Commit | Line | Data |
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9f232b38 ES |
1 | #include <whoami.h> |
2 | #include <stdio.h> | |
3 | #include <signal.h> | |
4 | #include <sgtty.h> | |
5 | #include <setjmp.h> | |
6 | #include <sys/types.h> | |
7 | #include <sys/dir.h> | |
8 | #include <sys/stat.h> | |
9 | ||
10 | #ifdef CORY | |
11 | #define MBIT RAW | |
12 | #else | |
13 | #include <ctype.h> | |
14 | #define MBIT CBREAK | |
15 | #endif | |
16 | ||
17 | #define TBUFSIZ 1024 | |
18 | #define LINSIZ 256 | |
19 | #define ctrl(letter) ('letter' & 077) | |
20 | #define RUBOUT '\177' | |
21 | #define ESC '\033' | |
22 | #define QUIT '\034' | |
23 | ||
24 | struct sgttyb otty; | |
25 | int fnum, no_intty, no_tty, slow_tty; | |
26 | int dum_opt, dlines, onquit(), end_it(); | |
27 | int stop_opt = 1; | |
28 | int promptlen; | |
29 | int startup = 1; | |
30 | int firstf = 1; | |
31 | int notell = 1; | |
32 | int inwait, pause, errors; | |
33 | int within; /* true if we are within a file, | |
34 | false if we are between files */ | |
35 | int hard, dumb, noscroll, hardtabs; | |
36 | char **fnames; | |
37 | int nfiles; | |
38 | char *shell; | |
39 | char ch; | |
40 | jmp_buf restore; | |
41 | char obuf[BUFSIZ]; /* stdout buffer */ | |
42 | char Line[LINSIZ]; | |
43 | int Lpp = 24; /* lines per page */ | |
44 | char *Clear; /* clear screen */ | |
45 | char *eraseln; /* erase line */ | |
46 | char *Senter, *Sexit;/* enter and exit standout mode */ | |
47 | char *tgetstr(); | |
48 | int Mcol = 80; /* number of columns */ | |
49 | int Wrap = 1; /* set if automargins */ | |
50 | extern char PC; /* pad character */ | |
51 | extern short ospeed; | |
52 | ||
53 | ||
54 | main(argc, argv) | |
55 | int argc; | |
56 | char *argv[]; | |
57 | { | |
58 | register FILE *f; | |
59 | register char *s; | |
60 | register char *p; | |
61 | register char ch; | |
62 | register int left; | |
63 | int prnames = 0; | |
64 | int initopt = 0; | |
65 | int srchopt = 0; | |
66 | int initline; | |
67 | char buf[TBUFSIZ]; | |
68 | char clearbuf[100]; | |
69 | char initbuf[80]; | |
70 | char *clearptr; | |
71 | char *getenv(); | |
72 | FILE *checkf(); | |
73 | ||
74 | nfiles = argc; | |
75 | fnames = argv; | |
76 | /* Put terminal setup stuff in separate procedure ?? (From here...) */ | |
77 | setbuf(stdout, obuf); | |
78 | if (!(no_tty = gtty(1, &otty))) { | |
79 | if (tgetent(buf, getenv("TERM")) <= 0) { | |
80 | dumb++; | |
81 | } | |
82 | else { | |
83 | if (((Lpp = tgetnum("li")) < 0) || tgetflag("hc")) { | |
84 | hard++; /* Hard copy terminal */ | |
85 | Lpp = 24; | |
86 | } | |
87 | if (!hard && tgetflag("ns")) | |
88 | noscroll++; | |
89 | if ((Mcol = tgetnum("co")) < 0) | |
90 | Mcol = 80; | |
91 | Wrap = tgetflag("am"); | |
92 | clearptr = clearbuf; | |
93 | eraseln = tgetstr("ce",&clearptr); | |
94 | Clear = tgetstr("cl", &clearptr); | |
95 | Senter = tgetstr("so", &clearptr); | |
96 | Sexit = tgetstr("se", &clearptr); | |
97 | PC = *tgetstr("pc", &clearptr); | |
98 | } | |
99 | if ((shell = getenv("SHELL")) == NULL) | |
100 | shell = "/bin/sh"; | |
101 | } | |
102 | no_intty = gtty(0, &otty); | |
103 | gtty(2, &otty); | |
104 | ospeed = otty.sg_ospeed; | |
105 | slow_tty = ospeed < B1200; | |
106 | hardtabs = !(otty.sg_flags & XTABS); | |
107 | if (!no_tty) { | |
108 | otty.sg_flags &= ~ECHO; | |
109 | if (MBIT == CBREAK || !slow_tty) | |
110 | otty.sg_flags |= MBIT; | |
111 | } | |
112 | /* ... until here or so */ | |
113 | while (--nfiles > 0) { | |
114 | if ((ch = (*++fnames)[0]) == '-') { | |
115 | for (s = fnames[0] + 1, dlines = 0; *s != '\0'; s++) | |
116 | if (isdigit(*s)) | |
117 | dlines = dlines*10 + *s - '0'; | |
118 | else if (*s == 'd') | |
119 | dum_opt = 1; | |
120 | else if (*s == 'l') | |
121 | stop_opt = 0; | |
122 | } | |
123 | else if (ch == '+') { | |
124 | s = *fnames; | |
125 | if (*++s == '/') { | |
126 | srchopt++; | |
127 | for (++s, p = initbuf; p < initbuf + 79 && *s != '\0';) | |
128 | *p++ = *s++; | |
129 | *p = '\0'; | |
130 | } | |
131 | else { | |
132 | initopt++; | |
133 | for (initline = 0; *s != '\0'; s++) | |
134 | if (isdigit (*s)) | |
135 | initline = initline*10 + *s -'0'; | |
136 | --initline; | |
137 | } | |
138 | } | |
139 | else break; | |
140 | } | |
141 | if (dlines == 0) | |
142 | dlines = Lpp - 2; | |
143 | left = dlines; | |
144 | if (nfiles > 1) | |
145 | prnames++; | |
146 | if (!no_intty && nfiles == 0) { | |
147 | fputs("Usage: ",stderr); | |
148 | fputs(argv[0],stderr); | |
149 | fputs(" [-dn] name1 name2 ...\n",stderr); | |
150 | exit(1); | |
151 | } | |
152 | else | |
153 | f = stdin; | |
154 | if (!no_tty) { | |
155 | signal(SIGQUIT, onquit); | |
156 | signal(SIGINT, end_it); | |
157 | stty (2, &otty); | |
158 | } | |
159 | if (no_intty) { | |
160 | if (no_tty) | |
161 | copy_file (stdin); | |
162 | else { | |
163 | if (srchopt) | |
164 | search (initbuf, stdin, 1); | |
165 | else if (initopt) | |
166 | skiplns (initline, stdin); | |
167 | screen (stdin, left); | |
168 | } | |
169 | end_it (); | |
170 | } | |
171 | ||
172 | while (fnum < nfiles) { | |
173 | if ((f = checkf (fnames[fnum])) != NULL) { | |
174 | if (firstf) setjmp (restore); | |
175 | if (firstf) { | |
176 | firstf = 0; | |
177 | if (srchopt) | |
178 | search (initbuf, f, 1); | |
179 | else if (initopt) | |
180 | skiplns (initline, f); | |
181 | } | |
182 | else if (fnum < nfiles && !no_tty) { | |
183 | setjmp (restore); | |
184 | left = command (fnames[fnum], f); | |
185 | } | |
186 | if (left != 0) { | |
187 | if (prnames) { | |
188 | pr("::::::::::::::"); | |
189 | if (promptlen > 14) | |
190 | erase (14); | |
191 | putchar ('\n'); | |
192 | pr(fnames[fnum]); | |
193 | pr("\n::::::::::::::\n"); | |
194 | if (left > Lpp - 4) | |
195 | left = Lpp - 4; | |
196 | } | |
197 | if (no_tty) | |
198 | copy_file (f); | |
199 | else { | |
200 | within++; | |
201 | screen(f, left); | |
202 | within = 0; | |
203 | } | |
204 | } | |
205 | setjmp (restore); | |
206 | fflush(stdout); | |
207 | fclose(f); | |
208 | } | |
209 | fnum++; | |
210 | firstf = 0; | |
211 | } | |
212 | otty.sg_flags |= ECHO; | |
213 | otty.sg_flags &= ~MBIT; | |
214 | stty(2, &otty); | |
215 | exit(0); | |
216 | } | |
217 | ||
218 | /* | |
219 | ** Check whether the file named by fs is an ASCII file which the user may | |
220 | ** access. If it is, return the opened file. Otherwise return NULL. | |
221 | */ | |
222 | ||
223 | FILE * | |
224 | checkf (fs) | |
225 | register char *fs; | |
226 | { | |
227 | #ifdef CORY | |
228 | int space[3]; /* Why doesn't libretro have a V7 stat? */ | |
229 | #endif | |
230 | struct stat stbuf; | |
231 | register FILE *f; | |
232 | char c; | |
233 | ||
234 | if (stat (fs, &stbuf) == -1) { | |
235 | fflush(stdout); | |
236 | perror(fs); | |
237 | return (NULL); | |
238 | } | |
239 | if (stbuf.st_mode & S_IFDIR) { | |
240 | pr("\n*** "); | |
241 | pr(fs); | |
242 | pr(": directory ***\n\n"); | |
243 | return (NULL); | |
244 | } | |
245 | if ((f=fopen(fs, "r")) == NULL) { | |
246 | fflush(stdout); | |
247 | perror(fs); | |
248 | return (NULL); | |
249 | } | |
250 | c = getc(f); | |
251 | ||
252 | /* Try to see whether it is an ASCII file */ | |
253 | ||
254 | switch ((c | *f->_ptr << 8) & 0177777) { | |
255 | case 0405: | |
256 | case 0407: | |
257 | case 0410: | |
258 | case 0411: | |
259 | case 0177545: | |
260 | pr("\n******** "); | |
261 | pr(fs); | |
262 | pr(": Not a text file ********\n\n"); | |
263 | fclose (f); | |
264 | return (NULL); | |
265 | default: | |
266 | break; | |
267 | } | |
268 | if (c == '\f') { | |
269 | c = 0; | |
270 | doclear (); | |
271 | } | |
272 | ungetc (c, f); | |
273 | return (f); | |
274 | } | |
275 | ||
276 | /* | |
277 | ** A real function, for the tputs routine in termlib | |
278 | */ | |
279 | ||
280 | putch (ch) | |
281 | register char ch; | |
282 | { | |
283 | putchar (ch); | |
284 | } | |
285 | ||
286 | /* | |
287 | ** Print out the contents of the file f, one screenful at a time. | |
288 | */ | |
289 | ||
290 | #define STOP -10 | |
291 | ||
292 | screen (f, num_lines) | |
293 | register FILE *f; | |
294 | register int num_lines; | |
295 | { | |
296 | register int c; | |
297 | int nchars; | |
298 | ||
299 | for (;;) { | |
300 | while (num_lines > 0 && !pause) { | |
301 | if ((nchars = getline (f)) == EOF) | |
302 | return; | |
303 | if (Senter && *Senter == ' ' && promptlen > 0) | |
304 | erase (0); | |
305 | pr (Line); | |
306 | if (nchars < promptlen) | |
307 | erase (nchars); /* erase () sets promptlen to 0 */ | |
308 | else promptlen = 0; | |
309 | if (nchars < Mcol) | |
310 | putchar('\n'); | |
311 | if (nchars == STOP) | |
312 | break; | |
313 | num_lines--; | |
314 | } | |
315 | fflush(stdout); | |
316 | if ((c = getc(f)) == EOF) { | |
317 | if (noscroll) | |
318 | doclear(); | |
319 | else | |
320 | erase (0); | |
321 | return; | |
322 | } | |
323 | ungetc (c, f); | |
324 | setjmp (restore); | |
325 | pause = 0; startup = 0; | |
326 | if ((num_lines = command (NULL, f)) == 0) | |
327 | return; | |
328 | } | |
329 | } | |
330 | ||
331 | /* | |
332 | ** Come here if a quit signal is received | |
333 | */ | |
334 | ||
335 | onquit() | |
336 | { | |
337 | signal(SIGQUIT, SIG_IGN); | |
338 | if (!inwait) { | |
339 | putchar ('\n'); | |
340 | if (!startup) { | |
341 | signal(SIGQUIT, onquit); | |
342 | longjmp (restore, 1); | |
343 | } | |
344 | else | |
345 | pause++; | |
346 | } | |
347 | else if (!dum_opt && notell) { | |
348 | write (2, "[Use q or Q to quit]", 20); | |
349 | promptlen += 20; | |
350 | notell = 0; | |
351 | } | |
352 | signal(SIGQUIT, onquit); | |
353 | } | |
354 | ||
355 | /* | |
356 | ** Clean up terminal state and exit. Also come here if interrupt signal received | |
357 | */ | |
358 | ||
359 | end_it () | |
360 | { | |
361 | ||
362 | otty.sg_flags &= ~MBIT; | |
363 | otty.sg_flags |= ECHO; | |
364 | stty(2, &otty); | |
365 | if (promptlen > 0) | |
366 | kill_line (); | |
367 | else | |
368 | putchar ('\n'); | |
369 | exit(0); | |
370 | } | |
371 | ||
372 | copy_file(f) | |
373 | register FILE *f; | |
374 | { | |
375 | register int c; | |
376 | ||
377 | while ((c = getc(f)) != EOF) | |
378 | putchar(c); | |
379 | } | |
380 | ||
381 | ||
382 | printd (n) | |
383 | register int n; | |
384 | { | |
385 | register int a; | |
386 | ||
387 | if (a = n/10) | |
388 | printd(a); | |
389 | putchar(n % 10 + '0'); | |
390 | } | |
391 | ||
392 | static char bell = ctrl(G); | |
393 | ||
394 | strlen (s) | |
395 | char *s; | |
396 | { | |
397 | register char *p; | |
398 | ||
399 | p = s; | |
400 | while (*p++) | |
401 | ; | |
402 | return (p - s - 1); | |
403 | } | |
404 | ||
405 | prompt (filename) | |
406 | char *filename; | |
407 | { | |
408 | if (promptlen > 0) | |
409 | kill_line (); | |
410 | if (!hard) { | |
411 | promptlen = 8; | |
412 | if (Senter && Sexit) | |
413 | tputs (Senter, 1, putch); | |
414 | pr("--More--"); | |
415 | if (filename != NULL) { | |
416 | pr("(Next file: "); | |
417 | pr(filename); | |
418 | putchar(')'); | |
419 | promptlen += 13 + strlen(filename); | |
420 | } | |
421 | if (dum_opt) { | |
422 | pr("[Hit space to continue, Rubout to abort]"); | |
423 | promptlen += 40; | |
424 | } | |
425 | if (Senter && Sexit) | |
426 | tputs (Sexit, 1, putch); | |
427 | fflush(stdout); | |
428 | } | |
429 | else | |
430 | write (2, &bell, 1); | |
431 | inwait++; | |
432 | } | |
433 | ||
434 | /* | |
435 | ** Get a logical line | |
436 | */ | |
437 | ||
438 | getline(f) | |
439 | register FILE *f; | |
440 | { | |
441 | register char c; | |
442 | register char *p; | |
443 | register int column; | |
444 | register int i; | |
445 | static int colflg; | |
446 | ||
447 | p = Line; | |
448 | i = column = 0; | |
449 | c = getc (f); | |
450 | if (colflg && c == '\n') c = getc (f); | |
451 | for (i = 1; i < LINSIZ; i++) { | |
452 | if (c == EOF) { | |
453 | if (p > Line) { | |
454 | *p = '\0'; | |
455 | return (column); | |
456 | } | |
457 | return (EOF); | |
458 | } | |
459 | if (c == '\n') | |
460 | break; | |
461 | *p++ = c; | |
462 | if (c == '\t') | |
463 | if (hardtabs && column < promptlen && !hard) { | |
464 | if (eraseln && !dumb) { | |
465 | tputs (eraseln, 1, putch); | |
466 | promptlen = 0; | |
467 | } | |
468 | else { | |
469 | for (--p; column & 7; column++) | |
470 | *p++ = ' '; | |
471 | if (column >= promptlen) promptlen = 0; | |
472 | } | |
473 | } | |
474 | else | |
475 | column = 1 + (column | 7); | |
476 | else if (c == '\b') | |
477 | column--; | |
478 | else if (c == '\r') | |
479 | column = 0; | |
480 | else if (c == '\f' && stop_opt) { | |
481 | p[-1] = '^'; | |
482 | *p++ = 'L'; | |
483 | break; | |
484 | } | |
485 | else if (c == EOF) | |
486 | return (column); | |
487 | else if (c >= ' ') | |
488 | column++; | |
489 | if (column >= Mcol) break; | |
490 | c = getc (f); | |
491 | } | |
492 | if (Mcol > 0 && column >= Mcol) { | |
493 | if (!Wrap) { | |
494 | *p++ = '\n'; | |
495 | i++; | |
496 | } | |
497 | } | |
498 | colflg = (column == Mcol) || c == '\f'; | |
499 | *p = 0; | |
500 | if (c == '\f' && stop_opt) | |
501 | return (STOP); | |
502 | return (column); | |
503 | } | |
504 | ||
505 | /* | |
506 | ** Erase the rest of the prompt, assuming we are starting column col. | |
507 | */ | |
508 | ||
509 | erase (col) | |
510 | register int col; | |
511 | { | |
512 | ||
513 | if (hard || promptlen == 0) | |
514 | return; | |
515 | if (col == 0) | |
516 | putchar ('\r'); | |
517 | if (!dumb && eraseln) | |
518 | tputs (eraseln, 1, putch); | |
519 | else | |
520 | for (col = promptlen - col; col > 0; col--) | |
521 | putchar (' '); | |
522 | promptlen = 0; | |
523 | } | |
524 | ||
525 | /* | |
526 | ** Erase the current line entirely | |
527 | */ | |
528 | ||
529 | kill_line () | |
530 | { | |
531 | erase (0); | |
532 | if (!eraseln || dumb) putchar ('\r'); | |
533 | } | |
534 | ||
535 | /* | |
536 | ** Print string | |
537 | */ | |
538 | ||
539 | pr(s1) | |
540 | char *s1; | |
541 | { | |
542 | register char *s; | |
543 | register char c; | |
544 | ||
545 | for (s = s1; c = *s++; ) | |
546 | putchar(c); | |
547 | } | |
548 | ||
549 | /* | |
550 | ** Clear the screen | |
551 | */ | |
552 | ||
553 | doclear() | |
554 | { | |
555 | if (Clear && Lpp > 0) | |
556 | tputs(Clear, 1, putch); | |
557 | } | |
558 | ||
559 | ||
560 | /* | |
561 | ** Read a command and do it. A command consists of an optional integer | |
562 | ** argument followed by the command character. Return the number of lines | |
563 | ** to display in the next screenful. If there is nothing more to display | |
564 | ** in the current file, zero is returned. | |
565 | */ | |
566 | ||
567 | command (filename, f) | |
568 | char *filename; | |
569 | register FILE *f; | |
570 | { | |
571 | register int nlines; | |
572 | register int retval; | |
573 | register char c; | |
574 | int id, done; | |
575 | char comchar, cmdbuf[80], *p; | |
576 | ||
577 | #define ret(val) retval=val;done++;break | |
578 | ||
579 | done = 0; | |
580 | if (!errors) | |
581 | prompt (filename); | |
582 | else | |
583 | errors = 0; | |
584 | if (MBIT == RAW && slow_tty) { | |
585 | otty.sg_flags |= MBIT; | |
586 | stty(2, &otty); | |
587 | } | |
588 | for (;;) { | |
589 | nlines = number (&comchar); | |
590 | switch (comchar) { | |
591 | case ' ': | |
592 | case 'z': | |
593 | if (nlines == 0) nlines = dlines; | |
594 | else if (comchar == 'z') dlines = nlines; | |
595 | ret (nlines); | |
596 | case 'd': | |
597 | case ctrl(D): | |
598 | ret (11); | |
599 | case RUBOUT: | |
600 | case 'q': | |
601 | case 'Q': | |
602 | end_it (); | |
603 | case 's': | |
604 | case 'f': | |
605 | if (nlines == 0) nlines++; | |
606 | if (comchar == 'f') | |
607 | nlines *= dlines; | |
608 | putchar ('\r'); | |
609 | erase (0); | |
610 | pr("\n...skipping "); | |
611 | printd(nlines); | |
612 | pr(" line"); | |
613 | if (nlines > 1) | |
614 | pr("s\n\n"); | |
615 | else | |
616 | pr("\n\n"); | |
617 | while (nlines > 0) { | |
618 | while ((c = getc (f)) != '\n') | |
619 | if (c == EOF) { | |
620 | retval = 0; | |
621 | done++; | |
622 | goto endsw; | |
623 | } | |
624 | nlines--; | |
625 | } | |
626 | ret (dlines); | |
627 | break; | |
628 | case '\n': | |
629 | ret (1); | |
630 | case 'n': | |
631 | if (nlines == 0) | |
632 | nlines++; | |
633 | putchar ('\r'); | |
634 | erase (0); | |
635 | skipf (nlines); | |
636 | ret (0); | |
637 | case 'p': | |
638 | if (no_intty) { | |
639 | write (2, &bell, 1); | |
640 | break; | |
641 | } | |
642 | putchar ('\r'); | |
643 | erase (0); | |
644 | if (nlines == 0) | |
645 | nlines++; | |
646 | skipf (-nlines); | |
647 | ret (0); | |
648 | case '/': | |
649 | kill_line (); | |
650 | pr ("/"); | |
651 | promptlen = 1; | |
652 | fflush (stdout); | |
653 | ttyin (cmdbuf, 78, '/'); | |
654 | if (nlines == 0) nlines++; | |
655 | write (2, "\r", 1); | |
656 | search (cmdbuf, f, nlines); | |
657 | ret (dlines); | |
658 | case '!': | |
659 | kill_line (); | |
660 | pr ("!"); | |
661 | promptlen = 1; | |
662 | fflush (stdout); | |
663 | ttyin (cmdbuf, 78, '!'); | |
664 | write (2, "\n", 1); | |
665 | promptlen = 0; | |
666 | otty.sg_flags |= ECHO; | |
667 | otty.sg_flags &= ~MBIT; | |
668 | stty(2, &otty); | |
669 | while ((id = fork ()) < 0) | |
670 | ; | |
671 | if (id == 0) { | |
672 | execl (shell, shell, "-c", cmdbuf, 0); | |
673 | write (2, "exec failed\n", 12); | |
674 | exit (1); | |
675 | } | |
676 | signal (SIGINT, SIG_IGN); | |
677 | signal (SIGQUIT, SIG_IGN); | |
678 | wait (0); | |
679 | signal (SIGINT, end_it); | |
680 | signal (SIGQUIT, onquit); | |
681 | otty.sg_flags |= MBIT; | |
682 | otty.sg_flags &= ~ECHO; | |
683 | stty(2, &otty); | |
684 | pr ("----------\n(continue)\n"); | |
685 | fflush (stdout); | |
686 | break; | |
687 | default: | |
688 | write (2, &bell, 1); | |
689 | break; | |
690 | } | |
691 | if (done) break; | |
692 | } | |
693 | putchar ('\r'); | |
694 | endsw: | |
695 | inwait = 0; | |
696 | notell++; | |
697 | if (MBIT == RAW && slow_tty) { | |
698 | otty.sg_flags &= ~MBIT; | |
699 | stty(2, &otty); | |
700 | } | |
701 | return (retval); | |
702 | } | |
703 | ||
704 | char ch; | |
705 | ||
706 | /* | |
707 | ** Read a decimal number from the terminal. Set cmd to the non-digit which | |
708 | ** terminates the number. | |
709 | */ | |
710 | ||
711 | number(cmd) | |
712 | char *cmd; | |
713 | { | |
714 | register int i; | |
715 | ||
716 | i = 0; ch = otty.sg_kill; | |
717 | for (;;) { | |
718 | read (2, &ch, 1); | |
719 | if (ch >= '0' && ch <= '9') | |
720 | i = i*10 + ch - '0'; | |
721 | else if (ch == otty.sg_kill) | |
722 | i = 0; | |
723 | else { | |
724 | *cmd = ch; | |
725 | break; | |
726 | } | |
727 | } | |
728 | return (i); | |
729 | } | |
730 | ||
731 | /* | |
732 | ** Skip n lines in the file f | |
733 | */ | |
734 | ||
735 | skiplns (n, f) | |
736 | register int n; | |
737 | register FILE *f; | |
738 | { | |
739 | register char c; | |
740 | ||
741 | while (n > 0) { | |
742 | while ((c = getc (f)) != '\n') | |
743 | if (c == EOF) | |
744 | return; | |
745 | n--; | |
746 | } | |
747 | } | |
748 | ||
749 | /* | |
750 | ** Skip nskip files in the file list (from the command line). Nskip may be | |
751 | ** negative. | |
752 | */ | |
753 | ||
754 | skipf (nskip) | |
755 | register int nskip; | |
756 | { | |
757 | if (nskip == 0) return; | |
758 | if (nskip > 0) { | |
759 | if (fnum > nfiles - 1) | |
760 | end_it (); | |
761 | } | |
762 | else if (within) | |
763 | ++fnum; | |
764 | fnum += nskip; | |
765 | if (fnum < 0) | |
766 | fnum = 0; | |
767 | else if (fnum > nfiles - 1) | |
768 | fnum = nfiles -1; | |
769 | pr ("\n...Skipping "); | |
770 | pr (nskip > 0 ? "to file " : "back to file "); | |
771 | pr (fnames[fnum]); | |
772 | pr ("\n\n"); | |
773 | --fnum; | |
774 | } | |
775 | ||
776 | readch () | |
777 | { | |
778 | char ch; | |
779 | ||
780 | read (2, &ch, 1); | |
781 | return (ch); | |
782 | } | |
783 | ||
784 | static char BS = '\b'; | |
785 | static char CARAT = '^'; | |
786 | ||
787 | ttyin (buf, nmax, pchar) | |
788 | char buf[]; | |
789 | register int nmax; | |
790 | char pchar; | |
791 | { | |
792 | register char *sptr; | |
793 | register char ch; | |
794 | register int slash = 0; | |
795 | int maxlen; | |
796 | char cbuf; | |
797 | ||
798 | sptr = buf; | |
799 | maxlen = 0; | |
800 | while (sptr - buf < nmax) { | |
801 | if (promptlen > maxlen) maxlen = promptlen; | |
802 | ch = readch (); | |
803 | if (ch == '\\') { | |
804 | slash++; | |
805 | } | |
806 | else if (ch == otty.sg_erase && !slash) { | |
807 | if (sptr > buf) { | |
808 | --promptlen; | |
809 | write (2, &BS, 1); | |
810 | --sptr; | |
811 | if (*sptr < ' ' && *sptr != '\n') { | |
812 | --promptlen; | |
813 | write (2, &BS, 1); | |
814 | } | |
815 | continue; | |
816 | } | |
817 | else { | |
818 | if (!eraseln) promptlen = maxlen; | |
819 | longjmp (restore, 1); | |
820 | } | |
821 | } | |
822 | else if (ch == otty.sg_kill && !slash) { | |
823 | if (hard) | |
824 | pr (" XXX\n"); | |
825 | else { | |
826 | putchar ('\r'); | |
827 | putchar (pchar); | |
828 | if (eraseln) | |
829 | erase (1); | |
830 | promptlen = 1; | |
831 | sptr = buf; | |
832 | } | |
833 | fflush (stdout); | |
834 | continue; | |
835 | } | |
836 | if (slash && (ch == otty.sg_kill || ch == otty.sg_erase)) { | |
837 | write (2, &BS, 1); | |
838 | --sptr; | |
839 | } | |
840 | if (ch != '\\') | |
841 | slash = 0; | |
842 | *sptr++ = ch; | |
843 | if (ch < ' ' && ch != '\n' && ch != ESC) { | |
844 | ch += 0100; | |
845 | write (2, &CARAT, 1); | |
846 | promptlen++; | |
847 | } | |
848 | cbuf = ch; | |
849 | if (ch != '\n' && ch != ESC) { | |
850 | write (2, &cbuf, 1); | |
851 | promptlen++; | |
852 | } | |
853 | else break; | |
854 | } | |
855 | *--sptr = '\0'; | |
856 | if (!eraseln) promptlen = maxlen; | |
857 | if (sptr - buf >= nmax - 1) | |
858 | error ("Line too long"); | |
859 | } | |
860 | ||
861 | /* | |
862 | ** Search for nth ocurrence of regular expression contained in buf in the file | |
863 | */ | |
864 | ||
865 | search (buf, file, n) | |
866 | char buf[]; | |
867 | FILE *file; | |
868 | register int n; | |
869 | { | |
870 | long startline = ftell (file); | |
871 | register long line1 = startline; | |
872 | register long line2 = startline; | |
873 | register long line3 = startline; | |
874 | register int lncount; | |
875 | ||
876 | lncount = 0; | |
877 | compile (buf); | |
878 | while (!feof (file)) { | |
879 | line3 = line2; | |
880 | line2 = line1; | |
881 | line1 = ftell (file); | |
882 | rdline (file); | |
883 | lncount++; | |
884 | if (execute (Line)) | |
885 | if (--n == 0) { | |
886 | if (lncount > 3 || (lncount > 1 && no_intty)) | |
887 | pr ("\n...skipping\n"); | |
888 | if (!no_intty) | |
889 | fseek (file, line3, 0); | |
890 | else { | |
891 | kill_line (); | |
892 | pr (Line); | |
893 | putchar ('\n'); | |
894 | } | |
895 | break; | |
896 | } | |
897 | } | |
898 | if (feof (file)) { | |
899 | if (!no_intty) { | |
900 | #ifdef CORY | |
901 | file->_flag &= ~_IOEOF; /* why doesn't fseek do this ??!!??! */ | |
902 | #endif | |
903 | fseek (file, startline, 0); | |
904 | } | |
905 | else { | |
906 | pr ("\nPattern not found\n"); | |
907 | end_it (); | |
908 | } | |
909 | error ("Pattern not found"); | |
910 | } | |
911 | } | |
912 | ||
913 | /* | |
914 | * The following are adapted from the editor | |
915 | */ | |
916 | ||
917 | /* | |
918 | * Internal form of regular expressions. | |
919 | */ | |
920 | #define CBRA 1 /* left \( bracket */ | |
921 | #define CCHR 2 /* a particular character */ | |
922 | #define CDOT 4 /* any char (.) */ | |
923 | #define CCL 6 /* begin class ([) */ | |
924 | #define NCCL 8 /* begin not class ([^) */ | |
925 | #define CDOL 10 /* end of line ($) */ | |
926 | #define CEOF 11 /* end of pattern */ | |
927 | #define CKET 12 /* right \) bracket */ | |
928 | #define CBACK 14 /* repeat previous match (\1, etc on lhs) */ | |
929 | ||
930 | #define STAR 01 /* or'ed with some symbols to indicate * suffix */ | |
931 | ||
932 | #define NBRA 5 /* max # of \( \) pairs */ | |
933 | ||
934 | char expbuf[BUFSIZ]; | |
935 | char *braslist[NBRA]; | |
936 | char *braelist[NBRA]; | |
937 | int nbra; | |
938 | int circfl; | |
939 | char *loc1; | |
940 | char *loc2; | |
941 | char *locs; | |
942 | ||
943 | ||
944 | /* | |
945 | * compile: convert typed in regular expression into internal form. | |
946 | * eof is the char that delimits the r.e. | |
947 | * General structure of compiled r.e. in expbuf: A sequence of codes | |
948 | * from #defines above (CCHR, CDOT, etc). Some of these take arguments | |
949 | * which follow in line (e.g. CCHR is followed by the particular character | |
950 | * it is required to match.) CEOF terminates the r.e. | |
951 | */ | |
952 | compile(inbuf) | |
953 | char inbuf[]; | |
954 | { | |
955 | register char c; | |
956 | register char *ep; | |
957 | register char *bp = inbuf; | |
958 | char *lastep; | |
959 | char bracket[NBRA], *bracketp; | |
960 | int cclcnt; | |
961 | ||
962 | /* comerr: compilation error. Don't leave half baked r.e. around. */ | |
963 | #define comerr(msg) {expbuf[0] = 0; nbra = 0; error(msg); } | |
964 | ep = expbuf; | |
965 | bracketp = bracket; | |
966 | if ((c = *bp++) == '\0') { | |
967 | /* null r.e.: just re-use last r.e., which is still there */ | |
968 | if (*ep==0) | |
969 | error("No previous regular expression"); | |
970 | return; | |
971 | } | |
972 | nbra = 0; | |
973 | /* circfl: true if have ^ (anchored search). */ | |
974 | circfl = 0; | |
975 | if (c == '^') { | |
976 | c = *bp++; | |
977 | circfl++; | |
978 | } | |
979 | lastep = 0; | |
980 | --bp; | |
981 | for (;;) { /* for each character in the r.e. */ | |
982 | if (ep >= &expbuf[BUFSIZ]) | |
983 | comerr("r.e. too long"); | |
984 | c = *bp++; | |
985 | if (c == '\0') { | |
986 | /* Hit trailing delim: clean up and quit */ | |
987 | if (bracketp != bracket) | |
988 | comerr("unmatched \\("); | |
989 | *ep++ = CEOF; | |
990 | *ep++ = 0; | |
991 | return; | |
992 | } | |
993 | if (c!='*') | |
994 | lastep = ep; | |
995 | switch (c) { | |
996 | ||
997 | case '\\': | |
998 | if ((c = *bp++)=='(') { | |
999 | /* \(: start of subexpression */ | |
1000 | if (nbra >= NBRA) | |
1001 | comerr("too many \\(\\) pairs"); | |
1002 | *bracketp++ = nbra; | |
1003 | *ep++ = CBRA; | |
1004 | *ep++ = nbra++; | |
1005 | continue; | |
1006 | } | |
1007 | if (c == ')') { | |
1008 | /* \): end of sub exp */ | |
1009 | if (bracketp <= bracket) | |
1010 | comerr("unmatched \\)"); | |
1011 | *ep++ = CKET; | |
1012 | *ep++ = *--bracketp; | |
1013 | continue; | |
1014 | } | |
1015 | if (c>='1' && c<'1'+NBRA) { | |
1016 | /* \1, \2, ...: rematch previous subexp */ | |
1017 | *ep++ = CBACK; | |
1018 | *ep++ = c-'1'; | |
1019 | continue; | |
1020 | } | |
1021 | /* Otherwise just force that char, not specially */ | |
1022 | *ep++ = CCHR; | |
1023 | if (c=='\n') | |
1024 | /* Newlines can't possibly be in lines */ | |
1025 | comerr("multi line r.e. not allowed"); | |
1026 | *ep++ = c; | |
1027 | continue; | |
1028 | ||
1029 | case '.': | |
1030 | /* .: match any character */ | |
1031 | *ep++ = CDOT; | |
1032 | continue; | |
1033 | ||
1034 | case '*': | |
1035 | /* *: Repeat last char indefinitely */ | |
1036 | if (lastep==0 || *lastep==CBRA || *lastep==CKET) | |
1037 | /* Not that smart, so treat * as nonspecial */ | |
1038 | goto defchar; | |
1039 | *lastep |= STAR; | |
1040 | continue; | |
1041 | ||
1042 | case '$': | |
1043 | /* $: match end of line */ | |
1044 | if (*bp != '\0') | |
1045 | /* $ only special at end of r.e. */ | |
1046 | goto defchar; | |
1047 | *ep++ = CDOL; | |
1048 | continue; | |
1049 | ||
1050 | case '[': | |
1051 | /* | |
1052 | * [...]: any of chars enclosed in brackets. | |
1053 | * Compiled form: CCL or NCCL, # of possible chars, | |
1054 | * then each char. -'s are expanded. | |
1055 | */ | |
1056 | *ep++ = CCL; | |
1057 | *ep++ = 0; | |
1058 | cclcnt = 1; | |
1059 | if ((c = *bp++) == '^') { | |
1060 | /* [^...]: reverse sense of match */ | |
1061 | c = *bp++; | |
1062 | ep[-2] = NCCL; | |
1063 | } | |
1064 | do { /* for each char in brackets */ | |
1065 | if (c=='\n') | |
1066 | comerr("missing ]"); | |
1067 | if (c == '-' && ep[-1] != 0) { | |
1068 | /* form ...a-z... but [- not special */ | |
1069 | if ((c = *bp++) == ']') { | |
1070 | /* -] not special either */ | |
1071 | *ep++ = '-'; | |
1072 | cclcnt++; | |
1073 | break; | |
1074 | } | |
1075 | while (ep[-1]<c) { | |
1076 | /* insert all chars between */ | |
1077 | *ep = ep[-1]+1; | |
1078 | ep++; | |
1079 | cclcnt++; | |
1080 | if (ep>=&expbuf[BUFSIZ]) | |
1081 | comerr("Too long"); | |
1082 | } | |
1083 | } | |
1084 | *ep++ = c; | |
1085 | cclcnt++; | |
1086 | if (ep >= &expbuf[BUFSIZ]) | |
1087 | comerr("Too long"); | |
1088 | } while ((c = *bp++) != ']'); | |
1089 | lastep[1] = cclcnt; /* backpatch count */ | |
1090 | continue; | |
1091 | ||
1092 | defchar: | |
1093 | default: | |
1094 | /* | |
1095 | * An ordinary char or one treated as ordinary. | |
1096 | * Store CCHR followed by that char, rather than | |
1097 | * just the char. This causes most r.e.'s to take | |
1098 | * up about twice the space you would expect. | |
1099 | * On the other hand, it makes r.e.'s beautifully | |
1100 | * portable, even though the codes could be real | |
1101 | * characters. | |
1102 | */ | |
1103 | *ep++ = CCHR; | |
1104 | *ep++ = c; | |
1105 | } | |
1106 | } | |
1107 | } | |
1108 | ||
1109 | /* | |
1110 | * execute: look for the compiled r.e. on line addr. | |
1111 | * gf is 0 if this is the first time on this line, otherwise nonzero. | |
1112 | * If not first, start looking at locs, otherwise at beg of linebuf. | |
1113 | * loc1 and loc2 are set to the ends of the pattern found, if any. | |
1114 | * 1 is returned if successful, otherwise 0. | |
1115 | */ | |
1116 | execute(lptr) | |
1117 | char *lptr; | |
1118 | { | |
1119 | register char *p1, *p2; | |
1120 | register int c; | |
1121 | ||
1122 | for (c=0; c<NBRA; c++) { | |
1123 | braslist[c] = 0; | |
1124 | braelist[c] = 0; | |
1125 | } | |
1126 | p1 = lptr; | |
1127 | p2 = expbuf; | |
1128 | if (circfl) { | |
1129 | /* anchored search (^): just try one advance. */ | |
1130 | loc1 = p1; | |
1131 | return(advance(p1, p2)); | |
1132 | } | |
1133 | /* fast check for first character */ | |
1134 | if (*p2==CCHR) { | |
1135 | c = p2[1]; | |
1136 | do { | |
1137 | if (*p1!=c) | |
1138 | continue; | |
1139 | if (advance(p1, p2)) { | |
1140 | loc1 = p1; | |
1141 | return(1); | |
1142 | } | |
1143 | } while (*p1++); | |
1144 | return(0); | |
1145 | } | |
1146 | /* regular algorithm, try advance starting at each char position. */ | |
1147 | do { | |
1148 | if (advance(p1, p2)) { | |
1149 | loc1 = p1; | |
1150 | return(1); | |
1151 | } | |
1152 | } while (*p1++); | |
1153 | return(0); | |
1154 | } | |
1155 | ||
1156 | /* | |
1157 | * advance: does an anchored search for expression starting at ep, | |
1158 | * looking in line starting at lp. Returns 1 if matches, else 0. | |
1159 | * If found, loc2 is set to end of pattern. | |
1160 | */ | |
1161 | advance(lp, ep) | |
1162 | register char *ep, *lp; | |
1163 | { | |
1164 | register char *curlp; | |
1165 | int i; | |
1166 | ||
1167 | for (;;) switch (*ep++) { /* for each code in r.e., look at it..*/ | |
1168 | ||
1169 | case CCHR: | |
1170 | if (*ep++ == *lp++) | |
1171 | continue; | |
1172 | return(0); | |
1173 | ||
1174 | case CDOT: | |
1175 | if (*lp++) | |
1176 | continue; | |
1177 | return(0); | |
1178 | ||
1179 | case CDOL: | |
1180 | if (*lp==0) | |
1181 | continue; | |
1182 | return(0); | |
1183 | ||
1184 | case CEOF: | |
1185 | loc2 = lp; | |
1186 | return(1); | |
1187 | ||
1188 | case CCL: | |
1189 | if (cclass(ep, *lp++, 1)) { | |
1190 | ep += *ep; | |
1191 | continue; | |
1192 | } | |
1193 | return(0); | |
1194 | ||
1195 | case NCCL: | |
1196 | if (cclass(ep, *lp++, 0)) { | |
1197 | ep += *ep; | |
1198 | continue; | |
1199 | } | |
1200 | return(0); | |
1201 | ||
1202 | case CBRA: | |
1203 | braslist[*ep++] = lp; | |
1204 | continue; | |
1205 | ||
1206 | case CKET: | |
1207 | braelist[*ep++] = lp; | |
1208 | continue; | |
1209 | ||
1210 | case CBACK: | |
1211 | if (braelist[i = *ep++]==0) | |
1212 | error("bad back reference"); | |
1213 | if (backref(i, lp)) { | |
1214 | lp += braelist[i] - braslist[i]; | |
1215 | continue; | |
1216 | } | |
1217 | return(0); | |
1218 | ||
1219 | case CBACK|STAR: | |
1220 | if (braelist[i = *ep++] == 0) | |
1221 | error("bad back reference"); | |
1222 | curlp = lp; | |
1223 | while (backref(i, lp)) | |
1224 | lp += braelist[i] - braslist[i]; | |
1225 | while (lp >= curlp) { | |
1226 | if (advance(lp, ep)) | |
1227 | return(1); | |
1228 | lp -= braelist[i] - braslist[i]; | |
1229 | } | |
1230 | continue; | |
1231 | ||
1232 | case CDOT|STAR: | |
1233 | curlp = lp; | |
1234 | while (*lp++) | |
1235 | ; | |
1236 | goto star; | |
1237 | ||
1238 | case CCHR|STAR: | |
1239 | curlp = lp; | |
1240 | while (*lp++ == *ep) | |
1241 | ; | |
1242 | ep++; | |
1243 | goto star; | |
1244 | ||
1245 | case CCL|STAR: | |
1246 | case NCCL|STAR: | |
1247 | curlp = lp; | |
1248 | while (cclass(ep, *lp++, ep[-1]==(CCL|STAR))) | |
1249 | ; | |
1250 | ep += *ep; | |
1251 | goto star; | |
1252 | ||
1253 | star: | |
1254 | /* | |
1255 | * star: special treatment. We have found as many of them | |
1256 | * as there are to find. Maybe this was too many, as dictated | |
1257 | * by what follows in the pattern. Try, starting from the | |
1258 | * end, to recursively advance after each char found, | |
1259 | * and return after first successful advance (thus finding | |
1260 | * largest possible string that matches). | |
1261 | */ | |
1262 | do { | |
1263 | lp--; | |
1264 | if (lp==locs) | |
1265 | break; | |
1266 | if (advance(lp, ep)) | |
1267 | return(1); | |
1268 | } while (lp > curlp); | |
1269 | /* star failed at all attempts, so whole pattern fails. */ | |
1270 | return(0); | |
1271 | ||
1272 | default: | |
1273 | longjmp (restore, 1); | |
1274 | } | |
1275 | } | |
1276 | ||
1277 | /* | |
1278 | * backref: checks to see that text starting at lp matches previous | |
1279 | * sub-expression #i. Returns 1 if successful, else 0. (Used for \k | |
1280 | * on lhs.) | |
1281 | */ | |
1282 | backref(i, lp) | |
1283 | register int i; | |
1284 | register char *lp; | |
1285 | { | |
1286 | register char *bp; | |
1287 | ||
1288 | bp = braslist[i]; | |
1289 | while (*bp++ == *lp++) | |
1290 | if (bp >= braelist[i]) | |
1291 | return(1); | |
1292 | return(0); | |
1293 | } | |
1294 | ||
1295 | /* | |
1296 | * cclass: check to see if character c is in class starting at set. | |
1297 | * ([...] construction on lhs of r.e.) af is sense of success/failure: | |
1298 | * af=1 is normal (success returns 1), af=0 is reversed for [^ (success | |
1299 | * returns 0). | |
1300 | */ | |
1301 | int | |
1302 | cclass(set, c, af) | |
1303 | register char *set, c; | |
1304 | int af; | |
1305 | { | |
1306 | register n; | |
1307 | ||
1308 | if (c==0) | |
1309 | return(0); | |
1310 | n = *set++; | |
1311 | while (--n) | |
1312 | if (*set++ == c) | |
1313 | return(af); | |
1314 | return(!af); | |
1315 | } | |
1316 | ||
1317 | error (mess) | |
1318 | char *mess; | |
1319 | { | |
1320 | if (promptlen > 0) | |
1321 | if (hard) | |
1322 | putchar ('\n'); | |
1323 | else | |
1324 | kill_line (); | |
1325 | promptlen += strlen (mess); | |
1326 | if (Senter && Sexit) { | |
1327 | tputs (Senter, 1, putch); | |
1328 | pr(mess); | |
1329 | tputs (Sexit, 1, putch); | |
1330 | } | |
1331 | else | |
1332 | pr (mess); | |
1333 | if (hard) | |
1334 | putchar ('\n'); | |
1335 | fflush(stdout); | |
1336 | errors++; | |
1337 | longjmp (restore, 1); | |
1338 | } | |
1339 | ||
1340 | rdline (f) | |
1341 | register FILE *f; | |
1342 | { | |
1343 | register char c; | |
1344 | register char *p; | |
1345 | ||
1346 | p = Line; | |
1347 | while ((c = getc (f)) != '\n' && c != EOF && p - Line < LINSIZ - 1) | |
1348 | *p++ = c; | |
1349 | *p = '\0'; | |
1350 | } |