1 /* 2 * Copyright (C) 1984-2015 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 secure; 38 39 #define SK(k) \ 40 SK_SPECIAL_KEY, (k), 6, 1, 1, 1 41 /* 42 * Command table is ordered roughly according to expected 43 * frequency of use, so the common commands are near the beginning. 44 */ 45 46 static unsigned char cmdtable[] = 47 { 48 '\r',0, A_F_LINE, 49 '\n',0, A_F_LINE, 50 'e',0, A_F_LINE, 51 'j',0, A_F_LINE, 52 SK(SK_DOWN_ARROW),0, A_F_LINE, 53 CONTROL('E'),0, A_F_LINE, 54 CONTROL('N'),0, A_F_LINE, 55 'k',0, A_B_LINE, 56 'y',0, A_B_LINE, 57 CONTROL('Y'),0, A_B_LINE, 58 SK(SK_CONTROL_K),0, A_B_LINE, 59 CONTROL('P'),0, A_B_LINE, 60 SK(SK_UP_ARROW),0, A_B_LINE, 61 'J',0, A_FF_LINE, 62 'K',0, A_BF_LINE, 63 'Y',0, A_BF_LINE, 64 'd',0, A_F_SCROLL, 65 CONTROL('D'),0, A_F_SCROLL, 66 'u',0, A_B_SCROLL, 67 CONTROL('U'),0, A_B_SCROLL, 68 ' ',0, A_F_SCREEN, 69 'f',0, A_F_SCREEN, 70 CONTROL('F'),0, A_F_SCREEN, 71 CONTROL('V'),0, A_F_SCREEN, 72 SK(SK_PAGE_DOWN),0, A_F_SCREEN, 73 'b',0, A_B_SCREEN, 74 CONTROL('B'),0, A_B_SCREEN, 75 ESC,'v',0, A_B_SCREEN, 76 SK(SK_PAGE_UP),0, A_B_SCREEN, 77 'z',0, A_F_WINDOW, 78 'w',0, A_B_WINDOW, 79 ESC,' ',0, A_FF_SCREEN, 80 'F',0, A_F_FOREVER, 81 ESC,'F',0, A_F_UNTIL_HILITE, 82 'R',0, A_FREPAINT, 83 'r',0, A_REPAINT, 84 CONTROL('R'),0, A_REPAINT, 85 CONTROL('L'),0, A_REPAINT, 86 ESC,'u',0, A_UNDO_SEARCH, 87 'g',0, A_GOLINE, 88 SK(SK_HOME),0, A_GOLINE, 89 '<',0, A_GOLINE, 90 ESC,'<',0, A_GOLINE, 91 'p',0, A_PERCENT, 92 '%',0, A_PERCENT, 93 ESC,'[',0, A_LSHIFT, 94 ESC,']',0, A_RSHIFT, 95 ESC,'(',0, A_LSHIFT, 96 ESC,')',0, A_RSHIFT, 97 SK(SK_RIGHT_ARROW),0, A_RSHIFT, 98 SK(SK_LEFT_ARROW),0, A_LSHIFT, 99 '{',0, A_F_BRACKET|A_EXTRA, '{','}',0, 100 '}',0, A_B_BRACKET|A_EXTRA, '{','}',0, 101 '(',0, A_F_BRACKET|A_EXTRA, '(',')',0, 102 ')',0, A_B_BRACKET|A_EXTRA, '(',')',0, 103 '[',0, A_F_BRACKET|A_EXTRA, '[',']',0, 104 ']',0, A_B_BRACKET|A_EXTRA, '[',']',0, 105 ESC,CONTROL('F'),0, A_F_BRACKET, 106 ESC,CONTROL('B'),0, A_B_BRACKET, 107 'G',0, A_GOEND, 108 ESC,'G',0, A_GOEND_BUF, 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 '-',0, A_OPT_TOGGLE, 151 ':','t',0, A_OPT_TOGGLE|A_EXTRA, 't',0, 152 's',0, A_OPT_TOGGLE|A_EXTRA, 'o',0, 153 '_',0, A_DISP_OPTION, 154 '|',0, A_PIPE, 155 'v',0, A_VISUAL, 156 '!',0, A_SHELL, 157 '+',0, A_FIRSTCMD, 158 159 'H',0, A_HELP, 160 'h',0, A_HELP, 161 SK(SK_F1),0, A_HELP, 162 'V',0, A_VERSION, 163 'q',0, A_QUIT, 164 'Q',0, A_QUIT, 165 ':','q',0, A_QUIT, 166 ':','Q',0, A_QUIT, 167 'Z','Z',0, A_QUIT 168 }; 169 170 static unsigned char edittable[] = 171 { 172 '\t',0, EC_F_COMPLETE, /* TAB */ 173 '\17',0, EC_B_COMPLETE, /* BACKTAB */ 174 SK(SK_BACKTAB),0, EC_B_COMPLETE, /* BACKTAB */ 175 ESC,'\t',0, EC_B_COMPLETE, /* ESC TAB */ 176 CONTROL('L'),0, EC_EXPAND, /* CTRL-L */ 177 CONTROL('V'),0, EC_LITERAL, /* BACKSLASH */ 178 CONTROL('A'),0, EC_LITERAL, /* BACKSLASH */ 179 ESC,'l',0, EC_RIGHT, /* ESC l */ 180 SK(SK_RIGHT_ARROW),0, EC_RIGHT, /* RIGHTARROW */ 181 ESC,'h',0, EC_LEFT, /* ESC h */ 182 SK(SK_LEFT_ARROW),0, EC_LEFT, /* LEFTARROW */ 183 ESC,'b',0, EC_W_LEFT, /* ESC b */ 184 ESC,SK(SK_LEFT_ARROW),0, EC_W_LEFT, /* ESC LEFTARROW */ 185 SK(SK_CTL_LEFT_ARROW),0, EC_W_LEFT, /* CTRL-LEFTARROW */ 186 ESC,'w',0, EC_W_RIGHT, /* ESC w */ 187 ESC,SK(SK_RIGHT_ARROW),0, EC_W_RIGHT, /* ESC RIGHTARROW */ 188 SK(SK_CTL_RIGHT_ARROW),0, EC_W_RIGHT, /* CTRL-RIGHTARROW */ 189 ESC,'i',0, EC_INSERT, /* ESC i */ 190 SK(SK_INSERT),0, EC_INSERT, /* INSERT */ 191 ESC,'x',0, EC_DELETE, /* ESC x */ 192 SK(SK_DELETE),0, EC_DELETE, /* DELETE */ 193 ESC,'X',0, EC_W_DELETE, /* ESC X */ 194 ESC,SK(SK_DELETE),0, EC_W_DELETE, /* ESC DELETE */ 195 SK(SK_CTL_DELETE),0, EC_W_DELETE, /* CTRL-DELETE */ 196 SK(SK_CTL_BACKSPACE),0, EC_W_BACKSPACE, /* CTRL-BACKSPACE */ 197 ESC,'\b',0, EC_W_BACKSPACE, /* ESC BACKSPACE */ 198 ESC,'0',0, EC_HOME, /* ESC 0 */ 199 SK(SK_HOME),0, EC_HOME, /* HOME */ 200 ESC,'$',0, EC_END, /* ESC $ */ 201 SK(SK_END),0, EC_END, /* END */ 202 ESC,'k',0, EC_UP, /* ESC k */ 203 SK(SK_UP_ARROW),0, EC_UP, /* UPARROW */ 204 ESC,'j',0, EC_DOWN, /* ESC j */ 205 SK(SK_DOWN_ARROW),0, EC_DOWN, /* DOWNARROW */ 206 CONTROL('G'),0, EC_ABORT, /* CTRL-G */ 207 }; 208 209 /* 210 * Structure to support a list of command tables. 211 */ 212 struct tablelist 213 { 214 struct tablelist *t_next; 215 char *t_start; 216 char *t_end; 217 }; 218 219 /* 220 * List of command tables and list of line-edit tables. 221 */ 222 static struct tablelist *list_fcmd_tables = NULL; 223 static struct tablelist *list_ecmd_tables = NULL; 224 static struct tablelist *list_var_tables = NULL; 225 static struct tablelist *list_sysvar_tables = NULL; 226 227 228 /* 229 * Expand special key abbreviations in a command table. 230 */ 231 static void 232 expand_special_keys(char *table, int len) 233 { 234 char *fm; 235 char *to; 236 int a; 237 char *repl; 238 int klen; 239 240 for (fm = table; fm < table + len; ) 241 { 242 /* 243 * Rewrite each command in the table with any 244 * special key abbreviations expanded. 245 */ 246 for (to = fm; *fm != '\0'; ) 247 { 248 if (*fm != SK_SPECIAL_KEY) 249 { 250 *to++ = *fm++; 251 continue; 252 } 253 /* 254 * After SK_SPECIAL_KEY, next byte is the type 255 * of special key (one of the SK_* contants), 256 * and the byte after that is the number of bytes, 257 * N, reserved by the abbreviation (including the 258 * SK_SPECIAL_KEY and key type bytes). 259 * Replace all N bytes with the actual bytes 260 * output by the special key on this terminal. 261 */ 262 repl = special_key_str(fm[1]); 263 klen = fm[2] & 0377; 264 fm += klen; 265 if (repl == NULL || (int) strlen(repl) > klen) 266 repl = "\377"; 267 while (*repl != '\0') 268 *to++ = *repl++; 269 } 270 *to++ = '\0'; 271 /* 272 * Fill any unused bytes between end of command and 273 * the action byte with A_SKIP. 274 */ 275 while (to <= fm) 276 *to++ = A_SKIP; 277 fm++; 278 a = *fm++ & 0377; 279 if (a & A_EXTRA) 280 { 281 while (*fm++ != '\0') 282 continue; 283 } 284 } 285 } 286 287 /* 288 * Initialize the command lists. 289 */ 290 public void 291 init_cmds(void) 292 { 293 /* 294 * Add the default command tables. 295 */ 296 add_fcmd_table((char*)cmdtable, sizeof(cmdtable)); 297 add_ecmd_table((char*)edittable, sizeof(edittable)); 298 #if USERFILE 299 /* 300 * For backwards compatibility, 301 * try to add tables in the OLD system lesskey file. 302 */ 303 #ifdef BINDIR 304 add_hometable(NULL, BINDIR "/.sysless", 1); 305 #endif 306 /* 307 * Try to add the tables in the system lesskey file. 308 */ 309 add_hometable("LESSKEY_SYSTEM", LESSKEYFILE_SYS, 1); 310 /* 311 * Try to add the tables in the standard lesskey file "$HOME/.less". 312 */ 313 add_hometable("LESSKEY", LESSKEYFILE, 0); 314 #endif 315 } 316 317 /* 318 * Add a command table. 319 */ 320 static int 321 add_cmd_table(struct tablelist **tlist, char *buf, int len) 322 { 323 struct tablelist *t; 324 325 if (len == 0) 326 return (0); 327 /* 328 * Allocate a tablelist structure, initialize it, 329 * and link it into the list of tables. 330 */ 331 if ((t = (struct tablelist *) 332 calloc(1, sizeof(struct tablelist))) == NULL) 333 { 334 return (-1); 335 } 336 expand_special_keys(buf, len); 337 t->t_start = buf; 338 t->t_end = buf + len; 339 t->t_next = *tlist; 340 *tlist = t; 341 return (0); 342 } 343 344 /* 345 * Add a command table. 346 */ 347 public void 348 add_fcmd_table(char *buf, int len) 349 { 350 if (add_cmd_table(&list_fcmd_tables, buf, len) < 0) 351 error("Warning: some commands disabled", NULL_PARG); 352 } 353 354 /* 355 * Add an editing command table. 356 */ 357 public void 358 add_ecmd_table(char *buf, int len) 359 { 360 if (add_cmd_table(&list_ecmd_tables, buf, len) < 0) 361 error("Warning: some edit commands disabled", NULL_PARG); 362 } 363 364 /* 365 * Add an environment variable table. 366 */ 367 static void 368 add_var_table(struct tablelist **tlist, char *buf, int len) 369 { 370 if (add_cmd_table(tlist, buf, len) < 0) 371 error("Warning: environment variables from lesskey file unavailable", NULL_PARG); 372 } 373 374 /* 375 * Search a single command table for the command string in cmd. 376 */ 377 static int 378 cmd_search(char *cmd, char *table, char *endtable, char **sp) 379 { 380 char *p; 381 char *q; 382 int a; 383 384 *sp = NULL; 385 for (p = table, q = cmd; p < endtable; p++, q++) 386 { 387 if (*p == *q) 388 { 389 /* 390 * Current characters match. 391 * If we're at the end of the string, we've found it. 392 * Return the action code, which is the character 393 * after the null at the end of the string 394 * in the command table. 395 */ 396 if (*p == '\0') 397 { 398 a = *++p & 0377; 399 while (a == A_SKIP) 400 a = *++p & 0377; 401 if (a == A_END_LIST) 402 { 403 /* 404 * We get here only if the original 405 * cmd string passed in was empty (""). 406 * I don't think that can happen, 407 * but just in case ... 408 */ 409 return (A_UINVALID); 410 } 411 /* 412 * Check for an "extra" string. 413 */ 414 if (a & A_EXTRA) 415 { 416 *sp = ++p; 417 a &= ~A_EXTRA; 418 } 419 return (a); 420 } 421 } else if (*q == '\0') 422 { 423 /* 424 * Hit the end of the user's command, 425 * but not the end of the string in the command table. 426 * The user's command is incomplete. 427 */ 428 return (A_PREFIX); 429 } else 430 { 431 /* 432 * Not a match. 433 * Skip ahead to the next command in the 434 * command table, and reset the pointer 435 * to the beginning of the user's command. 436 */ 437 if (*p == '\0' && p[1] == A_END_LIST) 438 { 439 /* 440 * A_END_LIST is a special marker that tells 441 * us to abort the cmd search. 442 */ 443 return (A_UINVALID); 444 } 445 while (*p++ != '\0') 446 continue; 447 while (*p == A_SKIP) 448 p++; 449 if (*p & A_EXTRA) 450 while (*++p != '\0') 451 continue; 452 q = cmd-1; 453 } 454 } 455 /* 456 * No match found in the entire command table. 457 */ 458 return (A_INVALID); 459 } 460 461 /* 462 * Decode a command character and return the associated action. 463 * The "extra" string, if any, is returned in sp. 464 */ 465 static int 466 cmd_decode(struct tablelist *tlist, char *cmd, char **sp) 467 { 468 struct tablelist *t; 469 int action = A_INVALID; 470 471 /* 472 * Search thru all the command tables. 473 * Stop when we find an action which is not A_INVALID. 474 */ 475 for (t = tlist; t != NULL; t = t->t_next) 476 { 477 action = cmd_search(cmd, t->t_start, t->t_end, sp); 478 if (action != A_INVALID) 479 break; 480 } 481 if (action == A_UINVALID) 482 action = A_INVALID; 483 return (action); 484 } 485 486 /* 487 * Decode a command from the cmdtables list. 488 */ 489 public int 490 fcmd_decode(char *cmd, char **sp) 491 { 492 return (cmd_decode(list_fcmd_tables, cmd, sp)); 493 } 494 495 /* 496 * Decode a command from the edittables list. 497 */ 498 public int 499 ecmd_decode(char *cmd, char **sp) 500 { 501 return (cmd_decode(list_ecmd_tables, cmd, sp)); 502 } 503 504 /* 505 * Get the value of an environment variable. 506 * Looks first in the lesskey file, then in the real environment. 507 */ 508 public char * 509 lgetenv(char *var) 510 { 511 int a; 512 char *s; 513 514 a = cmd_decode(list_var_tables, var, &s); 515 if (a == EV_OK) 516 return (s); 517 s = getenv(var); 518 if (s != NULL && *s != '\0') 519 return (s); 520 a = cmd_decode(list_sysvar_tables, var, &s); 521 if (a == EV_OK) 522 return (s); 523 return (NULL); 524 } 525 526 #if USERFILE 527 /* 528 * Get an "integer" from a lesskey file. 529 * Integers are stored in a funny format: 530 * two bytes, low order first, in radix KRADIX. 531 */ 532 static int 533 gint(char **sp) 534 { 535 int n; 536 537 n = *(*sp)++; 538 n += *(*sp)++ * KRADIX; 539 return (n); 540 } 541 542 /* 543 * Process an old (pre-v241) lesskey file. 544 */ 545 static int 546 old_lesskey(char *buf, int len) 547 { 548 /* 549 * Old-style lesskey file. 550 * The file must end with either 551 * ...,cmd,0,action 552 * or ...,cmd,0,action|A_EXTRA,string,0 553 * 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 } 560 561 /* 562 * Process a new (post-v241) lesskey file. 563 */ 564 static int 565 new_lesskey(char *buf, int len, int sysvar) 566 { 567 char *p; 568 int c; 569 int n; 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; 580 for (;;) 581 { 582 c = *p++; 583 switch (c) 584 { 585 case CMD_SECTION: 586 n = gint(&p); 587 add_fcmd_table(p, n); 588 p += n; 589 break; 590 case EDIT_SECTION: 591 n = gint(&p); 592 add_ecmd_table(p, n); 593 p += n; 594 break; 595 case VAR_SECTION: 596 n = gint(&p); 597 add_var_table((sysvar) ? 598 &list_sysvar_tables : &list_var_tables, p, n); 599 p += n; 600 break; 601 case END_SECTION: 602 return (0); 603 default: 604 /* 605 * Unrecognized section type. 606 */ 607 return (-1); 608 } 609 } 610 } 611 612 /* 613 * Set up a user command table, based on a "lesskey" file. 614 */ 615 public int 616 lesskey(char *filename, int sysvar) 617 { 618 char *buf; 619 POSITION len; 620 long n; 621 int f; 622 623 if (secure) 624 return (1); 625 /* 626 * Try to open the lesskey file. 627 */ 628 filename = shell_unquote(filename); 629 f = open(filename, OPEN_READ); 630 free(filename); 631 if (f < 0) 632 return (1); 633 634 /* 635 * Read the file into a buffer. 636 * We first figure out the size of the file and allocate space for it. 637 * {{ Minimal error checking is done here. 638 * A garbage .less file will produce strange results. 639 * To avoid a large amount of error checking code here, we 640 * rely on the lesskey program to generate a good .less file. }} 641 */ 642 len = filesize(f); 643 if (len == NULL_POSITION || len < 3) 644 { 645 /* 646 * Bad file (valid file must have at least 3 chars). 647 */ 648 close(f); 649 return (-1); 650 } 651 if ((buf = (char *) calloc((int)len, sizeof(char))) == NULL) 652 { 653 close(f); 654 return (-1); 655 } 656 if (lseek(f, (off_t)0, SEEK_SET) == BAD_LSEEK) 657 { 658 free(buf); 659 close(f); 660 return (-1); 661 } 662 n = read(f, buf, (unsigned int) len); 663 close(f); 664 if (n != len) 665 { 666 free(buf); 667 return (-1); 668 } 669 670 /* 671 * Figure out if this is an old-style (before version 241) 672 * or new-style lesskey file format. 673 */ 674 if (buf[0] != C0_LESSKEY_MAGIC || buf[1] != C1_LESSKEY_MAGIC || 675 buf[2] != C2_LESSKEY_MAGIC || buf[3] != C3_LESSKEY_MAGIC) 676 return (old_lesskey(buf, (int)len)); 677 return (new_lesskey(buf, (int)len, sysvar)); 678 } 679 680 /* 681 * Add the standard lesskey file "$HOME/.less" 682 */ 683 public void 684 add_hometable(char *envname, char *def_filename, int sysvar) 685 { 686 char *filename; 687 PARG parg; 688 689 if (envname != NULL && (filename = lgetenv(envname)) != NULL) 690 filename = save(filename); 691 else if (sysvar) 692 filename = save(def_filename); 693 else 694 filename = homefile(def_filename); 695 if (filename == NULL) 696 return; 697 if (lesskey(filename, sysvar) < 0) 698 { 699 parg.p_string = filename; 700 error("Cannot use lesskey file \"%s\"", &parg); 701 } 702 free(filename); 703 } 704 #endif 705 706 /* 707 * See if a char is a special line-editing command. 708 */ 709 public int 710 editchar(int c, int flags) 711 { 712 int action; 713 int nch; 714 char *s; 715 char usercmd[MAX_CMDLEN+1]; 716 717 /* 718 * An editing character could actually be a sequence of characters; 719 * for example, an escape sequence sent by pressing the uparrow key. 720 * To match the editing string, we use the command decoder 721 * but give it the edit-commands command table 722 * This table is constructed to match the user's keyboard. 723 */ 724 if (c == erase_char || c == erase2_char) 725 return (EC_BACKSPACE); 726 if (c == kill_char) 727 return (EC_LINEKILL); 728 729 /* 730 * Collect characters in a buffer. 731 * Start with the one we have, and get more if we need them. 732 */ 733 nch = 0; 734 do { 735 if (nch > 0) 736 c = getcc(); 737 usercmd[nch] = c; 738 usercmd[nch+1] = '\0'; 739 nch++; 740 action = ecmd_decode(usercmd, &s); 741 } while (action == A_PREFIX); 742 743 if (flags & EC_NORIGHTLEFT) 744 { 745 switch (action) 746 { 747 case EC_RIGHT: 748 case EC_LEFT: 749 action = A_INVALID; 750 break; 751 } 752 } 753 #if CMD_HISTORY 754 if (flags & EC_NOHISTORY) 755 { 756 /* 757 * The caller says there is no history list. 758 * Reject any history-manipulation action. 759 */ 760 switch (action) 761 { 762 case EC_UP: 763 case EC_DOWN: 764 action = A_INVALID; 765 break; 766 } 767 } 768 #endif 769 #if TAB_COMPLETE_FILENAME 770 if (flags & EC_NOCOMPLETE) 771 { 772 /* 773 * The caller says we don't want any filename completion cmds. 774 * Reject them. 775 */ 776 switch (action) 777 { 778 case EC_F_COMPLETE: 779 case EC_B_COMPLETE: 780 case EC_EXPAND: 781 action = A_INVALID; 782 break; 783 } 784 } 785 #endif 786 if ((flags & EC_PEEK) || action == A_INVALID) 787 { 788 /* 789 * We're just peeking, or we didn't understand the command. 790 * Unget all the characters we read in the loop above. 791 * This does NOT include the original character that was 792 * passed in as a parameter. 793 */ 794 while (nch > 1) 795 { 796 ungetcc(usercmd[--nch]); 797 } 798 } else 799 { 800 if (s != NULL) 801 ungetsc(s); 802 } 803 return action; 804 } 805 806