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avorobey/ed.c

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V7 Unix ed.c modified to build on modern systems
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ed.c
/* Adapted from https://github.com/v7unix/v7unix/blob/master/v7/usr/src/cmd/ed.c with slight fixes. */
/*
* Editor
*/
#include <signal.h>
#include <sgtty.h>
#include <setjmp.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#define FNSIZE 64
#define LBSIZE 512
#define ESIZE 128
#define GBSIZE 256
#define NBRA 5
#define EOF -1
#define KSIZE 9
#define CBRA 1
#define CCHR 2
#define CDOT 4
#define CCL 6
#define NCCL 8
#define CDOL 10
#undef CEOF
#define CEOF 11
#define CKET 12
#define CBACK 14
#define STAR 01
char Q[] = "";
char T[] = "TMP";
#define READ 0
#define WRITE 1
int peekc;
int lastc;
char savedfile[FNSIZE];
char file[FNSIZE];
char linebuf[LBSIZE];
char rhsbuf[LBSIZE/2];
char expbuf[ESIZE+4];
int circfl;
int *zero;
int *dot;
int *dol;
int *addr1;
int *addr2;
char genbuf[LBSIZE];
long count;
char *nextip;
char *linebp;
int ninbuf;
int io;
int pflag;
void (*oldquit)(int);
void (*oldhup)(int);
int vflag = 1;
int xflag;
int xtflag;
int kflag;
char key[KSIZE + 1];
char crbuf[512];
char perm[768];
char tperm[768];
int listf;
int col;
char *globp;
int tfile = -1;
int tline;
char *tfname;
char *loc1;
char *loc2;
char *locs;
char ibuff[512];
int iblock = -1;
char obuff[512];
int oblock = -1;
int ichanged;
int nleft;
char WRERR[] = "WRITE ERROR";
int names[26];
int anymarks;
char *braslist[NBRA];
char *braelist[NBRA];
int nbra;
int subnewa;
int subolda;
int fchange;
int wrapp;
unsigned nlall = 128;
int *address();
char *getline();
char *getblock();
char *place();
jmp_buf savej;
char template[8] = "eXXXXXX";
void quit(int);
void onintr(int);
void onhup(int);
main(argc, argv)
char **argv;
{
register char *p1, *p2;
void (*oldintr)(int);
oldquit = signal(SIGQUIT, SIG_IGN);
oldhup = signal(SIGHUP, SIG_IGN);
oldintr = signal(SIGINT, SIG_IGN);
if (!signal(SIGTERM, SIG_IGN))
signal(SIGTERM, quit);
argv++;
while (argc > 1 && **argv=='-') {
switch((*argv)[1]) {
case '\0':
vflag = 0;
break;
case 'q':
signal(SIGQUIT, SIG_DFL);
vflag = 1;
break;
case 'x':
xflag = 1;
break;
}
argv++;
argc--;
}
if(xflag){
getkey();
kflag = crinit(key, perm);
}
if (argc>1) {
p1 = *argv;
p2 = savedfile;
while (*p2++ = *p1++)
;
globp = "r";
}
zero = (int *)malloc(nlall*sizeof(int));
tfname = mktemp(template);
init();
signal(SIGINT, onintr);
signal(SIGHUP, onhup);
setjmp(savej);
commands();
quit(0);
}
commands()
{
int getfile(), gettty();
register *a1, c;
for (;;) {
if (pflag) {
pflag = 0;
addr1 = addr2 = dot;
goto print;
}
addr1 = 0;
addr2 = 0;
do {
addr1 = addr2;
if ((a1 = address())==0) {
c = getchr();
break;
}
addr2 = a1;
if ((c=getchr()) == ';') {
c = ',';
dot = a1;
}
} while (c==',');
if (addr1==0)
addr1 = addr2;
switch(c) {
case 'a':
setdot();
newline();
append(gettty, addr2);
continue;
case 'c':
delete();
append(gettty, addr1-1);
continue;
case 'd':
delete();
continue;
case 'E':
fchange = 0;
c = 'e';
case 'e':
setnoaddr();
if (vflag && fchange) {
fchange = 0;
error(Q);
}
filename(c);
init();
addr2 = zero;
goto caseread;
case 'f':
setnoaddr();
filename(c);
edputs(savedfile);
continue;
case 'g':
global(1);
continue;
case 'i':
setdot();
nonzero();
newline();
append(gettty, addr2-1);
continue;
case 'j':
if (addr2==0) {
addr1 = dot;
addr2 = dot+1;
}
setdot();
newline();
nonzero();
join();
continue;
case 'k':
if ((c = getchr()) < 'a' || c > 'z')
error(Q);
newline();
setdot();
nonzero();
names[c-'a'] = *addr2 & ~01;
anymarks |= 01;
continue;
case 'm':
move(0);
continue;
case '\n':
if (addr2==0)
addr2 = dot+1;
addr1 = addr2;
goto print;
case 'l':
listf++;
case 'p':
case 'P':
newline();
print:
setdot();
nonzero();
a1 = addr1;
do {
edputs(getline(*a1++));
} while (a1 <= addr2);
dot = addr2;
listf = 0;
continue;
case 'Q':
fchange = 0;
case 'q':
setnoaddr();
newline();
quit(0);
case 'r':
filename(c);
caseread:
if ((io = open(file, 0)) < 0) {
lastc = '\n';
error(file);
}
setall();
ninbuf = 0;
c = zero != dol;
append(getfile, addr2);
exfile();
fchange = c;
continue;
case 's':
setdot();
nonzero();
substitute(globp!=0);
continue;
case 't':
move(1);
continue;
case 'u':
setdot();
nonzero();
newline();
if ((*addr2&~01) != subnewa)
error(Q);
*addr2 = subolda;
dot = addr2;
continue;
case 'v':
global(0);
continue;
case 'W':
wrapp++;
case 'w':
setall();
nonzero();
filename(c);
if(!wrapp ||
((io = open(file,1)) == -1) ||
((lseek(io, 0L, 2)) == -1))
if ((io = creat(file, 0666)) < 0)
error(file);
wrapp = 0;
putfile();
exfile();
if (addr1==zero+1 && addr2==dol)
fchange = 0;
continue;
case 'x':
setnoaddr();
newline();
xflag = 1;
edputs("Entering encrypting mode!");
getkey();
kflag = crinit(key, perm);
continue;
case '=':
setall();
newline();
count = (addr2-zero)&077777;
putd();
putchr('\n');
continue;
case '!':
callunix();
continue;
case EOF:
return;
}
error(Q);
}
}
int *
address()
{
register *a1, minus, c;
int n, relerr;
minus = 0;
a1 = 0;
for (;;) {
c = getchr();
if ('0'<=c && c<='9') {
n = 0;
do {
n *= 10;
n += c - '0';
} while ((c = getchr())>='0' && c<='9');
peekc = c;
if (a1==0)
a1 = zero;
if (minus<0)
n = -n;
a1 += n;
minus = 0;
continue;
}
relerr = 0;
if (a1 || minus)
relerr++;
switch(c) {
case ' ':
case '\t':
continue;
case '+':
minus++;
if (a1==0)
a1 = dot;
continue;
case '-':
case '^':
minus--;
if (a1==0)
a1 = dot;
continue;
case '?':
case '/':
compile(c);
a1 = dot;
for (;;) {
if (c=='/') {
a1++;
if (a1 > dol)
a1 = zero;
} else {
a1--;
if (a1 < zero)
a1 = dol;
}
if (execute(0, a1))
break;
if (a1==dot)
error(Q);
}
break;
case '$':
a1 = dol;
break;
case '.':
a1 = dot;
break;
case '\'':
if ((c = getchr()) < 'a' || c > 'z')
error(Q);
for (a1=zero; a1<=dol; a1++)
if (names[c-'a'] == (*a1 & ~01))
break;
break;
default:
peekc = c;
if (a1==0)
return(0);
a1 += minus;
if (a1<zero || a1>dol)
error(Q);
return(a1);
}
if (relerr)
error(Q);
}
}
setdot()
{
if (addr2 == 0)
addr1 = addr2 = dot;
if (addr1 > addr2)
error(Q);
}
setall()
{
if (addr2==0) {
addr1 = zero+1;
addr2 = dol;
if (dol==zero)
addr1 = zero;
}
setdot();
}
setnoaddr()
{
if (addr2)
error(Q);
}
nonzero()
{
if (addr1<=zero || addr2>dol)
error(Q);
}
newline()
{
register c;
if ((c = getchr()) == '\n')
return;
if (c=='p' || c=='l') {
pflag++;
if (c=='l')
listf++;
if (getchr() == '\n')
return;
}
error(Q);
}
filename(comm)
{
register char *p1, *p2;
register c;
count = 0;
c = getchr();
if (c=='\n' || c==EOF) {
p1 = savedfile;
if (*p1==0 && comm!='f')
error(Q);
p2 = file;
while (*p2++ = *p1++)
;
return;
}
if (c!=' ')
error(Q);
while ((c = getchr()) == ' ')
;
if (c=='\n')
error(Q);
p1 = file;
do {
*p1++ = c;
if (c==' ' || c==EOF)
error(Q);
} while ((c = getchr()) != '\n');
*p1++ = 0;
if (savedfile[0]==0 || comm=='e' || comm=='f') {
p1 = savedfile;
p2 = file;
while (*p1++ = *p2++)
;
}
}
exfile()
{
close(io);
io = -1;
if (vflag) {
putd();
putchr('\n');
}
}
void
onintr(int _x)
{
signal(SIGINT, onintr);
putchr('\n');
lastc = '\n';
error(Q);
}
void
onhup(int _x)
{
signal(SIGINT, SIG_IGN);
signal(SIGHUP, SIG_IGN);
if (dol > zero) {
addr1 = zero+1;
addr2 = dol;
io = creat("ed.hup", 0666);
if (io > 0)
putfile();
}
fchange = 0;
quit(0);
}
error(s)
char *s;
{
register c;
wrapp = 0;
listf = 0;
putchr('?');
edputs(s);
count = 0;
lseek(0, (long)0, 2);
pflag = 0;
if (globp)
lastc = '\n';
globp = 0;
peekc = lastc;
if(lastc)
while ((c = getchr()) != '\n' && c != EOF)
;
if (io > 0) {
close(io);
io = -1;
}
longjmp(savej, 1);
}
getchr()
{
char c;
if (lastc=peekc) {
peekc = 0;
return(lastc);
}
if (globp) {
if ((lastc = *globp++) != 0)
return(lastc);
globp = 0;
return(EOF);
}
if (read(0, &c, 1) <= 0)
return(lastc = EOF);
lastc = c&0177;
return(lastc);
}
gettty()
{
register c;
register char *gf;
register char *p;
p = linebuf;
gf = globp;
while ((c = getchr()) != '\n') {
if (c==EOF) {
if (gf)
peekc = c;
return(c);
}
if ((c &= 0177) == 0)
continue;
*p++ = c;
if (p >= &linebuf[LBSIZE-2])
error(Q);
}
*p++ = 0;
if (linebuf[0]=='.' && linebuf[1]==0)
return(EOF);
return(0);
}
getfile()
{
register c;
register char *lp, *fp;
lp = linebuf;
fp = nextip;
do {
if (--ninbuf < 0) {
if ((ninbuf = read(io, genbuf, LBSIZE)-1) < 0)
return(EOF);
fp = genbuf;
while(fp < &genbuf[ninbuf]) {
if (*fp++ & 0200) {
if (kflag)
crblock(perm, genbuf, ninbuf+1, count);
break;
}
}
fp = genbuf;
}
c = *fp++;
if (c=='\0')
continue;
if (c&0200 || lp >= &linebuf[LBSIZE]) {
lastc = '\n';
error(Q);
}
*lp++ = c;
count++;
} while (c != '\n');
*--lp = 0;
nextip = fp;
return(0);
}
putfile()
{
int *a1, n;
register char *fp, *lp;
register nib;
nib = 512;
fp = genbuf;
a1 = addr1;
do {
lp = getline(*a1++);
for (;;) {
if (--nib < 0) {
n = fp-genbuf;
if(kflag)
crblock(perm, genbuf, n, count-n);
if(write(io, genbuf, n) != n) {
edputs(WRERR);
error(Q);
}
nib = 511;
fp = genbuf;
}
count++;
if ((*fp++ = *lp++) == 0) {
fp[-1] = '\n';
break;
}
}
} while (a1 <= addr2);
n = fp-genbuf;
if(kflag)
crblock(perm, genbuf, n, count-n);
if(write(io, genbuf, n) != n) {
edputs(WRERR);
error(Q);
}
}
append(f, a)
int *a;
int (*f)();
{
register *a1, *a2, *rdot;
int nline, tl;
nline = 0;
dot = a;
while ((*f)() == 0) {
if ((dol-zero)+1 >= nlall) {
int *ozero = zero;
nlall += 512;
/* free((char *)zero); */
if ((zero = (int *)realloc((char *)zero, nlall*sizeof(int)))==NULL) {
lastc = '\n';
zero = ozero;
error("MEM?");
}
dot += zero - ozero;
dol += zero - ozero;
}
tl = putline();
nline++;
a1 = ++dol;
a2 = a1+1;
rdot = ++dot;
while (a1 > rdot)
*--a2 = *--a1;
*rdot = tl;
}
return(nline);
}
callunix()
{
register void (*savint)(int);
int pid, rpid;
int retcode;
setnoaddr();
if ((pid = fork()) == 0) {
signal(SIGHUP, oldhup);
signal(SIGQUIT, oldquit);
execl("/bin/sh", "sh", "-t", NULL);
exit(0100);
}
savint = signal(SIGINT, SIG_IGN);
while ((rpid = wait(&retcode)) != pid && rpid != -1)
;
signal(SIGINT, savint);
edputs("!");
}
void
quit(int _dummy)
{
if (vflag && fchange && dol!=zero) {
fchange = 0;
error(Q);
}
unlink(tfname);
exit(0);
}
delete()
{
setdot();
newline();
nonzero();
rdelete(addr1, addr2);
}
rdelete(ad1, ad2)
int *ad1, *ad2;
{
register *a1, *a2, *a3;
a1 = ad1;
a2 = ad2+1;
a3 = dol;
dol -= a2 - a1;
do {
*a1++ = *a2++;
} while (a2 <= a3);
a1 = ad1;
if (a1 > dol)
a1 = dol;
dot = a1;
fchange = 1;
}
gdelete()
{
register *a1, *a2, *a3;
a3 = dol;
for (a1=zero+1; (*a1&01)==0; a1++)
if (a1>=a3)
return;
for (a2=a1+1; a2<=a3;) {
if (*a2&01) {
a2++;
dot = a1;
} else
*a1++ = *a2++;
}
dol = a1-1;
if (dot>dol)
dot = dol;
fchange = 1;
}
char *
getline(tl)
{
register char *bp, *lp;
register nl;
lp = linebuf;
bp = getblock(tl, READ);
nl = nleft;
tl &= ~0377;
while (*lp++ = *bp++)
if (--nl == 0) {
bp = getblock(tl+=0400, READ);
nl = nleft;
}
return(linebuf);
}
putline()
{
register char *bp, *lp;
register nl;
int tl;
fchange = 1;
lp = linebuf;
tl = tline;
bp = getblock(tl, WRITE);
nl = nleft;
tl &= ~0377;
while (*bp = *lp++) {
if (*bp++ == '\n') {
*--bp = 0;
linebp = lp;
break;
}
if (--nl == 0) {
bp = getblock(tl+=0400, WRITE);
nl = nleft;
}
}
nl = tline;
tline += (((lp-linebuf)+03)>>1)&077776;
return(nl);
}
char *
getblock(atl, iof)
{
register bno, off;
register char *p1, *p2;
register int n;
bno = (atl>>8)&0377;
off = (atl<<1)&0774;
if (bno >= 255) {
lastc = '\n';
error(T);
}
nleft = 512 - off;
if (bno==iblock) {
ichanged |= iof;
return(ibuff+off);
}
if (bno==oblock)
return(obuff+off);
if (iof==READ) {
if (ichanged) {
if(xtflag)
crblock(tperm, ibuff, 512, (long)0);
blkio(iblock, ibuff, write);
}
ichanged = 0;
iblock = bno;
blkio(bno, ibuff, read);
if(xtflag)
crblock(tperm, ibuff, 512, (long)0);
return(ibuff+off);
}
if (oblock>=0) {
if(xtflag) {
p1 = obuff;
p2 = crbuf;
n = 512;
while(n--)
*p2++ = *p1++;
crblock(tperm, crbuf, 512, (long)0);
blkio(oblock, crbuf, write);
} else
blkio(oblock, obuff, write);
}
oblock = bno;
return(obuff+off);
}
blkio(b, buf, iofcn)
char *buf;
int (*iofcn)();
{
lseek(tfile, (long)b<<9, 0);
if ((*iofcn)(tfile, buf, 512) != 512) {
error(T);
}
}
init()
{
register *markp;
close(tfile);
tline = 2;
for (markp = names; markp < &names[26]; )
*markp++ = 0;
subnewa = 0;
anymarks = 0;
iblock = -1;
oblock = -1;
ichanged = 0;
close(creat(tfname, 0600));
tfile = open(tfname, 2);
if(xflag) {
xtflag = 1;
makekey(key, tperm);
}
dot = dol = zero;
}
global(k)
{
register char *gp;
register c;
register int *a1;
char globuf[GBSIZE];
if (globp)
error(Q);
setall();
nonzero();
if ((c=getchr())=='\n')
error(Q);
compile(c);
gp = globuf;
while ((c = getchr()) != '\n') {
if (c==EOF)
error(Q);
if (c=='\\') {
c = getchr();
if (c!='\n')
*gp++ = '\\';
}
*gp++ = c;
if (gp >= &globuf[GBSIZE-2])
error(Q);
}
*gp++ = '\n';
*gp++ = 0;
for (a1=zero; a1<=dol; a1++) {
*a1 &= ~01;
if (a1>=addr1 && a1<=addr2 && execute(0, a1)==k)
*a1 |= 01;
}
/*
* Special case: g/.../d (avoid n^2 algorithm)
*/
if (globuf[0]=='d' && globuf[1]=='\n' && globuf[2]=='\0') {
gdelete();
return;
}
for (a1=zero; a1<=dol; a1++) {
if (*a1 & 01) {
*a1 &= ~01;
dot = a1;
globp = globuf;
commands();
a1 = zero;
}
}
}
join()
{
register char *gp, *lp;
register *a1;
gp = genbuf;
for (a1=addr1; a1<=addr2; a1++) {
lp = getline(*a1);
while (*gp = *lp++)
if (gp++ >= &genbuf[LBSIZE-2])
error(Q);
}
lp = linebuf;
gp = genbuf;
while (*lp++ = *gp++)
;
*addr1 = putline();
if (addr1<addr2)
rdelete(addr1+1, addr2);
dot = addr1;
}
substitute(inglob)
{
register *markp, *a1, nl;
int gsubf;
int getsub();
gsubf = compsub();
for (a1 = addr1; a1 <= addr2; a1++) {
int *ozero;
if (execute(0, a1)==0)
continue;
inglob |= 01;
dosub();
if (gsubf) {
while (*loc2) {
if (execute(1, (int *)0)==0)
break;
dosub();
}
}
subnewa = putline();
*a1 &= ~01;
if (anymarks) {
for (markp = names; markp < &names[26]; markp++)
if (*markp == *a1)
*markp = subnewa;
}
subolda = *a1;
*a1 = subnewa;
ozero = zero;
nl = append(getsub, a1);
nl += zero-ozero;
a1 += nl;
addr2 += nl;
}
if (inglob==0)
error(Q);
}
compsub()
{
register seof, c;
register char *p;
if ((seof = getchr()) == '\n' || seof == ' ')
error(Q);
compile(seof);
p = rhsbuf;
for (;;) {
c = getchr();
if (c=='\\')
c = getchr() | 0200;
if (c=='\n') {
if (globp)
c |= 0200;
else
error(Q);
}
if (c==seof)
break;
*p++ = c;
if (p >= &rhsbuf[LBSIZE/2])
error(Q);
}
*p++ = 0;
if ((peekc = getchr()) == 'g') {
peekc = 0;
newline();
return(1);
}
newline();
return(0);
}
getsub()
{
register char *p1, *p2;
p1 = linebuf;
if ((p2 = linebp) == 0)
return(EOF);
while (*p1++ = *p2++)
;
linebp = 0;
return(0);
}
dosub()
{
register char *lp, *sp, *rp;
int c;
lp = linebuf;
sp = genbuf;
rp = rhsbuf;
while (lp < loc1)
*sp++ = *lp++;
while (c = *rp++&0377) {
if (c=='&') {
sp = place(sp, loc1, loc2);
continue;
} else if (c&0200 && (c &= 0177) >='1' && c < nbra+'1') {
sp = place(sp, braslist[c-'1'], braelist[c-'1']);
continue;
}
*sp++ = c&0177;
if (sp >= &genbuf[LBSIZE])
error(Q);
}
lp = loc2;
loc2 = sp - genbuf + linebuf;
while (*sp++ = *lp++)
if (sp >= &genbuf[LBSIZE])
error(Q);
lp = linebuf;
sp = genbuf;
while (*lp++ = *sp++)
;
}
char *
place(sp, l1, l2)
register char *sp, *l1, *l2;
{
while (l1 < l2) {
*sp++ = *l1++;
if (sp >= &genbuf[LBSIZE])
error(Q);
}
return(sp);
}
move(cflag)
{
register int *adt, *ad1, *ad2;
int getcopy();
setdot();
nonzero();
if ((adt = address())==0)
error(Q);
newline();
if (cflag) {
int *ozero, delta;
ad1 = dol;
ozero = zero;
append(getcopy, ad1++);
ad2 = dol;
delta = zero - ozero;
ad1 += delta;
adt += delta;
} else {
ad2 = addr2;
for (ad1 = addr1; ad1 <= ad2;)
*ad1++ &= ~01;
ad1 = addr1;
}
ad2++;
if (adt<ad1) {
dot = adt + (ad2-ad1);
if ((++adt)==ad1)
return;
reverse(adt, ad1);
reverse(ad1, ad2);
reverse(adt, ad2);
} else if (adt >= ad2) {
dot = adt++;
reverse(ad1, ad2);
reverse(ad2, adt);
reverse(ad1, adt);
} else
error(Q);
fchange = 1;
}
reverse(a1, a2)
register int *a1, *a2;
{
register int t;
for (;;) {
t = *--a2;
if (a2 <= a1)
return;
*a2 = *a1;
*a1++ = t;
}
}
getcopy()
{
if (addr1 > addr2)
return(EOF);
getline(*addr1++);
return(0);
}
compile(aeof)
{
register eof, c;
register char *ep;
char *lastep;
char bracket[NBRA], *bracketp;
int cclcnt;
ep = expbuf;
eof = aeof;
bracketp = bracket;
if ((c = getchr()) == eof) {
if (*ep==0)
error(Q);
return;
}
circfl = 0;
nbra = 0;
if (c=='^') {
c = getchr();
circfl++;
}
peekc = c;
lastep = 0;
for (;;) {
if (ep >= &expbuf[ESIZE])
goto cerror;
c = getchr();
if (c==eof) {
if (bracketp != bracket)
goto cerror;
*ep++ = CEOF;
return;
}
if (c!='*')
lastep = ep;
switch (c) {
case '\\':
if ((c = getchr())=='(') {
if (nbra >= NBRA)
goto cerror;
*bracketp++ = nbra;
*ep++ = CBRA;
*ep++ = nbra++;
continue;
}
if (c == ')') {
if (bracketp <= bracket)
goto cerror;
*ep++ = CKET;
*ep++ = *--bracketp;
continue;
}
if (c>='1' && c<'1'+NBRA) {
*ep++ = CBACK;
*ep++ = c-'1';
continue;
}
*ep++ = CCHR;
if (c=='\n')
goto cerror;
*ep++ = c;
continue;
case '.':
*ep++ = CDOT;
continue;
case '\n':
goto cerror;
case '*':
if (lastep==0 || *lastep==CBRA || *lastep==CKET)
goto defchar;
*lastep |= STAR;
continue;
case '$':
if ((peekc=getchr()) != eof)
goto defchar;
*ep++ = CDOL;
continue;
case '[':
*ep++ = CCL;
*ep++ = 0;
cclcnt = 1;
if ((c=getchr()) == '^') {
c = getchr();
ep[-2] = NCCL;
}
do {
if (c=='\n')
goto cerror;
if (c=='-' && ep[-1]!=0) {
if ((c=getchr())==']') {
*ep++ = '-';
cclcnt++;
break;
}
while (ep[-1]<c) {
*ep = ep[-1]+1;
ep++;
cclcnt++;
if (ep>=&expbuf[ESIZE])
goto cerror;
}
}
*ep++ = c;
cclcnt++;
if (ep >= &expbuf[ESIZE])
goto cerror;
} while ((c = getchr()) != ']');
lastep[1] = cclcnt;
continue;
defchar:
default:
*ep++ = CCHR;
*ep++ = c;
}
}
cerror:
expbuf[0] = 0;
nbra = 0;
error(Q);
}
execute(gf, addr)
int *addr;
{
register char *p1, *p2, c;
for (c=0; c<NBRA; c++) {
braslist[c] = 0;
braelist[c] = 0;
}
if (gf) {
if (circfl)
return(0);
p1 = linebuf;
p2 = genbuf;
while (*p1++ = *p2++)
;
locs = p1 = loc2;
} else {
if (addr==zero)
return(0);
p1 = getline(*addr);
locs = 0;
}
p2 = expbuf;
if (circfl) {
loc1 = p1;
return(advance(p1, p2));
}
/* fast check for first character */
if (*p2==CCHR) {
c = p2[1];
do {
if (*p1!=c)
continue;
if (advance(p1, p2)) {
loc1 = p1;
return(1);
}
} while (*p1++);
return(0);
}
/* regular algorithm */
do {
if (advance(p1, p2)) {
loc1 = p1;
return(1);
}
} while (*p1++);
return(0);
}
advance(lp, ep)
register char *ep, *lp;
{
register char *curlp;
int i;
for (;;) switch (*ep++) {
case CCHR:
if (*ep++ == *lp++)
continue;
return(0);
case CDOT:
if (*lp++)
continue;
return(0);
case CDOL:
if (*lp==0)
continue;
return(0);
case CEOF:
loc2 = lp;
return(1);
case CCL:
if (cclass(ep, *lp++, 1)) {
ep += *ep;
continue;
}
return(0);
case NCCL:
if (cclass(ep, *lp++, 0)) {
ep += *ep;
continue;
}
return(0);
case CBRA:
braslist[*ep++] = lp;
continue;
case CKET:
braelist[*ep++] = lp;
continue;
case CBACK:
if (braelist[i = *ep++]==0)
error(Q);
if (backref(i, lp)) {
lp += braelist[i] - braslist[i];
continue;
}
return(0);
case CBACK|STAR:
if (braelist[i = *ep++] == 0)
error(Q);
curlp = lp;
while (backref(i, lp))
lp += braelist[i] - braslist[i];
while (lp >= curlp) {
if (advance(lp, ep))
return(1);
lp -= braelist[i] - braslist[i];
}
continue;
case CDOT|STAR:
curlp = lp;
while (*lp++)
;
goto star;
case CCHR|STAR:
curlp = lp;
while (*lp++ == *ep)
;
ep++;
goto star;
case CCL|STAR:
case NCCL|STAR:
curlp = lp;
while (cclass(ep, *lp++, ep[-1]==(CCL|STAR)))
;
ep += *ep;
goto star;
star:
do {
lp--;
if (lp==locs)
break;
if (advance(lp, ep))
return(1);
} while (lp > curlp);
return(0);
default:
error(Q);
}
}
backref(i, lp)
register i;
register char *lp;
{
register char *bp;
bp = braslist[i];
while (*bp++ == *lp++)
if (bp >= braelist[i])
return(1);
return(0);
}
cclass(set, c, af)
register char *set, c;
{
register n;
if (c==0)
return(0);
n = *set++;
while (--n)
if (*set++ == c)
return(af);
return(!af);
}
putd()
{
register r;
r = count%10;
count /= 10;
if (count)
putd();
putchr(r + '0');
}
edputs(sp)
register char *sp;
{
col = 0;
while (*sp)
putchr(*sp++);
putchr('\n');
}
char line[70];
char *linp = line;
putchr(ac)
{
register char *lp;
register c;
lp = linp;
c = ac;
if (listf) {
col++;
if (col >= 72) {
col = 0;
*lp++ = '\\';
*lp++ = '\n';
}
if (c=='\t') {
c = '>';
goto esc;
}
if (c=='\b') {
c = '<';
esc:
*lp++ = '-';
*lp++ = '\b';
*lp++ = c;
goto out;
}
if (c<' ' && c!= '\n') {
*lp++ = '\\';
*lp++ = (c>>3)+'0';
*lp++ = (c&07)+'0';
col += 2;
goto out;
}
}
*lp++ = c;
out:
if(c == '\n' || lp >= &line[64]) {
linp = line;
write(1, line, lp-line);
return;
}
linp = lp;
}
crblock(permp, buf, nchar, startn)
char *permp;
char *buf;
long startn;
{
register char *p1;
int n1;
int n2;
register char *t1, *t2, *t3;
t1 = permp;
t2 = &permp[256];
t3 = &permp[512];
n1 = startn&0377;
n2 = (startn>>8)&0377;
p1 = buf;
while(nchar--) {
*p1 = t2[(t3[(t1[(*p1+n1)&0377]+n2)&0377]-n2)&0377]-n1;
n1++;
if(n1==256){
n1 = 0;
n2++;
if(n2==256) n2 = 0;
}
p1++;
}
}
getkey()
{
struct termios b;
struct termios save;
void (*sig)(int);
register char *p;
register c;
sig = signal(SIGINT, SIG_IGN);
if (tcgetattr(0, &b) == -1)
error("Input not tty");
save = b;
b.c_cflag &= ~ECHO;
tcsetattr(0, TCSADRAIN, &b);
puts("Key:");
p = key;
while(((c=getchr()) != EOF) && (c!='\n')) {
if(p < &key[KSIZE])
*p++ = c;
}
*p = 0;
b = save;
tcsetattr(0, TCSADRAIN, &b);
signal(SIGINT, sig);
return(key[0] != 0);
}
/*
* Besides initializing the encryption machine, this routine
* returns 0 if the key is null, and 1 if it is non-null.
*/
crinit(keyp, permp)
char *keyp, *permp;
{
register char *t1, *t2, *t3;
register i;
int ic, k, temp, pf[2];
unsigned random;
char buf[13];
long seed;
t1 = permp;
t2 = &permp[256];
t3 = &permp[512];
if(*keyp == 0)
return(0);
strncpy(buf, keyp, 8);
while (*keyp)
*keyp++ = '\0';
buf[8] = buf[0];
buf[9] = buf[1];
if (pipe(pf)<0)
pf[0] = pf[1] = -1;
if (fork()==0) {
close(0);
close(1);
dup(pf[0]);
dup(pf[1]);
execl("/usr/lib/makekey", "-", NULL);
execl("/lib/makekey", "-", NULL);
exit(1);
}
write(pf[1], buf, 10);
if (wait((int *)NULL)==-1 || read(pf[0], buf, 13)!=13)
error("crypt: cannot generate key");
close(pf[0]);
close(pf[1]);
seed = 123;
for (i=0; i<13; i++)
seed = seed*buf[i] + i;
for(i=0;i<256;i++){
t1[i] = i;
t3[i] = 0;
}
for(i=0; i<256; i++) {
seed = 5*seed + buf[i%13];
random = seed % 65521;
k = 256-1 - i;
ic = (random&0377) % (k+1);
random >>= 8;
temp = t1[k];
t1[k] = t1[ic];
t1[ic] = temp;
if(t3[k]!=0) continue;
ic = (random&0377) % k;
while(t3[ic]!=0) ic = (ic+1) % k;
t3[k] = ic;
t3[ic] = k;
}
for(i=0; i<256; i++)
t2[t1[i]&0377] = i;
return(1);
}
makekey(a, b)
char *a, *b;
{
register int i;
long t;
char temp[KSIZE + 1];
for(i = 0; i < KSIZE; i++)
temp[i] = *a++;
time(&t);
t += getpid();
for(i = 0; i < 4; i++)
temp[i] ^= (t>>(8*i))&0377;
crinit(temp, b);
}
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