heirloom-ed
view ed.c @ 1:db609ba8ab93
Added tag 0.1 for changeset 1493bea5ac22
| author | markus schnalke <meillo@marmaro.de> |
|---|---|
| date | Mon, 05 Sep 2011 16:36:26 +0200 |
| parents | |
| children | a09d0630f05b |
line source
1 /*
2 * Editor
3 */
5 /*
6 * Changes by Gunnar Ritter, Freiburg i. Br., Germany, July 2003.
7 */
8 /* from Unix 32V /usr/src/cmd/ed.c */
9 /*
10 * Copyright(C) Caldera International Inc. 2001-2002. All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * Redistributions of source code and documentation must retain the
16 * above copyright notice, this list of conditions and the following
17 * disclaimer.
18 * Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * All advertising materials mentioning features or use of this software
22 * must display the following acknowledgement:
23 * This product includes software developed or owned by Caldera
24 * International, Inc.
25 * Neither the name of Caldera International, Inc. nor the names of
26 * other contributors may be used to endorse or promote products
27 * derived from this software without specific prior written permission.
28 *
29 * USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
30 * INTERNATIONAL, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
31 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
32 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL CALDERA INTERNATIONAL, INC. BE
34 * LIABLE FOR ANY DIRECT, INDIRECT INCIDENTAL, SPECIAL, EXEMPLARY, OR
35 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
36 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
37 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
38 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
39 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
40 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
41 */
43 #if __GNUC__ >= 3 && __GNUC_MINOR__ >= 4 || __GNUC__ >= 4
44 #define USED __attribute__ ((used))
45 #elif defined __GNUC__
46 #define USED __attribute__ ((unused))
47 #else
48 #define USED
49 #endif
50 #if defined (SU3)
51 static const char sccsid[] USED = "@(#)ed_su3.sl 1.99 (gritter) 7/27/06";
52 #elif defined (SUS)
53 static const char sccsid[] USED = "@(#)ed_sus.sl 1.99 (gritter) 7/27/06";
54 #elif defined (S42)
55 static const char sccsid[] USED = "@(#)ed_s42.sl 1.99 (gritter) 7/27/06";
56 #else /* !SU3, !SUS, !S42 */
57 static const char sccsid[] USED = "@(#)ed.sl 1.99 (gritter) 7/27/06";
58 #endif /* !SU3, !SUS, !S42 */
60 #include <sys/types.h>
61 #include <sys/stat.h>
62 #include <sys/wait.h>
63 #include <sys/stat.h>
64 #include <fcntl.h>
65 #include <unistd.h>
66 #include <time.h>
67 #include <string.h>
68 #include <stdlib.h>
69 #include <signal.h>
70 #include "sigset.h"
71 #include <termios.h>
72 #include <setjmp.h>
73 #include <libgen.h>
74 #include <inttypes.h>
75 #include <locale.h>
76 #include <wchar.h>
77 #include <ctype.h>
78 #include <wctype.h>
79 #include <limits.h>
80 #include <termios.h>
81 static int FNSIZE;
82 static int LBSIZE;
83 static int RHSIZE;
84 #define ESIZE 2048
85 static int GBSIZE;
86 #undef EOF
87 #define EOF -1
88 #define puts(s) xxputs(s)
89 #define getline(t, n) xxgetline(t, n)
91 #if (LONG_MAX > 017777777777L)
92 #define MAXCNT 0777777777777777777777L /* 2^63-1 */
93 #else
94 #define MAXCNT 017777777777L /* 2^31-1 */
95 #endif
96 #define BLKMSK (MAXCNT>>8) /* was 0377 */
98 #define READ 0
99 #define WRITE 1
100 #define EXIST 2
102 struct tabulator {
103 struct tabulator *t_nxt; /* next list element */
104 const char *t_str; /* tabulator string */
105 int t_tab; /* tab stop position */
106 int t_rep; /* repetitive tab count */
107 };
109 static int peekc;
110 static int lastc;
111 static char *savedfile;
112 static char *file;
113 static struct stat fstbuf;
114 static char *linebuf;
115 static char *rhsbuf;
116 static char expbuf[ESIZE + 4];
117 static long *zero;
118 static long *undzero;
119 static long *dot;
120 static long *unddot;
121 static long *dol;
122 static long *unddol;
123 static long *addr1;
124 static long *addr2;
125 static char *genbuf;
126 static long count;
127 static char *linebp;
128 static int ninbuf;
129 static int io;
130 static int ioeof;
131 static int pflag;
132 static char *wrtemp;
133 static uid_t myuid;
134 static void (*oldhup)(int);
135 static void (*oldquit)(int);
136 static void (*oldpipe)(int);
137 static int vflag = 1;
138 static int listf;
139 static int numbf;
140 static char *globp;
141 static int tfile = -1;
142 static long tline;
143 static char tfname[64];
144 static char ibuff[512];
145 static int iblock = -1;
146 static char obuff[512];
147 static int oblock = -1;
148 static int ichanged;
149 static int nleft;
150 static long *names;
151 static long *undnames;
152 static int anymarks;
153 static int subnewa;
154 static int fchange;
155 static int wrapp;
156 static unsigned nlall = 128;
157 static const char *progname;
158 static const char *prompt = "*";
159 static int Pflag;
160 static int prhelp;
161 static const char *prvmsg;
162 static int lastsig;
163 static int pipid = -1;
164 static int readop;
165 static int status;
166 static int mb_cur_max;
167 static int needsub;
168 static int insub;
169 static struct tabulator *tabstops;
170 static int maxlength;
171 static int rspec;
172 static int Nflag;
173 static int bcount = 22;
174 static int ocount = 11;
176 static jmp_buf savej;
178 static void usage(char, int);
179 static void commands(void);
180 static long *address(void);
181 static void setdot(void);
182 static void setall(void);
183 static void setnoaddr(void);
184 static void nonzero(void);
185 static void newline(void);
186 static void filename(int);
187 static void exfile(void);
188 static void onintr(int);
189 static void onhup(int);
190 static void onpipe(int);
191 static void error(const char *);
192 static void error2(const char *, const char *);
193 static void errput(const char *, const char *);
194 static int getchr(void);
195 static int gettty(void);
196 static long getnum(void);
197 static int getfile(void);
198 static void putfile(void);
199 static int append(int (*)(void), long *);
200 static void callunix(void);
201 static char *readcmd(void);
202 static void quit(int);
203 static void delete(void);
204 static void rdelete(long *, long *);
205 static void gdelete(void);
206 static char *getline(long, int);
207 static int putline(void);
208 static char *getblock(long, long);
209 static void blkio(long, char *, int);
210 static void init(void);
211 static void global(int, int);
212 static void globrd(char **, int);
213 static void join(void);
214 static void substitute(int);
215 static int compsub(void);
216 static int getsub(void);
217 static int dosub(int);
218 static int place(int, const char *, const char *);
219 static void move(int);
220 static void reverse(long *, long *);
221 static int getcopy(void);
222 static int execute(int, long *, int);
223 static void cmplerr(int);
224 static void doprnt(long *, long *);
225 static void putd(long);
226 static void puts(const char *);
227 static void nlputs(const char *);
228 static void list(const char *);
229 static int lstchr(int);
230 static void putstr(const char *);
231 static void putchr(int);
232 static void checkpoint(void);
233 static void undo(void);
234 static int maketf(int);
235 static int creatf(const char *);
236 static int sopen(const char *, int);
237 static void sclose(int);
238 static void fspec(const char *);
239 static const char *ftok(const char **);
240 static struct tabulator *tabstring(const char *);
241 static void freetabs(void);
242 static void expand(const char *);
243 static void growlb(const char *);
244 static void growrhs(const char *);
245 static void growfn(const char *);
246 static void help(void);
248 #define INIT
249 #define GETC() getchr()
250 #define UNGETC(c) (peekc = c)
251 #define PEEKC() (peekc = getchr())
252 #define RETURN(c) return c
253 #define ERROR(c) cmplerr(c)
254 static wint_t GETWC(char *);
256 #if defined (SUS) || defined (S42) || defined (SU3)
258 #include <regex.h>
260 #define NBRA 9
262 static char *braslist[NBRA];
263 static char *braelist[NBRA];
264 static char *loc1, *loc2, *locs;
265 static int nbra;
266 static int circf;
267 static int nodelim;
269 static char *compile(char *, char *, const char *, int);
270 static int step(const char *, const char *);
272 #else /* !SUS, !S42, !SU3 */
274 #include <regexp.h>
276 #endif /* !SUS, !S42, !SU3 */
278 int
279 main(int argc, char **argv)
280 {
281 register int i;
282 void (*oldintr)(int);
284 progname = basename(argv[0]);
285 #if defined (SUS) || defined (S42) || defined (SU3)
286 setlocale(LC_COLLATE, "");
287 #endif
288 setlocale(LC_CTYPE, "");
289 mb_cur_max = MB_CUR_MAX;
290 myuid = getuid();
291 oldquit = sigset(SIGQUIT, SIG_IGN);
292 oldhup = sigset(SIGHUP, SIG_IGN);
293 oldintr = sigset(SIGINT, SIG_IGN);
294 if (sigset(SIGTERM, SIG_IGN) != SIG_IGN)
295 sigset(SIGTERM, quit);
296 oldpipe = sigset(SIGPIPE, onpipe);
297 argv++;
298 while (argc > 1 && **argv=='-') {
299 if ((*argv)[1] == '\0') {
300 vflag = 0;
301 goto next;
302 } else if ((*argv)[1] == '-' && (*argv)[2] == '\0') {
303 argv++;
304 argc--;
305 break;
306 }
307 letter: switch((*argv)[1]) {
309 case 's':
310 vflag = 0;
311 break;
313 case 'q':
314 sigset(SIGQUIT, SIG_DFL);
315 vflag = 1;
316 break;
318 case 'p':
319 if ((*argv)[2])
320 prompt = &(*argv)[2];
321 else if (argv[1]) {
322 prompt = argv[1];
323 argv++;
324 argc--;
325 } else
326 usage((*argv)[1], 1);
327 Pflag = 1;
328 goto next;
330 default:
331 usage((*argv)[1], 0);
332 }
333 if ((*argv)[2]) {
334 (*argv)++;
335 goto letter;
336 }
337 next: argv++;
338 argc--;
339 }
341 growfn("no space");
342 if (argc>1) {
343 i = -1;
344 do
345 if (++i >= FNSIZE)
346 growfn("maximum of characters in "
347 "file names reached");
348 while (savedfile[i] = (*argv)[i]);
349 globp = "e";
350 }
351 names = malloc(26*sizeof *names);
352 undnames = malloc(26*sizeof *undnames);
353 zero = malloc(nlall*sizeof *zero);
354 if ((undzero = malloc(nlall*sizeof *undzero)) == NULL)
355 puts("no memory for undo");
356 growlb("no space");
357 growrhs("no space");
358 init();
359 if (oldintr != SIG_IGN)
360 sigset(SIGINT, onintr);
361 if (oldhup != SIG_IGN)
362 sigset(SIGHUP, onhup);
363 setjmp(savej);
364 if (lastsig) {
365 sigrelse(lastsig);
366 lastsig = 0;
367 }
368 commands();
369 quit(0);
370 /*NOTREACHED*/
371 return 0;
372 }
374 static void
375 usage(char c, int misarg)
376 {
377 if (c) {
378 write(2, progname, strlen(progname));
379 if (misarg)
380 write(2, ": option requires an argument -- ", 33);
381 else
382 write(2, ": illegal option -- ", 20);
383 write(2, &c, 1);
384 write(2, "\n", 1);
385 }
386 write(2, "usage: ", 7);
387 write(2, progname, strlen(progname));
388 write(2, " [- | -s] [-p string] [file]\n", 29);
389 exit(2);
390 }
392 static void
393 commands(void)
394 {
395 register long *a1;
396 register int c;
397 int n;
399 for (;;) {
400 if (pflag) {
401 pflag = 0;
402 addr1 = addr2 = dot;
403 goto print;
404 }
405 if (Pflag && globp == NULL)
406 write(1, prompt, strlen(prompt));
407 addr1 = 0;
408 addr2 = 0;
409 switch (c = getchr()) {
410 case ',':
411 case ';':
412 addr2 = c == ',' ? zero+1 : dot;
413 if (((peekc = getchr()) < '0' || peekc > '9') &&
414 peekc != ' ' && peekc != '\t' &&
415 peekc != '+' && peekc != '-' &&
416 peekc != '^' && peekc != '?' &&
417 peekc != '/' && peekc != '$' &&
418 peekc != '.' && peekc != '\'') {
419 addr1 = addr2;
420 a1 = dol;
421 goto loop;
422 }
423 break;
424 default:
425 peekc = c;
426 }
427 do {
428 addr1 = addr2;
429 if ((a1 = address())==0) {
430 c = getchr();
431 break;
432 }
433 loop: addr2 = a1;
434 if ((c=getchr()) == ';') {
435 c = ',';
436 dot = a1;
437 }
438 } while (c==',');
439 if (addr1==0)
440 addr1 = addr2;
441 switch(c) {
443 case 'a':
444 setdot();
445 newline();
446 checkpoint();
447 append(gettty, addr2);
448 continue;
450 case 'c':
451 #if defined (SU3)
452 if (addr1 == zero && addr1+1 <= dol) {
453 if (addr1 == addr2)
454 addr2++;
455 addr1++;
456 }
457 #endif /* SU3 */
458 delete();
459 append(gettty, addr1-1);
460 #if defined (SUS) || defined (SU3)
461 if (dot == addr1-1 && addr1 <= dol)
462 dot = addr1;
463 #endif /* SUS || SU3 */
464 continue;
466 case 'd':
467 delete();
468 continue;
470 case 'E':
471 fchange = 0;
472 c = 'e';
473 case 'e':
474 setnoaddr();
475 if (vflag && fchange) {
476 fchange = 0;
477 error("warning: expecting `w'");
478 }
479 filename(c);
480 init();
481 addr2 = zero;
482 goto caseread;
484 case 'f':
485 setnoaddr();
486 filename(c);
487 puts(savedfile);
488 continue;
490 case 'g':
491 global(1, 0);
492 continue;
494 case 'G':
495 global(1, 1);
496 continue;
498 case 'H':
499 prhelp = !prhelp;
500 /*FALLTHRU*/
502 case 'h':
503 if ((peekc = getchr()) == 'e') {
504 peekc = 0;
505 if (getchr() != 'l' || getchr() != 'p' ||
506 getchr() != '\n')
507 error("illegal suffix");
508 setnoaddr();
509 help();
510 continue;
511 }
512 newline();
513 setnoaddr();
514 if (prvmsg)
515 puts(prvmsg);
516 continue;
518 case 'i':
519 setdot();
520 #if defined (SU3)
521 if (addr1 == zero) {
522 if (addr1 == addr2)
523 addr2++;
524 addr1++;
525 if (dol != zero)
526 nonzero();
527 } else
528 #endif /* SU3 */
529 nonzero();
530 newline();
531 checkpoint();
532 append(gettty, addr2-1);
533 if (dot == addr2-1)
534 dot++;
535 continue;
538 case 'j':
539 if (addr2==0) {
540 addr1 = dot;
541 addr2 = dot+1;
542 }
543 setdot();
544 newline();
545 nonzero();
546 checkpoint();
547 if (addr1 != addr2)
548 join();
549 continue;
551 case 'k':
552 if ((c = getchr()) < 'a' || c > 'z')
553 error("mark not lower case");
554 newline();
555 setdot();
556 nonzero();
557 names[c-'a'] = *addr2 & ~01;
558 anymarks |= 01;
559 continue;
561 case 'm':
562 move(0);
563 continue;
565 case '\n':
566 if (addr2==0)
567 addr2 = dot+1;
568 addr1 = addr2;
569 goto print;
571 case 'n':
572 numbf = 1;
573 newline();
574 goto print;
576 case 'N':
577 newline();
578 setnoaddr();
579 Nflag = !Nflag;
580 continue;
582 case 'b':
583 case 'o':
584 n = getnum();
585 newline();
586 setdot();
587 nonzero();
588 if (n >= 0) {
589 if (c == 'b')
590 bcount = n;
591 else
592 ocount = n;
593 }
594 if (c == 'b') {
595 a1 = addr2+bcount > dol ? dol : addr2 + bcount;
596 doprnt(addr1, a1);
597 dot = a1;
598 } else {
599 a1 = addr2+ocount > dol ? dol : addr2 + ocount;
600 doprnt(addr2-ocount<zero+1?zero+1:addr2-ocount, a1);
601 dot = addr2;
602 }
603 continue;
605 case 'l':
606 listf++;
607 case 'p':
608 newline();
609 print:
610 setdot();
611 nonzero();
612 doprnt(addr1, addr2);
613 dot = addr2;
614 continue;
616 case 'P':
617 setnoaddr();
618 newline();
619 Pflag = !Pflag;
620 continue;
622 case 'Q':
623 fchange = 0;
624 case 'q':
625 setnoaddr();
626 newline();
627 quit(0);
629 case 'r':
630 filename(c);
631 caseread:
632 if ((io = sopen(file, READ)) < 0) {
633 lastc = '\n';
634 error2("cannot open input file", file);
635 }
636 ioeof = 0;
637 setall();
638 ninbuf = 0;
639 if (c == 'r')
640 checkpoint();
641 n = zero != dol;
642 rspec = (c == 'e' || !n) && file[0] != '!';
643 append(getfile, addr2);
644 rspec = 0;
645 exfile();
646 fchange = n;
647 continue;
649 case 's':
650 setdot();
651 nonzero();
652 substitute(globp!=0);
653 continue;
655 case 't':
656 move(1);
657 continue;
659 case 'u':
660 setdot();
661 newline();
662 if (unddot == NULL)
663 error("nothing to undo");
664 undo();
665 continue;
667 case 'v':
668 global(0, 0);
669 continue;
671 case 'V':
672 global(0, 1);
673 continue;
675 case 'W':
676 wrapp++;
677 case 'w':
678 write:
679 setall();
680 if (zero != dol)
681 nonzero();
682 filename(c);
683 if(!wrapp ||
684 ((io = open(file,O_WRONLY|O_APPEND)) == -1) ||
685 ((lseek(io, 0, SEEK_END)) == -1)) {
686 struct stat st;
687 if (lstat(file, &st) == 0 &&
688 (st.st_mode&S_IFMT) == S_IFREG &&
689 st.st_nlink == 1 &&
690 (myuid==0 || myuid==st.st_uid)) {
691 char *cp, *tp;
692 int nio;
693 if ((io = sopen(file, EXIST)) < 0)
694 error("cannot create output file");
695 if ((wrtemp = malloc(strlen(file)+8)) == NULL)
696 error("out of memory");
697 for (cp = file, tp = wrtemp; *cp; cp++)
698 *tp++ = *cp;
699 while (tp > wrtemp && tp[-1] != '/')
700 tp--;
701 for (cp = "\7XXXXXX"; *cp; cp++)
702 *tp++ = *cp;
703 *tp = '\0';
704 if ((nio = mkstemp(wrtemp)) < 0) {
705 free(wrtemp);
706 wrtemp = NULL;
707 ftruncate(io, 0);
708 } else {
709 close(io);
710 io = nio;
711 }
712 } else {
713 if ((io = sopen(file, WRITE)) < 0)
714 error("cannot create output file");
715 }
716 }
717 if (zero != dol) {
718 ioeof = 0;
719 wrapp = 0;
720 putfile();
721 }
722 exfile();
723 if (addr1==zero+1 && addr2==dol || addr1==addr2 && dol==zero)
724 fchange = 0;
725 if (c == 'z')
726 quit(0);
727 continue;
729 case 'z':
730 if ((peekc=getchr()) != '\n')
731 error("illegal suffix");
732 setnoaddr();
733 goto write;
735 case '=':
736 setall();
737 newline();
738 putd((addr2-zero)&MAXCNT);
739 putchr('\n');
740 continue;
742 case '!':
743 callunix();
744 continue;
746 case EOF:
747 return;
749 }
750 error("unknown command");
751 }
752 }
754 static long *
755 address(void)
756 {
757 register long *a1;
758 register int minus, c;
759 int n, relerr;
761 minus = 0;
762 a1 = 0;
763 for (;;) {
764 c = getchr();
765 if ('0'<=c && c<='9') {
766 n = 0;
767 do {
768 n *= 10;
769 n += c - '0';
770 } while ((c = getchr())>='0' && c<='9');
771 peekc = c;
772 if (a1==0)
773 a1 = zero;
774 if (minus<0)
775 n = -n;
776 a1 += n;
777 minus = 0;
778 continue;
779 }
780 relerr = 0;
781 if (a1 || minus)
782 relerr++;
783 switch(c) {
784 case ' ':
785 case '\t':
786 continue;
788 case '+':
789 minus++;
790 if (a1==0)
791 a1 = dot;
792 continue;
794 case '-':
795 case '^':
796 minus--;
797 if (a1==0)
798 a1 = dot;
799 continue;
801 case '?':
802 case '/':
803 compile(NULL, expbuf, &expbuf[ESIZE], c);
804 a1 = dot;
805 for (;;) {
806 if (c=='/') {
807 a1++;
808 if (a1 > dol)
809 a1 = zero;
810 } else {
811 a1--;
812 if (a1 < zero)
813 a1 = dol;
814 }
815 if (execute(0, a1, 0))
816 break;
817 if (a1==dot)
818 error("search string not found");
819 }
820 break;
822 case '$':
823 a1 = dol;
824 break;
826 case '.':
827 a1 = dot;
828 break;
830 case '\'':
831 if ((c = getchr()) < 'a' || c > 'z')
832 error("mark not lower case");
833 for (a1=zero; a1<=dol; a1++)
834 if (names[c-'a'] == (*a1 & ~01))
835 break;
836 break;
838 default:
839 peekc = c;
840 if (a1==0)
841 return(0);
842 a1 += minus;
843 if (a1<zero || a1>dol)
844 error("line out of range");
845 return(a1);
846 }
847 if (relerr)
848 error("bad number");
849 }
850 }
852 static void
853 setdot(void)
854 {
855 if (addr2 == 0)
856 addr1 = addr2 = dot;
857 if (addr1 > addr2)
858 error("bad range");
859 }
861 static void
862 setall(void)
863 {
864 if (addr2==0) {
865 addr1 = zero+1;
866 addr2 = dol;
867 if (dol==zero)
868 addr1 = zero;
869 }
870 setdot();
871 }
873 static void
874 setnoaddr(void)
875 {
876 if (addr2)
877 error("Illegal address count");
878 }
880 static void
881 nonzero(void)
882 {
883 if (addr1<=zero || addr2>dol)
884 error("line out of range");
885 }
887 static void
888 newline(void)
889 {
890 register int c;
892 if ((c = getchr()) == '\n')
893 return;
894 if (c=='p' || c=='l' || c=='n') {
895 pflag++;
896 if (c=='l')
897 listf++;
898 else if (c=='n')
899 numbf = 1;
900 if (getchr() == '\n')
901 return;
902 }
903 error("illegal suffix");
904 }
906 static void
907 filename(int comm)
908 {
909 register char *p1, *p2;
910 register int c, i;
912 count = 0;
913 c = getchr();
914 if (c=='\n' || c==EOF) {
915 p1 = savedfile;
916 if (*p1==0 && comm!='f')
917 error("illegal or missing filename");
918 p2 = file;
919 while (*p2++ = *p1++)
920 ;
921 return;
922 }
923 if (c!=' ')
924 error("no space after command");
925 while ((c = getchr()) == ' ')
926 ;
927 if (c=='\n')
928 error("illegal or missing filename");
929 i = 0;
930 do {
931 if (i >= FNSIZE)
932 growfn("maximum of characters in file names reached");
933 file[i++] = c;
934 if (c==' ' && file[0] != '!' || c==EOF)
935 error("illegal or missing filename");
936 } while ((c = getchr()) != '\n');
937 file[i++] = 0;
938 if ((savedfile[0]==0 || comm=='e' || comm=='f') && file[0] != '!') {
939 p1 = savedfile;
940 p2 = file;
941 while (*p1++ = *p2++)
942 ;
943 }
944 }
946 static void
947 exfile(void)
948 {
949 sclose(io);
950 io = -1;
951 if (wrtemp) {
952 extern int rename(const char *, const char *);
953 if (rename(wrtemp, file) < 0)
954 error("cannot create output file");
955 if (myuid == 0)
956 chown(file, fstbuf.st_uid, fstbuf.st_gid);
957 chmod(file, fstbuf.st_mode & 07777);
958 free(wrtemp);
959 wrtemp = NULL;
960 }
961 if (vflag) {
962 putd(count);
963 putchr('\n');
964 }
965 }
967 static void
968 onintr(int signo)
969 {
970 lastsig = signo;
971 putchr('\n');
972 lastc = '\n';
973 if (readop) {
974 puts("\007read may be incomplete - beware!\007");
975 fchange = 0;
976 }
977 error("interrupt");
978 }
980 static void
981 onhup(int signo)
982 {
983 if (dol > zero && fchange) {
984 addr1 = zero+1;
985 addr2 = dol;
986 io = creat("ed.hup", 0666);
987 if (io < 0) {
988 char *home = getenv("HOME");
989 if (home) {
990 char *fn = malloc(strlen(home) + 10);
991 if (fn) {
992 strcpy(fn, home);
993 strcat(fn, "/ed.hup");
994 io = creat(fn, 0666);
995 }
996 }
997 }
998 if (io >= 0)
999 putfile();
1000 }
1001 fchange = 0;
1002 status = 0200 | signo;
1003 quit(0);
1004 }
1006 static void
1007 onpipe(int signo)
1008 {
1009 lastsig = signo;
1010 error("write or open on pipe failed");
1011 }
1013 static void
1014 error(const char *s)
1015 {
1016 error2(s, NULL);
1017 }
1019 static void
1020 error2(const char *s, const char *fn)
1021 {
1022 register int c;
1024 wrapp = 0;
1025 listf = 0;
1026 numbf = 0;
1027 errput(s, fn);
1028 count = 0;
1029 if (lseek(0, 0, SEEK_END) > 0)
1030 status = 2;
1031 pflag = 0;
1032 if (globp)
1033 lastc = '\n';
1034 globp = 0;
1035 peekc = lastc;
1036 if(lastc)
1037 while ((c = getchr()) != '\n' && c != EOF)
1038 ;
1039 if (io > 0) {
1040 sclose(io);
1041 io = -1;
1042 }
1043 if (wrtemp) {
1044 unlink(wrtemp);
1045 free(wrtemp);
1046 wrtemp = NULL;
1047 }
1048 longjmp(savej, 1);
1049 }
1051 static void
1052 errput(const char *s, const char *fn)
1053 {
1054 prvmsg = s;
1055 if (fn) {
1056 putchr('?');
1057 puts(fn);
1058 } else
1059 puts("?");
1060 if (prhelp)
1061 puts(s);
1062 }
1064 static int
1065 getchr(void)
1066 {
1067 char c;
1068 if (lastc=peekc) {
1069 peekc = 0;
1070 return(lastc);
1071 }
1072 if (globp) {
1073 if ((lastc = *globp++) != 0)
1074 return(lastc);
1075 globp = 0;
1076 return(EOF);
1077 }
1078 if (read(0, &c, 1) <= 0)
1079 return(lastc = EOF);
1080 lastc = c;
1081 return(lastc);
1082 }
1084 static int
1085 gettty(void)
1086 {
1087 register int c, i;
1088 register char *gf;
1090 i = 0;
1091 gf = globp;
1092 while ((c = getchr()) != '\n') {
1093 if (c==EOF) {
1094 if (gf)
1095 peekc = c;
1096 return(c);
1097 }
1098 if (c == 0)
1099 continue;
1100 if (i >= LBSIZE)
1101 growlb("line too long");
1102 linebuf[i++] = c;
1103 }
1104 if (i >= LBSIZE-2)
1105 growlb("line too long");
1106 linebuf[i++] = 0;
1107 if (linebuf[0]=='.' && linebuf[1]==0)
1108 return(EOF);
1109 #if !defined (SUS) && !defined (SU3)
1110 if (linebuf[0]=='\\' && linebuf[1]=='.' && linebuf[2]==0)
1111 linebuf[0]='.', linebuf[1]=0;
1112 #endif
1113 return(0);
1114 }
1116 static long
1117 getnum(void)
1118 {
1119 char scount[20];
1120 int i;
1122 i = 0;
1123 while ((peekc=getchr()) >= '0' && peekc <= '9' && i < sizeof scount) {
1124 scount[i++] = peekc;
1125 peekc = 0;
1126 }
1127 scount[i] = '\0';
1128 return i ? atol(scount) : -1;
1129 }
1131 static int
1132 getfile(void)
1133 {
1134 register int c, i, j;
1135 static int nextj;
1137 i = 0;
1138 j = nextj;
1139 do {
1140 if (--ninbuf < 0) {
1141 if (ioeof || (ninbuf=read(io, genbuf, LBSIZE)-1) < 0) {
1142 if (ioeof == 0 && ninbuf < -1) {
1143 puts("input error");
1144 status = 1;
1145 }
1146 if (i > 0) {
1147 puts("'\\n' appended");
1148 c = '\n';
1149 ioeof = 1;
1150 goto wrc;
1151 }
1152 return(EOF);
1153 }
1154 j = 0;
1155 }
1156 c = genbuf[j++]&0377;
1157 wrc: if (i >= LBSIZE) {
1158 lastc = '\n';
1159 growlb("line too long");
1160 }
1161 linebuf[i++] = c ? c : '\n';
1162 count++;
1163 } while (c != '\n');
1164 linebuf[--i] = 0;
1165 nextj = j;
1166 if (rspec && dot == zero)
1167 fspec(linebuf);
1168 if (maxlength && i > maxlength) {
1169 putstr("line too long: lno = ");
1170 putd((dot - zero+1)&MAXCNT);
1171 putchr('\n');
1172 }
1173 return(0);
1174 }
1176 static void
1177 putfile(void)
1178 {
1179 long *a1;
1180 int n;
1181 register char *fp, *lp;
1182 register int nib;
1184 nib = 512;
1185 fp = genbuf;
1186 a1 = addr1;
1187 do {
1188 lp = getline(*a1++, 0);
1189 if (maxlength) {
1190 for (n = 0; lp[n]; n++);
1191 if (n > maxlength) {
1192 putstr("line too long: lno = ");
1193 putd((a1-1 - zero)&MAXCNT);
1194 putchr('\n');
1195 }
1196 }
1197 for (;;) {
1198 if (--nib < 0) {
1199 n = fp-genbuf;
1200 if(write(io, genbuf, n) != n)
1201 error("write error");
1202 nib = 511;
1203 fp = genbuf;
1204 }
1205 count++;
1206 if ((*fp++ = *lp++) == 0) {
1207 fp[-1] = '\n';
1208 break;
1209 } else if (fp[-1] == '\n')
1210 fp[-1] = '\0';
1211 }
1212 } while (a1 <= addr2);
1213 n = fp-genbuf;
1214 if(write(io, genbuf, n) != n)
1215 error("write error");
1216 }
1218 static int
1219 append(int (*f)(void), long *a)
1220 {
1221 register long *a1, *a2, *rdot;
1222 int nline, tl;
1224 nline = 0;
1225 dot = a;
1226 while ((*f)() == 0) {
1227 if ((dol-zero)+1 >= nlall) {
1228 long *ozero = zero;
1229 nlall += 512;
1230 if ((zero = realloc(zero, nlall*sizeof *zero))==NULL) {
1231 lastc = '\n';
1232 zero = ozero;
1233 error("out of memory for append");
1234 }
1235 dot += zero - ozero;
1236 dol += zero - ozero;
1237 addr1 += zero - ozero;
1238 addr2 += zero - ozero;
1239 if (unddot) {
1240 unddot += zero - ozero;
1241 unddol += zero - ozero;
1242 }
1243 if (undzero) {
1244 ozero = undzero;
1245 if ((undzero = realloc(undzero,
1246 nlall*sizeof *undzero)) == 0) {
1247 puts("no memory for undo");
1248 free(ozero);
1249 }
1250 }
1251 }
1252 tl = putline();
1253 nline++;
1254 a1 = ++dol;
1255 a2 = a1+1;
1256 rdot = ++dot;
1257 while (a1 > rdot)
1258 *--a2 = *--a1;
1259 *rdot = tl;
1260 }
1261 return(nline);
1262 }
1264 static void
1265 callunix(void)
1266 {
1267 char *line;
1268 void (*savint)(int);
1269 pid_t pid, rpid;
1270 int retcode;
1272 setnoaddr();
1273 line = readcmd();
1274 if ((pid = fork()) == 0) {
1275 sigset(SIGHUP, oldhup);
1276 sigset(SIGQUIT, oldquit);
1277 sigset(SIGPIPE, oldpipe);
1278 execl(SHELL, "sh", "-c", line, NULL);
1279 _exit(0100);
1280 } else if (pid < 0)
1281 error("fork failed - try again");
1282 savint = sigset(SIGINT, SIG_IGN);
1283 while ((rpid = wait(&retcode)) != pid && rpid != -1)
1284 ;
1285 sigset(SIGINT, savint);
1286 if (vflag)
1287 puts("!");
1288 }
1290 #define cmadd(c) ((i>=cmsize ? \
1291 ((line=realloc(line,cmsize+=128)) == 0 ? \
1292 (error("line too long"),0) : 0, 0) \
1293 : 0), line[i++]=(c))
1295 static char *
1296 readcmd(void)
1297 {
1298 static char *line, *prev;
1299 static int cmsize, pvsize;
1300 char *pp;
1301 int c, mod = 0, i;
1303 i = 0;
1304 if ((c = getchr()) == '!') {
1305 for (pp = prev; *pp; pp++)
1306 line[i++] = *pp;
1307 mod = 1;
1308 c = getchr();
1309 }
1310 while (c != '\n' && c != EOF) {
1311 if (c == '\\') {
1312 c = getchr();
1313 if (c != '%')
1314 cmadd('\\');
1315 cmadd(c);
1316 } else if (c == '%') {
1317 for (pp = savedfile; *pp; pp++)
1318 cmadd(*pp);
1319 mod = 1;
1320 } else
1321 cmadd(c);
1322 c = getchr();
1323 }
1324 cmadd('\0');
1325 if (pvsize < cmsize && (prev = realloc(prev, pvsize=cmsize)) == 0)
1326 error("line too long");
1327 strcpy(prev, line);
1328 if (mod)
1329 nlputs(line);
1330 return line;
1331 }
1333 static void
1334 quit(int signo)
1335 {
1336 lastsig = signo;
1337 if (vflag && fchange) {
1338 fchange = 0;
1339 error("warning: expecting `w'");
1340 }
1341 if (wrtemp)
1342 unlink(wrtemp);
1343 unlink(tfname);
1344 exit(status);
1345 }
1347 static void
1348 delete(void)
1349 {
1350 setdot();
1351 newline();
1352 nonzero();
1353 checkpoint();
1354 rdelete(addr1, addr2);
1355 }
1357 static void
1358 rdelete(long *ad1, long *ad2)
1359 {
1360 register long *a1, *a2, *a3;
1362 a1 = ad1;
1363 a2 = ad2+1;
1364 a3 = dol;
1365 dol -= a2 - a1;
1366 do {
1367 *a1++ = *a2++;
1368 } while (a2 <= a3);
1369 a1 = ad1;
1370 if (a1 > dol)
1371 a1 = dol;
1372 dot = a1;
1373 fchange = 1;
1374 }
1376 static void
1377 gdelete(void)
1378 {
1379 register long *a1, *a2, *a3;
1381 a3 = dol;
1382 for (a1=zero+1; (*a1&01)==0; a1++)
1383 if (a1>=a3)
1384 return;
1385 for (a2=a1+1; a2<=a3;) {
1386 if (*a2&01) {
1387 a2++;
1388 dot = a1;
1389 } else
1390 *a1++ = *a2++;
1391 }
1392 dol = a1-1;
1393 if (dot>dol)
1394 dot = dol;
1395 fchange = 1;
1396 }
1398 static char *
1399 getline(long tl, int nulterm)
1400 {
1401 register char *bp, *lp;
1402 register long nl;
1404 lp = linebuf;
1405 bp = getblock(tl, READ);
1406 nl = nleft;
1407 tl &= ~0377;
1408 while (*lp++ = *bp++) {
1409 if (lp[-1] == '\n' && nulterm) {
1410 lp[-1] = '\0';
1411 break;
1412 }
1413 if (--nl == 0) {
1414 bp = getblock(tl+=0400, READ);
1415 nl = nleft;
1416 }
1417 }
1418 return(linebuf);
1419 }
1421 static int
1422 putline(void)
1423 {
1424 register char *bp, *lp;
1425 register long nl;
1426 long tl;
1428 fchange = 1;
1429 lp = linebuf;
1430 tl = tline;
1431 bp = getblock(tl, WRITE);
1432 nl = nleft;
1433 tl &= ~0377;
1434 while (*bp = *lp++) {
1435 if (*bp++ == '\n' && insub) {
1436 *--bp = 0;
1437 linebp = lp;
1438 break;
1439 }
1440 if (--nl == 0) {
1441 bp = getblock(tl+=0400, WRITE);
1442 nl = nleft;
1443 }
1444 }
1445 nl = tline;
1446 tline += (((lp-linebuf)+03)>>1)&(MAXCNT-1);
1447 return(nl);
1448 }
1450 static char *
1451 getblock(long atl, long iof)
1452 {
1453 register long bno, off;
1455 bno = (atl>>8)&BLKMSK;
1456 off = (atl<<1)&0774;
1457 if (bno >= BLKMSK) {
1458 lastc = '\n';
1459 error("temp file too big");
1460 }
1461 nleft = 512 - off;
1462 if (bno==iblock) {
1463 ichanged |= iof;
1464 return(ibuff+off);
1465 }
1466 if (bno==oblock)
1467 return(obuff+off);
1468 if (iof==READ) {
1469 if (ichanged)
1470 blkio(iblock, ibuff, 1);
1471 ichanged = 0;
1472 iblock = bno;
1473 blkio(bno, ibuff, 0);
1474 return(ibuff+off);
1475 }
1476 if (oblock>=0)
1477 blkio(oblock, obuff, 1);
1478 oblock = bno;
1479 return(obuff+off);
1480 }
1482 static void
1483 blkio(long b, char *buf, int wr)
1484 {
1485 lseek(tfile, b<<9, SEEK_SET);
1486 if ((wr ? write(tfile, buf, 512) : read (tfile, buf, 512)) != 512) {
1487 status = 1;
1488 error("I/O error on temp file");
1489 }
1490 }
1492 static void
1493 init(void)
1494 {
1495 register long *markp;
1497 tline = 2;
1498 for (markp = names; markp < &names[26]; markp++)
1499 *markp = 0;
1500 for (markp = undnames; markp < &undnames[26]; markp++)
1501 *markp = 0;
1502 subnewa = 0;
1503 anymarks = 0;
1504 iblock = -1;
1505 oblock = -1;
1506 ichanged = 0;
1507 tfile = maketf(tfile);
1508 dot = dol = zero;
1509 unddot = NULL;
1510 }
1512 static void
1513 global(int k, int ia)
1514 {
1515 register int c;
1516 register long *a1;
1517 static char *globuf;
1518 char mb[MB_LEN_MAX+1];
1519 int spflag = 0;
1521 if (globp)
1522 error("multiple globals not allowed");
1523 setall();
1524 nonzero();
1525 if ((c=GETWC(mb))=='\n')
1526 error("incomplete global expression");
1527 compile(NULL, expbuf, &expbuf[ESIZE], c);
1528 if (!ia) {
1529 globrd(&globuf, EOF);
1530 if (globuf[0] == '\n')
1531 globuf[0] = 'p', globuf[1] = '\n', globuf[2] = '\0';
1532 } else {
1533 newline();
1534 spflag = pflag;
1535 pflag = 0;
1536 }
1537 checkpoint();
1538 for (a1=zero; a1<=dol; a1++) {
1539 *a1 &= ~01;
1540 if (a1>=addr1 && a1<=addr2 && execute(0, a1, 0)==k)
1541 *a1 |= 01;
1542 }
1543 /*
1544 * Special case: g/.../d (avoid n^2 algorithm)
1545 */
1546 if (!ia && globuf[0]=='d' && globuf[1]=='\n' && globuf[2]=='\0') {
1547 gdelete();
1548 return;
1549 }
1550 for (a1=zero; a1<=dol; a1++) {
1551 if (*a1 & 01) {
1552 *a1 &= ~01;
1553 dot = a1;
1554 if (ia) {
1555 puts(getline(*a1, 0));
1556 if ((c = getchr()) == EOF)
1557 error("command expected");
1558 if (c == 'a' || c == 'c' || c == 'i')
1559 error("a, i, or c not allowed in G");
1560 else if (c == '&') {
1561 if ((c = getchr()) != '\n')
1562 error("end of line expected");
1563 if (globuf == 0 || *globuf == 0)
1564 error("no remembered command");
1565 } else if (c == '\n') {
1566 a1 = zero;
1567 continue;
1568 } else
1569 globrd(&globuf, c);
1570 }
1571 globp = globuf;
1572 commands();
1573 globp = NULL;
1574 a1 = zero;
1575 }
1576 }
1577 if (ia)
1578 pflag = spflag;
1579 }
1581 static void
1582 globrd(char **globuf, register int c)
1583 {
1584 register int i;
1586 if (*globuf == 0 && (*globuf = malloc(GBSIZE=256)) == 0)
1587 error("global too long");
1588 i = 0;
1589 if (c != EOF)
1590 (*globuf)[i++] = c;
1591 while ((c = getchr()) != '\n') {
1592 if (c==EOF)
1593 error("incomplete global expression");
1594 if (c=='\\') {
1595 c = getchr();
1596 if (c!='\n')
1597 (*globuf)[i++] = '\\';
1598 }
1599 (*globuf)[i++] = c;
1600 if (i>=GBSIZE-4 && (*globuf=realloc(*globuf,GBSIZE+=256)) == 0)
1601 error("global too long");
1602 }
1603 (*globuf)[i++] = '\n';
1604 (*globuf)[i++] = 0;
1605 }
1607 static void
1608 join(void)
1609 {
1610 register int i, j;
1611 register long *a1;
1613 j = 0;
1614 for (a1=addr1; a1<=addr2; a1++) {
1615 i = getline(*a1, 0) - linebuf;
1616 while (genbuf[j] = linebuf[i++])
1617 if (j++ >= LBSIZE-2)
1618 growlb("line too long");
1619 }
1620 i = 0;
1621 j = 0;
1622 while (linebuf[i++] = genbuf[j++])
1623 ;
1624 *addr1 = putline();
1625 if (addr1<addr2)
1626 rdelete(addr1+1, addr2);
1627 dot = addr1;
1628 }
1630 static void
1631 substitute(int inglob)
1632 {
1633 register long *markp;
1634 register long *a1;
1635 intptr_t nl;
1636 int gsubf;
1638 checkpoint();
1639 gsubf = compsub();
1640 insub = 1;
1641 for (a1 = addr1; a1 <= addr2; a1++) {
1642 long *ozero;
1643 if (execute(0, a1, 1)==0)
1644 continue;
1645 inglob |= dosub(gsubf < 2);
1646 if (gsubf) {
1647 int i = 1;
1649 while (*loc2) {
1650 if (execute(1, NULL, 1)==0)
1651 break;
1652 inglob |= dosub(gsubf == -1 || ++i == gsubf);
1653 }
1654 }
1655 subnewa = putline();
1656 *a1 &= ~01;
1657 if (anymarks) {
1658 for (markp = names; markp < &names[26]; markp++)
1659 if (*markp == *a1)
1660 *markp = subnewa;
1661 }
1662 *a1 = subnewa;
1663 ozero = zero;
1664 nl = append(getsub, a1);
1665 nl += zero-ozero;
1666 a1 += nl;
1667 addr2 += nl;
1668 }
1669 insub = 0;
1670 if (inglob==0)
1671 error("no match");
1672 }
1674 static int
1675 compsub(void)
1676 {
1677 register int seof, c, i;
1678 static char *oldrhs;
1679 static int orhssz;
1680 char mb[MB_LEN_MAX+1];
1682 if ((seof = GETWC(mb)) == '\n' || seof == ' ')
1683 error("illegal or missing delimiter");
1684 nodelim = 0;
1685 compile(NULL, expbuf, &expbuf[ESIZE], seof);
1686 i = 0;
1687 for (;;) {
1688 c = GETWC(mb);
1689 if (c=='\\') {
1690 if (i >= RHSIZE-2)
1691 growrhs("replacement string too long");
1692 rhsbuf[i++] = c;
1693 c = GETWC(mb);
1694 } else if (c=='\n') {
1695 if (globp && *globp) {
1696 if (i >= RHSIZE-2)
1697 growrhs("replacement string too long");
1698 rhsbuf[i++] = '\\';
1699 }
1700 else if (nodelim)
1701 error("illegal or missing delimiter");
1702 else {
1703 peekc = c;
1704 pflag++;
1705 break;
1706 }
1707 } else if (c==seof)
1708 break;
1709 for (c = 0; c==0 || mb[c]; c++) {
1710 if (i >= RHSIZE-2)
1711 growrhs("replacement string too long");
1712 rhsbuf[i++] = mb[c];
1713 }
1714 }
1715 rhsbuf[i++] = 0;
1716 if (rhsbuf[0] == '%' && rhsbuf[1] == 0) {
1717 if (orhssz == 0)
1718 error("no remembered replacement string");
1719 strcpy(rhsbuf, oldrhs);
1720 } else {
1721 if (orhssz < RHSIZE &&
1722 (oldrhs = realloc(oldrhs, orhssz=RHSIZE)) == 0)
1723 error("replacement string too long");
1724 strcpy(oldrhs, rhsbuf);
1725 }
1726 if ((peekc = getchr()) == 'g') {
1727 peekc = 0;
1728 newline();
1729 return(-1);
1730 } else if (peekc >= '0' && peekc <= '9') {
1731 c = getnum();
1732 if (c < 1 || c > LBSIZE)
1733 error("invalid count");
1734 newline();
1735 return c;
1736 }
1737 newline();
1738 return(0);
1739 }
1741 static int
1742 getsub(void)
1743 {
1744 register char *p1, *p2;
1746 p1 = linebuf;
1747 if ((p2 = linebp) == 0)
1748 return(EOF);
1749 while (*p1++ = *p2++)
1750 ;
1751 linebp = 0;
1752 return(0);
1753 }
1755 static int
1756 dosub(int really)
1757 {
1758 register char *lp, *sp;
1759 register int i, j, k;
1760 int c;
1762 if (!really)
1763 goto copy;
1764 i = 0;
1765 j = 0;
1766 k = 0;
1767 while (&linebuf[i] < loc1)
1768 genbuf[j++] = linebuf[i++];
1769 while (c = rhsbuf[k++]&0377) {
1770 if (c=='&') {
1771 j = place(j, loc1, loc2);
1772 continue;
1773 } else if (c == '\\') {
1774 c = rhsbuf[k++]&0377;
1775 if (c >='1' && c < nbra+'1') {
1776 j = place(j, braslist[c-'1'], braelist[c-'1']);
1777 continue;
1778 }
1779 }
1780 if (j >= LBSIZE)
1781 growlb("line too long");
1782 genbuf[j++] = c;
1783 }
1784 i = loc2 - linebuf;
1785 loc2 = j + linebuf;
1786 #if defined (SUS) || defined (SU3) || defined (S42)
1787 if (loc1 == &linebuf[i]) {
1788 int n;
1789 wchar_t wc;
1790 if (mb_cur_max > 1 && (n = mbtowc(&wc, loc2, mb_cur_max)) > 0)
1791 loc2 += n;
1792 else
1793 loc2++;
1794 }
1795 #endif /* SUS || SU3 || S42 */
1796 while (genbuf[j++] = linebuf[i++])
1797 if (j >= LBSIZE)
1798 growlb("line too long");
1799 if (really) {
1800 lp = linebuf;
1801 sp = genbuf;
1802 } else {
1803 copy: sp = linebuf;
1804 lp = genbuf;
1805 }
1806 while (*lp++ = *sp++)
1807 ;
1808 return really;
1809 }
1811 static int
1812 place(register int j, register const char *l1, register const char *l2)
1813 {
1815 while (l1 < l2) {
1816 genbuf[j++] = *l1++;
1817 if (j >= LBSIZE)
1818 growlb("line too long");
1819 }
1820 return(j);
1821 }
1823 static void
1824 move(int cflag)
1825 {
1826 register long *adt, *ad1, *ad2;
1828 setdot();
1829 nonzero();
1830 if ((adt = address())==0)
1831 error("illegal move destination");
1832 newline();
1833 checkpoint();
1834 if (cflag) {
1835 long *ozero;
1836 intptr_t delta;
1837 ad1 = dol;
1838 ozero = zero;
1839 append(getcopy, ad1++);
1840 ad2 = dol;
1841 delta = zero - ozero;
1842 ad1 += delta;
1843 adt += delta;
1844 } else {
1845 ad2 = addr2;
1846 for (ad1 = addr1; ad1 <= ad2;)
1847 *ad1++ &= ~01;
1848 ad1 = addr1;
1849 }
1850 ad2++;
1851 if (adt<ad1) {
1852 dot = adt + (ad2-ad1);
1853 if ((++adt)==ad1)
1854 return;
1855 reverse(adt, ad1);
1856 reverse(ad1, ad2);
1857 reverse(adt, ad2);
1858 } else if (adt >= ad2) {
1859 dot = adt++;
1860 reverse(ad1, ad2);
1861 reverse(ad2, adt);
1862 reverse(ad1, adt);
1863 } else
1864 error("illegal move destination");
1865 fchange = 1;
1866 }
1868 static void
1869 reverse(register long *a1, register long *a2)
1870 {
1871 register int t;
1873 for (;;) {
1874 t = *--a2;
1875 if (a2 <= a1)
1876 return;
1877 *a2 = *a1;
1878 *a1++ = t;
1879 }
1880 }
1882 static int
1883 getcopy(void)
1884 {
1885 if (addr1 > addr2)
1886 return(EOF);
1887 getline(*addr1++, 0);
1888 return(0);
1889 }
1891 static int
1892 execute(int gf, long *addr, int subst)
1893 {
1894 register char *p1, *p2, c;
1896 for (c=0; c<NBRA; c++) {
1897 braslist[c&0377] = 0;
1898 braelist[c&0377] = 0;
1899 }
1900 if (gf) {
1901 if (circf)
1902 return(0);
1903 p1 = linebuf;
1904 p2 = genbuf;
1905 while (*p1++ = *p2++)
1906 ;
1907 locs = p1 = loc2;
1908 } else {
1909 if (addr==zero)
1910 return(0);
1911 p1 = getline(*addr, 1);
1912 locs = 0;
1913 }
1914 needsub = subst;
1915 return step(p1, expbuf);
1916 }
1918 static void
1919 cmplerr(int c)
1920 {
1921 const char *msg;
1923 #if !defined (SUS) && !defined (S42) && !defined (SU3)
1924 expbuf[0] = 0;
1925 #endif
1926 switch (c) {
1927 case 11:
1928 msg = "Range endpoint too large";
1929 break;
1930 case 16:
1931 msg = "bad number";
1932 break;
1933 case 25:
1934 msg = "`\\digit' out of range";
1935 break;
1936 case 36:
1937 msg = "illegal or missing delimiter";
1938 break;
1939 case 41:
1940 msg = "no remembered search string";
1941 break;
1942 case 42:
1943 msg = "'\\( \\)' imbalance";
1944 break;
1945 case 43:
1946 msg = "Too many `\\(' s";
1947 break;
1948 case 44:
1949 msg = "more than 2 numbers given";
1950 break;
1951 case 45:
1952 msg = "'\\}' expected";
1953 break;
1954 case 46:
1955 msg = "first number exceeds second";
1956 break;
1957 case 49:
1958 msg = "'[ ]' imbalance";
1959 break;
1960 case 50:
1961 msg = "regular expression overflow";
1962 break;
1963 case 67:
1964 msg = "illegal byte sequence";
1965 break;
1966 default:
1967 msg = "regular expression error";
1968 break;
1969 }
1970 error(msg);
1971 }
1973 static void
1974 doprnt(long *bot, long *top)
1975 {
1976 long *a1;
1978 a1 = bot;
1979 do {
1980 if (numbf ^ Nflag) {
1981 putd(a1-zero);
1982 putchr('\t');
1983 }
1984 nlputs(getline(*a1++, 0));
1985 } while (a1 <= top);
1986 pflag = 0;
1987 listf = 0;
1988 numbf = 0;
1989 }
1991 static void
1992 putd(long c)
1993 {
1994 register int r;
1996 r = c%10;
1997 c /= 10;
1998 if (c)
1999 putd(c);
2000 putchr(r + '0');
2001 }
2003 static void
2004 nlputs(register const char *sp)
2005 {
2006 if (listf)
2007 list(sp);
2008 else if (tabstops)
2009 expand(sp);
2010 else
2011 puts(sp);
2012 }
2014 static void
2015 puts(register const char *sp)
2016 {
2017 while (*sp) {
2018 if (*sp != '\n')
2019 putchr(*sp++ & 0377);
2020 else
2021 sp++, putchr('\0');
2022 }
2023 putchr('\n');
2024 }
2026 static void
2027 list(const char *lp)
2028 {
2029 int col, n;
2030 wchar_t c;
2032 col = numbf ^ Nflag ? 8 : 0;
2033 while (*lp) {
2034 if (mb_cur_max > 1 && *lp&0200)
2035 n = mbtowc(&c, lp, mb_cur_max);
2036 else {
2037 n = 1;
2038 c = *lp&0377;
2039 }
2040 if (col+1 >= 72) {
2041 col = 0;
2042 putchr('\\');
2043 putchr('\n');
2044 }
2045 if (n<0 ||
2046 #if defined (SUS) || defined (S42) || defined (SU3)
2047 c == '\\' ||
2048 #endif /* SUS || S42 || SU3 */
2049 !(mb_cur_max>1 ? iswprint(c) : isprint(c))) {
2050 if (n<0)
2051 n = 1;
2052 while (n--)
2053 col += lstchr(*lp++&0377);
2054 } else if (mb_cur_max>1) {
2055 col += wcwidth(c);
2056 while (n--)
2057 putchr(*lp++&0377);
2058 } else {
2059 putchr(*lp++&0377);
2060 col++;
2061 }
2062 }
2063 #if defined (SUS) || defined (S42) || defined (SU3)
2064 putchr('$');
2065 #endif
2066 putchr('\n');
2067 }
2069 static int
2070 lstchr(int c)
2071 {
2072 int cad = 1, d;
2074 #if !defined (SUS) && !defined (S42) && !defined (SU3)
2075 if (c=='\t') {
2076 c = '>';
2077 goto esc;
2078 }
2079 if (c=='\b') {
2080 c = '<';
2081 esc:
2082 putchr('-');
2083 putchr('\b');
2084 putchr(c);
2085 } else if (c == '\n') {
2086 putchr('\\');
2087 putchr('0');
2088 putchr('0');
2089 putchr('0');
2090 cad = 4;
2091 #else /* !SUS, !S42, !SU3 */
2092 if (c == '\n')
2093 c = '\0';
2094 if (c == '\\') {
2095 putchr('\\');
2096 putchr('\\');
2097 cad = 2;
2098 } else if (c == '\a') {
2099 putchr('\\');
2100 putchr('a');
2101 cad = 2;
2102 } else if (c == '\b') {
2103 putchr('\\');
2104 putchr('b');
2105 cad = 2;
2106 } else if (c == '\f') {
2107 putchr('\\');
2108 putchr('f');
2109 cad = 2;
2110 } else if (c == '\r') {
2111 putchr('\\');
2112 putchr('r');
2113 cad = 2;
2114 } else if (c == '\t') {
2115 putchr('\\');
2116 putchr('t');
2117 cad = 2;
2118 } else if (c == '\v') {
2119 putchr('\\');
2120 putchr('v');
2121 cad = 2;
2122 #endif /* !SUS, !S42, !SU3 */
2123 } else {
2124 putchr('\\');
2125 putchr(((c&~077)>>6)+'0');
2126 c &= 077;
2127 d = c & 07;
2128 putchr(c > d ? ((c-d)>>3)+'0' : '0');
2129 putchr(d+'0');
2130 cad = 4;
2131 }
2132 return cad;
2133 }
2135 static void
2136 putstr(const char *s)
2137 {
2138 while (*s)
2139 putchr(*s++);
2140 }
2142 static char line[70];
2143 static char *linp = line;
2145 static void
2146 putchr(int ac)
2147 {
2148 register char *lp;
2149 register int c;
2151 lp = linp;
2152 c = ac;
2153 *lp++ = c;
2154 if(c == '\n' || lp >= &line[64]) {
2155 linp = line;
2156 write(1, line, lp-line);
2157 return;
2158 }
2159 linp = lp;
2160 }
2162 static void
2163 checkpoint(void)
2164 {
2165 long *a1, *a2;
2167 if (undzero && globp == NULL) {
2168 for (a1 = zero+1, a2 = undzero+1; a1 <= dol; a1++, a2++)
2169 *a2 = *a1;
2170 unddot = &undzero[dot-zero];
2171 unddol = &undzero[dol-zero];
2172 for (a1 = names, a2 = undnames; a1 < &names[26]; a1++, a2++)
2173 *a2 = *a1;
2174 }
2175 }
2177 #define swap(a, b) (t = a, a = b, b = t)
2179 static void
2180 undo(void)
2181 {
2182 long *t;
2184 if (undzero == NULL)
2185 error("no undo information saved");
2186 swap(zero, undzero);
2187 swap(dot, unddot);
2188 swap(dol, unddol);
2189 swap(names, undnames);
2190 }
2192 static int
2193 maketf(int fd)
2194 {
2195 char *tmpdir;
2197 if (fd == -1) {
2198 if ((tmpdir = getenv("TMPDIR")) == NULL ||
2199 (fd = creatf(tmpdir)) < 0)
2200 if ((fd = creatf("/var/tmp")) < 0 &&
2201 (fd = creatf("/tmp")) < 0)
2202 error("cannot create temporary file");
2203 } else
2204 ftruncate(fd, 0); /* blkio() will seek to 0 anyway */
2205 return fd;
2206 }
2208 static int
2209 creatf(const char *tmpdir)
2210 {
2211 if (strlen(tmpdir) >= sizeof tfname - 9)
2212 return -1;
2213 strcpy(tfname, tmpdir);
2214 strcat(tfname, "/eXXXXXX");
2215 return mkstemp(tfname);
2216 }
2218 static int
2219 sopen(const char *fn, int rdwr)
2220 {
2221 int pf[2], fd = -1;
2223 if (fn[0] == '!') {
2224 fn++;
2225 if (pipe(pf) < 0)
2226 error("write or open on pipe failed");
2227 switch (pipid = fork()) {
2228 case 0:
2229 if (rdwr == READ)
2230 dup2(pf[1], 1);
2231 else
2232 dup2(pf[0], 0);
2233 close(pf[0]);
2234 close(pf[1]);
2235 sigset(SIGHUP, oldhup);
2236 sigset(SIGQUIT, oldquit);
2237 sigset(SIGPIPE, oldpipe);
2238 execl(SHELL, "sh", "-c", fn, NULL);
2239 _exit(0100);
2240 default:
2241 close(pf[rdwr == READ ? 1 : 0]);
2242 fd = pf[rdwr == READ ? 0 : 1];
2243 break;
2244 case -1:
2245 error("fork failed - try again");
2246 }
2247 } else if (rdwr == READ)
2248 fd = open(fn, O_RDONLY);
2249 else if (rdwr == EXIST)
2250 fd = open(fn, O_WRONLY);
2251 else /*if (rdwr == WRITE)*/
2252 fd = creat(fn, 0666);
2253 if (fd >= 0 && rdwr == READ)
2254 readop = 1;
2255 if (fd >= 0)
2256 fstat(fd, &fstbuf);
2257 return fd;
2258 }
2260 static void
2261 sclose(int fd)
2262 {
2263 int status;
2265 close(fd);
2266 if (pipid >= 0) {
2267 while (wait(&status) != pipid);
2268 pipid = -1;
2269 }
2270 readop = 0;
2271 }
2273 static void
2274 fspec(const char *lp)
2275 {
2276 struct termios ts;
2277 const char *cp;
2279 freetabs();
2280 maxlength = 0;
2281 if (tcgetattr(1, &ts) < 0
2282 #ifdef TAB3
2283 || (ts.c_oflag&TAB3) == 0
2284 #endif
2285 )
2286 return;
2287 while (lp[0]) {
2288 if (lp[0] == '<' && lp[1] == ':')
2289 break;
2290 lp++;
2291 }
2292 if (lp[0]) {
2293 lp += 2;
2294 while ((cp = ftok(&lp)) != NULL) {
2295 switch (*cp) {
2296 case 't':
2297 freetabs();
2298 if ((tabstops = tabstring(&cp[1])) == NULL)
2299 goto err;
2300 break;
2301 case 's':
2302 maxlength = atoi(&cp[1]);
2303 break;
2304 case 'm':
2305 case 'd':
2306 case 'e':
2307 break;
2308 case ':':
2309 if (cp[1] == '>') {
2310 if (tabstops == NULL)
2311 if ((tabstops = tabstring("0"))
2312 == NULL)
2313 goto err;
2314 return;
2315 }
2316 /*FALLTHRU*/
2317 default:
2318 err: freetabs();
2319 maxlength = 0;
2320 errput("PWB spec problem", NULL);
2321 return;
2322 }
2323 }
2324 }
2325 }
2327 static const char *
2328 ftok(const char **lp)
2329 {
2330 const char *cp;
2332 while (**lp && **lp != ':' && (**lp == ' ' || **lp == '\t'))
2333 (*lp)++;
2334 cp = *lp;
2335 while (**lp && **lp != ':' && **lp != ' ' && **lp != '\t')
2336 (*lp)++;
2337 return cp;
2338 }
2340 static struct tabulator *
2341 repetitive(int repetition)
2342 {
2343 struct tabulator *tp, *tabspec;
2344 int col, i;
2346 if ((tp = tabspec = calloc(1, sizeof *tp)) == NULL)
2347 return NULL;
2348 tp->t_rep = repetition;
2349 if (repetition > 0) {
2350 for (col = 1+repetition, i = 0; i < 22; col += repetition) {
2351 if ((tp->t_nxt = calloc(1, sizeof *tp)) == NULL)
2352 return NULL;
2353 tp = tp->t_nxt;
2354 tp->t_tab = col;
2355 }
2356 }
2357 return tabspec;
2358 }
2360 #define blank(c) ((c) == ' ' || (c) == '\t')
2362 static struct tabulator *
2363 tablist(const char *s)
2364 {
2365 struct tabulator *tp, *tabspec;
2366 char *x;
2367 int prev = 0, val;
2369 if ((tp = tabspec = calloc(1, sizeof *tp)) == NULL)
2370 return NULL;
2371 for (;;) {
2372 while (*s == ',')
2373 s++;
2374 if (*s == '\0' || blank(*s) || *s == ':')
2375 break;
2376 val = strtol(s, &x, 10);
2377 if (*s == '+')
2378 val += prev;
2379 prev = val;
2380 if (*s == '-' || (*x != ',' && !blank(*x) && *x != ':' &&
2381 *x != '\0'))
2382 return NULL;
2383 s = x;
2384 if ((tp->t_nxt = calloc(1, sizeof *tp)) == NULL)
2385 return NULL;
2386 tp = tp->t_nxt;
2387 tp->t_tab = val;
2388 }
2389 return tabspec;
2390 }
2392 static struct tabulator *
2393 tabstring(const char *s)
2394 {
2395 const struct {
2396 const char *c_nam;
2397 const char *c_str;
2398 } canned[] = {
2399 { "a", "1,10,16,36,72" },
2400 { "a2", "1,10,16,40,72" },
2401 { "c", "1,8,12,16,20,55" },
2402 { "c2", "1,6,10,14,49" },
2403 { "c3", "1,6,10,14,18,22,26,30,34,38,42,46,50,54,58,62,67" },
2404 { "f", "1,7,11,15,19,23" },
2405 { "p", "1,5,9,13,17,21,25,29,33,37,41,45,49,53,57,61" },
2406 { "s", "1,10,55" },
2407 { "u", "1,12,20,44" },
2408 { 0, 0 }
2409 };
2411 int i, j;
2413 if (s[0] == '-') {
2414 if (s[1] >= '0' && s[1] <= '9' && ((i = atoi(&s[1])) != 0))
2415 return repetitive(i);
2416 for (i = 0; canned[i].c_nam; i++) {
2417 for (j = 0; canned[i].c_nam[j]; j++)
2418 if (s[j+1] != canned[i].c_nam[j])
2419 break;
2420 if ((s[j+1]=='\0' || s[j+1]==':' || blank(s[j+1])) &&
2421 canned[i].c_nam[j] == '\0')
2422 return tablist(canned[i].c_str);
2423 }
2424 return NULL;
2425 } else
2426 return tablist(s);
2427 }
2429 static void
2430 freetabs(void)
2431 {
2432 struct tabulator *tp;
2434 tp = tabstops;
2435 while (tp) {
2436 tabstops = tp->t_nxt;
2437 free(tp);
2438 tp = tabstops;
2439 }
2440 }
2442 static void
2443 expand(const char *s)
2444 {
2445 struct tabulator *tp = tabstops;
2446 int col = 0, n = 1, m, tabcnt = 0, nspc;
2447 wchar_t wc;
2449 while (*s) {
2450 nspc = 0;
2451 switch (*s) {
2452 case '\n':
2453 putchr('\0');
2454 s++;
2455 continue;
2456 case '\t':
2457 if (tp) {
2458 if (tp->t_rep) {
2459 if (col % tp->t_rep == 0) {
2460 nspc++;
2461 col++;
2462 }
2463 while (col % tp->t_rep) {
2464 nspc++;
2465 col++;
2466 }
2467 break;
2468 }
2469 while (tp && (col>tp->t_tab || tp->t_tab == 0))
2470 tp = tp->t_nxt;
2471 if (tp && col == tp->t_tab) {
2472 nspc++;
2473 col++;
2474 tp = tp->t_nxt;
2475 }
2476 if (tp) {
2477 while (col < tp->t_tab) {
2478 nspc++;
2479 col++;
2480 }
2481 tp = tp->t_nxt;
2482 break;
2483 }
2484 }
2485 tabcnt = 1;
2486 nspc++;
2487 break;
2488 default:
2489 if (mb_cur_max>1 && (n=mbtowc(&wc, s, mb_cur_max))>0) {
2490 if ((m = wcwidth(wc)) > 0)
2491 col += m;
2492 } else {
2493 col++;
2494 n = 1;
2495 }
2496 }
2497 if (maxlength && col > maxlength) {
2498 putstr("\ntoo long");
2499 break;
2500 }
2501 if (nspc) {
2502 while (nspc--)
2503 putchr(' ');
2504 s++;
2505 } else
2506 while (n--)
2507 putchr(*s++);
2508 }
2509 if (tabcnt)
2510 putstr("\ntab count");
2511 putchr('\n');
2512 }
2514 static wint_t
2515 GETWC(char *mb)
2516 {
2517 int c, n;
2519 n = 1;
2520 mb[0] = c = GETC();
2521 mb[1] = '\0';
2522 if (mb_cur_max > 1 && c&0200 && c != EOF) {
2523 int m;
2524 wchar_t wc;
2526 while ((m = mbtowc(&wc, mb, mb_cur_max)) < 0 && n<mb_cur_max) {
2527 mb[n++] = c = GETC();
2528 mb[n] = '\0';
2529 if (c == '\n' || c == EOF)
2530 break;
2531 }
2532 if (m != n)
2533 ERROR(67);
2534 return wc;
2535 } else
2536 return c;
2537 }
2539 static void
2540 growlb(const char *msg)
2541 {
2542 char *olb = linebuf;
2543 int i;
2545 LBSIZE += 512;
2546 if ((linebuf = realloc(linebuf, LBSIZE)) == NULL ||
2547 (genbuf = realloc(genbuf, LBSIZE)) == NULL)
2548 error(msg);
2549 if (linebuf != olb) {
2550 loc1 += linebuf - olb;
2551 loc2 += linebuf - olb;
2552 for (i = 0; i < NBRA; i++) {
2553 if (braslist[i])
2554 braslist[i] += linebuf - olb;
2555 if (braelist[i])
2556 braelist[i] += linebuf - olb;
2557 }
2558 }
2559 }
2561 static void
2562 growrhs(const char *msg)
2563 {
2564 RHSIZE += 256;
2565 if ((rhsbuf = realloc(rhsbuf, RHSIZE)) == NULL)
2566 error(msg);
2567 }
2569 static void
2570 growfn(const char *msg)
2571 {
2572 FNSIZE += 64;
2573 if ((savedfile = realloc(savedfile, FNSIZE)) == NULL ||
2574 (file = realloc(file, FNSIZE)) == NULL)
2575 error(msg);
2576 if (FNSIZE == 64)
2577 file[0] = savedfile[0] = 0;
2578 }
2580 #if defined (SUS) || defined (S42) || defined (SU3)
2581 union ptrstore {
2582 void *vp;
2583 char bp[sizeof (void *)];
2584 };
2586 static void *
2587 fetchptr(const char *bp)
2588 {
2589 union ptrstore u;
2590 int i;
2592 for (i = 0; i < sizeof (void *); i++)
2593 u.bp[i] = bp[i];
2594 return u.vp;
2595 }
2597 static void
2598 storeptr(void *vp, char *bp)
2599 {
2600 union ptrstore u;
2601 int i;
2603 u.vp = vp;
2604 for (i = 0; i < sizeof (void *); i++)
2605 bp[i] = u.bp[i];
2606 }
2608 #define add(c) ((i>=LBSIZE ? (growlb("regular expression overflow"),0) : 0), \
2609 genbuf[i++] = (c))
2611 #define copy(s) { \
2612 int m; \
2613 for (m = 0; m==0 || s[m]; m++) \
2614 add(s[m]); \
2615 }
2617 static char *
2618 compile(char *unused, char *ep, const char *endbuf, int seof)
2619 {
2620 INIT
2621 int c, d, i;
2622 regex_t *rp;
2623 char *op;
2624 char mb[MB_LEN_MAX+1];
2626 op = ep;
2627 ep += 2;
2628 if ((rp = fetchptr(ep)) == NULL) {
2629 if ((rp = calloc(1, sizeof *rp)) == NULL)
2630 ERROR(50);
2631 storeptr(rp, ep);
2632 }
2633 ep += sizeof (void *);
2634 i = 0;
2635 nbra = 0;
2636 do {
2637 if ((c = GETWC(mb)) == seof)
2638 add('\0');
2639 else if (c == '\\') {
2640 copy(mb);
2641 c = GETWC(mb);
2642 if (c == '(')
2643 nbra++;
2644 goto normchar;
2645 } else if (c == '[') {
2646 add(c);
2647 d = EOF;
2648 do {
2649 c = GETWC(mb);
2650 if (c == EOF || c == '\n')
2651 ERROR(49);
2652 copy(mb);
2653 if (d=='[' && (c==':' || c=='.' || c=='=')) {
2654 d = c;
2655 do {
2656 c = GETWC(mb);
2657 if (c == EOF || c == '\n')
2658 ERROR(49);
2659 copy(mb);
2660 } while (c != d || PEEKC() != ']');
2661 c = GETWC(mb);
2662 copy(mb);
2663 c = EOF;
2664 }
2665 d = c;
2666 } while (c != ']');
2667 } else {
2668 if (c == EOF || c == '\n') {
2669 if (c == '\n')
2670 UNGETC(c);
2671 mb[0] = c = '\0';
2672 }
2673 if (c == '\0')
2674 nodelim = 1;
2675 normchar: copy(mb);
2676 }
2677 } while (genbuf[i-1] != '\0');
2678 if (genbuf[0]) {
2679 int reflags = 0;
2681 #ifdef REG_ANGLES
2682 reflags |= REG_ANGLES;
2683 #endif
2684 #if defined (SU3) && defined (REG_AVOIDNULL)
2685 reflags |= REG_AVOIDNULL;
2686 #endif
2687 if (op[0])
2688 regfree(rp);
2689 op[0] = 0;
2690 switch (regcomp(rp, genbuf, reflags)) {
2691 case 0:
2692 break;
2693 case REG_ESUBREG:
2694 ERROR(25);
2695 /*NOTREACHED*/
2696 case REG_EBRACK:
2697 ERROR(49);
2698 /*NOTREACHED*/
2699 case REG_EPAREN:
2700 ERROR(42);
2701 /*NOTREACHED*/
2702 case REG_BADBR:
2703 case REG_EBRACE:
2704 ERROR(45);
2705 /*NOTREACHED*/
2706 case REG_ERANGE:
2707 ERROR(11);
2708 /*NOTREACHED*/
2709 case REG_ESPACE:
2710 ERROR(50);
2711 /*NOTREACHED*/
2712 default:
2713 ERROR(-1);
2714 }
2715 op[0] = 1;
2716 circf = op[1] = genbuf[0] == '^';
2717 } else if (op[0]) {
2718 circf = op[1];
2719 } else
2720 ERROR(41);
2721 return ep + sizeof (void *);
2722 }
2724 static int
2725 step(const char *lp, const char *ep)
2726 {
2727 regex_t *rp;
2728 regmatch_t bralist[NBRA+1];
2729 int eflag = 0;
2730 int res;
2731 int i;
2733 rp = fetchptr(&ep[2]);
2734 if (ep[0] == 0)
2735 return 0;
2736 if (locs)
2737 eflag |= REG_NOTBOL;
2738 if ((res = regexec(rp, lp, needsub? NBRA+1 : 0, bralist, eflag)) == 0 &&
2739 needsub) {
2740 loc1 = (char *)lp + bralist[0].rm_so;
2741 loc2 = (char *)lp + bralist[0].rm_eo;
2742 for (i = 1; i <= NBRA; i++) {
2743 if (bralist[i].rm_so != -1) {
2744 braslist[i-1] = (char *)lp + bralist[i].rm_so;
2745 braelist[i-1] = (char *)lp + bralist[i].rm_eo;
2746 } else
2747 braslist[i-1] = braelist[i-1] = NULL;
2748 }
2749 }
2750 return res == 0;
2751 }
2752 #endif /* SUS || S42 || SU3 */
2754 static void
2755 help(void)
2756 {
2757 const char *desc[] = {
2758 "(.)a append up to .",
2759 "(.)b[n] browse n lines",
2760 "(.,.)c change up to .",
2761 "(.,.)d delete lines",
2762 "e [file] edit file",
2763 "E [file] force edit",
2764 "f [file] print or set file",
2765 "(1,$)g/RE/cmd global cmd",
2766 "(1,$)G/RE/ interactive global",
2767 "h print last error",
2768 "H toggle error messages",
2769 "help print this screen",
2770 "(.)i insert up to .",
2771 "(.,.+1)j join lines",
2772 "(.)kx mark line with x",
2773 "(.,.)l list lines",
2774 "(.,.)ma move lines to a",
2775 "(.,.)n number lines",
2776 "N revert n and p",
2777 "(.)o[n] show n lines of context",
2778 "(.,.)p print lines",
2779 "P toggle prompt",
2780 "q quit",
2781 "Q force quit",
2782 "($)r read file",
2783 "(.,.)s/RE/repl/ search and replace",
2784 "(.,.)s/RE/rp/g replace all occurrences",
2785 "(.,.)s/RE/rp/n replace n-th occurrence",
2786 "(.,.)ta transfer lines to a",
2787 "u undo last change",
2788 "(1,$)v/RE/cmd reverse global",
2789 "(1,$)V/RE/ reverse i/a global",
2790 "(1,$)w [file] write file",
2791 "(1,$)W [file] append to file",
2792 "z write buffer and quit",
2793 "($)= print line number",
2794 "!command execute shell command",
2795 "(.+1)<newline> print one line",
2796 "/RE find RE forwards",
2797 "?RE find RE backwards",
2798 "1 first line",
2799 ". current line",
2800 "$ last line",
2801 ", 1,$",
2802 "; .,$",
2803 NULL
2804 };
2805 char line[100];
2806 int c, half, i, k;
2808 half = (sizeof desc / sizeof *desc) / 2;
2809 for (i = 0; i < half && desc[i]; i++) {
2810 c = 0;
2811 for (k = 0; desc[i][k]; k++)
2812 line[c++] = desc[i][k];
2813 if (desc[i+half]) {
2814 while (c < 40)
2815 line[c++] = ' ';
2816 for (k = 0; desc[i+half][k]; k++)
2817 line[c++] = desc[i+half][k];
2818 }
2819 line[c] = 0;
2820 puts(line);
2821 }
2822 }