1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
|
/*
* Copyright (c) 1988 Mark Nudleman
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char sccsid[] = "@(#)command.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
#include <sys/param.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <less.h>
#include "pathnames.h"
#define NO_MCA 0
#define MCA_DONE 1
#define MCA_MORE 2
extern int erase_char, kill_char, werase_char;
extern int ispipe;
extern int sigs;
extern int quit_at_eof;
extern int hit_eof;
extern int sc_width;
extern int sc_height;
extern int sc_window;
extern int curr_ac;
extern int ac;
extern char **av;
extern int quitting;
extern int scroll;
extern int screen_trashed; /* The screen has been overwritten */
static char cmdbuf[120]; /* Buffer for holding a multi-char command */
static char *cp; /* Pointer into cmdbuf */
static int cmd_col; /* Current column of the multi-char command */
static int longprompt; /* if stat command instead of prompt */
static int mca; /* The multicharacter command (action) */
static int last_mca; /* The previous mca */
static int number; /* The number typed by the user */
static int wsearch; /* Search for matches (1) or non-matches (0) */
#define CMD_RESET cp = cmdbuf /* reset command buffer to empty */
#define CMD_EXEC lower_left(); flush()
/* backspace in command buffer. */
static
cmd_erase()
{
int c;
/*
* backspace past beginning of the string: this usually means
* abort the command.
*/
if (cp == cmdbuf)
return(1);
/* erase an extra character, for the carat. */
c = *--cp;
if (CONTROL_CHAR(c)) {
backspace();
--cmd_col;
}
backspace();
--cmd_col;
return(0);
}
/* set up the display to start a new multi-character command. */
start_mca(action, prompt)
int action;
char *prompt;
{
lower_left();
clear_eol();
putstr(prompt);
cmd_col = strlen(prompt);
mca = action;
}
/*
* process a single character of a multi-character command, such as
* a number, or the pattern of a search command.
*/
static
cmd_char(c)
int c;
{
if (c == erase_char)
return(cmd_erase());
/* in this order, in case werase == erase_char */
if (c == werase_char) {
if (cp > cmdbuf) {
while (isspace(cp[-1]) && !cmd_erase());
while (!isspace(cp[-1]) && !cmd_erase());
while (isspace(cp[-1]) && !cmd_erase());
}
return(cp == cmdbuf);
}
if (c == kill_char) {
while (!cmd_erase());
return(1);
}
/*
* No room in the command buffer, or no room on the screen;
* {{ Could get fancy here; maybe shift the displayed line
* and make room for more chars, like ksh. }}
*/
if (cp >= &cmdbuf[sizeof(cmdbuf)-1] || cmd_col >= sc_width-3)
bell();
else {
*cp++ = c;
if (CONTROL_CHAR(c)) {
putchr('^');
cmd_col++;
c &= ~0200;
c = CARAT_CHAR(c);
}
putchr(c);
cmd_col++;
}
return(0);
}
prompt()
{
extern int linenums, short_file;
extern char *current_name, *firstsearch, *next_name;
off_t len, pos, ch_length(), position(), forw_line();
char pbuf[40];
/*
* if nothing is displayed yet, display starting from line 1;
* if search string provided, go there instead.
*/
if (position(TOP) == NULL_POSITION) {
if (forw_line((off_t)0) == NULL_POSITION)
return(0);
if (!firstsearch || !search(1, firstsearch, 1, 1))
jump_back(1);
}
else if (screen_trashed)
repaint();
/* if no -e flag and we've hit EOF on the last file, quit. */
if (!quit_at_eof && hit_eof && curr_ac + 1 >= ac)
quit();
/* select the proper prompt and display it. */
lower_left();
clear_eol();
if (longprompt) {
so_enter();
putstr(current_name);
putstr(":");
if (!ispipe) {
(void)snprintf(pbuf, sizeof(pbuf),
" file %d/%d", curr_ac + 1, ac);
putstr(pbuf);
}
if (linenums) {
(void)snprintf(pbuf, sizeof(pbuf),
" line %d", currline(BOTTOM));
putstr(pbuf);
}
if ((pos = position(BOTTOM)) != NULL_POSITION) {
(void)snprintf(pbuf, sizeof(pbuf), " byte %qd", pos);
putstr(pbuf);
if (!ispipe && (len = ch_length())) {
(void)snprintf(pbuf, sizeof(pbuf),
"/%qd pct %qd%%", len, ((100 * pos) / len));
putstr(pbuf);
}
}
so_exit();
longprompt = 0;
}
else {
so_enter();
putstr(current_name);
if (hit_eof)
if (next_name) {
putstr(": END (next file: ");
putstr(next_name);
putstr(")");
}
else
putstr(": END");
else if (!ispipe &&
(pos = position(BOTTOM)) != NULL_POSITION &&
(len = ch_length())) {
(void)snprintf(pbuf, sizeof(pbuf),
" (%qd%%)", ((100 * pos) / len));
putstr(pbuf);
}
so_exit();
}
return(1);
}
/* get command character. */
static
getcc()
{
extern int cmdstack;
int ch;
off_t position();
/* left over from error() routine. */
if (cmdstack) {
ch = cmdstack;
cmdstack = NULL;
return(ch);
}
if (cp > cmdbuf && position(TOP) == NULL_POSITION) {
/*
* Command is incomplete, so try to complete it.
* There are only two cases:
* 1. We have "/string" but no newline. Add the \n.
* 2. We have a number but no command. Treat as #g.
* (This is all pretty hokey.)
*/
if (mca != A_DIGIT)
/* Not a number; must be search string */
return('\n');
else
/* A number; append a 'g' */
return('g');
}
return(getchr());
}
/* execute a multicharacter command. */
static
exec_mca()
{
extern int file;
extern char *tagfile;
register char *p;
char *glob();
*cp = '\0';
CMD_EXEC;
switch (mca) {
case A_F_SEARCH:
(void)search(1, cmdbuf, number, wsearch);
break;
case A_B_SEARCH:
(void)search(0, cmdbuf, number, wsearch);
break;
case A_EXAMINE:
for (p = cmdbuf; isspace(*p); ++p);
(void)edit(glob(p));
break;
case A_TAGFILE:
for (p = cmdbuf; isspace(*p); ++p);
findtag(p);
if (tagfile == NULL)
break;
if (edit(tagfile))
(void)tagsearch();
break;
}
}
/* add a character to a multi-character command. */
static
mca_char(c)
int c;
{
switch (mca) {
case 0: /* not in a multicharacter command. */
case A_PREFIX: /* in the prefix of a command. */
return(NO_MCA);
case A_DIGIT:
/*
* Entering digits of a number.
* Terminated by a non-digit.
*/
if (!isascii(c) || !isdigit(c) &&
c != erase_char && c != kill_char && c != werase_char) {
/*
* Not part of the number.
* Treat as a normal command character.
*/
*cp = '\0';
number = atoi(cmdbuf);
CMD_RESET;
mca = 0;
return(NO_MCA);
}
break;
}
/*
* Any other multicharacter command
* is terminated by a newline.
*/
if (c == '\n' || c == '\r') {
exec_mca();
return(MCA_DONE);
}
/* append the char to the command buffer. */
if (cmd_char(c))
return(MCA_DONE);
return(MCA_MORE);
}
/*
* Main command processor.
* Accept and execute commands until a quit command, then return.
*/
commands()
{
register int c;
register int action;
last_mca = 0;
scroll = (sc_height + 1) / 2;
for (;;) {
mca = 0;
number = 0;
/*
* See if any signals need processing.
*/
if (sigs) {
psignals();
if (quitting)
quit();
}
/*
* Display prompt and accept a character.
*/
CMD_RESET;
if (!prompt()) {
next_file(1);
continue;
}
noprefix();
c = getcc();
again: if (sigs)
continue;
/*
* If we are in a multicharacter command, call mca_char.
* Otherwise we call cmd_decode to determine the
* action to be performed.
*/
if (mca)
switch (mca_char(c)) {
case MCA_MORE:
/*
* Need another character.
*/
c = getcc();
goto again;
case MCA_DONE:
/*
* Command has been handled by mca_char.
* Start clean with a prompt.
*/
continue;
case NO_MCA:
/*
* Not a multi-char command
* (at least, not anymore).
*/
break;
}
/* decode the command character and decide what to do. */
switch (action = cmd_decode(c)) {
case A_DIGIT: /* first digit of a number */
start_mca(A_DIGIT, ":");
goto again;
case A_F_SCREEN: /* forward one screen */
CMD_EXEC;
if (number <= 0 && (number = sc_window) <= 0)
number = sc_height - 1;
forward(number, 1);
break;
case A_B_SCREEN: /* backward one screen */
CMD_EXEC;
if (number <= 0 && (number = sc_window) <= 0)
number = sc_height - 1;
backward(number, 1);
break;
case A_F_LINE: /* forward N (default 1) line */
CMD_EXEC;
forward(number <= 0 ? 1 : number, 0);
break;
case A_B_LINE: /* backward N (default 1) line */
CMD_EXEC;
backward(number <= 0 ? 1 : number, 0);
break;
case A_F_SCROLL: /* forward N lines */
CMD_EXEC;
if (number > 0)
scroll = number;
forward(scroll, 0);
break;
case A_B_SCROLL: /* backward N lines */
CMD_EXEC;
if (number > 0)
scroll = number;
backward(scroll, 0);
break;
case A_FREPAINT: /* flush buffers and repaint */
if (!ispipe) {
ch_init(0, 0);
clr_linenum();
}
/* FALLTHROUGH */
case A_REPAINT: /* repaint the screen */
CMD_EXEC;
repaint();
break;
case A_GOLINE: /* go to line N, default 1 */
CMD_EXEC;
if (number <= 0)
number = 1;
jump_back(number);
break;
case A_PERCENT: /* go to percent of file */
CMD_EXEC;
if (number < 0)
number = 0;
else if (number > 100)
number = 100;
jump_percent(number);
break;
case A_GOEND: /* go to line N, default end */
CMD_EXEC;
if (number <= 0)
jump_forw();
else
jump_back(number);
break;
case A_STAT: /* print file name, etc. */
longprompt = 1;
continue;
case A_QUIT: /* exit */
quit();
case A_F_SEARCH: /* search for a pattern */
case A_B_SEARCH:
if (number <= 0)
number = 1;
start_mca(action, (action==A_F_SEARCH) ? "/" : "?");
last_mca = mca;
wsearch = 1;
c = getcc();
if (c == '!') {
/*
* Invert the sense of the search; set wsearch
* to 0 and get a new character for the start
* of the pattern.
*/
start_mca(action,
(action == A_F_SEARCH) ? "!/" : "!?");
wsearch = 0;
c = getcc();
}
goto again;
case A_AGAIN_SEARCH: /* repeat previous search */
if (number <= 0)
number = 1;
if (wsearch)
start_mca(last_mca,
(last_mca == A_F_SEARCH) ? "/" : "?");
else
start_mca(last_mca,
(last_mca == A_F_SEARCH) ? "!/" : "!?");
CMD_EXEC;
(void)search(mca == A_F_SEARCH, (char *)NULL,
number, wsearch);
break;
case A_HELP: /* help */
if (ac > 0 && !strcmp(_PATH_HELPFILE, av[curr_ac])) {
error("Already viewing help.");
break;
}
lower_left();
clear_eol();
putstr("help");
CMD_EXEC;
help();
break;
case A_TAGFILE: /* tag a new file */
CMD_RESET;
start_mca(A_TAGFILE, "Tag: ");
c = getcc();
goto again;
case A_FILE_LIST: /* show list of file names */
CMD_EXEC;
showlist();
repaint();
break;
case A_EXAMINE: /* edit a new file */
CMD_RESET;
start_mca(A_EXAMINE, "Examine: ");
c = getcc();
goto again;
case A_VISUAL: /* invoke the editor */
if (ispipe) {
error("Cannot edit standard input");
break;
}
CMD_EXEC;
editfile();
ch_init(0, 0);
clr_linenum();
break;
case A_NEXT_FILE: /* examine next file */
if (number <= 0)
number = 1;
next_file(number);
break;
case A_PREV_FILE: /* examine previous file */
if (number <= 0)
number = 1;
prev_file(number);
break;
case A_SETMARK: /* set a mark */
lower_left();
clear_eol();
start_mca(A_SETMARK, "mark: ");
c = getcc();
if (c == erase_char || c == kill_char)
break;
setmark(c);
break;
case A_GOMARK: /* go to mark */
lower_left();
clear_eol();
start_mca(A_GOMARK, "goto mark: ");
c = getcc();
if (c == erase_char || c == kill_char)
break;
gomark(c);
break;
case A_PREFIX:
/*
* The command is incomplete (more chars are needed).
* Display the current char so the user knows what's
* going on and get another character.
*/
if (mca != A_PREFIX)
start_mca(A_PREFIX, "");
if (CONTROL_CHAR(c)) {
putchr('^');
c &= ~0200;
c = CARAT_CHAR(c);
}
putchr(c);
c = getcc();
goto again;
default:
bell();
break;
}
}
}
editfile()
{
extern char *current_file;
static int dolinenumber;
static char *editor;
char *base;
int c;
char buf[MAXPATHLEN * 2 + 20], *getenv();
if (editor == NULL) {
editor = getenv("EDITOR");
/* default editor is vi */
if (editor == NULL || *editor == '\0')
editor = _PATH_VI;
/* check last component in case of full path */
base = strrchr(editor, '/');
if (!base)
base = editor;
else
base++;
/* emacs also accepts vi-style +nnnn */
if (strcmp(base, "vi") == 0 || strcmp(base, "emacs") == 0)
dolinenumber = 1;
else
dolinenumber = 0;
}
if (dolinenumber && (c = currline(MIDDLE)))
(void)snprintf(buf, sizeof(buf),
"%s +%d %s", editor, c, current_file);
else
(void)snprintf(buf, sizeof(buf), "%s %s", editor, current_file);
lsystem(buf);
}
showlist()
{
extern int sc_width;
register int indx, width;
int len;
char *p;
if (ac <= 0) {
error("No files provided as arguments.");
return;
}
for (width = indx = 0; indx < ac;) {
p = strcmp(av[indx], "-") ? av[indx] : "stdin";
len = strlen(p) + 1;
if (curr_ac == indx)
len += 2;
if (width + len + 1 >= sc_width) {
if (!width) {
if (curr_ac == indx)
putchr('[');
putstr(p);
if (curr_ac == indx)
putchr(']');
++indx;
}
width = 0;
putchr('\n');
continue;
}
if (width)
putchr(' ');
if (curr_ac == indx)
putchr('[');
putstr(p);
if (curr_ac == indx)
putchr(']');
width += len;
++indx;
}
putchr('\n');
error((char *)NULL);
}
|