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31cef89c | 1 | static char *SCCS_ID = "@(#)more.c 4.1 (Berkeley) 10/16/80"; |
ffa58356 ES |
2 | /* |
3 | ** more.c - General purpose tty output filter and file perusal program | |
4 | ** | |
5 | ** by Eric Shienbrood, UC Berkeley | |
6 | */ | |
7 | ||
8 | #include <whoami.h> | |
9 | #ifdef V6 | |
10 | #include <retrofit.h> | |
11 | #endif | |
12 | #include <stdio.h> | |
13 | #include <ctype.h> | |
14 | #include <signal.h> | |
15 | #include <errno.h> | |
16 | #include <sgtty.h> | |
17 | #include <setjmp.h> | |
18 | #include <sys/types.h> | |
19 | #include <sys/dir.h> | |
20 | #include <sys/stat.h> | |
21 | #include <local/uparm.h> | |
22 | ||
23 | /* Help file will eventually go in libpath(more.help) on all systems */ | |
24 | ||
25 | #ifdef INGRES | |
26 | #define VI "/usr/bin/vi" | |
27 | #define HELPFILE "/mntp/doucette/more/more.help" | |
28 | #endif | |
29 | ||
30 | #ifndef INGRES | |
31 | #ifndef HELPFILE | |
32 | #define HELPFILE libpath(more.help) | |
33 | #endif | |
34 | #define VI binpath(vi) | |
35 | #endif | |
36 | ||
37 | #define Fopen(s,m) (Currline = 0,file_pos=0,fopen(s,m)) | |
38 | #define Ftell(f) file_pos | |
39 | #define Fseek(f,off) (file_pos=off,fseek(f,off,0)) | |
40 | #define Getc(f) (++file_pos, getc(f)) | |
41 | #define Ungetc(c,f) (--file_pos, ungetc(c,f)) | |
42 | ||
43 | #ifdef V6 | |
44 | #define MBIT RAW | |
45 | #define CBREAK ~RAW | |
46 | #else | |
47 | #define MBIT CBREAK | |
48 | #define stty(fd,argp) ioctl(fd,TIOCSETN,argp) | |
49 | #endif | |
50 | ||
51 | #define TBUFSIZ 1024 | |
52 | #define LINSIZ 256 | |
53 | #define ctrl(letter) ('letter' & 077) | |
54 | #define RUBOUT '\177' | |
55 | #define ESC '\033' | |
56 | #define QUIT '\034' | |
57 | ||
58 | struct sgttyb otty; | |
59 | long file_pos, file_size; | |
60 | int fnum, no_intty, no_tty, slow_tty; | |
61 | int dum_opt, dlines, onquit(), end_it(); | |
62 | #ifdef SIGTSTP | |
63 | int onsusp(); | |
64 | #endif | |
65 | int nscroll = 11; /* Number of lines scrolled by 'd' */ | |
66 | int fold_opt = 1; /* Fold long lines */ | |
67 | int stop_opt = 1; /* Stop after form feeds */ | |
68 | int promptlen; | |
69 | int Currline; /* Line we are currently at */ | |
70 | int startup = 1; | |
71 | int firstf = 1; | |
72 | int notell = 1; | |
73 | int bad_so; /* True if overwriting does not turn off standout */ | |
74 | int inwait, Pause, errors; | |
75 | int within; /* true if we are within a file, | |
76 | false if we are between files */ | |
77 | int hard, dumb, noscroll, hardtabs; | |
78 | int catch_susp; /* We should catch the SIGTSTP signal */ | |
79 | char **fnames; /* The list of file names */ | |
80 | int nfiles; /* Number of files left to process */ | |
81 | char *shell; /* The name of the shell to use */ | |
82 | int shellp; /* A previous shell command exists */ | |
83 | char ch; | |
84 | jmp_buf restore; | |
85 | char obuf[BUFSIZ]; /* stdout buffer */ | |
86 | char Line[LINSIZ]; /* Line buffer */ | |
87 | int Lpp = 24; /* lines per page */ | |
88 | char *Clear; /* clear screen */ | |
89 | char *eraseln; /* erase line */ | |
90 | char *Senter, *Sexit;/* enter and exit standout mode */ | |
91 | char *tgetstr(); | |
92 | int Mcol = 80; /* number of columns */ | |
93 | int Wrap = 1; /* set if automargins */ | |
94 | long fseek(); | |
95 | struct { | |
96 | long chrctr, line; | |
97 | } context, screen_start; | |
98 | extern char PC; /* pad character */ | |
99 | extern short ospeed; | |
100 | ||
101 | ||
102 | main(argc, argv) | |
103 | int argc; | |
104 | char *argv[]; | |
105 | { | |
106 | register FILE *f; | |
107 | register char *s; | |
108 | register char *p; | |
109 | register char ch; | |
110 | register int left; | |
111 | int prnames = 0; | |
112 | int initopt = 0; | |
113 | int srchopt = 0; | |
114 | int clearit = 0; | |
115 | int initline; | |
116 | char initbuf[80]; | |
117 | FILE *checkf(); | |
118 | ||
119 | nfiles = argc; | |
120 | fnames = argv; | |
121 | initterm (); | |
122 | while (--nfiles > 0) { | |
123 | if ((ch = (*++fnames)[0]) == '-') { | |
124 | for (s = fnames[0] + 1, dlines = 0; *s != '\0'; s++) | |
125 | if (isdigit(*s)) | |
126 | dlines = dlines*10 + *s - '0'; | |
127 | else if (*s == 'd') | |
128 | dum_opt = 1; | |
129 | else if (*s == 'l') | |
130 | stop_opt = 0; | |
131 | else if (*s == 'f') | |
132 | fold_opt = 0; | |
133 | } | |
134 | else if (ch == '+') { | |
135 | s = *fnames; | |
136 | if (*++s == '/') { | |
137 | srchopt++; | |
138 | for (++s, p = initbuf; p < initbuf + 79 && *s != '\0';) | |
139 | *p++ = *s++; | |
140 | *p = '\0'; | |
141 | } | |
142 | else { | |
143 | initopt++; | |
144 | for (initline = 0; *s != '\0'; s++) | |
145 | if (isdigit (*s)) | |
146 | initline = initline*10 + *s -'0'; | |
147 | --initline; | |
148 | } | |
149 | } | |
150 | else break; | |
151 | } | |
152 | if (dlines == 0) | |
153 | dlines = Lpp - (noscroll ? 1 : 2); | |
154 | left = dlines; | |
155 | if (nfiles > 1) | |
156 | prnames++; | |
157 | if (!no_intty && nfiles == 0) { | |
158 | fputs("Usage: ",stderr); | |
159 | fputs(argv[0],stderr); | |
160 | fputs(" [-dfln] [+linenum | +/pattern] name1 name2 ...\n",stderr); | |
161 | exit(1); | |
162 | } | |
163 | else | |
164 | f = stdin; | |
165 | if (!no_tty) { | |
166 | signal(SIGQUIT, onquit); | |
167 | signal(SIGINT, end_it); | |
168 | #ifdef SIGTSTP | |
169 | if (signal (SIGTSTP, SIG_IGN) == SIG_DFL) { | |
170 | signal(SIGTSTP, onsusp); | |
171 | catch_susp++; | |
172 | } | |
173 | #endif | |
174 | stty (2, &otty); | |
175 | } | |
176 | if (no_intty) { | |
177 | if (no_tty) | |
178 | copy_file (stdin); | |
179 | else { | |
180 | if ((ch = Getc (f)) == '\f') | |
181 | doclear (); | |
182 | else { | |
183 | Ungetc (ch, f); | |
184 | if (noscroll) | |
185 | doclear (); | |
186 | } | |
187 | if (srchopt) | |
188 | search (initbuf, stdin, 1); | |
189 | else if (initopt) | |
190 | skiplns (initline, stdin); | |
191 | screen (stdin, left); | |
192 | } | |
193 | no_intty = 0; | |
194 | prnames++; | |
195 | firstf = 0; | |
196 | } | |
197 | ||
198 | while (fnum < nfiles) { | |
199 | if ((f = checkf (fnames[fnum], &clearit)) != NULL) { | |
200 | context.line = context.chrctr = 0; | |
201 | Currline = 0; | |
202 | if (firstf) setjmp (restore); | |
203 | if (firstf) { | |
204 | firstf = 0; | |
205 | if (srchopt) | |
206 | search (initbuf, f, 1); | |
207 | else if (initopt) | |
208 | skiplns (initline, f); | |
209 | } | |
210 | else if (fnum < nfiles && !no_tty) { | |
211 | setjmp (restore); | |
212 | left = command (fnames[fnum], f); | |
213 | } | |
214 | if (left != 0) { | |
215 | if (noscroll || clearit) | |
216 | doclear (); | |
217 | if (prnames) { | |
218 | if (bad_so) | |
219 | erase (0); | |
220 | pr("::::::::::::::"); | |
221 | if (promptlen > 14) | |
222 | erase (14); | |
223 | printf ("\n%s\n::::::::::::::\n", fnames[fnum]); | |
224 | if (left > Lpp - 4) | |
225 | left = Lpp - 4; | |
226 | } | |
227 | if (no_tty) | |
228 | copy_file (f); | |
229 | else { | |
230 | within++; | |
231 | screen(f, left); | |
232 | within = 0; | |
233 | } | |
234 | } | |
235 | setjmp (restore); | |
236 | fflush(stdout); | |
237 | fclose(f); | |
238 | screen_start.line = screen_start.chrctr = 0L; | |
239 | context.line = context.chrctr = 0L; | |
240 | } | |
241 | fnum++; | |
242 | firstf = 0; | |
243 | } | |
244 | reset_tty (); | |
245 | exit(0); | |
246 | } | |
247 | ||
248 | /* | |
249 | ** Check whether the file named by fs is an ASCII file which the user may | |
250 | ** access. If it is, return the opened file. Otherwise return NULL. | |
251 | */ | |
252 | ||
253 | FILE * | |
254 | checkf (fs, clearfirst) | |
255 | register char *fs; | |
256 | int *clearfirst; | |
257 | { | |
258 | struct stat stbuf; | |
259 | register FILE *f; | |
260 | char c; | |
261 | ||
262 | if (stat (fs, &stbuf) == -1) { | |
263 | fflush(stdout); | |
264 | perror(fs); | |
265 | return (NULL); | |
266 | } | |
267 | if ((stbuf.st_mode & S_IFMT) == S_IFDIR) { | |
268 | printf("\n*** %s: directory ***\n\n", fs); | |
269 | return (NULL); | |
270 | } | |
271 | if ((f=Fopen(fs, "r")) == NULL) { | |
272 | fflush(stdout); | |
273 | perror(fs); | |
274 | return (NULL); | |
275 | } | |
276 | c = Getc(f); | |
277 | ||
278 | /* Try to see whether it is an ASCII file */ | |
279 | ||
280 | switch ((c | *f->_ptr << 8) & 0177777) { | |
281 | case 0405: | |
282 | case 0407: | |
283 | case 0410: | |
284 | case 0411: | |
285 | case 0413: | |
286 | case 0177545: | |
287 | printf("\n******** %s: Not a text file ********\n\n", fs); | |
288 | fclose (f); | |
289 | return (NULL); | |
290 | default: | |
291 | break; | |
292 | } | |
293 | if (c == '\f') | |
294 | *clearfirst = 1; | |
295 | else { | |
296 | *clearfirst = 0; | |
297 | Ungetc (c, f); | |
298 | } | |
299 | if ((file_size = stbuf.st_size) == 0) | |
300 | file_size = 0x7fffffffffffffffL; | |
301 | return (f); | |
302 | } | |
303 | ||
304 | /* | |
305 | ** A real function, for the tputs routine in termlib | |
306 | */ | |
307 | ||
308 | putch (ch) | |
309 | char ch; | |
310 | { | |
311 | putchar (ch); | |
312 | } | |
313 | ||
314 | /* | |
315 | ** Print out the contents of the file f, one screenful at a time. | |
316 | */ | |
317 | ||
318 | #define STOP -10 | |
319 | ||
320 | screen (f, num_lines) | |
321 | register FILE *f; | |
322 | register int num_lines; | |
323 | { | |
324 | register int c; | |
325 | register int nchars; | |
326 | int length; | |
327 | ||
328 | for (;;) { | |
329 | while (num_lines > 0 && !Pause) { | |
330 | if ((nchars = getline (f, &length)) == EOF) | |
331 | return; | |
332 | if (bad_so || (Senter && *Senter == ' ') && promptlen > 0) | |
333 | erase (0); | |
334 | prbuf (Line, length); | |
335 | if (nchars < promptlen) | |
336 | erase (nchars); /* erase () sets promptlen to 0 */ | |
337 | else promptlen = 0; | |
338 | if (nchars < Mcol || !fold_opt) | |
339 | putchar('\n'); | |
340 | if (nchars == STOP) | |
341 | break; | |
342 | num_lines--; | |
343 | } | |
344 | fflush(stdout); | |
345 | if ((c = Getc(f)) == EOF) | |
346 | return; | |
347 | Ungetc (c, f); | |
348 | setjmp (restore); | |
349 | Pause = 0; startup = 0; | |
350 | if ((num_lines = command (NULL, f)) == 0) | |
351 | return; | |
352 | if (hard && promptlen > 0) | |
353 | erase (0); | |
354 | if (noscroll && num_lines == dlines) | |
355 | doclear (); | |
356 | screen_start.line = Currline; | |
357 | screen_start.chrctr = Ftell (f); | |
358 | } | |
359 | } | |
360 | ||
361 | /* | |
362 | ** Come here if a quit signal is received | |
363 | */ | |
364 | ||
365 | onquit() | |
366 | { | |
367 | signal(SIGQUIT, SIG_IGN); | |
368 | if (!inwait) { | |
369 | putchar ('\n'); | |
370 | if (!startup) { | |
371 | signal(SIGQUIT, onquit); | |
372 | longjmp (restore, 1); | |
373 | } | |
374 | else | |
375 | Pause++; | |
376 | } | |
377 | else if (!dum_opt && notell) { | |
378 | write (2, "[Use q or Q to quit]", 20); | |
379 | promptlen += 20; | |
380 | notell = 0; | |
381 | } | |
382 | signal(SIGQUIT, onquit); | |
383 | } | |
384 | ||
385 | /* | |
386 | ** Clean up terminal state and exit. Also come here if interrupt signal received | |
387 | */ | |
388 | ||
389 | end_it () | |
390 | { | |
391 | ||
392 | reset_tty (); | |
393 | if (promptlen > 0) { | |
394 | kill_line (); | |
395 | fflush (stdout); | |
396 | } | |
397 | else | |
398 | write (2, "\n", 1); | |
399 | _exit(0); | |
400 | } | |
401 | ||
402 | copy_file(f) | |
403 | register FILE *f; | |
404 | { | |
405 | register int c; | |
406 | ||
407 | while ((c = getc(f)) != EOF) | |
408 | putchar(c); | |
409 | } | |
410 | ||
411 | /* Simplified printf function */ | |
412 | ||
413 | printf (fmt, args) | |
414 | register char *fmt; | |
415 | int args; | |
416 | { | |
417 | register int *argp; | |
418 | register char ch; | |
419 | register int ccount; | |
420 | ||
421 | ccount = 0; | |
422 | argp = &args; | |
423 | while (*fmt) { | |
424 | while ((ch = *fmt++) != '%') { | |
425 | if (ch == '\0') | |
426 | return (ccount); | |
427 | ccount++; | |
428 | putchar (ch); | |
429 | } | |
430 | switch (*fmt++) { | |
431 | case 'd': | |
432 | ccount += printd (*argp); | |
433 | break; | |
434 | case 's': | |
435 | ccount += pr ((char *)*argp); | |
436 | break; | |
437 | case '%': | |
438 | ccount++; | |
439 | argp--; | |
440 | putchar ('%'); | |
441 | break; | |
442 | case '0': | |
443 | return (ccount); | |
444 | default: | |
445 | break; | |
446 | } | |
447 | ++argp; | |
448 | } | |
449 | return (ccount); | |
450 | ||
451 | } | |
452 | ||
453 | /* | |
454 | ** Print an integer as a string of decimal digits, | |
455 | ** returning the length of the print representation. | |
456 | */ | |
457 | ||
458 | printd (n) | |
459 | int n; | |
460 | { | |
461 | int a, nchars; | |
462 | ||
463 | if (a = n/10) | |
464 | nchars = 1 + printd(a); | |
465 | else | |
466 | nchars = 1; | |
467 | putchar (n % 10 + '0'); | |
468 | return (nchars); | |
469 | } | |
470 | ||
471 | /* Put the print representation of an integer into a string */ | |
472 | static char *sptr; | |
473 | ||
474 | scanstr (n, str) | |
475 | int n; | |
476 | char *str; | |
477 | { | |
478 | sptr = str; | |
479 | sprintf (n); | |
480 | *sptr = '\0'; | |
481 | } | |
482 | ||
483 | sprintf (n) | |
484 | { | |
485 | int a; | |
486 | ||
487 | if (a = n/10) | |
488 | sprintf (a); | |
489 | *sptr++ = n % 10 + '0'; | |
490 | } | |
491 | ||
492 | static char bell = ctrl(G); | |
493 | ||
494 | strlen (s) | |
495 | char *s; | |
496 | { | |
497 | register char *p; | |
498 | ||
499 | p = s; | |
500 | while (*p++) | |
501 | ; | |
502 | return (p - s - 1); | |
503 | } | |
504 | ||
505 | /* See whether the last component of the path name "path" is equal to the | |
506 | ** string "string" | |
507 | */ | |
508 | ||
509 | tailequ (path, string) | |
510 | char *path; | |
511 | register char *string; | |
512 | { | |
513 | register char *tail; | |
514 | ||
515 | tail = path + strlen(path); | |
516 | while (tail >= path) | |
517 | if (*(--tail) == '/') | |
518 | break; | |
519 | ++tail; | |
520 | while (*tail++ == *string++) | |
521 | if (*tail == '\0') | |
522 | return(1); | |
523 | return(0); | |
524 | } | |
525 | ||
526 | prompt (filename) | |
527 | char *filename; | |
528 | { | |
529 | if (promptlen > 0) | |
530 | kill_line (); | |
531 | if (!hard) { | |
532 | promptlen = 8; | |
533 | if (Senter && Sexit) | |
534 | tputs (Senter, 1, putch); | |
535 | pr("--More--"); | |
536 | if (filename != NULL) { | |
537 | promptlen += printf ("(Next file: %s)", filename); | |
538 | } | |
539 | else if (!no_intty) { | |
540 | promptlen += printf ("(%d%%)", (int)((file_pos * 100) / file_size)); | |
541 | } | |
542 | if (dum_opt) { | |
543 | promptlen += pr("[Hit space to continue, Rubout to abort]"); | |
544 | } | |
545 | if (Senter && Sexit) | |
546 | tputs (Sexit, 1, putch); | |
547 | fflush(stdout); | |
548 | } | |
549 | else | |
550 | write (2, &bell, 1); | |
551 | inwait++; | |
552 | } | |
553 | ||
554 | /* | |
555 | ** Get a logical line | |
556 | */ | |
557 | ||
558 | getline(f, length) | |
559 | register FILE *f; | |
560 | int *length; | |
561 | { | |
562 | register int c; | |
563 | register char *p; | |
564 | register int column; | |
565 | static int colflg; | |
566 | ||
567 | p = Line; | |
568 | column = 0; | |
569 | c = Getc (f); | |
570 | if (colflg && c == '\n') { | |
571 | Currline++; | |
572 | c = Getc (f); | |
573 | } | |
574 | while (p < &Line[LINSIZ - 1]) { | |
575 | if (c == EOF) { | |
576 | if (p > Line) { | |
577 | *p = '\0'; | |
578 | *length = p - Line; | |
579 | return (column); | |
580 | } | |
581 | *length = p - Line; | |
582 | return (EOF); | |
583 | } | |
584 | if (c == '\n') { | |
585 | Currline++; | |
586 | break; | |
587 | } | |
588 | *p++ = c; | |
589 | if (c == '\t') | |
590 | if (hardtabs && column < promptlen && !hard) { | |
591 | if (eraseln && !dumb) { | |
592 | column = 1 + (column | 7); | |
593 | tputs (eraseln, 1, putch); | |
594 | promptlen = 0; | |
595 | } | |
596 | else { | |
597 | for (--p; column & 7 && p < &Line[LINSIZ - 1]; column++) { | |
598 | *p++ = ' '; | |
599 | } | |
600 | if (column >= promptlen) promptlen = 0; | |
601 | } | |
602 | } | |
603 | else | |
604 | column = 1 + (column | 7); | |
605 | else if (c == '\b') | |
606 | column--; | |
607 | else if (c == '\r') | |
608 | column = 0; | |
609 | else if (c == '\f' && stop_opt) { | |
610 | p[-1] = '^'; | |
611 | *p++ = 'L'; | |
612 | column += 2; | |
613 | Pause++; | |
614 | } | |
615 | else if (c == EOF) { | |
616 | *length = p - Line; | |
617 | return (column); | |
618 | } | |
619 | else if (c >= ' ' && c != RUBOUT) | |
620 | column++; | |
621 | if (column >= Mcol && fold_opt) break; | |
622 | c = Getc (f); | |
623 | } | |
624 | if (column >= Mcol && Mcol > 0) { | |
625 | if (!Wrap) { | |
626 | *p++ = '\n'; | |
627 | } | |
628 | } | |
629 | colflg = column == Mcol && fold_opt; | |
630 | *length = p - Line; | |
631 | *p = 0; | |
632 | return (column); | |
633 | } | |
634 | ||
635 | /* | |
636 | ** Erase the rest of the prompt, assuming we are starting at column col. | |
637 | */ | |
638 | ||
639 | erase (col) | |
640 | register int col; | |
641 | { | |
642 | ||
643 | if (promptlen == 0) | |
644 | return; | |
645 | if (hard) { | |
646 | putchar ('\n'); | |
647 | } | |
648 | else { | |
649 | if (col == 0) | |
650 | putchar ('\r'); | |
651 | if (!dumb && eraseln) | |
652 | tputs (eraseln, 1, putch); | |
653 | else | |
654 | for (col = promptlen - col; col > 0; col--) | |
655 | putchar (' '); | |
656 | } | |
657 | promptlen = 0; | |
658 | } | |
659 | ||
660 | /* | |
661 | ** Erase the current line entirely | |
662 | */ | |
663 | ||
664 | kill_line () | |
665 | { | |
666 | erase (0); | |
667 | if (!eraseln || dumb) putchar ('\r'); | |
668 | } | |
669 | ||
670 | /* | |
671 | ** Print string and return number of characters | |
672 | */ | |
673 | ||
674 | pr(s1) | |
675 | char *s1; | |
676 | { | |
677 | register char *s; | |
678 | register char c; | |
679 | ||
680 | for (s = s1; c = *s++; ) | |
681 | putchar(c); | |
682 | return (s - s1 - 1); | |
683 | } | |
684 | ||
685 | ||
686 | /* Print a buffer of n characters */ | |
687 | ||
688 | prbuf (s, n) | |
689 | register char *s; | |
690 | register int n; | |
691 | { | |
692 | while (n-- > 0) | |
693 | putchar (*s++); | |
694 | } | |
695 | ||
696 | /* | |
697 | ** Clear the screen | |
698 | */ | |
699 | ||
700 | doclear() | |
701 | { | |
702 | if (Clear && !hard) { | |
703 | tputs(Clear, 1, putch); | |
704 | ||
705 | /* Put out carriage return so that system doesn't | |
706 | ** get confused by escape sequences when expanding tabs | |
707 | */ | |
708 | putchar ('\r'); | |
709 | promptlen = 0; | |
710 | } | |
711 | } | |
712 | ||
713 | static int lastcmd, lastarg, lastp; | |
714 | static int lastcolon; | |
715 | char shell_line[132]; | |
716 | ||
717 | /* | |
718 | ** Read a command and do it. A command consists of an optional integer | |
719 | ** argument followed by the command character. Return the number of lines | |
720 | ** to display in the next screenful. If there is nothing more to display | |
721 | ** in the current file, zero is returned. | |
722 | */ | |
723 | ||
724 | command (filename, f) | |
725 | char *filename; | |
726 | register FILE *f; | |
727 | { | |
728 | register int nlines; | |
729 | register int retval; | |
730 | register char c; | |
731 | char colonch; | |
732 | FILE *helpf; | |
733 | int done; | |
734 | char comchar, cmdbuf[80], *p; | |
735 | ||
736 | #define ret(val) retval=val;done++;break | |
737 | ||
738 | done = 0; | |
739 | if (!errors) | |
740 | prompt (filename); | |
741 | else | |
742 | errors = 0; | |
743 | if (MBIT == RAW && slow_tty) { | |
744 | otty.sg_flags |= MBIT; | |
745 | stty(2, &otty); | |
746 | } | |
747 | for (;;) { | |
748 | nlines = number (&comchar); | |
749 | lastp = colonch = 0; | |
750 | if (comchar == '.') { /* Repeat last command */ | |
751 | lastp++; | |
752 | comchar = lastcmd; | |
753 | nlines = lastarg; | |
754 | if (lastcmd == ':') | |
755 | colonch = lastcolon; | |
756 | } | |
757 | lastcmd = comchar; | |
758 | lastarg = nlines; | |
759 | if (comchar == otty.sg_erase) { | |
760 | kill_line (); | |
761 | prompt (filename); | |
762 | continue; | |
763 | } | |
764 | switch (comchar) { | |
765 | case ':': | |
766 | retval = colon (filename, colonch, nlines); | |
767 | if (retval >= 0) | |
768 | done++; | |
769 | break; | |
770 | case ' ': | |
771 | case 'z': | |
772 | if (nlines == 0) nlines = dlines; | |
773 | else if (comchar == 'z') dlines = nlines; | |
774 | ret (nlines); | |
775 | case 'd': | |
776 | case ctrl(D): | |
777 | if (nlines != 0) nscroll = nlines; | |
778 | ret (nscroll); | |
779 | case RUBOUT: | |
780 | case 'q': | |
781 | case 'Q': | |
782 | end_it (); | |
783 | case 's': | |
784 | case 'f': | |
785 | if (nlines == 0) nlines++; | |
786 | if (comchar == 'f') | |
787 | nlines *= dlines; | |
788 | putchar ('\r'); | |
789 | erase (0); | |
790 | printf("\n...skipping %d line", nlines); | |
791 | if (nlines > 1) | |
792 | pr("s\n\n"); | |
793 | else | |
794 | pr("\n\n"); | |
795 | while (nlines > 0) { | |
796 | while ((c = Getc (f)) != '\n') | |
797 | if (c == EOF) { | |
798 | retval = 0; | |
799 | done++; | |
800 | goto endsw; | |
801 | } | |
802 | Currline++; | |
803 | nlines--; | |
804 | } | |
805 | ret (dlines); | |
806 | case '\n': | |
807 | if (nlines != 0) | |
808 | dlines = nlines; | |
809 | else | |
810 | nlines = 1; | |
811 | ret (nlines); | |
812 | case '\f': | |
813 | if (!no_intty) { | |
814 | doclear (); | |
815 | Fseek (f, screen_start.chrctr); | |
816 | Currline = screen_start.line; | |
817 | ret (dlines); | |
818 | } | |
819 | else { | |
820 | write (2, &bell, 1); | |
821 | break; | |
822 | } | |
823 | case '\'': | |
824 | if (!no_intty) { | |
825 | kill_line (); | |
826 | pr ("\n***Back***\n\n"); | |
827 | Fseek (f, context.chrctr); | |
828 | Currline = context.line; | |
829 | ret (dlines); | |
830 | } | |
831 | else { | |
832 | write (2, &bell, 1); | |
833 | break; | |
834 | } | |
835 | case '=': | |
836 | kill_line (); | |
837 | promptlen = printd (Currline); | |
838 | fflush (stdout); | |
839 | break; | |
840 | case 'n': | |
841 | lastp++; | |
842 | case '/': | |
843 | if (nlines == 0) nlines++; | |
844 | kill_line (); | |
845 | pr ("/"); | |
846 | promptlen = 1; | |
847 | fflush (stdout); | |
848 | if (lastp) { | |
849 | write (2,"\r", 1); | |
850 | search (NULL, f, nlines); /* Use previous r.e. */ | |
851 | } | |
852 | else { | |
853 | ttyin (cmdbuf, 78, '/'); | |
854 | write (2, "\r", 1); | |
855 | search (cmdbuf, f, nlines); | |
856 | } | |
857 | ret (dlines); | |
858 | case '!': | |
859 | do_shell (filename); | |
860 | break; | |
861 | case 'h': | |
862 | if ((helpf = fopen (HELPFILE, "r")) == NULL) | |
863 | error ("Can't open help file"); | |
864 | if (noscroll) doclear (); | |
865 | copy_file (helpf); | |
866 | close (helpf); | |
867 | prompt (filename); | |
868 | break; | |
869 | case 'v': /* This case should go right before default */ | |
870 | if (!no_intty) { | |
871 | kill_line (); | |
872 | cmdbuf[0] = '+'; | |
873 | scanstr (Currline, &cmdbuf[1]); | |
874 | pr ("vi "); pr (cmdbuf); putchar (' '); pr (fnames[fnum]); | |
875 | execute (filename, VI, "vi", cmdbuf, fnames[fnum], 0); | |
876 | break; | |
877 | } | |
878 | default: | |
879 | write (2, &bell, 1); | |
880 | break; | |
881 | } | |
882 | if (done) break; | |
883 | } | |
884 | putchar ('\r'); | |
885 | endsw: | |
886 | inwait = 0; | |
887 | notell++; | |
888 | if (MBIT == RAW && slow_tty) { | |
889 | otty.sg_flags &= ~MBIT; | |
890 | stty(2, &otty); | |
891 | } | |
892 | return (retval); | |
893 | } | |
894 | ||
895 | char ch; | |
896 | ||
897 | /* | |
898 | * Execute a colon-prefixed command. | |
899 | * Returns <0 if not a command that should cause | |
900 | * more of the file to be printed. | |
901 | */ | |
902 | ||
903 | colon (filename, cmd, nlines) | |
904 | char *filename; | |
905 | int cmd; | |
906 | int nlines; | |
907 | { | |
908 | if (cmd == 0) | |
909 | ch = readch (); | |
910 | else | |
911 | ch = cmd; | |
912 | lastcolon = ch; | |
913 | switch (ch) { | |
914 | case 'f': | |
915 | kill_line (); | |
916 | if (!no_intty) | |
917 | promptlen = printf ("\"%s\" line %d", fnames[fnum], Currline); | |
918 | else | |
919 | promptlen = printf ("[Not a file] line %d", Currline); | |
920 | fflush (stdout); | |
921 | return (-1); | |
922 | case 'n': | |
923 | if (nlines == 0) { | |
924 | if (fnum >= nfiles - 1) | |
925 | end_it (); | |
926 | nlines++; | |
927 | } | |
928 | putchar ('\r'); | |
929 | erase (0); | |
930 | skipf (nlines); | |
931 | return (0); | |
932 | case 'p': | |
933 | if (no_intty) { | |
934 | write (2, &bell, 1); | |
935 | return (-1); | |
936 | } | |
937 | putchar ('\r'); | |
938 | erase (0); | |
939 | if (nlines == 0) | |
940 | nlines++; | |
941 | skipf (-nlines); | |
942 | return (0); | |
943 | case '!': | |
944 | do_shell (filename); | |
945 | return (-1); | |
946 | case 'q': | |
947 | case 'Q': | |
948 | end_it (); | |
949 | default: | |
950 | write (2, &bell, 1); | |
951 | return (-1); | |
952 | } | |
953 | } | |
954 | ||
955 | /* | |
956 | ** Read a decimal number from the terminal. Set cmd to the non-digit which | |
957 | ** terminates the number. | |
958 | */ | |
959 | ||
960 | number(cmd) | |
961 | char *cmd; | |
962 | { | |
963 | register int i; | |
964 | ||
965 | i = 0; ch = otty.sg_kill; | |
966 | for (;;) { | |
967 | ch = readch (); | |
968 | if (ch >= '0' && ch <= '9') | |
969 | i = i*10 + ch - '0'; | |
970 | else if (ch == otty.sg_kill) | |
971 | i = 0; | |
972 | else { | |
973 | *cmd = ch; | |
974 | break; | |
975 | } | |
976 | } | |
977 | return (i); | |
978 | } | |
979 | ||
980 | do_shell (filename) | |
981 | char *filename; | |
982 | { | |
983 | char cmdbuf[80]; | |
984 | ||
985 | kill_line (); | |
986 | pr ("!"); | |
987 | fflush (stdout); | |
988 | promptlen = 1; | |
989 | if (lastp) | |
990 | pr (shell_line); | |
991 | else { | |
992 | ttyin (cmdbuf, 78, '!'); | |
993 | if (expand (shell_line, cmdbuf)) { | |
994 | kill_line (); | |
995 | promptlen = printf ("!%s", shell_line); | |
996 | } | |
997 | } | |
998 | fflush (stdout); | |
999 | write (2, "\n", 1); | |
1000 | promptlen = 0; | |
1001 | shellp = 1; | |
1002 | execute (filename, shell, shell, "-c", shell_line, 0); | |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | ** Search for nth ocurrence of regular expression contained in buf in the file | |
1007 | */ | |
1008 | ||
1009 | search (buf, file, n) | |
1010 | char buf[]; | |
1011 | FILE *file; | |
1012 | register int n; | |
1013 | { | |
1014 | long startline = Ftell (file); | |
1015 | register long line1 = startline; | |
1016 | register long line2 = startline; | |
1017 | register long line3 = startline; | |
1018 | register int lncount; | |
1019 | int saveln, rv, re_exec(); | |
1020 | char *s, *re_comp(); | |
1021 | ||
1022 | context.line = saveln = Currline; | |
1023 | context.chrctr = startline; | |
1024 | lncount = 0; | |
1025 | if ((s = re_comp (buf)) != 0) | |
1026 | error (s); | |
1027 | while (!feof (file)) { | |
1028 | line3 = line2; | |
1029 | line2 = line1; | |
1030 | line1 = Ftell (file); | |
1031 | rdline (file); | |
1032 | lncount++; | |
1033 | if ((rv = re_exec (Line)) == 1) | |
1034 | if (--n == 0) { | |
1035 | if (lncount > 3 || (lncount > 1 && no_intty)) | |
1036 | pr ("\n...skipping\n"); | |
1037 | if (!no_intty) { | |
1038 | Currline -= (lncount >= 3 ? 3 : lncount); | |
1039 | Fseek (file, line3); | |
1040 | } | |
1041 | else { | |
1042 | kill_line (); | |
1043 | pr (Line); | |
1044 | putchar ('\n'); | |
1045 | } | |
1046 | break; | |
1047 | } | |
1048 | else if (rv == -1) | |
1049 | error ("Regular expression botch"); | |
1050 | } | |
1051 | if (feof (file)) { | |
1052 | if (!no_intty) { | |
1053 | #ifdef V6 | |
1054 | file->_flag &= ~_IOEOF; /* why doesn't fseek do this ??!!??! */ | |
1055 | #endif | |
1056 | Currline = saveln; | |
1057 | Fseek (file, startline); | |
1058 | } | |
1059 | else { | |
1060 | pr ("\nPattern not found\n"); | |
1061 | end_it (); | |
1062 | } | |
1063 | error ("Pattern not found"); | |
1064 | } | |
1065 | } | |
1066 | ||
1067 | execute (filename, cmd, args) | |
1068 | char *filename; | |
1069 | char *cmd, *args; | |
1070 | { | |
1071 | int id; | |
1072 | ||
1073 | fflush (stdout); | |
1074 | reset_tty (); | |
1075 | while ((id = fork ()) < 0) | |
1076 | sleep (5); | |
1077 | if (id == 0) { | |
1078 | execv (cmd, &args); | |
1079 | write (2, "exec failed\n", 12); | |
1080 | exit (1); | |
1081 | } | |
1082 | signal (SIGINT, SIG_IGN); | |
1083 | signal (SIGQUIT, SIG_IGN); | |
1084 | #ifdef SIGTSTP | |
1085 | if (catch_susp) | |
1086 | signal(SIGTSTP, SIG_DFL); | |
1087 | #endif | |
1088 | wait (0); | |
1089 | signal (SIGINT, end_it); | |
1090 | signal (SIGQUIT, onquit); | |
1091 | #ifdef SIGTSTP | |
1092 | if (catch_susp) | |
1093 | signal(SIGTSTP, onsusp); | |
1094 | #endif | |
1095 | set_tty (); | |
1096 | pr ("------------------------\n"); | |
1097 | prompt (filename); | |
1098 | } | |
1099 | /* | |
1100 | ** Skip n lines in the file f | |
1101 | */ | |
1102 | ||
1103 | skiplns (n, f) | |
1104 | register int n; | |
1105 | register FILE *f; | |
1106 | { | |
1107 | register char c; | |
1108 | ||
1109 | while (n > 0) { | |
1110 | while ((c = Getc (f)) != '\n') | |
1111 | if (c == EOF) | |
1112 | return; | |
1113 | n--; | |
1114 | Currline++; | |
1115 | } | |
1116 | } | |
1117 | ||
1118 | /* | |
1119 | ** Skip nskip files in the file list (from the command line). Nskip may be | |
1120 | ** negative. | |
1121 | */ | |
1122 | ||
1123 | skipf (nskip) | |
1124 | register int nskip; | |
1125 | { | |
1126 | if (nskip == 0) return; | |
1127 | if (nskip > 0) { | |
1128 | if (fnum + nskip > nfiles - 1) | |
1129 | nskip = nfiles - fnum - 1; | |
1130 | } | |
1131 | else if (within) | |
1132 | ++fnum; | |
1133 | fnum += nskip; | |
1134 | if (fnum < 0) | |
1135 | fnum = 0; | |
1136 | pr ("\n...Skipping "); | |
1137 | pr (nskip > 0 ? "to file " : "back to file "); | |
1138 | pr (fnames[fnum]); | |
1139 | pr ("\n\n"); | |
1140 | --fnum; | |
1141 | } | |
1142 | ||
1143 | /*----------------------------- Terminal I/O -------------------------------*/ | |
1144 | ||
1145 | initterm () | |
1146 | { | |
1147 | char buf[TBUFSIZ]; | |
1148 | char clearbuf[100]; | |
1149 | char *clearptr, *padstr; | |
1150 | char *getenv(); | |
1151 | int ldisc; | |
1152 | ||
1153 | setbuf(stdout, obuf); | |
1154 | if (!(no_tty = gtty(1, &otty))) { | |
1155 | if (tgetent(buf, getenv("TERM")) <= 0) { | |
1156 | dumb++; | |
1157 | } | |
1158 | else { | |
1159 | if (((Lpp = tgetnum("li")) < 0) || tgetflag("hc")) { | |
1160 | hard++; /* Hard copy terminal */ | |
1161 | Lpp = 24; | |
1162 | } | |
1163 | if (tailequ (fnames[0], "page") || !hard && tgetflag("ns")) | |
1164 | noscroll++; | |
1165 | if ((Mcol = tgetnum("co")) < 0) | |
1166 | Mcol = 80; | |
1167 | Wrap = tgetflag("am"); | |
1168 | bad_so = tgetflag ("xs"); | |
1169 | clearptr = clearbuf; | |
1170 | eraseln = tgetstr("ce",&clearptr); | |
1171 | Clear = tgetstr("cl", &clearptr); | |
1172 | Senter = tgetstr("so", &clearptr); | |
1173 | Sexit = tgetstr("se", &clearptr); | |
1174 | if (padstr = tgetstr("pc", &clearptr)) | |
1175 | PC = *padstr; | |
1176 | } | |
1177 | if ((shell = getenv("SHELL")) == NULL) | |
1178 | shell = "/bin/sh"; | |
1179 | } | |
1180 | no_intty = gtty(0, &otty); | |
1181 | gtty(2, &otty); | |
1182 | ospeed = otty.sg_ospeed; | |
1183 | slow_tty = ospeed < B1200; | |
1184 | hardtabs = !(otty.sg_flags & XTABS); | |
1185 | if (!no_tty) { | |
1186 | otty.sg_flags &= ~ECHO; | |
1187 | if (MBIT == CBREAK || !slow_tty) | |
1188 | otty.sg_flags |= MBIT; | |
1189 | } | |
1190 | } | |
1191 | ||
1192 | readch () | |
1193 | { | |
1194 | char ch; | |
1195 | extern int errno; | |
1196 | ||
1197 | if (read (2, &ch, 1) <= 0) | |
1198 | if (errno != EINTR) | |
1199 | exit(0); | |
1200 | else | |
1201 | ch = otty.sg_kill; | |
1202 | return (ch); | |
1203 | } | |
1204 | ||
1205 | static char BS = '\b'; | |
1206 | static char CARAT = '^'; | |
1207 | ||
1208 | ttyin (buf, nmax, pchar) | |
1209 | char buf[]; | |
1210 | register int nmax; | |
1211 | char pchar; | |
1212 | { | |
1213 | register char *sptr; | |
1214 | register char ch; | |
1215 | register int slash = 0; | |
1216 | int maxlen; | |
1217 | char cbuf; | |
1218 | ||
1219 | sptr = buf; | |
1220 | maxlen = 0; | |
1221 | while (sptr - buf < nmax) { | |
1222 | if (promptlen > maxlen) maxlen = promptlen; | |
1223 | ch = readch (); | |
1224 | if (ch == '\\') { | |
1225 | slash++; | |
1226 | } | |
1227 | else if ((ch == otty.sg_erase) && !slash) { | |
1228 | if (sptr > buf) { | |
1229 | --promptlen; | |
1230 | write (2, &BS, 1); | |
1231 | --sptr; | |
1232 | if ((*sptr < ' ' && *sptr != '\n') || *sptr == RUBOUT) { | |
1233 | --promptlen; | |
1234 | write (2, &BS, 1); | |
1235 | } | |
1236 | continue; | |
1237 | } | |
1238 | else { | |
1239 | if (!eraseln) promptlen = maxlen; | |
1240 | longjmp (restore, 1); | |
1241 | } | |
1242 | } | |
1243 | else if ((ch == otty.sg_kill) && !slash) { | |
1244 | if (hard) { | |
1245 | show (ch); | |
1246 | putchar ('\n'); | |
1247 | putchar (pchar); | |
1248 | } | |
1249 | else { | |
1250 | putchar ('\r'); | |
1251 | putchar (pchar); | |
1252 | if (eraseln) | |
1253 | erase (1); | |
1254 | promptlen = 1; | |
1255 | } | |
1256 | sptr = buf; | |
1257 | fflush (stdout); | |
1258 | continue; | |
1259 | } | |
1260 | if (slash && (ch == otty.sg_kill || ch == otty.sg_erase)) { | |
1261 | write (2, &BS, 1); | |
1262 | --sptr; | |
1263 | } | |
1264 | if (ch != '\\') | |
1265 | slash = 0; | |
1266 | *sptr++ = ch; | |
1267 | if ((ch < ' ' && ch != '\n' && ch != ESC) || ch == RUBOUT) { | |
1268 | ch += ch == RUBOUT ? -0100 : 0100; | |
1269 | write (2, &CARAT, 1); | |
1270 | promptlen++; | |
1271 | } | |
1272 | cbuf = ch; | |
1273 | if (ch != '\n' && ch != ESC) { | |
1274 | write (2, &cbuf, 1); | |
1275 | promptlen++; | |
1276 | } | |
1277 | else | |
1278 | break; | |
1279 | } | |
1280 | *--sptr = '\0'; | |
1281 | if (!eraseln) promptlen = maxlen; | |
1282 | if (sptr - buf >= nmax - 1) | |
1283 | error ("Line too long"); | |
1284 | } | |
1285 | ||
1286 | expand (outbuf, inbuf) | |
1287 | char *outbuf; | |
1288 | char *inbuf; | |
1289 | { | |
1290 | register char *instr; | |
1291 | register char *outstr; | |
1292 | register char ch; | |
1293 | char temp[200]; | |
1294 | int changed = 0; | |
1295 | ||
1296 | instr = inbuf; | |
1297 | outstr = temp; | |
1298 | while ((ch = *instr++) != '\0') | |
1299 | switch (ch) { | |
1300 | case '%': | |
1301 | if (!no_intty) { | |
1302 | strcpy (outstr, fnames[fnum]); | |
1303 | outstr += strlen (fnames[fnum]); | |
1304 | changed++; | |
1305 | } | |
1306 | else | |
1307 | *outstr++ = ch; | |
1308 | break; | |
1309 | case '!': | |
1310 | if (!shellp) | |
1311 | error ("No previous command to substitute for"); | |
1312 | strcpy (outstr, shell_line); | |
1313 | outstr += strlen (shell_line); | |
1314 | changed++; | |
1315 | break; | |
1316 | case '\\': | |
1317 | if (*instr == '%' || *instr == '!') { | |
1318 | *outstr++ = *instr++; | |
1319 | break; | |
1320 | } | |
1321 | default: | |
1322 | *outstr++ = ch; | |
1323 | } | |
1324 | *outstr++ = '\0'; | |
1325 | strcpy (outbuf, temp); | |
1326 | return (changed); | |
1327 | } | |
1328 | ||
1329 | show (ch) | |
1330 | register char ch; | |
1331 | { | |
1332 | char cbuf; | |
1333 | ||
1334 | if ((ch < ' ' && ch != '\n' && ch != ESC) || ch == RUBOUT) { | |
1335 | ch += ch == RUBOUT ? -0100 : 0100; | |
1336 | write (2, &CARAT, 1); | |
1337 | promptlen++; | |
1338 | } | |
1339 | cbuf = ch; | |
1340 | write (2, &cbuf, 1); | |
1341 | promptlen++; | |
1342 | } | |
1343 | ||
1344 | error (mess) | |
1345 | char *mess; | |
1346 | { | |
1347 | kill_line (); | |
1348 | promptlen += strlen (mess); | |
1349 | if (Senter && Sexit) { | |
1350 | tputs (Senter, 1, putch); | |
1351 | pr(mess); | |
1352 | tputs (Sexit, 1, putch); | |
1353 | } | |
1354 | else | |
1355 | pr (mess); | |
1356 | fflush(stdout); | |
1357 | errors++; | |
1358 | longjmp (restore, 1); | |
1359 | } | |
1360 | ||
1361 | ||
1362 | set_tty () | |
1363 | { | |
1364 | otty.sg_flags |= MBIT; | |
1365 | otty.sg_flags &= ~ECHO; | |
1366 | stty(2, &otty); | |
1367 | } | |
1368 | ||
1369 | reset_tty () | |
1370 | { | |
1371 | otty.sg_flags |= ECHO; | |
1372 | otty.sg_flags &= ~MBIT; | |
1373 | stty(2, &otty); | |
1374 | } | |
1375 | ||
1376 | rdline (f) | |
1377 | register FILE *f; | |
1378 | { | |
1379 | register char c; | |
1380 | register char *p; | |
1381 | ||
1382 | p = Line; | |
1383 | while ((c = Getc (f)) != '\n' && c != EOF && p - Line < LINSIZ - 1) | |
1384 | *p++ = c; | |
1385 | if (c == '\n') | |
1386 | Currline++; | |
1387 | *p = '\0'; | |
1388 | } | |
1389 | ||
1390 | /* Come here when we get a suspend signal from the terminal */ | |
1391 | ||
1392 | #ifdef SIGTSTP | |
1393 | onsusp () | |
1394 | { | |
1395 | reset_tty (); | |
1396 | fflush (stdout); | |
1397 | /* Send the TSTP signal to suspend our process group */ | |
1398 | kill (0, SIGTSTP); | |
1399 | /* Pause for station break */ | |
1400 | ||
1401 | /* We're back */ | |
1402 | signal (SIGTSTP, onsusp); | |
1403 | set_tty (); | |
1404 | if (inwait) | |
1405 | longjmp (restore); | |
1406 | } | |
1407 | #endif |