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