1 /*
2 * Copyright (C) 1984-2024 Mark Nudelman
3 *
4 * You may distribute under the terms of either the GNU General Public
5 * License or the Less License, as specified in the README file.
6 *
7 * For more information, see the README file.
8 */
9
10
11 /*
12 * Routines to decode user commands.
13 *
14 * This is all table driven.
15 * A command table is a sequence of command descriptors.
16 * Each command descriptor is a sequence of bytes with the following format:
17 * <c1><c2>...<cN><0><action>
18 * The characters c1,c2,...,cN are the command string; that is,
19 * the characters which the user must type.
20 * It is terminated by a null <0> byte.
21 * The byte after the null byte is the action code associated
22 * with the command string.
23 * If an action byte is OR-ed with A_EXTRA, this indicates
24 * that the option byte is followed by an extra string.
25 *
26 * There may be many command tables.
27 * The first (default) table is built-in.
28 * Other tables are read in from "lesskey" files.
29 * All the tables are linked together and are searched in order.
30 */
31
32 #include "less.h"
33 #include "cmd.h"
34 #include "lesskey.h"
35
36 extern int erase_char, erase2_char, kill_char;
37 extern int mousecap;
38 extern int sc_height;
39
40 /* "content" is lesskey source, never binary. */
41 static void add_content_table(int (*call_lesskey)(constant char *, lbool), constant char *envname, lbool sysvar);
42 static int add_hometable(int (*call_lesskey)(constant char *, lbool), constant char *envname, constant char *def_filename, lbool sysvar);
43
44 #define SK(k) \
45 SK_SPECIAL_KEY, (k), 6, 1, 1, 1
46 /*
47 * Command table is ordered roughly according to expected
48 * frequency of use, so the common commands are near the beginning.
49 */
50
51 static unsigned char cmdtable[] =
52 {
53 '\r',0, A_F_LINE,
54 '\n',0, A_F_LINE,
55 'e',0, A_F_LINE,
56 'j',0, A_F_LINE,
57 SK(SK_DOWN_ARROW),0, A_F_LINE,
58 CONTROL('E'),0, A_F_LINE,
59 CONTROL('N'),0, A_F_LINE,
60 'k',0, A_B_LINE,
61 'y',0, A_B_LINE,
62 CONTROL('Y'),0, A_B_LINE,
63 SK(SK_CONTROL_K),0, A_B_LINE,
64 CONTROL('P'),0, A_B_LINE,
65 SK(SK_UP_ARROW),0, A_B_LINE,
66 'J',0, A_FF_LINE,
67 'K',0, A_BF_LINE,
68 'Y',0, A_BF_LINE,
69 'd',0, A_F_SCROLL,
70 CONTROL('D'),0, A_F_SCROLL,
71 'u',0, A_B_SCROLL,
72 CONTROL('U'),0, A_B_SCROLL,
73 ESC,'[','M',0, A_X11MOUSE_IN,
74 ESC,'[','<',0, A_X116MOUSE_IN,
75 ' ',0, A_F_SCREEN,
76 'f',0, A_F_SCREEN,
77 CONTROL('F'),0, A_F_SCREEN,
78 CONTROL('V'),0, A_F_SCREEN,
79 SK(SK_PAGE_DOWN),0, A_F_SCREEN,
80 'b',0, A_B_SCREEN,
81 CONTROL('B'),0, A_B_SCREEN,
82 ESC,'v',0, A_B_SCREEN,
83 SK(SK_PAGE_UP),0, A_B_SCREEN,
84 'z',0, A_F_WINDOW,
85 'w',0, A_B_WINDOW,
86 ESC,' ',0, A_FF_SCREEN,
87 'F',0, A_F_FOREVER,
88 ESC,'F',0, A_F_UNTIL_HILITE,
89 'R',0, A_FREPAINT,
90 'r',0, A_REPAINT,
91 CONTROL('R'),0, A_REPAINT,
92 CONTROL('L'),0, A_REPAINT,
93 ESC,'u',0, A_UNDO_SEARCH,
94 ESC,'U',0, A_CLR_SEARCH,
95 'g',0, A_GOLINE,
96 SK(SK_HOME),0, A_GOLINE,
97 '<',0, A_GOLINE,
98 ESC,'<',0, A_GOLINE,
99 'p',0, A_PERCENT,
100 '%',0, A_PERCENT,
101 ESC,'(',0, A_LSHIFT,
102 ESC,')',0, A_RSHIFT,
103 ESC,'{',0, A_LLSHIFT,
104 ESC,'}',0, A_RRSHIFT,
105 SK(SK_RIGHT_ARROW),0, A_RSHIFT,
106 SK(SK_LEFT_ARROW),0, A_LSHIFT,
107 SK(SK_CTL_RIGHT_ARROW),0, A_RRSHIFT,
108 SK(SK_CTL_LEFT_ARROW),0, A_LLSHIFT,
109 '{',0, A_F_BRACKET|A_EXTRA, '{','}',0,
110 '}',0, A_B_BRACKET|A_EXTRA, '{','}',0,
111 '(',0, A_F_BRACKET|A_EXTRA, '(',')',0,
112 ')',0, A_B_BRACKET|A_EXTRA, '(',')',0,
113 '[',0, A_F_BRACKET|A_EXTRA, '[',']',0,
114 ']',0, A_B_BRACKET|A_EXTRA, '[',']',0,
115 ESC,CONTROL('F'),0, A_F_BRACKET,
116 ESC,CONTROL('B'),0, A_B_BRACKET,
117 'G',0, A_GOEND,
118 ESC,'G',0, A_GOEND_BUF,
119 ESC,'>',0, A_GOEND,
120 '>',0, A_GOEND,
121 SK(SK_END),0, A_GOEND,
122 'P',0, A_GOPOS,
123
124 '0',0, A_DIGIT,
125 '1',0, A_DIGIT,
126 '2',0, A_DIGIT,
127 '3',0, A_DIGIT,
128 '4',0, A_DIGIT,
129 '5',0, A_DIGIT,
130 '6',0, A_DIGIT,
131 '7',0, A_DIGIT,
132 '8',0, A_DIGIT,
133 '9',0, A_DIGIT,
134 '.',0, A_DIGIT,
135
136 '=',0, A_STAT,
137 CONTROL('G'),0, A_STAT,
138 ':','f',0, A_STAT,
139 '/',0, A_F_SEARCH,
140 '?',0, A_B_SEARCH,
141 ESC,'/',0, A_F_SEARCH|A_EXTRA, '*',0,
142 ESC,'?',0, A_B_SEARCH|A_EXTRA, '*',0,
143 'n',0, A_AGAIN_SEARCH,
144 ESC,'n',0, A_T_AGAIN_SEARCH,
145 'N',0, A_REVERSE_SEARCH,
146 ESC,'N',0, A_T_REVERSE_SEARCH,
147 '&',0, A_FILTER,
148 'm',0, A_SETMARK,
149 'M',0, A_SETMARKBOT,
150 ESC,'m',0, A_CLRMARK,
151 '\'',0, A_GOMARK,
152 CONTROL('X'),CONTROL('X'),0, A_GOMARK,
153 'E',0, A_EXAMINE,
154 ':','e',0, A_EXAMINE,
155 CONTROL('X'),CONTROL('V'),0, A_EXAMINE,
156 ':','n',0, A_NEXT_FILE,
157 ':','p',0, A_PREV_FILE,
158 CONTROL('O'),CONTROL('N'),0, A_OSC8_F_SEARCH,
159 CONTROL('O'),'n',0, A_OSC8_F_SEARCH,
160 CONTROL('O'),CONTROL('P'),0, A_OSC8_B_SEARCH,
161 CONTROL('O'),'p',0, A_OSC8_B_SEARCH,
162 CONTROL('O'),CONTROL('O'),0, A_OSC8_OPEN,
163 CONTROL('O'),'o',0, A_OSC8_OPEN,
164 CONTROL('O'),CONTROL('L'),0, A_OSC8_JUMP,
165 CONTROL('O'),'l',0, A_OSC8_JUMP,
166 't',0, A_NEXT_TAG,
167 'T',0, A_PREV_TAG,
168 ':','x',0, A_INDEX_FILE,
169 ':','d',0, A_REMOVE_FILE,
170 '-',0, A_OPT_TOGGLE,
171 ':','t',0, A_OPT_TOGGLE|A_EXTRA, 't',0,
172 's',0, A_OPT_TOGGLE|A_EXTRA, 'o',0,
173 '_',0, A_DISP_OPTION,
174 '|',0, A_PIPE,
175 'v',0, A_VISUAL,
176 '!',0, A_SHELL,
177 '#',0, A_PSHELL,
178 '+',0, A_FIRSTCMD,
179
180 'H',0, A_HELP,
181 'h',0, A_HELP,
182 SK(SK_F1),0, A_HELP,
183 'V',0, A_VERSION,
184 'q',0, A_QUIT,
185 'Q',0, A_QUIT,
186 ':','q',0, A_QUIT,
187 ':','Q',0, A_QUIT,
188 'Z','Z',0, A_QUIT
189 };
190
191 static unsigned char edittable[] =
192 {
193 '\t',0, EC_F_COMPLETE, /* TAB */
194 '\17',0, EC_B_COMPLETE, /* BACKTAB */
195 SK(SK_BACKTAB),0, EC_B_COMPLETE, /* BACKTAB */
196 ESC,'\t',0, EC_B_COMPLETE, /* ESC TAB */
197 CONTROL('L'),0, EC_EXPAND, /* CTRL-L */
198 CONTROL('V'),0, EC_LITERAL, /* BACKSLASH */
199 CONTROL('A'),0, EC_LITERAL, /* BACKSLASH */
200 ESC,'l',0, EC_RIGHT, /* ESC l */
201 SK(SK_RIGHT_ARROW),0, EC_RIGHT, /* RIGHTARROW */
202 ESC,'h',0, EC_LEFT, /* ESC h */
203 SK(SK_LEFT_ARROW),0, EC_LEFT, /* LEFTARROW */
204 ESC,'b',0, EC_W_LEFT, /* ESC b */
205 ESC,SK(SK_LEFT_ARROW),0, EC_W_LEFT, /* ESC LEFTARROW */
206 SK(SK_CTL_LEFT_ARROW),0, EC_W_LEFT, /* CTRL-LEFTARROW */
207 ESC,'w',0, EC_W_RIGHT, /* ESC w */
208 ESC,SK(SK_RIGHT_ARROW),0, EC_W_RIGHT, /* ESC RIGHTARROW */
209 SK(SK_CTL_RIGHT_ARROW),0, EC_W_RIGHT, /* CTRL-RIGHTARROW */
210 ESC,'i',0, EC_INSERT, /* ESC i */
211 SK(SK_INSERT),0, EC_INSERT, /* INSERT */
212 ESC,'x',0, EC_DELETE, /* ESC x */
213 SK(SK_DELETE),0, EC_DELETE, /* DELETE */
214 ESC,'X',0, EC_W_DELETE, /* ESC X */
215 ESC,SK(SK_DELETE),0, EC_W_DELETE, /* ESC DELETE */
216 SK(SK_CTL_DELETE),0, EC_W_DELETE, /* CTRL-DELETE */
217 SK(SK_CTL_BACKSPACE),0, EC_W_BACKSPACE, /* CTRL-BACKSPACE */
218 ESC,SK(SK_BACKSPACE),0, EC_W_BACKSPACE, /* ESC BACKSPACE */
219 ESC,'0',0, EC_HOME, /* ESC 0 */
220 SK(SK_HOME),0, EC_HOME, /* HOME */
221 ESC,'$',0, EC_END, /* ESC $ */
222 SK(SK_END),0, EC_END, /* END */
223 ESC,'k',0, EC_UP, /* ESC k */
224 SK(SK_UP_ARROW),0, EC_UP, /* UPARROW */
225 ESC,'j',0, EC_DOWN, /* ESC j */
226 SK(SK_DOWN_ARROW),0, EC_DOWN, /* DOWNARROW */
227 CONTROL('G'),0, EC_ABORT, /* CTRL-G */
228 ESC,'[','M',0, EC_X11MOUSE, /* X11 mouse report */
229 ESC,'[','<',0, EC_X116MOUSE, /* X11 1006 mouse report */
230 };
231
232 static unsigned char dflt_vartable[] =
233 {
234 'L','E','S','S','_','O','S','C','8','_','m','a','n', 0, EV_OK|A_EXTRA,
235 /* echo '%o' | sed -e "s,^man\:\\([^(]*\\)( *\\([^)]*\\)\.*,-man '\\2' '\\1'," -e"t X" -e"s,\.*,-echo Invalid man link," -e"\: X" */
236 'e','c','h','o',' ','\'','%','o','\'',' ','|',' ','s','e','d',' ','-','e',' ','"','s',',','^','m','a','n','\\',':','\\','\\','(','[','^','(',']','*','\\','\\',')','(',' ','*','\\','\\','(','[','^',')',']','*','\\','\\',')','\\','.','*',',','-','m','a','n',' ','\'','\\','\\','2','\'',' ','\'','\\','\\','1','\'',',','"',' ','-','e','"','t',' ','X','"',' ','-','e','"','s',',','\\','.','*',',','-','e','c','h','o',' ','I','n','v','a','l','i','d',' ','m','a','n',' ','l','i','n','k',',','"',' ','-','e','"','\\',':',' ','X','"',
237 0,
238
239 'L','E','S','S','_','O','S','C','8','_','f','i','l','e', 0, EV_OK|A_EXTRA,
240 /* eval `echo '%o' | sed -e "s,^file://\\([^/]*\\)\\(.*\\),_H=\\1;_P=\\2;_E=0," -e"t X" -e"s,.*,_E=1," -e": X"`; if [ "$_E" = 1 ]; then echo -echo Invalid file link; elif [ -z "$_H" -o "$_H" = localhost -o "$_H" = $HOSTNAME ]; then echo ":e $_P"; else echo -echo Cannot open remote file on "$_H"; fi */
241 'e','v','a','l',' ','`','e','c','h','o',' ','\'','%','o','\'',' ','|',' ','s','e','d',' ','-','e',' ','"','s',',','^','f','i','l','e','\\',':','/','/','\\','\\','(','[','^','/',']','*','\\','\\',')','\\','\\','(','\\','.','*','\\','\\',')',',','_','H','=','\\','\\','1',';','_','P','=','\\','\\','2',';','_','E','=','0',',','"',' ','-','e','"','t',' ','X','"',' ','-','e','"','s',',','\\','.','*',',','_','E','=','1',',','"',' ','-','e','"','\\',':',' ','X','"','`',';',' ','i','f',' ','[',' ','"','$','_','E','"',' ','=',' ','1',' ',']',';',' ','t','h','e','n',' ','e','c','h','o',' ','-','e','c','h','o',' ','I','n','v','a','l','i','d',' ','f','i','l','e',' ','l','i','n','k',';',' ','e','l','i','f',' ','[',' ','-','z',' ','"','$','_','H','"',' ','-','o',' ','"','$','_','H','"',' ','=',' ','l','o','c','a','l','h','o','s','t',' ','-','o',' ','"','$','_','H','"',' ','=',' ','$','H','O','S','T','N','A','M','E',' ',']',';',' ','t','h','e','n',' ','e','c','h','o',' ','"','\\',':','e',' ','$','_','P','"',';',' ','e','l','s','e',' ','e','c','h','o',' ','-','e','c','h','o',' ','C','a','n','n','o','t',' ','o','p','e','n',' ','r','e','m','o','t','e',' ','f','i','l','e',' ','o','n',' ','"','$','_','H','"',';',' ','f','i',
242 0,
243 };
244
245 /*
246 * Structure to support a list of command tables.
247 */
248 struct tablelist
249 {
250 struct tablelist *t_next;
251 unsigned char *t_start;
252 unsigned char *t_end;
253 };
254
255 /*
256 * List of command tables and list of line-edit tables.
257 */
258 static struct tablelist *list_fcmd_tables = NULL;
259 static struct tablelist *list_ecmd_tables = NULL;
260 static struct tablelist *list_var_tables = NULL;
261 static struct tablelist *list_sysvar_tables = NULL;
262
263
264 /*
265 * Expand special key abbreviations in a command table.
266 */
expand_special_keys(unsigned char * table,size_t len)267 static void expand_special_keys(unsigned char *table, size_t len)
268 {
269 unsigned char *fm;
270 unsigned char *to;
271 int a;
272 constant char *repl;
273 size_t klen;
274
275 for (fm = table; fm < table + len; )
276 {
277 /*
278 * Rewrite each command in the table with any
279 * special key abbreviations expanded.
280 */
281 for (to = fm; *fm != '\0'; )
282 {
283 if (*fm != SK_SPECIAL_KEY)
284 {
285 *to++ = *fm++;
286 continue;
287 }
288 /*
289 * After SK_SPECIAL_KEY, next byte is the type
290 * of special key (one of the SK_* constants),
291 * and the byte after that is the number of bytes,
292 * N, reserved by the abbreviation (including the
293 * SK_SPECIAL_KEY and key type bytes).
294 * Replace all N bytes with the actual bytes
295 * output by the special key on this terminal.
296 */
297 repl = special_key_str(fm[1]);
298 klen = fm[2] & 0377;
299 fm += klen;
300 if (repl == NULL || strlen(repl) > klen)
301 repl = "\377";
302 while (*repl != '\0')
303 *to++ = (unsigned char) *repl++; /*{{type-issue}}*/
304 }
305 *to++ = '\0';
306 /*
307 * Fill any unused bytes between end of command and
308 * the action byte with A_SKIP.
309 */
310 while (to <= fm)
311 *to++ = A_SKIP;
312 fm++;
313 a = *fm++ & 0377;
314 if (a & A_EXTRA)
315 {
316 while (*fm++ != '\0')
317 continue;
318 }
319 }
320 }
321
322 /*
323 * Expand special key abbreviations in a list of command tables.
324 */
expand_cmd_table(struct tablelist * tlist)325 static void expand_cmd_table(struct tablelist *tlist)
326 {
327 struct tablelist *t;
328 for (t = tlist; t != NULL; t = t->t_next)
329 {
330 expand_special_keys(t->t_start, ptr_diff(t->t_end, t->t_start));
331 }
332 }
333
334 /*
335 * Expand special key abbreviations in all command tables.
336 */
expand_cmd_tables(void)337 public void expand_cmd_tables(void)
338 {
339 expand_cmd_table(list_fcmd_tables);
340 expand_cmd_table(list_ecmd_tables);
341 expand_cmd_table(list_var_tables);
342 expand_cmd_table(list_sysvar_tables);
343 }
344
345 /*
346 * Initialize the command lists.
347 */
init_cmds(void)348 public void init_cmds(void)
349 {
350 /*
351 * Add the default command tables.
352 */
353 add_fcmd_table(cmdtable, sizeof(cmdtable));
354 add_ecmd_table(edittable, sizeof(edittable));
355 add_sysvar_table(dflt_vartable, sizeof(dflt_vartable));
356 #if USERFILE
357 #ifdef BINDIR /* For backwards compatibility */
358 /* Try to add tables in the OLD system lesskey file. */
359 add_hometable(lesskey, NULL, BINDIR "/.sysless", TRUE);
360 #endif
361 /*
362 * Try to load lesskey source file or binary file.
363 * If the source file succeeds, don't load binary file.
364 * The binary file is likely to have been generated from
365 * a (possibly out of date) copy of the src file,
366 * so loading it is at best redundant.
367 */
368 /*
369 * Try to add tables in system lesskey src file.
370 */
371 #if HAVE_LESSKEYSRC
372 if (add_hometable(lesskey_src, "LESSKEYIN_SYSTEM", LESSKEYINFILE_SYS, TRUE) != 0)
373 #endif
374 {
375 /*
376 * Try to add the tables in the system lesskey binary file.
377 */
378 add_hometable(lesskey, "LESSKEY_SYSTEM", LESSKEYFILE_SYS, TRUE);
379 }
380 /*
381 * Try to add tables in the lesskey src file "$HOME/.lesskey".
382 */
383 #if HAVE_LESSKEYSRC
384 if (add_hometable(lesskey_src, "LESSKEYIN", DEF_LESSKEYINFILE, FALSE) != 0)
385 #endif
386 {
387 /*
388 * Try to add the tables in the standard lesskey binary file "$HOME/.less".
389 */
390 add_hometable(lesskey, "LESSKEY", LESSKEYFILE, FALSE);
391 }
392 #endif
393
394 add_content_table(lesskey_content, "LESSKEY_CONTENT_SYSTEM", TRUE);
395 add_content_table(lesskey_content, "LESSKEY_CONTENT", FALSE);
396 }
397
398 /*
399 * Add a command table.
400 */
add_cmd_table(struct tablelist ** tlist,unsigned char * buf,size_t len)401 static int add_cmd_table(struct tablelist **tlist, unsigned char *buf, size_t len)
402 {
403 struct tablelist *t;
404
405 if (len == 0)
406 return (0);
407 /*
408 * Allocate a tablelist structure, initialize it,
409 * and link it into the list of tables.
410 */
411 if ((t = (struct tablelist *)
412 calloc(1, sizeof(struct tablelist))) == NULL)
413 {
414 return (-1);
415 }
416 t->t_start = buf;
417 t->t_end = buf + len;
418 t->t_next = NULL;
419 if (*tlist == NULL)
420 *tlist = t;
421 else
422 {
423 struct tablelist *e;
424 for (e = *tlist; e->t_next != NULL; e = e->t_next)
425 continue;
426 e->t_next = t;
427 }
428 return (0);
429 }
430
431 /*
432 * Remove the last command table in a list.
433 */
pop_cmd_table(struct tablelist ** tlist)434 static void pop_cmd_table(struct tablelist **tlist)
435 {
436 struct tablelist *t;
437 if (*tlist == NULL)
438 return;
439 if ((*tlist)->t_next == NULL)
440 {
441 t = *tlist;
442 *tlist = NULL;
443 } else
444 {
445 struct tablelist *e;
446 for (e = *tlist; e->t_next->t_next != NULL; e = e->t_next)
447 continue;
448 t = e->t_next;
449 e->t_next = NULL;
450 }
451 free(t);
452 }
453
454 /*
455 * Add a command table.
456 */
add_fcmd_table(unsigned char * buf,size_t len)457 public void add_fcmd_table(unsigned char *buf, size_t len)
458 {
459 if (add_cmd_table(&list_fcmd_tables, buf, len) < 0)
460 error("Warning: some commands disabled", NULL_PARG);
461 }
462
463 /*
464 * Add an editing command table.
465 */
add_ecmd_table(unsigned char * buf,size_t len)466 public void add_ecmd_table(unsigned char *buf, size_t len)
467 {
468 if (add_cmd_table(&list_ecmd_tables, buf, len) < 0)
469 error("Warning: some edit commands disabled", NULL_PARG);
470 }
471
472 /*
473 * Add an environment variable table.
474 */
add_var_table(struct tablelist ** tlist,unsigned char * buf,size_t len)475 static void add_var_table(struct tablelist **tlist, unsigned char *buf, size_t len)
476 {
477 struct xbuffer xbuf;
478
479 xbuf_init(&xbuf);
480 expand_evars((char*)buf, len, &xbuf); /*{{unsigned-issue}}*/
481 /* {{ We leak the table in buf. expand_evars scribbled in it so it's useless anyway. }} */
482 if (add_cmd_table(tlist, xbuf.data, xbuf.end) < 0)
483 error("Warning: environment variables from lesskey file unavailable", NULL_PARG);
484 }
485
add_uvar_table(unsigned char * buf,size_t len)486 public void add_uvar_table(unsigned char *buf, size_t len)
487 {
488 add_var_table(&list_var_tables, buf, len);
489 }
490
add_sysvar_table(unsigned char * buf,size_t len)491 public void add_sysvar_table(unsigned char *buf, size_t len)
492 {
493 add_var_table(&list_sysvar_tables, buf, len);
494 }
495
496 /*
497 * Return action for a mouse wheel down event.
498 */
mouse_wheel_down(void)499 static int mouse_wheel_down(void)
500 {
501 return ((mousecap == OPT_ONPLUS) ? A_B_MOUSE : A_F_MOUSE);
502 }
503
504 /*
505 * Return action for a mouse wheel up event.
506 */
mouse_wheel_up(void)507 static int mouse_wheel_up(void)
508 {
509 return ((mousecap == OPT_ONPLUS) ? A_F_MOUSE : A_B_MOUSE);
510 }
511
512 /*
513 * Return action for the left mouse button trigger.
514 */
mouse_button_left(int x,int y)515 static int mouse_button_left(int x, int y)
516 {
517 /*
518 * {{ It would be better to return an action and then do this
519 * in commands() but it's nontrivial to pass y to it. }}
520 */
521 #if OSC8_LINK
522 if (osc8_click(y, x))
523 return (A_NOACTION);
524 #else
525 (void) x;
526 #endif /* OSC8_LINK */
527 if (y < sc_height-1)
528 {
529 setmark('#', y);
530 screen_trashed();
531 }
532 return (A_NOACTION);
533 }
534
535 /*
536 * Return action for the right mouse button trigger.
537 */
mouse_button_right(int x,int y)538 static int mouse_button_right(int x, int y)
539 {
540 (void) x;
541 /*
542 * {{ unlike mouse_button_left, we could return an action,
543 * but keep it near mouse_button_left for readability. }}
544 */
545 if (y < sc_height-1)
546 {
547 gomark('#');
548 screen_trashed();
549 }
550 return (A_NOACTION);
551 }
552
553 /*
554 * Read a decimal integer. Return the integer and set *pterm to the terminating char.
555 */
getcc_int(char * pterm)556 static int getcc_int(char *pterm)
557 {
558 int num = 0;
559 int digits = 0;
560 for (;;)
561 {
562 char ch = getcc();
563 if (ch < '0' || ch > '9')
564 {
565 if (pterm != NULL) *pterm = ch;
566 if (digits == 0)
567 return (-1);
568 return (num);
569 }
570 if (ckd_mul(&num, num, 10) || ckd_add(&num, num, ch - '0'))
571 return -1;
572 ++digits;
573 }
574 }
575
576 /*
577 * Read suffix of mouse input and return the action to take.
578 * The prefix ("\e[M") has already been read.
579 */
x11mouse_action(int skip)580 static int x11mouse_action(int skip)
581 {
582 static int prev_b = X11MOUSE_BUTTON_REL;
583 int b = getcc() - X11MOUSE_OFFSET;
584 int x = getcc() - X11MOUSE_OFFSET-1;
585 int y = getcc() - X11MOUSE_OFFSET-1;
586 if (skip)
587 return (A_NOACTION);
588 switch (b) {
589 default:
590 prev_b = b;
591 return (A_NOACTION);
592 case X11MOUSE_WHEEL_DOWN:
593 return mouse_wheel_down();
594 case X11MOUSE_WHEEL_UP:
595 return mouse_wheel_up();
596 case X11MOUSE_BUTTON_REL:
597 /* to trigger on button-up, we check the last button-down */
598 switch (prev_b) {
599 case X11MOUSE_BUTTON1:
600 return mouse_button_left(x, y);
601 /* is BUTTON2 the rightmost with 2-buttons mouse? */
602 case X11MOUSE_BUTTON2:
603 case X11MOUSE_BUTTON3:
604 return mouse_button_right(x, y);
605 }
606 return (A_NOACTION);
607 }
608 }
609
610 /*
611 * Read suffix of mouse input and return the action to take.
612 * The prefix ("\e[<") has already been read.
613 */
x116mouse_action(int skip)614 static int x116mouse_action(int skip)
615 {
616 char ch;
617 int x, y;
618 int b = getcc_int(&ch);
619 if (b < 0 || ch != ';') return (A_NOACTION);
620 x = getcc_int(&ch) - 1;
621 if (x < 0 || ch != ';') return (A_NOACTION);
622 y = getcc_int(&ch) - 1;
623 if (y < 0) return (A_NOACTION);
624 if (skip)
625 return (A_NOACTION);
626 switch (b) {
627 case X11MOUSE_WHEEL_DOWN:
628 return mouse_wheel_down();
629 case X11MOUSE_WHEEL_UP:
630 return mouse_wheel_up();
631 case X11MOUSE_BUTTON1:
632 if (ch != 'm') return (A_NOACTION);
633 return mouse_button_left(x, y);
634 default:
635 if (ch != 'm') return (A_NOACTION);
636 /* any other button release */
637 return mouse_button_right(x, y);
638 }
639 }
640
641 /*
642 * Search a single command table for the command string in cmd.
643 */
cmd_search(constant char * cmd,constant char * table,constant char * endtable,constant char ** sp)644 static int cmd_search(constant char *cmd, constant char *table, constant char *endtable, constant char **sp)
645 {
646 constant char *p;
647 constant char *q;
648 int a = A_INVALID;
649
650 *sp = NULL;
651 for (p = table, q = cmd; p < endtable; p++, q++)
652 {
653 if (*p == *q)
654 {
655 /*
656 * Current characters match.
657 * If we're at the end of the string, we've found it.
658 * Return the action code, which is the character
659 * after the null at the end of the string
660 * in the command table.
661 */
662 if (*p == '\0')
663 {
664 a = *++p & 0377;
665 while (a == A_SKIP)
666 a = *++p & 0377;
667 if (a == A_END_LIST)
668 {
669 /*
670 * We get here only if the original
671 * cmd string passed in was empty ("").
672 * I don't think that can happen,
673 * but just in case ...
674 */
675 return (A_UINVALID);
676 }
677 /*
678 * Check for an "extra" string.
679 */
680 if (a & A_EXTRA)
681 {
682 *sp = ++p;
683 while (*p != '\0')
684 ++p;
685 a &= ~A_EXTRA;
686 }
687 if (a == A_X11MOUSE_IN)
688 a = x11mouse_action(0);
689 else if (a == A_X116MOUSE_IN)
690 a = x116mouse_action(0);
691 q = cmd-1;
692 }
693 } else if (*q == '\0')
694 {
695 /*
696 * Hit the end of the user's command,
697 * but not the end of the string in the command table.
698 * The user's command is incomplete.
699 */
700 if (a == A_INVALID)
701 a = A_PREFIX;
702 q = cmd-1;
703 } else
704 {
705 /*
706 * Not a match.
707 * Skip ahead to the next command in the
708 * command table, and reset the pointer
709 * to the beginning of the user's command.
710 */
711 if (*p == '\0' && p[1] == A_END_LIST)
712 {
713 /*
714 * A_END_LIST is a special marker that tells
715 * us to abort the cmd search.
716 */
717 return (A_UINVALID);
718 }
719 while (*p++ != '\0')
720 continue;
721 while (*p == A_SKIP)
722 p++;
723 if (*p & A_EXTRA)
724 while (*++p != '\0')
725 continue;
726 q = cmd-1;
727 }
728 }
729 return (a);
730 }
731
732 /*
733 * Decode a command character and return the associated action.
734 * The "extra" string, if any, is returned in sp.
735 */
cmd_decode(struct tablelist * tlist,constant char * cmd,constant char ** sp)736 static int cmd_decode(struct tablelist *tlist, constant char *cmd, constant char **sp)
737 {
738 struct tablelist *t;
739 int action = A_INVALID;
740
741 /*
742 * Search for the cmd thru all the command tables.
743 * If we find it more than once, take the last one.
744 */
745 *sp = NULL;
746 for (t = tlist; t != NULL; t = t->t_next)
747 {
748 constant char *tsp;
749 int taction = cmd_search(cmd, (char *) t->t_start, (char *) t->t_end, &tsp);
750 if (taction == A_UINVALID)
751 taction = A_INVALID;
752 if (taction != A_INVALID)
753 {
754 action = taction;
755 *sp = tsp;
756 }
757 }
758 return (action);
759 }
760
761 /*
762 * Decode a command from the cmdtables list.
763 */
fcmd_decode(constant char * cmd,constant char ** sp)764 public int fcmd_decode(constant char *cmd, constant char **sp)
765 {
766 return (cmd_decode(list_fcmd_tables, cmd, sp));
767 }
768
769 /*
770 * Decode a command from the edittables list.
771 */
ecmd_decode(constant char * cmd,constant char ** sp)772 public int ecmd_decode(constant char *cmd, constant char **sp)
773 {
774 return (cmd_decode(list_ecmd_tables, cmd, sp));
775 }
776
777 /*
778 * Get the value of an environment variable.
779 * Looks first in the lesskey file, then in the real environment.
780 */
lgetenv(constant char * var)781 public constant char * lgetenv(constant char *var)
782 {
783 int a;
784 constant char *s;
785
786 a = cmd_decode(list_var_tables, var, &s);
787 if (a == EV_OK)
788 return (s);
789 s = getenv(var);
790 if (s != NULL && *s != '\0')
791 return (s);
792 a = cmd_decode(list_sysvar_tables, var, &s);
793 if (a == EV_OK)
794 return (s);
795 return (NULL);
796 }
797
798 /*
799 * Like lgetenv, but also uses a buffer partially filled with an env table.
800 */
lgetenv_ext(constant char * var,unsigned char * env_buf,size_t env_buf_len)801 public constant char * lgetenv_ext(constant char *var, unsigned char *env_buf, size_t env_buf_len)
802 {
803 constant char *r;
804 size_t e;
805 size_t env_end = 0;
806
807 for (e = 0;;)
808 {
809 for (; e < env_buf_len; e++)
810 if (env_buf[e] == '\0')
811 break;
812 if (e >= env_buf_len) break;
813 if (env_buf[++e] & A_EXTRA)
814 {
815 for (e = e+1; e < env_buf_len; e++)
816 if (env_buf[e] == '\0')
817 break;
818 }
819 e++;
820 if (e >= env_buf_len) break;
821 env_end = e;
822 }
823 /* Temporarily add env_buf to var_tables, do the lookup, then remove it. */
824 add_uvar_table(env_buf, env_end);
825 r = lgetenv(var);
826 pop_cmd_table(&list_var_tables);
827 return r;
828 }
829
830 /*
831 * Is a string null or empty?
832 */
isnullenv(constant char * s)833 public lbool isnullenv(constant char *s)
834 {
835 return (s == NULL || *s == '\0');
836 }
837
838 #if USERFILE
839 /*
840 * Get an "integer" from a lesskey file.
841 * Integers are stored in a funny format:
842 * two bytes, low order first, in radix KRADIX.
843 */
gint(unsigned char ** sp)844 static size_t gint(unsigned char **sp)
845 {
846 size_t n;
847
848 n = *(*sp)++;
849 n += *(*sp)++ * KRADIX;
850 return (n);
851 }
852
853 /*
854 * Process an old (pre-v241) lesskey file.
855 */
old_lesskey(unsigned char * buf,size_t len)856 static int old_lesskey(unsigned char *buf, size_t len)
857 {
858 /*
859 * Old-style lesskey file.
860 * The file must end with either
861 * ...,cmd,0,action
862 * or ...,cmd,0,action|A_EXTRA,string,0
863 * So the last byte or the second to last byte must be zero.
864 */
865 if (buf[len-1] != '\0' && buf[len-2] != '\0')
866 return (-1);
867 add_fcmd_table(buf, len);
868 return (0);
869 }
870
871 /*
872 * Process a new (post-v241) lesskey file.
873 */
new_lesskey(unsigned char * buf,size_t len,lbool sysvar)874 static int new_lesskey(unsigned char *buf, size_t len, lbool sysvar)
875 {
876 unsigned char *p;
877 unsigned char *end;
878 int c;
879 size_t n;
880
881 /*
882 * New-style lesskey file.
883 * Extract the pieces.
884 */
885 if (buf[len-3] != C0_END_LESSKEY_MAGIC ||
886 buf[len-2] != C1_END_LESSKEY_MAGIC ||
887 buf[len-1] != C2_END_LESSKEY_MAGIC)
888 return (-1);
889 p = buf + 4;
890 end = buf + len;
891 for (;;)
892 {
893 c = *p++;
894 switch (c)
895 {
896 case CMD_SECTION:
897 n = gint(&p);
898 if (p+n >= end)
899 return (-1);
900 add_fcmd_table(p, n);
901 p += n;
902 break;
903 case EDIT_SECTION:
904 n = gint(&p);
905 if (p+n >= end)
906 return (-1);
907 add_ecmd_table(p, n);
908 p += n;
909 break;
910 case VAR_SECTION:
911 n = gint(&p);
912 if (p+n >= end)
913 return (-1);
914 if (sysvar)
915 add_sysvar_table(p, n);
916 else
917 add_uvar_table(p, n);
918 p += n;
919 break;
920 case END_SECTION:
921 return (0);
922 default:
923 /*
924 * Unrecognized section type.
925 */
926 return (-1);
927 }
928 }
929 }
930
931 /*
932 * Set up a user command table, based on a "lesskey" file.
933 */
lesskey(constant char * filename,lbool sysvar)934 public int lesskey(constant char *filename, lbool sysvar)
935 {
936 unsigned char *buf;
937 POSITION len;
938 ssize_t n;
939 int f;
940
941 if (!secure_allow(SF_LESSKEY))
942 return (1);
943 /*
944 * Try to open the lesskey file.
945 */
946 f = open(filename, OPEN_READ);
947 if (f < 0)
948 return (1);
949
950 /*
951 * Read the file into a buffer.
952 * We first figure out the size of the file and allocate space for it.
953 * {{ Minimal error checking is done here.
954 * A garbage .less file will produce strange results.
955 * To avoid a large amount of error checking code here, we
956 * rely on the lesskey program to generate a good .less file. }}
957 */
958 len = filesize(f);
959 if (len == NULL_POSITION || len < 3)
960 {
961 /*
962 * Bad file (valid file must have at least 3 chars).
963 */
964 close(f);
965 return (-1);
966 }
967 if ((buf = (unsigned char *) calloc((size_t)len, sizeof(char))) == NULL)
968 {
969 close(f);
970 return (-1);
971 }
972 if (less_lseek(f, (less_off_t)0, SEEK_SET) == BAD_LSEEK)
973 {
974 free(buf);
975 close(f);
976 return (-1);
977 }
978 n = read(f, buf, (size_t) len);
979 close(f);
980 if (n != len)
981 {
982 free(buf);
983 return (-1);
984 }
985
986 /*
987 * Figure out if this is an old-style (before version 241)
988 * or new-style lesskey file format.
989 */
990 if (len < 4 ||
991 buf[0] != C0_LESSKEY_MAGIC || buf[1] != C1_LESSKEY_MAGIC ||
992 buf[2] != C2_LESSKEY_MAGIC || buf[3] != C3_LESSKEY_MAGIC)
993 return (old_lesskey(buf, (size_t) len));
994 return (new_lesskey(buf, (size_t) len, sysvar));
995 }
996
997 #if HAVE_LESSKEYSRC
lesskey_text(constant char * filename,lbool sysvar,lbool content)998 static int lesskey_text(constant char *filename, lbool sysvar, lbool content)
999 {
1000 static struct lesskey_tables tables;
1001 if (!secure_allow(SF_LESSKEY))
1002 return (1);
1003 int r = content ? parse_lesskey_content(filename, &tables) : parse_lesskey(filename, &tables);
1004 if (r != 0)
1005 return (r);
1006 add_fcmd_table(tables.cmdtable.buf.data, tables.cmdtable.buf.end);
1007 add_ecmd_table(tables.edittable.buf.data, tables.edittable.buf.end);
1008 if (sysvar)
1009 add_sysvar_table(tables.vartable.buf.data, tables.vartable.buf.end);
1010 else
1011 add_uvar_table(tables.vartable.buf.data, tables.vartable.buf.end);
1012 return (0);
1013 }
1014
lesskey_src(constant char * filename,lbool sysvar)1015 public int lesskey_src(constant char *filename, lbool sysvar)
1016 {
1017 return lesskey_text(filename, sysvar, FALSE);
1018 }
1019
lesskey_content(constant char * content,lbool sysvar)1020 public int lesskey_content(constant char *content, lbool sysvar)
1021 {
1022 return lesskey_text(content, sysvar, TRUE);
1023 }
1024
lesskey_parse_error(char * s)1025 void lesskey_parse_error(char *s)
1026 {
1027 PARG parg;
1028 parg.p_string = s;
1029 error("%s", &parg);
1030 }
1031 #endif /* HAVE_LESSKEYSRC */
1032
1033 /*
1034 * Add a lesskey file.
1035 */
add_hometable(int (* call_lesskey)(constant char *,lbool),constant char * envname,constant char * def_filename,lbool sysvar)1036 static int add_hometable(int (*call_lesskey)(constant char *, lbool), constant char *envname, constant char *def_filename, lbool sysvar)
1037 {
1038 char *filename = NULL;
1039 constant char *efilename;
1040 int r;
1041
1042 if (envname != NULL && (efilename = lgetenv(envname)) != NULL)
1043 filename = save(efilename);
1044 else if (sysvar) /* def_filename is full path */
1045 filename = save(def_filename);
1046 else /* def_filename is just basename */
1047 {
1048 /* Remove first char (normally a dot) unless stored in $HOME. */
1049 constant char *xdg = lgetenv("XDG_CONFIG_HOME");
1050 if (!isnullenv(xdg))
1051 filename = dirfile(xdg, &def_filename[1], 1);
1052 if (filename == NULL)
1053 {
1054 constant char *home = lgetenv("HOME");
1055 if (!isnullenv(home))
1056 {
1057 char *cfg_dir = dirfile(home, ".config", 0);
1058 filename = dirfile(cfg_dir, &def_filename[1], 1);
1059 free(cfg_dir);
1060 }
1061 }
1062 if (filename == NULL)
1063 filename = homefile(def_filename);
1064 }
1065 if (filename == NULL)
1066 return -1;
1067 r = (*call_lesskey)(filename, sysvar);
1068 free(filename);
1069 return (r);
1070 }
1071
1072 /*
1073 * Add the content of a lesskey source file.
1074 */
add_content_table(int (* call_lesskey)(constant char *,lbool),constant char * envname,lbool sysvar)1075 static void add_content_table(int (*call_lesskey)(constant char *, lbool), constant char *envname, lbool sysvar)
1076 {
1077 (void) call_lesskey; /* not used */
1078 constant char *content = lgetenv(envname);
1079 if (isnullenv(content))
1080 return;
1081 lesskey_content(content, sysvar);
1082 }
1083 #endif /* USERFILE */
1084
1085 /*
1086 * See if a char is a special line-editing command.
1087 */
editchar(char c,int flags)1088 public int editchar(char c, int flags)
1089 {
1090 int action;
1091 int nch;
1092 constant char *s;
1093 char usercmd[MAX_CMDLEN+1];
1094
1095 /*
1096 * An editing character could actually be a sequence of characters;
1097 * for example, an escape sequence sent by pressing the uparrow key.
1098 * To match the editing string, we use the command decoder
1099 * but give it the edit-commands command table
1100 * This table is constructed to match the user's keyboard.
1101 */
1102 if (c == erase_char || c == erase2_char)
1103 return (EC_BACKSPACE);
1104 if (c == kill_char)
1105 {
1106 #if MSDOS_COMPILER==WIN32C
1107 if (!win32_kbhit())
1108 #endif
1109 return (EC_LINEKILL);
1110 }
1111
1112 /*
1113 * Collect characters in a buffer.
1114 * Start with the one we have, and get more if we need them.
1115 */
1116 nch = 0;
1117 do {
1118 if (nch > 0)
1119 c = getcc();
1120 usercmd[nch] = c;
1121 usercmd[nch+1] = '\0';
1122 nch++;
1123 action = ecmd_decode(usercmd, &s);
1124 } while (action == A_PREFIX && nch < MAX_CMDLEN);
1125
1126 if (action == EC_X11MOUSE)
1127 return (x11mouse_action(1));
1128 if (action == EC_X116MOUSE)
1129 return (x116mouse_action(1));
1130
1131 if (flags & ECF_NORIGHTLEFT)
1132 {
1133 switch (action)
1134 {
1135 case EC_RIGHT:
1136 case EC_LEFT:
1137 action = A_INVALID;
1138 break;
1139 }
1140 }
1141 #if CMD_HISTORY
1142 if (flags & ECF_NOHISTORY)
1143 {
1144 /*
1145 * The caller says there is no history list.
1146 * Reject any history-manipulation action.
1147 */
1148 switch (action)
1149 {
1150 case EC_UP:
1151 case EC_DOWN:
1152 action = A_INVALID;
1153 break;
1154 }
1155 }
1156 #endif
1157 #if TAB_COMPLETE_FILENAME
1158 if (flags & ECF_NOCOMPLETE)
1159 {
1160 /*
1161 * The caller says we don't want any filename completion cmds.
1162 * Reject them.
1163 */
1164 switch (action)
1165 {
1166 case EC_F_COMPLETE:
1167 case EC_B_COMPLETE:
1168 case EC_EXPAND:
1169 action = A_INVALID;
1170 break;
1171 }
1172 }
1173 #endif
1174 if ((flags & ECF_PEEK) || action == A_INVALID)
1175 {
1176 /*
1177 * We're just peeking, or we didn't understand the command.
1178 * Unget all the characters we read in the loop above.
1179 * This does NOT include the original character that was
1180 * passed in as a parameter.
1181 */
1182 while (nch > 1)
1183 {
1184 ungetcc(usercmd[--nch]);
1185 }
1186 } else
1187 {
1188 if (s != NULL)
1189 ungetsc(s);
1190 }
1191 return action;
1192 }
1193
1194