1 /*
2 * Copyright (C) 1984-2012 Mark Nudelman
3 * Modified for use with illumos by Garrett D'Amore.
4 * Copyright 2014 Garrett D'Amore <garrett@damore.org>
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Less License, as specified in the README file.
8 *
9 * For more information, see the README file.
10 */
11
12 /*
13 * Routines to decode user commands.
14 *
15 * This is all table driven.
16 * A command table is a sequence of command descriptors.
17 * Each command descriptor is a sequence of bytes with the following format:
18 * <c1><c2>...<cN><0><action>
19 * The characters c1,c2,...,cN are the command string; that is,
20 * the characters which the user must type.
21 * It is terminated by a null <0> byte.
22 * The byte after the null byte is the action code associated
23 * with the command string.
24 * If an action byte is OR-ed with A_EXTRA, this indicates
25 * that the option byte is followed by an extra string.
26 *
27 * There may be many command tables.
28 * The first (default) table is built-in.
29 * Other tables are read in from "lesskey" files.
30 * All the tables are linked together and are searched in order.
31 */
32
33 #include "cmd.h"
34 #include "less.h"
35 #include "lesskey.h"
36
37 extern int erase_char, erase2_char, kill_char;
38 extern int secure, less_is_more;
39
40 #define SK(k) \
41 SK_SPECIAL_KEY, (k), 6, 1, 1, 1
42 /*
43 * Command table is ordered roughly according to expected
44 * frequency of use, so the common commands are near the beginning.
45 */
46
47 static unsigned char cmdtable[] =
48 {
49 '\r', 0, A_F_LINE,
50 '\n', 0, A_F_LINE,
51 'e', 0, A_F_LINE,
52 'j', 0, A_F_LINE,
53 SK(SK_DOWN_ARROW), 0, A_F_LINE,
54 CONTROL('E'), 0, A_F_LINE,
55 CONTROL('N'), 0, A_F_LINE,
56 'k', 0, A_B_LINE,
57 'y', 0, A_B_LINE,
58 CONTROL('Y'), 0, A_B_LINE,
59 SK(SK_CONTROL_K), 0, A_B_LINE,
60 CONTROL('P'), 0, A_B_LINE,
61 SK(SK_UP_ARROW), 0, A_B_LINE,
62 'J', 0, A_FF_LINE,
63 'K', 0, A_BF_LINE,
64 'Y', 0, A_BF_LINE,
65 'd', 0, A_F_SCROLL,
66 CONTROL('D'), 0, A_F_SCROLL,
67 'u', 0, A_B_SCROLL,
68 CONTROL('U'), 0, A_B_SCROLL,
69 ' ', 0, A_F_SCREEN,
70 'f', 0, A_F_SCREEN,
71 CONTROL('F'), 0, A_F_SCREEN,
72 CONTROL('V'), 0, A_F_SCREEN,
73 SK(SK_PAGE_DOWN), 0, A_F_SCREEN,
74 'b', 0, A_B_SCREEN,
75 CONTROL('B'), 0, A_B_SCREEN,
76 ESC, 'v', 0, A_B_SCREEN,
77 SK(SK_PAGE_UP), 0, A_B_SCREEN,
78 'z', 0, A_F_WINDOW,
79 'w', 0, A_B_WINDOW,
80 ESC, ' ', 0, A_FF_SCREEN,
81 'F', 0, A_F_FOREVER,
82 ESC, 'F', 0, A_F_UNTIL_HILITE,
83 'R', 0, A_FREPAINT,
84 'r', 0, A_REPAINT,
85 CONTROL('R'), 0, A_REPAINT,
86 CONTROL('L'), 0, A_REPAINT,
87 ESC, 'u', 0, A_UNDO_SEARCH,
88 'g', 0, A_GOLINE,
89 SK(SK_HOME), 0, A_GOLINE,
90 '<', 0, A_GOLINE,
91 ESC, '<', 0, A_GOLINE,
92 'p', 0, A_PERCENT,
93 '%', 0, A_PERCENT,
94 ESC, '[', 0, A_LSHIFT,
95 ESC, ']', 0, A_RSHIFT,
96 ESC, '(', 0, A_LSHIFT,
97 ESC, ')', 0, A_RSHIFT,
98 SK(SK_RIGHT_ARROW), 0, A_RSHIFT,
99 SK(SK_LEFT_ARROW), 0, A_LSHIFT,
100 '{', 0, A_F_BRACKET|A_EXTRA, '{', '}', 0,
101 '}', 0, A_B_BRACKET|A_EXTRA, '{', '}', 0,
102 '(', 0, A_F_BRACKET|A_EXTRA, '(', ')', 0,
103 ')', 0, A_B_BRACKET|A_EXTRA, '(', ')', 0,
104 '[', 0, A_F_BRACKET|A_EXTRA, '[', ']', 0,
105 ']', 0, A_B_BRACKET|A_EXTRA, '[', ']', 0,
106 ESC, CONTROL('F'), 0, A_F_BRACKET,
107 ESC, CONTROL('B'), 0, A_B_BRACKET,
108 'G', 0, A_GOEND,
109 ESC, '>', 0, A_GOEND,
110 '>', 0, A_GOEND,
111 SK(SK_END), 0, A_GOEND,
112 'P', 0, A_GOPOS,
113
114 '0', 0, A_DIGIT,
115 '1', 0, A_DIGIT,
116 '2', 0, A_DIGIT,
117 '3', 0, A_DIGIT,
118 '4', 0, A_DIGIT,
119 '5', 0, A_DIGIT,
120 '6', 0, A_DIGIT,
121 '7', 0, A_DIGIT,
122 '8', 0, A_DIGIT,
123 '9', 0, A_DIGIT,
124 '.', 0, A_DIGIT,
125
126 '=', 0, A_STAT,
127 CONTROL('G'), 0, A_STAT,
128 ':', 'f', 0, A_STAT,
129 '/', 0, A_F_SEARCH,
130 '?', 0, A_B_SEARCH,
131 ESC, '/', 0, A_F_SEARCH|A_EXTRA, '*', 0,
132 ESC, '?', 0, A_B_SEARCH|A_EXTRA, '*', 0,
133 'n', 0, A_AGAIN_SEARCH,
134 ESC, 'n', 0, A_T_AGAIN_SEARCH,
135 'N', 0, A_REVERSE_SEARCH,
136 ESC, 'N', 0, A_T_REVERSE_SEARCH,
137 '&', 0, A_FILTER,
138 'm', 0, A_SETMARK,
139 '\'', 0, A_GOMARK,
140 CONTROL('X'), CONTROL('X'), 0, A_GOMARK,
141 'E', 0, A_EXAMINE,
142 ':', 'e', 0, A_EXAMINE,
143 CONTROL('X'), CONTROL('V'), 0, A_EXAMINE,
144 ':', 'n', 0, A_NEXT_FILE,
145 ':', 'p', 0, A_PREV_FILE,
146 't', 0, A_NEXT_TAG,
147 'T', 0, A_PREV_TAG,
148 ':', 'x', 0, A_INDEX_FILE,
149 ':', 'd', 0, A_REMOVE_FILE,
150 ':', 't', 0, A_OPT_TOGGLE|A_EXTRA, 't', 0,
151 '|', 0, A_PIPE,
152 'v', 0, A_VISUAL,
153 '+', 0, A_FIRSTCMD,
154
155 'H', 0, A_HELP,
156 'h', 0, A_HELP,
157 SK(SK_F1), 0, A_HELP,
158 'V', 0, A_VERSION,
159 'q', 0, A_QUIT,
160 'Q', 0, A_QUIT,
161 ':', 'q', 0, A_QUIT,
162 ':', 'Q', 0, A_QUIT,
163 'Z', 'Z', 0, A_QUIT
164 };
165
166 static unsigned char lesstable[] = {
167 '-', 0, A_OPT_TOGGLE,
168 's', 0, A_OPT_TOGGLE|A_EXTRA, 'o', 0,
169 '_', 0, A_DISP_OPTION
170 };
171
172 static unsigned char moretable[] = {
173 's', 0, A_F_SKIP
174 };
175
176 static unsigned char edittable[] =
177 {
178 '\t', 0, EC_F_COMPLETE, /* TAB */
179 '\17', 0, EC_B_COMPLETE, /* BACKTAB */
180 SK(SK_BACKTAB), 0, EC_B_COMPLETE, /* BACKTAB */
181 ESC, '\t', 0, EC_B_COMPLETE, /* ESC TAB */
182 CONTROL('L'), 0, EC_EXPAND, /* CTRL-L */
183 CONTROL('V'), 0, EC_LITERAL, /* BACKSLASH */
184 CONTROL('A'), 0, EC_LITERAL, /* BACKSLASH */
185 ESC, 'l', 0, EC_RIGHT, /* ESC l */
186 SK(SK_RIGHT_ARROW), 0, EC_RIGHT, /* RIGHTARROW */
187 ESC, 'h', 0, EC_LEFT, /* ESC h */
188 SK(SK_LEFT_ARROW), 0, EC_LEFT, /* LEFTARROW */
189 ESC, 'b', 0, EC_W_LEFT, /* ESC b */
190 ESC, SK(SK_LEFT_ARROW), 0, EC_W_LEFT, /* ESC LEFTARROW */
191 SK(SK_CTL_LEFT_ARROW), 0, EC_W_LEFT, /* CTRL-LEFTARROW */
192 ESC, 'w', 0, EC_W_RIGHT, /* ESC w */
193 ESC, SK(SK_RIGHT_ARROW), 0, EC_W_RIGHT, /* ESC RIGHTARROW */
194 SK(SK_CTL_RIGHT_ARROW), 0, EC_W_RIGHT, /* CTRL-RIGHTARROW */
195 ESC, 'i', 0, EC_INSERT, /* ESC i */
196 SK(SK_INSERT), 0, EC_INSERT, /* INSERT */
197 ESC, 'x', 0, EC_DELETE, /* ESC x */
198 SK(SK_DELETE), 0, EC_DELETE, /* DELETE */
199 ESC, 'X', 0, EC_W_DELETE, /* ESC X */
200 ESC, SK(SK_DELETE), 0, EC_W_DELETE, /* ESC DELETE */
201 SK(SK_CTL_DELETE), 0, EC_W_DELETE, /* CTRL-DELETE */
202 SK(SK_CTL_BACKSPACE), 0, EC_W_BACKSPACE, /* CTRL-BACKSPACE */
203 ESC, '\b', 0, EC_W_BACKSPACE, /* ESC BACKSPACE */
204 ESC, '0', 0, EC_HOME, /* ESC 0 */
205 SK(SK_HOME), 0, EC_HOME, /* HOME */
206 ESC, '$', 0, EC_END, /* ESC $ */
207 SK(SK_END), 0, EC_END, /* END */
208 ESC, 'k', 0, EC_UP, /* ESC k */
209 SK(SK_UP_ARROW), 0, EC_UP, /* UPARROW */
210 ESC, 'j', 0, EC_DOWN, /* ESC j */
211 SK(SK_DOWN_ARROW), 0, EC_DOWN, /* DOWNARROW */
212 CONTROL('G'), 0, EC_ABORT, /* CTRL-G */
213 };
214
215 /*
216 * Structure to support a list of command tables.
217 */
218 struct tablelist {
219 struct tablelist *t_next;
220 char *t_start;
221 char *t_end;
222 };
223
224 /*
225 * List of command tables and list of line-edit tables.
226 */
227 static struct tablelist *list_fcmd_tables = NULL;
228 static struct tablelist *list_ecmd_tables = NULL;
229 static struct tablelist *list_var_tables = NULL;
230 static struct tablelist *list_sysvar_tables = NULL;
231
232
233 /*
234 * Expand special key abbreviations in a command table.
235 */
236 static void
expand_special_keys(char * table,int len)237 expand_special_keys(char *table, int len)
238 {
239 char *fm;
240 char *to;
241 int a;
242 char *repl;
243 int klen;
244
245 for (fm = table; fm < table + len; ) {
246 /*
247 * Rewrite each command in the table with any
248 * special key abbreviations expanded.
249 */
250 for (to = fm; *fm != '\0'; ) {
251 if (*fm != SK_SPECIAL_KEY) {
252 *to++ = *fm++;
253 continue;
254 }
255 /*
256 * After SK_SPECIAL_KEY, next byte is the type
257 * of special key (one of the SK_* contants),
258 * and the byte after that is the number of bytes,
259 * N, reserved by the abbreviation (including the
260 * SK_SPECIAL_KEY and key type bytes).
261 * Replace all N bytes with the actual bytes
262 * output by the special key on this terminal.
263 */
264 repl = special_key_str(fm[1]);
265 klen = fm[2] & 0377;
266 fm += klen;
267 if (repl == NULL || strlen(repl) > klen)
268 repl = "\377";
269 while (*repl != '\0')
270 *to++ = *repl++;
271 }
272 *to++ = '\0';
273 /*
274 * Fill any unused bytes between end of command and
275 * the action byte with A_SKIP.
276 */
277 while (to <= fm)
278 *to++ = A_SKIP;
279 fm++;
280 a = *fm++ & 0377;
281 if (a & A_EXTRA) {
282 while (*fm++ != '\0')
283 continue;
284 }
285 }
286 }
287
288 /*
289 * Initialize the command lists.
290 */
291 void
init_cmds(void)292 init_cmds(void)
293 {
294 /*
295 * Add the default command tables.
296 */
297 add_fcmd_table((char *)cmdtable, sizeof (cmdtable));
298 add_ecmd_table((char *)edittable, sizeof (edittable));
299 if (less_is_more) {
300 add_fcmd_table((char *)moretable, sizeof (moretable));
301 return;
302 } else {
303 add_fcmd_table((char *)lesstable, sizeof (lesstable));
304 }
305
306 /*
307 * Try to add the tables in the system lesskey file.
308 */
309 add_hometable("LESSKEY_SYSTEM", LESSKEYFILE_SYS, 1);
310 /*
311 * Try to add the tables in the standard lesskey file "$HOME/.less".
312 */
313 add_hometable("LESSKEY", LESSKEYFILE, 0);
314 }
315
316 /*
317 * Add a command table.
318 */
319 static int
add_cmd_table(struct tablelist ** tlist,char * buf,int len)320 add_cmd_table(struct tablelist **tlist, char *buf, int len)
321 {
322 struct tablelist *t;
323
324 if (len == 0)
325 return (0);
326 /*
327 * Allocate a tablelist structure, initialize it,
328 * and link it into the list of tables.
329 */
330 if ((t = calloc(1, sizeof (struct tablelist))) == NULL) {
331 return (-1);
332 }
333 expand_special_keys(buf, len);
334 t->t_start = buf;
335 t->t_end = buf + len;
336 t->t_next = *tlist;
337 *tlist = t;
338 return (0);
339 }
340
341 /*
342 * Add a command table.
343 */
344 void
add_fcmd_table(char * buf,int len)345 add_fcmd_table(char *buf, int len)
346 {
347 if (add_cmd_table(&list_fcmd_tables, buf, len) < 0)
348 error("Warning: some commands disabled", NULL);
349 }
350
351 /*
352 * Add an editing command table.
353 */
354 void
add_ecmd_table(char * buf,int len)355 add_ecmd_table(char *buf, int len)
356 {
357 if (add_cmd_table(&list_ecmd_tables, buf, len) < 0)
358 error("Warning: some edit commands disabled", NULL);
359 }
360
361 /*
362 * Add an environment variable table.
363 */
364 static void
add_var_table(struct tablelist ** tlist,char * buf,int len)365 add_var_table(struct tablelist **tlist, char *buf, int len)
366 {
367 if (add_cmd_table(tlist, buf, len) < 0)
368 error("Warning: environment variables from "
369 "lesskey file unavailable", NULL);
370 }
371
372 /*
373 * Search a single command table for the command string in cmd.
374 */
375 static int
cmd_search(const char * cmd,char * table,char * endtable,char ** sp)376 cmd_search(const char *cmd, char *table, char *endtable, char **sp)
377 {
378 char *p;
379 const char *q;
380 int a;
381
382 *sp = NULL;
383 for (p = table, q = cmd; p < endtable; p++, q++) {
384 if (*p == *q) {
385 /*
386 * Current characters match.
387 * If we're at the end of the string, we've found it.
388 * Return the action code, which is the character
389 * after the null at the end of the string
390 * in the command table.
391 */
392 if (*p == '\0') {
393 a = *++p & 0377;
394 while (a == A_SKIP)
395 a = *++p & 0377;
396 if (a == A_END_LIST) {
397 /*
398 * We get here only if the original
399 * cmd string passed in was empty ("").
400 * I don't think that can happen,
401 * but just in case ...
402 */
403 return (A_UINVALID);
404 }
405 /*
406 * Check for an "extra" string.
407 */
408 if (a & A_EXTRA) {
409 *sp = ++p;
410 a &= ~A_EXTRA;
411 }
412 return (a);
413 }
414 } else if (*q == '\0') {
415 /*
416 * Hit the end of the user's command,
417 * but not the end of the string in the command table.
418 * The user's command is incomplete.
419 */
420 return (A_PREFIX);
421 } else {
422 /*
423 * Not a match.
424 * Skip ahead to the next command in the
425 * command table, and reset the pointer
426 * to the beginning of the user's command.
427 */
428 if (*p == '\0' && p[1] == A_END_LIST) {
429 /*
430 * A_END_LIST is a special marker that tells
431 * us to abort the cmd search.
432 */
433 return (A_UINVALID);
434 }
435 while (*p++ != '\0')
436 continue;
437 while (*p == A_SKIP)
438 p++;
439 if (*p & A_EXTRA)
440 while (*++p != '\0')
441 continue;
442 q = cmd-1;
443 }
444 }
445 /*
446 * No match found in the entire command table.
447 */
448 return (A_INVALID);
449 }
450
451 /*
452 * Decode a command character and return the associated action.
453 * The "extra" string, if any, is returned in sp.
454 */
455 static int
cmd_decode(struct tablelist * tlist,const char * cmd,char ** sp)456 cmd_decode(struct tablelist *tlist, const char *cmd, char **sp)
457 {
458 struct tablelist *t;
459 int action = A_INVALID;
460
461 /*
462 * Search thru all the command tables.
463 * Stop when we find an action which is not A_INVALID.
464 */
465 for (t = tlist; t != NULL; t = t->t_next) {
466 action = cmd_search(cmd, t->t_start, t->t_end, sp);
467 if (action != A_INVALID)
468 break;
469 }
470 if (action == A_UINVALID)
471 action = A_INVALID;
472 return (action);
473 }
474
475 /*
476 * Decode a command from the cmdtables list.
477 */
478 int
fcmd_decode(const char * cmd,char ** sp)479 fcmd_decode(const char *cmd, char **sp)
480 {
481 return (cmd_decode(list_fcmd_tables, cmd, sp));
482 }
483
484 /*
485 * Decode a command from the edittables list.
486 */
487 int
ecmd_decode(const char * cmd,char ** sp)488 ecmd_decode(const char *cmd, char **sp)
489 {
490 return (cmd_decode(list_ecmd_tables, cmd, sp));
491 }
492
493 /*
494 * Get the value of an environment variable.
495 * Looks first in the lesskey file, then in the real environment.
496 */
497 char *
lgetenv(char * var)498 lgetenv(char *var)
499 {
500 int a;
501 char *s;
502
503 /*
504 * Ignore lookups of any LESS* setting when we are more, and ignore
505 * the less key files
506 */
507 if (less_is_more) {
508 if (strncmp(var, "LESS", 4) == 0) {
509 return (NULL);
510 }
511 return (getenv(var));
512 }
513 a = cmd_decode(list_var_tables, var, &s);
514 if (a == EV_OK)
515 return (s);
516 s = getenv(var);
517 if (s != NULL && *s != '\0')
518 return (s);
519 a = cmd_decode(list_sysvar_tables, var, &s);
520 if (a == EV_OK)
521 return (s);
522 return (NULL);
523 }
524
525 /*
526 * Get an "integer" from a lesskey file.
527 * Integers are stored in a funny format:
528 * two bytes, low order first, in radix KRADIX.
529 */
530 static int
gint(char ** sp)531 gint(char **sp)
532 {
533 int n;
534
535 n = *(*sp)++;
536 n += *(*sp)++ * KRADIX;
537 return (n);
538 }
539
540 /*
541 * Process an old (pre-v241) lesskey file.
542 */
543 static int
old_lesskey(char * buf,int len)544 old_lesskey(char *buf, int len)
545 {
546 /*
547 * Old-style lesskey file.
548 * The file must end with either
549 * ..,cmd,0,action
550 * or ...,cmd,0,action|A_EXTRA,string,0
551 * So the last byte or the second to last byte must be zero.
552 */
553 if (buf[len-1] != '\0' && buf[len-2] != '\0')
554 return (-1);
555 add_fcmd_table(buf, len);
556 return (0);
557 }
558
559 /*
560 * Process a new (post-v241) lesskey file.
561 */
562 static int
new_lesskey(char * buf,int len,int sysvar)563 new_lesskey(char *buf, int len, int sysvar)
564 {
565 char *p;
566 char *end;
567 int c;
568 int n;
569
570 /*
571 * New-style lesskey file.
572 * Extract the pieces.
573 */
574 if (buf[len-3] != C0_END_LESSKEY_MAGIC ||
575 buf[len-2] != C1_END_LESSKEY_MAGIC ||
576 buf[len-1] != C2_END_LESSKEY_MAGIC)
577 return (-1);
578 p = buf + 4;
579 end = buf + len;
580 for (;;) {
581 c = *p++;
582 switch (c) {
583 case CMD_SECTION:
584 n = gint(&p);
585 if (n < 0 || p + n >= end)
586 return (-1);
587 add_fcmd_table(p, n);
588 p += n;
589 break;
590 case EDIT_SECTION:
591 n = gint(&p);
592 if (n < 0 || p + n >= end)
593 return (-1);
594 add_ecmd_table(p, n);
595 p += n;
596 break;
597 case VAR_SECTION:
598 n = gint(&p);
599 if (n < 0 || p + n >= end)
600 return (-1);
601 add_var_table((sysvar) ?
602 &list_sysvar_tables : &list_var_tables, p, n);
603 p += n;
604 break;
605 case END_SECTION:
606 return (0);
607 default:
608 /*
609 * Unrecognized section type.
610 */
611 return (-1);
612 }
613 }
614 }
615
616 /*
617 * Set up a user command table, based on a "lesskey" file.
618 */
619 int
lesskey(char * filename,int sysvar)620 lesskey(char *filename, int sysvar)
621 {
622 char *buf;
623 off_t len;
624 long n;
625 int f;
626
627 if (secure)
628 return (1);
629 /*
630 * Try to open the lesskey file.
631 */
632 filename = shell_unquote(filename);
633 f = open(filename, O_RDONLY);
634 free(filename);
635 if (f == -1)
636 return (1);
637
638 /*
639 * Read the file into a buffer.
640 * We first figure out the size of the file and allocate space for it.
641 * {{ Minimal error checking is done here.
642 * A garbage .less file will produce strange results.
643 * To avoid a large amount of error checking code here, we
644 * rely on the lesskey program to generate a good .less file. }}
645 */
646 len = filesize(f);
647 if (len == -1 || len < 3) {
648 /*
649 * Bad file (valid file must have at least 3 chars).
650 */
651 (void) close(f);
652 return (-1);
653 }
654 if ((buf = calloc((int)len, sizeof (char))) == NULL) {
655 (void) close(f);
656 return (-1);
657 }
658 if (lseek(f, (off_t)0, SEEK_SET) == (off_t)-1) {
659 free(buf);
660 (void) close(f);
661 return (-1);
662 }
663 n = read(f, buf, (unsigned int) len);
664 close(f);
665 if (n != len) {
666 free(buf);
667 return (-1);
668 }
669
670 /*
671 * Figure out if this is an old-style (before version 241)
672 * or new-style lesskey file format.
673 */
674 if (len < 4 ||
675 buf[0] != C0_LESSKEY_MAGIC || buf[1] != C1_LESSKEY_MAGIC ||
676 buf[2] != C2_LESSKEY_MAGIC || buf[3] != C3_LESSKEY_MAGIC)
677 return (old_lesskey(buf, (int)len));
678 return (new_lesskey(buf, (int)len, sysvar));
679 }
680
681 /*
682 * Add the standard lesskey file "$HOME/.less"
683 */
684 void
add_hometable(char * envname,char * def_filename,int sysvar)685 add_hometable(char *envname, char *def_filename, int sysvar)
686 {
687 char *filename;
688 PARG parg;
689
690 if (envname != NULL && (filename = lgetenv(envname)) != NULL)
691 filename = estrdup(filename);
692 else if (sysvar)
693 filename = estrdup(def_filename);
694 else
695 filename = homefile(def_filename);
696 if (filename == NULL)
697 return;
698 if (lesskey(filename, sysvar) < 0) {
699 parg.p_string = filename;
700 error("Cannot use lesskey file \"%s\"", &parg);
701 }
702 free(filename);
703 }
704
705 /*
706 * See if a char is a special line-editing command.
707 */
708 int
editchar(int c,int flags)709 editchar(int c, int flags)
710 {
711 int action;
712 int nch;
713 char *s;
714 char usercmd[MAX_CMDLEN+1];
715
716 /*
717 * An editing character could actually be a sequence of characters;
718 * for example, an escape sequence sent by pressing the uparrow key.
719 * To match the editing string, we use the command decoder
720 * but give it the edit-commands command table
721 * This table is constructed to match the user's keyboard.
722 */
723 if (c == erase_char || c == erase2_char)
724 return (EC_BACKSPACE);
725 if (c == kill_char)
726 return (EC_LINEKILL);
727
728 /*
729 * Collect characters in a buffer.
730 * Start with the one we have, and get more if we need them.
731 */
732 nch = 0;
733 do {
734 if (nch > 0)
735 c = getcc();
736 usercmd[nch] = (char)c;
737 usercmd[nch+1] = '\0';
738 nch++;
739 action = ecmd_decode(usercmd, &s);
740 } while (action == A_PREFIX);
741
742 if (flags & EC_NORIGHTLEFT) {
743 switch (action) {
744 case EC_RIGHT:
745 case EC_LEFT:
746 action = A_INVALID;
747 break;
748 }
749 }
750 if (flags & EC_NOHISTORY) {
751 /*
752 * The caller says there is no history list.
753 * Reject any history-manipulation action.
754 */
755 switch (action) {
756 case EC_UP:
757 case EC_DOWN:
758 action = A_INVALID;
759 break;
760 }
761 }
762 if (flags & EC_NOCOMPLETE) {
763 /*
764 * The caller says we don't want any filename completion cmds.
765 * Reject them.
766 */
767 switch (action) {
768 case EC_F_COMPLETE:
769 case EC_B_COMPLETE:
770 case EC_EXPAND:
771 action = A_INVALID;
772 break;
773 }
774 }
775 if ((flags & EC_PEEK) || action == A_INVALID) {
776 /*
777 * We're just peeking, or we didn't understand the command.
778 * Unget all the characters we read in the loop above.
779 * This does NOT include the original character that was
780 * passed in as a parameter.
781 */
782 while (nch > 1) {
783 ungetcc(usercmd[--nch]);
784 }
785 } else {
786 if (s != NULL)
787 ungetsc(s);
788 }
789 return (action);
790 }
791