};
uchar atoe[] =
{
0000,0001,0002,0003,0067,0055,0056,0057,
0026,0005,0045,0013,0014,0015,0016,0017,
0020,0021,0022,0023,0074,0075,0062,0046,
0030,0031,0077,0047,0034,0035,0036,0037,
0100,0117,0177,0173,0133,0154,0120,0175,
0115,0135,0134,0116,0153,0140,0113,0141,
0360,0361,0362,0363,0364,0365,0366,0367,
0370,0371,0172,0136,0114,0176,0156,0157,
0174,0301,0302,0303,0304,0305,0306,0307,
0310,0311,0321,0322,0323,0324,0325,0326,
0327,0330,0331,0342,0343,0344,0345,0346,
0347,0350,0351,0112,0340,0132,0137,0155,
0171,0201,0202,0203,0204,0205,0206,0207,
0210,0211,0221,0222,0223,0224,0225,0226,
0227,0230,0231,0242,0243,0244,0245,0246,
0247,0250,0251,0300,0152,0320,0241,0007,
0040,0041,0042,0043,0044,0025,0006,0027,
0050,0051,0052,0053,0054,0011,0012,0033,
0060,0061,0032,0063,0064,0065,0066,0010,
0070,0071,0072,0073,0004,0024,0076,0341,
0101,0102,0103,0104,0105,0106,0107,0110,
0111,0121,0122,0123,0124,0125,0126,0127,
0130,0131,0142,0143,0144,0145,0146,0147,
0150,0151,0160,0161,0162,0163,0164,0165,
0166,0167,0170,0200,0212,0213,0214,0215,
0216,0217,0220,0232,0233,0234,0235,0236,
0237,0240,0252,0253,0254,0255,0256,0257,
0260,0261,0262,0263,0264,0265,0266,0267,
0270,0271,0272,0273,0274,0275,0276,0277,
0312,0313,0314,0315,0316,0317,0332,0333,
0334,0335,0336,0337,0352,0353,0354,0355,
0356,0357,0372,0373,0374,0375,0376,0377,
};
uchar atoibm[] =
{
0000,0001,0002,0003,0067,0055,0056,0057,
0026,0005,0045,0013,0014,0015,0016,0017,
0020,0021,0022,0023,0074,0075,0062,0046,
0030,0031,0077,0047,0034,0035,0036,0037,
0100,0132,0177,0173,0133,0154,0120,0175,
0115,0135,0134,0116,0153,0140,0113,0141,
0360,0361,0362,0363,0364,0365,0366,0367,
0370,0371,0172,0136,0114,0176,0156,0157,
0174,0301,0302,0303,0304,0305,0306,0307,
0310,0311,0321,0322,0323,0324,0325,0326,
0327,0330,0331,0342,0343,0344,0345,0346,
0347,0350,0351,0255,0340,0275,0137,0155,
0171,0201,0202,0203,0204,0205,0206,0207,
0210,0211,0221,0222,0223,0224,0225,0226,
0227,0230,0231,0242,0243,0244,0245,0246,
0247,0250,0251,0300,0117,0320,0241,0007,
0040,0041,0042,0043,0044,0025,0006,0027,
0050,0051,0052,0053,0054,0011,0012,0033,
0060,0061,0032,0063,0064,0065,0066,0010,
0070,0071,0072,0073,0004,0024,0076,0341,
0101,0102,0103,0104,0105,0106,0107,0110,
0111,0121,0122,0123,0124,0125,0126,0127,
0130,0131,0142,0143,0144,0145,0146,0147,
0150,0151,0160,0161,0162,0163,0164,0165,
0166,0167,0170,0200,0212,0213,0214,0215,
0216,0217,0220,0232,0233,0234,0235,0236,
0237,0240,0252,0253,0254,0255,0256,0257,
0260,0261,0262,0263,0264,0265,0266,0267,
0270,0271,0272,0273,0274,0275,0276,0277,
0312,0313,0314,0315,0316,0317,0332,0333,
0334,0335,0336,0337,0352,0353,0354,0355,
0356,0357,0372,0373,0374,0375,0376,0377,
};