--- /dev/null
+/* UNIX V7 source code: see /COPYRIGHT or www.tuhs.org for details. */
+
+/*
+ * Editor
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include <termios.h>
+#include <setjmp.h>
+#include <unistd.h>
+
+#undef EOF
+
+#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
+#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 (*oldhup)(int);
+void (*oldquit)(int);
+int vflag = 1;
+char key[KSIZE + 1];
+char crbuf[512];
+char perm[768];
+char tperm[768];
+int listf;
+int col;
+char *globp;
+int tfile = -1;
+char tname[] = "/tmp/eXXXXXX";
+int tline;
+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;
+
+char *mktemp(char *p);
+int *address(void);
+int advance(char *lp, char *ep);
+int append(int (*f)(void), int *a);
+int backref(int i, char *lp);
+void blkio(int b, char *buf, int (*iofcn)(int, char *, int));
+void callunix(void);
+int cclass(char *set, char c, int af);
+void commands(void);
+void compile(int aeof);
+int compsub(void);
+void delete(void);
+void dosub(void);
+void error(const char *s);
+int execute(int gf, int *addr);
+void exfile(void);
+void filename(char comm);
+void gdelete(void);
+char *getblock(int atl, int iof);
+int getchr(void);
+int getcopy(void);
+int getfile(void);
+char *getline(int tl);
+int getsub(void);
+int gettty(void);
+void global(int k);
+void init(void);
+void join(void);
+void move(int cflag);
+void newline(void);
+void nonzero(void);
+void onhup(int unused);
+void onintr(int unused);
+char *place(char *sp, char *l1, char *l2);
+void putchr(int ac);
+void putd(void);
+void putfile(void);
+int putline(void);
+void putstr(char *sp);
+void reverse(int *a1, int *a2);
+void quit(int);
+void rdelete(int *ad1, int *ad2);
+void setall(void);
+void setdot(void);
+void setnoaddr(void);
+void substitute(int inglob);
+
+jmp_buf savej;
+
+int main(int argc, 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 ((int)signal(SIGTERM, SIG_IGN) == 0)
+ 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;
+
+ }
+ argv++;
+ argc--;
+ }
+
+ if (argc>1) {
+ p1 = *argv;
+ p2 = savedfile;
+ while (*p2++ = *p1++)
+ ;
+ globp = "r";
+ }
+ zero = (int *)malloc(nlall*sizeof(int));
+ init();
+ if (((int)oldintr&01) == 0)
+ signal(SIGINT, onintr);
+ if (((int)oldhup&01) == 0)
+ signal(SIGHUP, onhup);
+ setjmp(savej);
+ commands();
+ quit(0);
+}
+
+void commands(void)
+{
+ register int *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);
+ putstr(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 {
+ putstr(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 '=':
+ setall();
+ newline();
+ count = (addr2-zero)&077777;
+ putd();
+ putchr('\n');
+ continue;
+
+ case '!':
+ callunix();
+ continue;
+
+ case EOF:
+ return;
+
+ }
+ error(Q);
+ }
+}
+
+int *address(void)
+{
+ register int *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);
+ }
+}
+
+void setdot(void)
+{
+ if (addr2 == 0)
+ addr1 = addr2 = dot;
+ if (addr1 > addr2)
+ error(Q);
+}
+
+void setall(void)
+{
+ if (addr2==0) {
+ addr1 = zero+1;
+ addr2 = dol;
+ if (dol==zero)
+ addr1 = zero;
+ }
+ setdot();
+}
+
+void setnoaddr(void)
+{
+ if (addr2)
+ error(Q);
+}
+
+void nonzero(void)
+{
+ if (addr1<=zero || addr2>dol)
+ error(Q);
+}
+
+void newline(void)
+{
+ register int c;
+
+ if ((c = getchr()) == '\n')
+ return;
+ if (c=='p' || c=='l') {
+ pflag++;
+ if (c=='l')
+ listf++;
+ if (getchr() == '\n')
+ return;
+ }
+ error(Q);
+}
+
+void filename(char comm)
+{
+ register char *p1, *p2;
+ register int 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++)
+ ;
+ }
+}
+
+void exfile(void)
+{
+ close(io);
+ io = -1;
+ if (vflag) {
+ putd();
+ putchr('\n');
+ }
+}
+
+void onintr(int unused)
+{
+ signal(SIGINT, onintr);
+ putchr('\n');
+ lastc = '\n';
+ error(Q);
+}
+
+void onhup(int unused)
+{
+ 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);
+}
+
+void error(char *s)
+{
+ register int c;
+
+ wrapp = 0;
+ listf = 0;
+ putchr('?');
+ putstr(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);
+}
+
+int getchr(void)
+{
+ 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);
+}
+
+int gettty(void)
+{
+ register int 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);
+}
+
+int getfile(void)
+{
+ register int 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) {
+ 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);
+}
+
+void putfile(void)
+{
+ int *a1, n;
+ register char *fp, *lp;
+ register int nib;
+
+ nib = 512;
+ fp = genbuf;
+ a1 = addr1;
+ do {
+ lp = getline(*a1++);
+ for (;;) {
+ if (--nib < 0) {
+ n = fp-genbuf;
+ if(write(io, genbuf, n) != n) {
+ putstr(WRERR);
+ error(Q);
+ }
+ nib = 511;
+ fp = genbuf;
+ }
+ count++;
+ if ((*fp++ = *lp++) == 0) {
+ fp[-1] = '\n';
+ break;
+ }
+ }
+ } while (a1 <= addr2);
+ n = fp-genbuf;
+ if(write(io, genbuf, n) != n) {
+ putstr(WRERR);
+ error(Q);
+ }
+}
+
+int append(int (*f)(void), int *a)
+{
+ register int *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);
+}
+
+void callunix(void)
+{
+ 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", 0);
+ exit(0100);
+ }
+ savint = signal(SIGINT, SIG_IGN);
+ while ((rpid = wait(&retcode)) != pid && rpid != -1)
+ ;
+ signal(SIGINT, savint);
+ putstr("!");
+}
+
+void quit(int unused)
+{
+ if (vflag && fchange && dol!=zero) {
+ fchange = 0;
+ error(Q);
+ }
+ exit(0);
+}
+
+void delete(void)
+{
+ setdot();
+ newline();
+ nonzero();
+ rdelete(addr1, addr2);
+}
+
+void rdelete(int *ad1, int *ad2)
+{
+ register int *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;
+}
+
+void gdelete(void)
+{
+ register int *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(int tl)
+{
+ register char *bp, *lp;
+ register int 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);
+}
+
+int putline(void)
+{
+ register char *bp, *lp;
+ register int 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);
+}
+
+/* FIXME check lseek */
+void blkin(int b, char *buf)
+{
+ lseek(tfile, (long)b<<9, 0);
+ if (read(tfile, buf, 512) != 512) {
+ error(T);
+ }
+}
+
+void blkout(int b, const char *buf)
+{
+ lseek(tfile, (long)b<<9, 0);
+ if (write(tfile, buf, 512) != 512) {
+ error(T);
+ }
+}
+
+char *getblock(int atl, int iof)
+{
+ register int bno, off;
+
+ 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) {
+ blkout(iblock, ibuff);
+ }
+ ichanged = 0;
+ iblock = bno;
+ blkin(bno, ibuff);
+ return(ibuff+off);
+ }
+ if (oblock>=0)
+ blkout(oblock, obuff);
+ oblock = bno;
+ return(obuff+off);
+}
+
+
+void init(void)
+{
+ register int *markp;
+
+ close(tfile);
+ tline = 2;
+ for (markp = names; markp < names + 26; )
+ *markp++ = 0;
+ subnewa = 0;
+ anymarks = 0;
+ iblock = -1;
+ oblock = -1;
+ ichanged = 0;
+ tfile = mkstemp(tname);
+ dot = dol = zero;
+}
+
+void global(int k)
+{
+ register char *gp;
+ register int 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;
+ }
+ }
+}
+
+void join(void)
+{
+ register char *gp, *lp;
+ register int *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;
+}
+
+void substitute(int inglob)
+{
+ register int *markp, *a1, nl;
+ int gsubf;
+
+ 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);
+}
+
+int compsub(void)
+{
+ register int 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);
+}
+
+int getsub(void)
+{
+ register char *p1, *p2;
+
+ p1 = linebuf;
+ if ((p2 = linebp) == 0)
+ return(EOF);
+ while (*p1++ = *p2++)
+ ;
+ linebp = 0;
+ return(0);
+}
+
+void dosub(void)
+{
+ 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(char *sp, char *l1, char *l2)
+{
+
+ while (l1 < l2) {
+ *sp++ = *l1++;
+ if (sp >= genbuf + LBSIZE)
+ error(Q);
+ }
+ return(sp);
+}
+
+void move(int cflag)
+{
+ register int *adt, *ad1, *ad2;
+
+ 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;
+}
+
+void reverse(int *a1, int *a2)
+{
+ register int t;
+
+ for (;;) {
+ t = *--a2;
+ if (a2 <= a1)
+ return;
+ *a2 = *a1;
+ *a1++ = t;
+ }
+}
+
+int getcopy(void)
+{
+ if (addr1 > addr2)
+ return(EOF);
+ getline(*addr1++);
+ return(0);
+}
+
+void compile(int aeof)
+{
+ register int 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);
+}
+
+int execute(int gf, 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);
+}
+
+int advance(char *lp, char *ep)
+{
+ 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);
+ }
+}
+
+int backref(int i, char *lp)
+{
+ register char *bp;
+
+ bp = braslist[i];
+ while (*bp++ == *lp++)
+ if (bp >= braelist[i])
+ return(1);
+ return(0);
+}
+
+int cclass(char *set, char c, int af)
+{
+ register int n;
+
+ if (c==0)
+ return(0);
+ n = *set++;
+ while (--n)
+ if (*set++ == c)
+ return(af);
+ return(!af);
+}
+
+void putd(void)
+{
+ register int r;
+
+ r = count%10;
+ count /= 10;
+ if (count)
+ putd();
+ putchr(r + '0');
+}
+
+void putstr(char *sp)
+{
+ col = 0;
+ while (*sp)
+ putchr(*sp++);
+ putchr('\n');
+}
+
+char line[70];
+char *linp = line;
+
+void putchr(int ac)
+{
+ register char *lp;
+ register int 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;
+}
+
+
\ No newline at end of file
public / FUZIX.git / commitdiff