1 /*
2 * Copyright (C) 1984-2026 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 extern char *no_config;
40
41 static constant lbool allow_drag = TRUE;
42
43 #if USERFILE
44 /* "content" is lesskey source, never binary. */
45 static void add_content_table(int (*call_lesskey)(constant char *, lbool), constant char *envname, lbool sysvar);
46 static int add_hometable(int (*call_lesskey)(constant char *, lbool), constant char *envname, constant char *def_filename, lbool sysvar);
47 #endif /* USERFILE */
48
49 #define SK(k) \
50 SK_SPECIAL_KEY, (k), 6, 1, 1, 1
51 /*
52 * Command table is ordered roughly according to expected
53 * frequency of use, so the common commands are near the beginning.
54 */
55
56 static unsigned char cmdtable[] =
57 {
58 '\r',0, A_F_LINE,
59 '\n',0, A_F_LINE,
60 'e',0, A_F_LINE,
61 'j',0, A_F_LINE,
62 SK(SK_DOWN_ARROW),0, A_F_LINE,
63 CONTROL('E'),0, A_F_LINE,
64 CONTROL('N'),0, A_F_LINE,
65 'k',0, A_B_LINE,
66 'y',0, A_B_LINE,
67 CONTROL('Y'),0, A_B_LINE,
68 SK(SK_CONTROL_K),0, A_B_LINE,
69 CONTROL('P'),0, A_B_LINE,
70 SK(SK_UP_ARROW),0, A_B_LINE,
71 'J',0, A_FF_LINE,
72 'K',0, A_BF_LINE,
73 'Y',0, A_BF_LINE,
74 'd',0, A_F_SCROLL,
75 CONTROL('D'),0, A_F_SCROLL,
76 'u',0, A_B_SCROLL,
77 CONTROL('U'),0, A_B_SCROLL,
78 ESC,'[','M',0, A_X11MOUSE_IN,
79 ESC,'[','<',0, A_X116MOUSE_IN,
80 ' ',0, A_F_SCREEN,
81 'f',0, A_F_SCREEN,
82 CONTROL('F'),0, A_F_SCREEN,
83 CONTROL('V'),0, A_F_SCREEN,
84 SK(SK_PAGE_DOWN),0, A_F_SCREEN,
85 'b',0, A_B_SCREEN,
86 CONTROL('B'),0, A_B_SCREEN,
87 ESC,'v',0, A_B_SCREEN,
88 SK(SK_PAGE_UP),0, A_B_SCREEN,
89 'z',0, A_F_WINDOW,
90 'w',0, A_B_WINDOW,
91 ESC,' ',0, A_FF_SCREEN,
92 ESC,'b',0, A_BF_SCREEN,
93 ESC,'j',0, A_F_NEWLINE,
94 ESC,'k',0, A_B_NEWLINE,
95 'F',0, A_F_FOREVER,
96 ESC,'f',0, A_F_FOREVER_BELL,
97 ESC,'F',0, A_F_UNTIL_HILITE,
98 'R',0, A_FREPAINT,
99 'r',0, A_REPAINT,
100 CONTROL('R'),0, A_REPAINT,
101 CONTROL('L'),0, A_REPAINT,
102 ESC,'u',0, A_UNDO_SEARCH,
103 ESC,'U',0, A_CLR_SEARCH,
104 'g',0, A_GOLINE,
105 SK(SK_HOME),0, A_GOLINE,
106 SK(SK_SHIFT_HOME),0, A_GOLINE|A_EXTRA, ESC,'{',0,
107 SK(SK_CTL_HOME),0, A_GOLINE|A_EXTRA, ESC,'{',0,
108 SK(SK_END),0, A_GOEND,
109 SK(SK_SHIFT_END),0, A_GOEND|A_EXTRA, ESC,'}',0,
110 SK(SK_CTL_END),0, A_GOEND|A_EXTRA, ESC,'}',0,
111 '<',0, A_GOLINE,
112 ESC,'<',0, A_GOLINE,
113 'p',0, A_PERCENT,
114 '%',0, A_PERCENT,
115 ESC,'(',0, A_LSHIFT,
116 ESC,')',0, A_RSHIFT,
117 ESC,'{',0, A_LLSHIFT,
118 ESC,'}',0, A_RRSHIFT,
119 SK(SK_RIGHT_ARROW),0, A_RSHIFT,
120 SK(SK_LEFT_ARROW),0, A_LSHIFT,
121 SK(SK_CTL_RIGHT_ARROW),0, A_RRSHIFT,
122 SK(SK_CTL_LEFT_ARROW),0, A_LLSHIFT,
123 SK(SK_SHIFT_RIGHT_ARROW),0, A_RRSHIFT,
124 SK(SK_SHIFT_LEFT_ARROW),0, A_LLSHIFT,
125 '{',0, A_F_BRACKET|A_EXTRA, '{','}',0,
126 '}',0, A_B_BRACKET|A_EXTRA, '{','}',0,
127 '(',0, A_F_BRACKET|A_EXTRA, '(',')',0,
128 ')',0, A_B_BRACKET|A_EXTRA, '(',')',0,
129 '[',0, A_F_BRACKET|A_EXTRA, '[',']',0,
130 ']',0, A_B_BRACKET|A_EXTRA, '[',']',0,
131 ESC,CONTROL('F'),0, A_F_BRACKET,
132 ESC,CONTROL('B'),0, A_B_BRACKET,
133 'G',0, A_GOEND,
134 ESC,'G',0, A_GOEND_BUF,
135 ESC,'>',0, A_GOEND,
136 '>',0, A_GOEND,
137 'P',0, A_GOPOS,
138
139 '0',0, A_DIGIT,
140 '1',0, A_DIGIT,
141 '2',0, A_DIGIT,
142 '3',0, A_DIGIT,
143 '4',0, A_DIGIT,
144 '5',0, A_DIGIT,
145 '6',0, A_DIGIT,
146 '7',0, A_DIGIT,
147 '8',0, A_DIGIT,
148 '9',0, A_DIGIT,
149 '.',0, A_DIGIT,
150
151 '=',0, A_STAT,
152 CONTROL('G'),0, A_STAT,
153 ':','f',0, A_STAT,
154 '/',0, A_F_SEARCH,
155 '?',0, A_B_SEARCH,
156 ESC,'/',0, A_F_SEARCH|A_EXTRA, '*',0,
157 ESC,'?',0, A_B_SEARCH|A_EXTRA, '*',0,
158 'n',0, A_AGAIN_SEARCH,
159 ESC,'n',0, A_T_AGAIN_SEARCH,
160 'N',0, A_REVERSE_SEARCH,
161 ESC,'N',0, A_T_REVERSE_SEARCH,
162 '&',0, A_FILTER,
163 'm',0, A_SETMARK,
164 'M',0, A_SETMARKBOT,
165 ESC,'m',0, A_CLRMARK,
166 '\'',0, A_GOMARK,
167 CONTROL('X'),CONTROL('X'),0, A_GOMARK,
168 'E',0, A_EXAMINE,
169 ':','e',0, A_EXAMINE,
170 CONTROL('X'),CONTROL('V'),0, A_EXAMINE,
171 ':','n',0, A_NEXT_FILE,
172 ':','p',0, A_PREV_FILE,
173 CONTROL('O'),CONTROL('N'),0, A_OSC8_F_SEARCH,
174 CONTROL('O'),'n',0, A_OSC8_F_SEARCH,
175 CONTROL('O'),CONTROL('P'),0, A_OSC8_B_SEARCH,
176 CONTROL('O'),'p',0, A_OSC8_B_SEARCH,
177 CONTROL('O'),CONTROL('O'),0, A_OSC8_OPEN,
178 CONTROL('O'),'o',0, A_OSC8_OPEN,
179 CONTROL('O'),CONTROL('L'),0, A_OSC8_JUMP,
180 CONTROL('O'),'l',0, A_OSC8_JUMP,
181 't',0, A_NEXT_TAG,
182 'T',0, A_PREV_TAG,
183 ':','x',0, A_INDEX_FILE,
184 ':','d',0, A_REMOVE_FILE,
185 '-',0, A_OPT_TOGGLE,
186 ':','t',0, A_OPT_TOGGLE|A_EXTRA, 't',0,
187 's',0, A_OPT_TOGGLE|A_EXTRA, 'o',0,
188 '_',0, A_DISP_OPTION,
189 '|',0, A_PIPE,
190 'v',0, A_VISUAL,
191 '!',0, A_SHELL,
192 '#',0, A_PSHELL,
193 '+',0, A_FIRSTCMD,
194
195 SK(SK_PAD_U),0, A_B_LINE,
196 SK(SK_PAD_D),0, A_F_LINE,
197 SK(SK_PAD_R),0, A_RSHIFT,
198 SK(SK_PAD_L),0, A_LSHIFT,
199 SK(SK_PAD_UR),0, A_B_SCREEN,
200 SK(SK_PAD_UL),0, A_GOLINE,
201 SK(SK_PAD_DR),0, A_F_SCREEN,
202 SK(SK_PAD_DL),0, A_GOEND,
203 SK(SK_PAD_STAR),0, A_NOACTION|A_EXTRA, '*',0,
204 SK(SK_PAD_SLASH),0, A_NOACTION|A_EXTRA, '/',0,
205 SK(SK_PAD_DASH),0, A_NOACTION|A_EXTRA, '-',0,
206 SK(SK_PAD_PLUS),0, A_NOACTION|A_EXTRA, '+',0,
207 SK(SK_PAD_DOT),0, A_NOACTION|A_EXTRA, '.',0,
208 SK(SK_PAD_COMMA),0, A_NOACTION,
209 SK(SK_PAD_ZERO),0, A_NOACTION|A_EXTRA, '0',0,
210 SK(SK_PAD_CENTER),0, A_NOACTION,
211
212 ESC,'[','2','0','0','~',0, A_START_PASTE,
213 ESC,'[','2','0','1','~',0, A_END_PASTE,
214
215 'H',0, A_HELP,
216 'h',0, A_HELP,
217 SK(SK_F1),0, A_HELP,
218 'V',0, A_VERSION,
219 'q',0, A_QUIT,
220 'Q',0, A_QUIT,
221 ':','q',0, A_QUIT,
222 ':','Q',0, A_QUIT,
223 'Z','Z',0, A_QUIT
224 };
225
226 static unsigned char edittable[] =
227 {
228 '\t',0, EC_F_COMPLETE, /* TAB */
229 '\17',0, EC_B_COMPLETE, /* BACKTAB */
230 SK(SK_BACKTAB),0, EC_B_COMPLETE, /* BACKTAB */
231 ESC,'\t',0, EC_B_COMPLETE, /* ESC TAB */
232 CONTROL('L'),0, EC_EXPAND, /* CTRL-L */
233 CONTROL('V'),0, EC_LITERAL, /* BACKSLASH */
234 CONTROL('A'),0, EC_LITERAL, /* BACKSLASH */
235 ESC,'l',0, EC_RIGHT, /* ESC l */
236 SK(SK_RIGHT_ARROW),0, EC_RIGHT, /* RIGHTARROW */
237 ESC,'h',0, EC_LEFT, /* ESC h */
238 SK(SK_LEFT_ARROW),0, EC_LEFT, /* LEFTARROW */
239 ESC,'b',0, EC_W_LEFT, /* ESC b */
240 ESC,SK(SK_LEFT_ARROW),0, EC_W_LEFT, /* ESC LEFTARROW */
241 SK(SK_CTL_LEFT_ARROW),0, EC_W_LEFT, /* CTRL-LEFTARROW */
242 ESC,'w',0, EC_W_RIGHT, /* ESC w */
243 ESC,SK(SK_RIGHT_ARROW),0, EC_W_RIGHT, /* ESC RIGHTARROW */
244 SK(SK_CTL_RIGHT_ARROW),0, EC_W_RIGHT, /* CTRL-RIGHTARROW */
245 ESC,'i',0, EC_INSERT, /* ESC i */
246 SK(SK_INSERT),0, EC_INSERT, /* INSERT */
247 ESC,'x',0, EC_DELETE, /* ESC x */
248 SK(SK_DELETE),0, EC_DELETE, /* DELETE */
249 ESC,'X',0, EC_W_DELETE, /* ESC X */
250 ESC,SK(SK_DELETE),0, EC_W_DELETE, /* ESC DELETE */
251 SK(SK_CTL_DELETE),0, EC_W_DELETE, /* CTRL-DELETE */
252 SK(SK_CTL_BACKSPACE),0, EC_W_BACKSPACE, /* CTRL-BACKSPACE */
253 ESC,SK(SK_BACKSPACE),0, EC_W_BACKSPACE, /* ESC BACKSPACE */
254 ESC,'0',0, EC_HOME, /* ESC 0 */
255 SK(SK_HOME),0, EC_HOME, /* HOME */
256 SK(SK_SHIFT_HOME),0, EC_HOME, /* SHIFT-HOME */
257 SK(SK_CTL_HOME),0, EC_HOME, /* CTRL-HOME */
258 ESC,'$',0, EC_END, /* ESC $ */
259 SK(SK_END),0, EC_END, /* END */
260 SK(SK_SHIFT_END),0, EC_END, /* SHIFT-END */
261 SK(SK_CTL_END),0, EC_END, /* CTRL-END */
262 ESC,'k',0, EC_UP, /* ESC k */
263 SK(SK_UP_ARROW),0, EC_UP, /* UPARROW */
264 ESC,'j',0, EC_DOWN, /* ESC j */
265 SK(SK_DOWN_ARROW),0, EC_DOWN, /* DOWNARROW */
266 CONTROL('G'),0, EC_ABORT, /* CTRL-G */
267 SK(SK_PAD_U),0, EC_UP,
268 SK(SK_PAD_D),0, EC_DOWN,
269 SK(SK_PAD_R),0, EC_RIGHT,
270 SK(SK_PAD_L),0, EC_LEFT,
271 SK(SK_PAD_UR),0, A_NOACTION,
272 SK(SK_PAD_UL),0, EC_HOME,
273 SK(SK_PAD_DR),0, A_NOACTION,
274 SK(SK_PAD_DL),0, EC_END,
275 SK(SK_PAD_STAR),0, A_NOACTION|A_EXTRA, '*',0,
276 SK(SK_PAD_SLASH),0, A_NOACTION|A_EXTRA, '/',0,
277 SK(SK_PAD_DASH),0, A_NOACTION|A_EXTRA, '-',0,
278 SK(SK_PAD_PLUS),0, A_NOACTION|A_EXTRA, '+',0,
279 SK(SK_PAD_DOT),0, A_NOACTION|A_EXTRA, '.',0,
280 SK(SK_PAD_COMMA),0, A_NOACTION|A_EXTRA, ',',0,
281 SK(SK_PAD_ZERO),0, A_NOACTION|A_EXTRA, '0',0,
282 SK(SK_PAD_CENTER),0, A_NOACTION,
283 ESC,'[','M',0, EC_X11MOUSE, /* X11 mouse report */
284 ESC,'[','<',0, EC_X116MOUSE, /* X11 1006 mouse report */
285 ESC,'[','2','0','0','~',0, A_START_PASTE, /* open paste bracket */
286 ESC,'[','2','0','1','~',0, A_END_PASTE, /* close paste bracket */
287 };
288
289 static unsigned char dflt_vartable[] =
290 {
291 'L','E','S','S','_','O','S','C','8','_','m','a','n', 0, EV_OK|A_EXTRA,
292 /* echo '%o' | sed -e "s,^man\:\\([^(]*\\)( *\\([^)]*\\)\.*,-man '\\2' '\\1'," -e"t X" -e"s,\.*,-echo Invalid man link," -e"\: X" */
293 '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','"',
294 0,
295
296 'L','E','S','S','_','O','S','C','8','_','f','i','l','e', 0, EV_OK|A_EXTRA,
297 /* 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 */
298 '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',
299 0,
300 };
301
302 /*
303 * Structure to support a list of command tables.
304 */
305 struct tablelist
306 {
307 struct tablelist *t_next;
308 unsigned char *t_start;
309 unsigned char *t_end;
310 };
311
312 /*
313 * List of command tables and list of line-edit tables.
314 */
315 static struct tablelist *list_fcmd_tables = NULL;
316 static struct tablelist *list_ecmd_tables = NULL;
317 static struct tablelist *list_var_tables = NULL;
318 static struct tablelist *list_sysvar_tables = NULL;
319
320
321 /*
322 * Expand special key abbreviations in a command table.
323 */
expand_special_keys(unsigned char * table,size_t len)324 static void expand_special_keys(unsigned char *table, size_t len)
325 {
326 unsigned char *fm;
327 unsigned char *to;
328 int a;
329 constant char *repl;
330 size_t klen;
331
332 for (fm = table; fm < table + len; )
333 {
334 /*
335 * Rewrite each command in the table with any
336 * special key abbreviations expanded.
337 */
338 for (to = fm; *fm != '\0'; )
339 {
340 if (*fm != SK_SPECIAL_KEY)
341 {
342 *to++ = *fm++;
343 continue;
344 }
345 /*
346 * After SK_SPECIAL_KEY, next byte is the type
347 * of special key (one of the SK_* constants),
348 * and the byte after that is the number of bytes,
349 * N, reserved by the abbreviation (including the
350 * SK_SPECIAL_KEY and key type bytes).
351 * Replace all N bytes with the actual bytes
352 * output by the special key on this terminal.
353 */
354 repl = special_key_str(fm[1]);
355 klen = fm[2] & 0377;
356 fm += klen;
357 if (repl == NULL || strlen(repl) > klen)
358 repl = "\377";
359 while (*repl != '\0')
360 *to++ = (unsigned char) *repl++; /*{{type-issue}}*/
361 }
362 *to++ = '\0';
363 /*
364 * Fill any unused bytes between end of command and
365 * the action byte with A_SKIP.
366 */
367 while (to <= fm)
368 *to++ = A_SKIP;
369 fm++;
370 a = *fm++ & 0377;
371 if (a & A_EXTRA)
372 {
373 while (*fm++ != '\0')
374 continue;
375 }
376 }
377 }
378
379 /*
380 * Expand special key abbreviations in a list of command tables.
381 */
expand_cmd_table(struct tablelist * tlist)382 static void expand_cmd_table(struct tablelist *tlist)
383 {
384 struct tablelist *t;
385 for (t = tlist; t != NULL; t = t->t_next)
386 {
387 expand_special_keys(t->t_start, ptr_diff(t->t_end, t->t_start));
388 }
389 }
390
391 /*
392 * Expand special key abbreviations in all command tables.
393 */
expand_cmd_tables(void)394 public void expand_cmd_tables(void)
395 {
396 expand_cmd_table(list_fcmd_tables);
397 expand_cmd_table(list_ecmd_tables);
398 expand_cmd_table(list_var_tables);
399 expand_cmd_table(list_sysvar_tables);
400 }
401
402 /*
403 * Initialize the command lists.
404 */
init_cmds(void)405 public void init_cmds(void)
406 {
407 /*
408 * Add the default command tables.
409 */
410 add_fcmd_table(cmdtable, sizeof(cmdtable));
411 add_ecmd_table(edittable, sizeof(edittable));
412 add_sysvar_table(dflt_vartable, sizeof(dflt_vartable));
413 #if USERFILE
414 #ifdef BINDIR /* For backwards compatibility */
415 /* Try to add tables in the OLD system lesskey file. */
416 add_hometable(lesskey, NULL, BINDIR "/.sysless", TRUE);
417 #endif
418 /*
419 * Try to load lesskey source file or binary file.
420 * If the source file succeeds, don't load binary file.
421 * The binary file is likely to have been generated from
422 * a (possibly out of date) copy of the src file,
423 * so loading it is at best redundant.
424 */
425 /*
426 * Try to add tables in system lesskey src file.
427 */
428 #if HAVE_LESSKEYSRC
429 if (add_hometable(lesskey_src, "LESSKEYIN_SYSTEM", LESSKEYINFILE_SYS, TRUE) != 0)
430 #endif
431 {
432 /*
433 * Try to add the tables in the system lesskey binary file.
434 */
435 add_hometable(lesskey, "LESSKEY_SYSTEM", LESSKEYFILE_SYS, TRUE);
436 }
437 /*
438 * Try to add tables in the lesskey src file "$HOME/.lesskey".
439 */
440 #if HAVE_LESSKEYSRC
441 if (add_hometable(lesskey_src, "LESSKEYIN", DEF_LESSKEYINFILE, FALSE) != 0)
442 #endif
443 {
444 /*
445 * Try to add the tables in the standard lesskey binary file "$HOME/.less".
446 */
447 add_hometable(lesskey, "LESSKEY", LESSKEYFILE, FALSE);
448 }
449
450 add_content_table(lesskey_content, "LESSKEY_CONTENT_SYSTEM", TRUE);
451 add_content_table(lesskey_content, "LESSKEY_CONTENT", FALSE);
452 #endif /* USERFILE */
453 }
454
455 /*
456 * Add a command table.
457 */
add_cmd_table(struct tablelist ** tlist,unsigned char * buf,size_t len)458 static int add_cmd_table(struct tablelist **tlist, unsigned char *buf, size_t len)
459 {
460 struct tablelist *t;
461
462 if (len == 0)
463 return (0);
464 /*
465 * Allocate a tablelist structure, initialize it,
466 * and link it into the list of tables.
467 */
468 if ((t = (struct tablelist *)
469 calloc(1, sizeof(struct tablelist))) == NULL)
470 {
471 return (-1);
472 }
473 t->t_start = buf;
474 t->t_end = buf + len;
475 t->t_next = NULL;
476 if (*tlist == NULL)
477 *tlist = t;
478 else
479 {
480 struct tablelist *e;
481 for (e = *tlist; e->t_next != NULL; e = e->t_next)
482 continue;
483 e->t_next = t;
484 }
485 return (0);
486 }
487
488 /*
489 * Remove the last command table in a list.
490 */
pop_cmd_table(struct tablelist ** tlist)491 static void pop_cmd_table(struct tablelist **tlist)
492 {
493 struct tablelist *t;
494 if (*tlist == NULL)
495 return;
496 if ((*tlist)->t_next == NULL)
497 {
498 t = *tlist;
499 *tlist = NULL;
500 } else
501 {
502 struct tablelist *e;
503 for (e = *tlist; e->t_next->t_next != NULL; e = e->t_next)
504 continue;
505 t = e->t_next;
506 e->t_next = NULL;
507 }
508 free(t);
509 }
510
511 /*
512 * Add a command table.
513 */
add_fcmd_table(unsigned char * buf,size_t len)514 public void add_fcmd_table(unsigned char *buf, size_t len)
515 {
516 if (add_cmd_table(&list_fcmd_tables, buf, len) < 0)
517 error("Warning: some commands disabled", NULL_PARG);
518 }
519
520 /*
521 * Add an editing command table.
522 */
add_ecmd_table(unsigned char * buf,size_t len)523 public void add_ecmd_table(unsigned char *buf, size_t len)
524 {
525 if (add_cmd_table(&list_ecmd_tables, buf, len) < 0)
526 error("Warning: some edit commands disabled", NULL_PARG);
527 }
528
529 /*
530 * Add an environment variable table.
531 */
add_var_table(struct tablelist ** tlist,mutable unsigned char * buf,size_t len)532 static void add_var_table(struct tablelist **tlist, mutable unsigned char *buf, size_t len)
533 {
534 struct xbuffer xbuf;
535
536 xbuf_init(&xbuf);
537 expand_evars((mutable char*)buf, len, &xbuf); /*{{unsigned-issue}}*/
538 /* {{ We leak the table in buf. expand_evars scribbled in it so it's useless anyway. }} */
539 if (add_cmd_table(tlist, xbuf.data, xbuf.end) < 0)
540 error("Warning: environment variables from lesskey file unavailable", NULL_PARG);
541 }
542
add_uvar_table(unsigned char * buf,size_t len)543 public void add_uvar_table(unsigned char *buf, size_t len)
544 {
545 add_var_table(&list_var_tables, buf, len);
546 }
547
add_sysvar_table(unsigned char * buf,size_t len)548 public void add_sysvar_table(unsigned char *buf, size_t len)
549 {
550 add_var_table(&list_sysvar_tables, buf, len);
551 }
552
553 /*
554 * Return action for a mouse wheel down event.
555 */
mouse_wheel_down(void)556 static int mouse_wheel_down(void)
557 {
558 return ((mousecap == OPT_ONPLUS) ? A_B_MOUSE : A_F_MOUSE);
559 }
560
561 /*
562 * Return action for a mouse wheel up event.
563 */
mouse_wheel_up(void)564 static int mouse_wheel_up(void)
565 {
566 return ((mousecap == OPT_ONPLUS) ? A_F_MOUSE : A_B_MOUSE);
567 }
568
569 /*
570 * Return action for the left mouse button trigger.
571 */
mouse_button_left(int x,int y,lbool down,lbool drag)572 static int mouse_button_left(int x, int y, lbool down, lbool drag)
573 {
574 static int last_drag_y = -1;
575 static int last_click_y = -1;
576
577 if (down && !drag)
578 {
579 last_drag_y = last_click_y = y;
580 }
581 if (allow_drag && drag && last_drag_y >= 0)
582 {
583 /* Drag text up/down */
584 if (y > last_drag_y)
585 {
586 cmd_exec();
587 backward(y - last_drag_y, FALSE, FALSE, FALSE);
588 last_drag_y = y;
589 } else if (y < last_drag_y)
590 {
591 cmd_exec();
592 forward(last_drag_y - y, FALSE, FALSE, FALSE);
593 last_drag_y = y;
594 }
595 } else if (!down)
596 {
597 #if OSC8_LINK
598 if (secure_allow(SF_OSC8_OPEN))
599 {
600 if (osc8_click(y, x))
601 return (A_NOACTION);
602 }
603 #else
604 (void) x;
605 #endif /* OSC8_LINK */
606 if (y < sc_height-1 && y == last_click_y)
607 {
608 setmark('#', y);
609 screen_trashed();
610 }
611 }
612 return (A_NOACTION);
613 }
614
615 /*
616 * Return action for the right mouse button trigger.
617 */
mouse_button_right(int x,int y,lbool down,lbool drag)618 static int mouse_button_right(int x, int y, lbool down, lbool drag)
619 {
620 (void) x; (void) drag;
621 /*
622 * {{ unlike mouse_button_left, we could return an action,
623 * but keep it near mouse_button_left for readability. }}
624 */
625 if (!down && y < sc_height-1)
626 {
627 gomark('#');
628 screen_trashed();
629 }
630 return (A_NOACTION);
631 }
632
633 /*
634 * Read a decimal integer. Return the integer and set *pterm to the terminating char.
635 */
getcc_int(char * pterm)636 static int getcc_int(char *pterm)
637 {
638 int num = 0;
639 int digits = 0;
640 for (;;)
641 {
642 char ch = getcc();
643 if (ch < '0' || ch > '9')
644 {
645 if (pterm != NULL) *pterm = ch;
646 if (digits == 0)
647 return (-1);
648 return (num);
649 }
650 if (ckd_mul(&num, num, 10) || ckd_add(&num, num, ch - '0'))
651 return -1;
652 ++digits;
653 }
654 }
655
x11mouse_button(int btn,int x,int y,lbool down,lbool drag)656 static int x11mouse_button(int btn, int x, int y, lbool down, lbool drag)
657 {
658 switch (btn) {
659 case X11MOUSE_BUTTON1:
660 return mouse_button_left(x, y, down, drag);
661 /* is BUTTON2 the rightmost with 2-buttons mouse? */
662 case X11MOUSE_BUTTON2:
663 case X11MOUSE_BUTTON3:
664 return mouse_button_right(x, y, down, drag);
665 }
666 return (A_NOACTION);
667 }
668
669 /*
670 * Read suffix of mouse input and return the action to take.
671 * The prefix ("\e[M") has already been read.
672 */
x11mouse_action(lbool skip)673 static int x11mouse_action(lbool skip)
674 {
675 static int prev_b = X11MOUSE_BUTTON_REL;
676 int x, y;
677 int b = getcc() - X11MOUSE_OFFSET;
678 lbool drag = ((b & X11MOUSE_DRAG) != 0);
679 b &= ~X11MOUSE_DRAG;
680 x = getcc() - X11MOUSE_OFFSET-1;
681 y = getcc() - X11MOUSE_OFFSET-1;
682 if (skip)
683 return (A_NOACTION);
684 switch (b) {
685 case X11MOUSE_WHEEL_DOWN:
686 return mouse_wheel_down();
687 case X11MOUSE_WHEEL_UP:
688 return mouse_wheel_up();
689 case X11MOUSE_BUTTON1:
690 case X11MOUSE_BUTTON2:
691 case X11MOUSE_BUTTON3:
692 prev_b = b;
693 return x11mouse_button(b, x, y, TRUE, drag);
694 case X11MOUSE_BUTTON_REL: /* button up */
695 return x11mouse_button(prev_b, x, y, FALSE, drag);
696 }
697 return (A_NOACTION);
698 }
699
700 /*
701 * Read suffix of mouse input and return the action to take.
702 * The prefix ("\e[<") has already been read.
703 */
x116mouse_action(lbool skip)704 static int x116mouse_action(lbool skip)
705 {
706 char ch;
707 int x, y;
708 int b = getcc_int(&ch);
709 lbool drag = ((b & X11MOUSE_DRAG) != 0);
710 b &= ~X11MOUSE_DRAG;
711 if (b < 0 || ch != ';') return (A_NOACTION);
712 x = getcc_int(&ch) - 1;
713 if (x < 0 || ch != ';') return (A_NOACTION);
714 y = getcc_int(&ch) - 1;
715 if (y < 0) return (A_NOACTION);
716 if (skip)
717 return (A_NOACTION);
718 switch (b) {
719 case X11MOUSE_WHEEL_DOWN:
720 return mouse_wheel_down();
721 case X11MOUSE_WHEEL_UP:
722 return mouse_wheel_up();
723 case X11MOUSE_BUTTON1:
724 case X11MOUSE_BUTTON2:
725 case X11MOUSE_BUTTON3: {
726 lbool down = (ch == 'M');
727 lbool up = (ch == 'm');
728 if (up || down)
729 return x11mouse_button(b, x, y, down, drag);
730 break; }
731 }
732 return (A_NOACTION);
733 }
734
735 /*
736 * Return the largest N such that the first N chars of goal
737 * are equal to the last N chars of str.
738 */
cmd_match(constant char * goal,constant char * str)739 static size_t cmd_match(constant char *goal, constant char *str)
740 {
741 size_t slen = strlen(str);
742 size_t len;
743 for (len = slen; len > 0; len--)
744 if (strncmp(str + slen - len, goal, len) == 0)
745 break;
746 return len;
747 }
748
749 /*
750 * Return pointer to next command table entry.
751 * Also return the action and the extra string from the entry.
752 */
cmd_next_entry(constant unsigned char * entry,mutable int * action,mutable constant unsigned char ** extra,mutable size_t * cmdlen)753 static constant unsigned char * cmd_next_entry(constant unsigned char *entry, mutable int *action, mutable constant unsigned char **extra, mutable size_t *cmdlen)
754 {
755 int a;
756 constant unsigned char *oentry = entry;
757 while (*entry != '\0') /* skip cmd */
758 ++entry;
759 if (cmdlen != NULL)
760 *cmdlen = ptr_diff(entry, oentry);
761 do
762 a = *++entry; /* get action */
763 while (a == A_SKIP);
764 ++entry; /* skip action */
765 if (extra != NULL)
766 *extra = (a & A_EXTRA) ? entry : NULL;
767 if (a & A_EXTRA)
768 {
769 while (*entry++ != '\0') /* skip extra string */
770 continue;
771 a &= ~A_EXTRA;
772 }
773 if (action != NULL)
774 *action = a;
775 return entry;
776 }
777
778 /*
779 * Search a single command table for the command string in cmd.
780 */
cmd_search(constant char * cmd,constant unsigned char * table,constant unsigned char * endtable,constant unsigned char ** extra,size_t * mlen)781 static int cmd_search(constant char *cmd, constant unsigned char *table, constant unsigned char *endtable, constant unsigned char **extra, size_t *mlen)
782 {
783 int action = A_INVALID;
784 size_t match_len = 0;
785 if (extra != NULL)
786 *extra = NULL;
787 while (table < endtable)
788 {
789 int taction;
790 constant unsigned char *textra;
791 size_t cmdlen;
792 size_t match = cmd_match((constant char *) table, cmd);
793 table = cmd_next_entry(table, &taction, &textra, &cmdlen);
794 if (taction == A_END_LIST)
795 return (-action);
796 if (match >= match_len)
797 {
798 if (match == cmdlen) /* (last chars of) cmd matches this table entry */
799 {
800 action = taction;
801 if (extra != NULL)
802 *extra = textra;
803 } else if (match > 0 && action == A_INVALID) /* cmd is a prefix of this table entry */
804 {
805 action = A_PREFIX;
806 }
807 match_len = match;
808 }
809 }
810 if (mlen != NULL)
811 *mlen = match_len;
812 return (action);
813 }
814
815 /*
816 * Decode a command character and return the associated action.
817 * The "extra" string, if any, is returned in sp.
818 */
cmd_decode(struct tablelist * tlist,constant char * cmd,constant char ** sp)819 static int cmd_decode(struct tablelist *tlist, constant char *cmd, constant char **sp)
820 {
821 struct tablelist *t;
822 int action = A_INVALID;
823 size_t match_len = 0;
824
825 /*
826 * Search for the cmd thru all the command tables.
827 * If we find it more than once, take the last one.
828 */
829 *sp = NULL;
830 for (t = tlist; t != NULL; t = t->t_next)
831 {
832 constant unsigned char *tsp;
833 size_t mlen = match_len;
834 int taction = cmd_search(cmd, t->t_start, t->t_end, &tsp, &mlen);
835 if (mlen >= match_len)
836 {
837 match_len = mlen;
838 if (taction != A_INVALID)
839 {
840 *sp = (constant char *) tsp;
841 if (taction < 0)
842 {
843 action = -taction;
844 break;
845 }
846 action = taction;
847 }
848 }
849 }
850 if (action == A_X11MOUSE_IN)
851 action = x11mouse_action(FALSE);
852 else if (action == A_X116MOUSE_IN)
853 action = x116mouse_action(FALSE);
854 return (action);
855 }
856
857 /*
858 * Decode a command from the cmdtables list.
859 */
fcmd_decode(constant char * cmd,constant char ** sp)860 public int fcmd_decode(constant char *cmd, constant char **sp)
861 {
862 return (cmd_decode(list_fcmd_tables, cmd, sp));
863 }
864
865 /*
866 * Decode a command from the edittables list.
867 */
ecmd_decode(constant char * cmd,constant char ** sp)868 public int ecmd_decode(constant char *cmd, constant char **sp)
869 {
870 return (cmd_decode(list_ecmd_tables, cmd, sp));
871 }
872
873 /*
874 * Parse a comma-separated list.
875 * Call func repeatedly, passing each item in the list.
876 * Stop and return FALSE if func ever returns FALSE,
877 * otherwise parse the entire list and return TRUE.
878 */
parse_csl(lbool (* func)(constant char * word,size_t wlen,void * arg),constant char * str,void * arg)879 public lbool parse_csl(lbool (*func)(constant char *word, size_t wlen, void *arg), constant char *str, void *arg)
880 {
881 for (;;)
882 {
883 constant char *estr;
884 while (*str == ' ' || *str == ',') ++str; /* skip leading spaces/commas */
885 if (*str == '\0') break;
886 estr = strchr(str, ',');
887 if (estr == NULL) estr = str + strlen(str);
888 while (estr > str && estr[-1] == ' ') --estr; /* trim trailing spaces */
889 if (!(*func)(str, ptr_diff(estr, str), arg))
890 return FALSE;
891 str = estr;
892 }
893 return TRUE;
894 }
895
896 /*
897 * Should we ignore the setting of an environment variable?
898 */
word_no_match(constant char * word,size_t wlen,void * arg)899 static lbool word_no_match(constant char *word, size_t wlen, void *arg)
900 {
901 constant char *var = (constant char *) arg;
902 return !(wlen == strlen(var) && strncmp(var, word, wlen) == 0);
903 }
ignore_env(constant char * var)904 static lbool ignore_env(constant char *var)
905 {
906 if (isnullenv(no_config))
907 return FALSE; /* no_config is not set; don't ignore anything */
908 /* no_config is set; ignore any var that does not appear in no_config */
909 return parse_csl(word_no_match, no_config, (void*) var);
910 }
911
912 /*
913 * Get the value of an environment variable.
914 * Looks first in the lesskey file, then in the real environment.
915 */
lgetenv(constant char * var)916 public constant char * lgetenv(constant char *var)
917 {
918 int a;
919 constant char *s;
920
921 if (ignore_env(var))
922 return (NULL);
923 a = cmd_decode(list_var_tables, var, &s);
924 if (a == EV_OK)
925 return (s);
926 s = getenv(var);
927 if (s != NULL && *s != '\0')
928 return (s);
929 a = cmd_decode(list_sysvar_tables, var, &s);
930 if (a == EV_OK)
931 return (s);
932 return (NULL);
933 }
934
935 /*
936 * Like lgetenv, but also uses a buffer partially filled with an env table.
937 */
lgetenv_ext(constant char * var,unsigned char * env_buf,size_t env_buf_len)938 public constant char * lgetenv_ext(constant char *var, unsigned char *env_buf, size_t env_buf_len)
939 {
940 constant char *r;
941 size_t e;
942 size_t env_end = 0;
943
944 for (e = 0;;)
945 {
946 for (; e < env_buf_len; e++)
947 if (env_buf[e] == '\0')
948 break;
949 if (e >= env_buf_len) break;
950 if (env_buf[++e] & A_EXTRA)
951 {
952 for (e = e+1; e < env_buf_len; e++)
953 if (env_buf[e] == '\0')
954 break;
955 }
956 e++;
957 if (e >= env_buf_len) break;
958 env_end = e;
959 }
960 /* Temporarily add env_buf to var_tables, do the lookup, then remove it. */
961 add_uvar_table(env_buf, env_end);
962 r = lgetenv(var);
963 pop_cmd_table(&list_var_tables);
964 return r;
965 }
966
967 /*
968 * Is a string null or empty?
969 */
isnullenv(constant char * s)970 public lbool isnullenv(constant char *s)
971 {
972 return (s == NULL || *s == '\0');
973 }
974
975 #if USERFILE
976 /*
977 * Get an "integer" from a lesskey file.
978 * Integers are stored in a funny format:
979 * two bytes, low order first, in radix KRADIX.
980 */
gint(unsigned char ** sp)981 static size_t gint(unsigned char **sp)
982 {
983 size_t n;
984
985 n = *(*sp)++;
986 n += *(*sp)++ * KRADIX;
987 return (n);
988 }
989
990 /*
991 * Process an old (pre-v241) lesskey file.
992 */
old_lesskey(unsigned char * buf,size_t len)993 static int old_lesskey(unsigned char *buf, size_t len)
994 {
995 /*
996 * Old-style lesskey file.
997 * The file must end with either
998 * ...,cmd,0,action
999 * or ...,cmd,0,action|A_EXTRA,string,0
1000 * So the last byte or the second to last byte must be zero.
1001 */
1002 if (buf[len-1] != '\0' && buf[len-2] != '\0')
1003 return (-1);
1004 add_fcmd_table(buf, len);
1005 return (0);
1006 }
1007
1008 /*
1009 * Process a new (post-v241) lesskey file.
1010 */
new_lesskey(unsigned char * buf,size_t len,lbool sysvar)1011 static int new_lesskey(unsigned char *buf, size_t len, lbool sysvar)
1012 {
1013 unsigned char *p;
1014 unsigned char *end;
1015 int c;
1016 size_t n;
1017
1018 /*
1019 * New-style lesskey file.
1020 * Extract the pieces.
1021 */
1022 if (buf[len-3] != C0_END_LESSKEY_MAGIC ||
1023 buf[len-2] != C1_END_LESSKEY_MAGIC ||
1024 buf[len-1] != C2_END_LESSKEY_MAGIC)
1025 return (-1);
1026 p = buf + 4;
1027 end = buf + len;
1028 for (;;)
1029 {
1030 c = *p++;
1031 switch (c)
1032 {
1033 case CMD_SECTION:
1034 n = gint(&p);
1035 if (p+n >= end)
1036 return (-1);
1037 add_fcmd_table(p, n);
1038 p += n;
1039 break;
1040 case EDIT_SECTION:
1041 n = gint(&p);
1042 if (p+n >= end)
1043 return (-1);
1044 add_ecmd_table(p, n);
1045 p += n;
1046 break;
1047 case VAR_SECTION:
1048 n = gint(&p);
1049 if (p+n >= end)
1050 return (-1);
1051 if (sysvar)
1052 add_sysvar_table(p, n);
1053 else
1054 add_uvar_table(p, n);
1055 p += n;
1056 break;
1057 case END_SECTION:
1058 return (0);
1059 default:
1060 /*
1061 * Unrecognized section type.
1062 */
1063 return (-1);
1064 }
1065 }
1066 }
1067
1068 /*
1069 * Set up a user command table, based on a "lesskey" file.
1070 */
lesskey(constant char * filename,lbool sysvar)1071 public int lesskey(constant char *filename, lbool sysvar)
1072 {
1073 unsigned char *buf;
1074 POSITION len;
1075 ssize_t n;
1076 int f;
1077
1078 if (!secure_allow(SF_LESSKEY) || !isnullenv(no_config))
1079 return (1);
1080 /*
1081 * Try to open the lesskey file.
1082 */
1083 f = open(filename, OPEN_READ);
1084 if (f < 0)
1085 return (1);
1086
1087 /*
1088 * Read the file into a buffer.
1089 * We first figure out the size of the file and allocate space for it.
1090 * {{ Minimal error checking is done here.
1091 * A garbage .less file will produce strange results.
1092 * To avoid a large amount of error checking code here, we
1093 * rely on the lesskey program to generate a good .less file. }}
1094 */
1095 len = filesize(f);
1096 if (len == NULL_POSITION || len < 3)
1097 {
1098 /*
1099 * Bad file (valid file must have at least 3 chars).
1100 */
1101 close(f);
1102 return (-1);
1103 }
1104 if ((buf = (unsigned char *) calloc((size_t)len, sizeof(char))) == NULL)
1105 {
1106 close(f);
1107 return (-1);
1108 }
1109 if (less_lseek(f, (less_off_t)0, SEEK_SET) == BAD_LSEEK)
1110 {
1111 free(buf);
1112 close(f);
1113 return (-1);
1114 }
1115 n = read(f, buf, (size_t) len);
1116 close(f);
1117 if (n != len)
1118 {
1119 free(buf);
1120 return (-1);
1121 }
1122
1123 /*
1124 * Figure out if this is an old-style (before version 241)
1125 * or new-style lesskey file format.
1126 */
1127 if (len < 4 ||
1128 buf[0] != C0_LESSKEY_MAGIC || buf[1] != C1_LESSKEY_MAGIC ||
1129 buf[2] != C2_LESSKEY_MAGIC || buf[3] != C3_LESSKEY_MAGIC)
1130 return (old_lesskey(buf, (size_t) len));
1131 return (new_lesskey(buf, (size_t) len, sysvar));
1132 }
1133
1134 #if HAVE_LESSKEYSRC
lesskey_text(constant char * filename,lbool sysvar,lbool content)1135 static int lesskey_text(constant char *filename, lbool sysvar, lbool content)
1136 {
1137 int r;
1138 static struct lesskey_tables tables;
1139
1140 if (!secure_allow(SF_LESSKEY) || !isnullenv(no_config))
1141 return (1);
1142 r = content ? parse_lesskey_content(filename, &tables) : parse_lesskey(filename, &tables);
1143 if (r != 0)
1144 return (r);
1145 add_fcmd_table(tables.cmdtable.buf.data, tables.cmdtable.buf.end);
1146 add_ecmd_table(tables.edittable.buf.data, tables.edittable.buf.end);
1147 if (sysvar)
1148 add_sysvar_table(tables.vartable.buf.data, tables.vartable.buf.end);
1149 else
1150 add_uvar_table(tables.vartable.buf.data, tables.vartable.buf.end);
1151 return (0);
1152 }
1153
lesskey_src(constant char * filename,lbool sysvar)1154 public int lesskey_src(constant char *filename, lbool sysvar)
1155 {
1156 return lesskey_text(filename, sysvar, FALSE);
1157 }
1158
lesskey_content(constant char * content,lbool sysvar)1159 public int lesskey_content(constant char *content, lbool sysvar)
1160 {
1161 return lesskey_text(content, sysvar, TRUE);
1162 }
1163
lesskey_parse_error(char * s)1164 void lesskey_parse_error(char *s)
1165 {
1166 PARG parg;
1167 parg.p_string = s;
1168 error("%s", &parg);
1169 }
1170 #endif /* HAVE_LESSKEYSRC */
1171
1172 /*
1173 * Add a lesskey file.
1174 */
add_hometable(int (* call_lesskey)(constant char *,lbool),constant char * envname,constant char * def_filename,lbool sysvar)1175 static int add_hometable(int (*call_lesskey)(constant char *, lbool), constant char *envname, constant char *def_filename, lbool sysvar)
1176 {
1177 char *filename = NULL;
1178 constant char *efilename;
1179 int r;
1180
1181 #if LESSTEST
1182 if (is_lesstest()) /* Don't use lesskey files in lesstest */
1183 return -1;
1184 #endif
1185 if (envname != NULL && (efilename = lgetenv(envname)) != NULL)
1186 filename = save(efilename);
1187 else if (sysvar) /* def_filename is full path */
1188 filename = save(def_filename);
1189 else /* def_filename is just basename */
1190 {
1191 /* Remove first char (normally a dot) unless stored in $HOME. */
1192 constant char *xdg = lgetenv("XDG_CONFIG_HOME");
1193 if (!isnullenv(xdg))
1194 filename = dirfile(xdg, &def_filename[1], 1);
1195 if (filename == NULL)
1196 {
1197 constant char *home = lgetenv("HOME");
1198 if (!isnullenv(home))
1199 {
1200 char *cfg_dir = dirfile(home, ".config", 0);
1201 filename = dirfile(cfg_dir, &def_filename[1], 1);
1202 free(cfg_dir);
1203 }
1204 }
1205 if (filename == NULL)
1206 filename = homefile(def_filename);
1207 }
1208 if (filename == NULL)
1209 return -1;
1210 r = (*call_lesskey)(filename, sysvar);
1211 free(filename);
1212 return (r);
1213 }
1214
1215 /*
1216 * Add the content of a lesskey source file.
1217 */
add_content_table(int (* call_lesskey)(constant char *,lbool),constant char * envname,lbool sysvar)1218 static void add_content_table(int (*call_lesskey)(constant char *, lbool), constant char *envname, lbool sysvar)
1219 {
1220 constant char *content;
1221
1222 (void) call_lesskey; /* not used */
1223 content = lgetenv(envname);
1224 if (isnullenv(content))
1225 return;
1226 lesskey_content(content, sysvar);
1227 }
1228 #endif /* USERFILE */
1229
1230 /*
1231 * See if a char is a special line-editing command.
1232 */
editchar(char c,int flags)1233 public int editchar(char c, int flags)
1234 {
1235 int action;
1236 int nch;
1237 constant char *s;
1238 char usercmd[MAX_CMDLEN+1];
1239
1240 /*
1241 * An editing character could actually be a sequence of characters;
1242 * for example, an escape sequence sent by pressing the uparrow key.
1243 * To match the editing string, we use the command decoder
1244 * but give it the edit-commands command table
1245 * This table is constructed to match the user's keyboard.
1246 */
1247 if (c == erase_char || c == erase2_char)
1248 return (EC_BACKSPACE);
1249 if (c == kill_char)
1250 {
1251 #if MSDOS_COMPILER==WIN32C
1252 if (!win32_kbhit())
1253 #endif
1254 return (EC_LINEKILL);
1255 }
1256
1257 /*
1258 * Collect characters in a buffer.
1259 * Start with the one we have, and get more if we need them.
1260 */
1261 nch = 0;
1262 do {
1263 if (nch > 0)
1264 c = getcc();
1265 usercmd[nch] = c;
1266 usercmd[nch+1] = '\0';
1267 nch++;
1268 action = ecmd_decode(usercmd, &s);
1269 } while (action == A_PREFIX && nch < MAX_CMDLEN);
1270
1271 if (action == EC_X11MOUSE)
1272 return (x11mouse_action(TRUE));
1273 if (action == EC_X116MOUSE)
1274 return (x116mouse_action(TRUE));
1275
1276 if (flags & ECF_NORIGHTLEFT)
1277 {
1278 switch (action)
1279 {
1280 case EC_RIGHT:
1281 case EC_LEFT:
1282 action = A_INVALID;
1283 break;
1284 }
1285 }
1286 #if CMD_HISTORY
1287 if (flags & ECF_NOHISTORY)
1288 {
1289 /*
1290 * The caller says there is no history list.
1291 * Reject any history-manipulation action.
1292 */
1293 switch (action)
1294 {
1295 case EC_UP:
1296 case EC_DOWN:
1297 action = A_INVALID;
1298 break;
1299 }
1300 }
1301 #endif
1302 if (flags & ECF_NOCOMPLETE)
1303 {
1304 /*
1305 * The caller says we don't want any filename completion cmds.
1306 * Reject them.
1307 */
1308 switch (action)
1309 {
1310 case EC_F_COMPLETE:
1311 case EC_B_COMPLETE:
1312 case EC_EXPAND:
1313 action = A_INVALID;
1314 break;
1315 }
1316 }
1317 if ((flags & ECF_PEEK) || action == A_INVALID)
1318 {
1319 /*
1320 * We're just peeking, or we didn't understand the command.
1321 * Unget all the characters we read in the loop above.
1322 * This does NOT include the original character that was
1323 * passed in as a parameter.
1324 */
1325 while (nch > 1)
1326 {
1327 ungetcc(usercmd[--nch]);
1328 }
1329 } else
1330 {
1331 if (s != NULL)
1332 ungetsc(s);
1333 }
1334 return action;
1335 }
1336
1337