1 /* 2 * Copyright (C) 1984-2000 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 about less, or for information on how to 8 * contact the author, see the README file. 9 */ 10 11 12 /* 13 * Routines to decode user commands. 14 * 15 * This is all table driven. 16 * A command table is a sequence of command descriptors. 17 * Each command descriptor is a sequence of bytes with the following format: 18 * <c1><c2>...<cN><0><action> 19 * The characters c1,c2,...,cN are the command string; that is, 20 * the characters which the user must type. 21 * It is terminated by a null <0> byte. 22 * The byte after the null byte is the action code associated 23 * with the command string. 24 * If an action byte is OR-ed with A_EXTRA, this indicates 25 * that the option byte is followed by an extra string. 26 * 27 * There may be many command tables. 28 * The first (default) table is built-in. 29 * Other tables are read in from "lesskey" files. 30 * All the tables are linked together and are searched in order. 31 */ 32 33 #include "less.h" 34 #include "cmd.h" 35 #include "lesskey.h" 36 37 extern int erase_char, kill_char; 38 extern int secure; 39 40 #define SK(k) \ 41 SK_SPECIAL_KEY, (k), 6, 1, 1, 1 42 /* 43 * Command table is ordered roughly according to expected 44 * frequency of use, so the common commands are near the beginning. 45 */ 46 47 static unsigned char cmdtable[] = 48 { 49 '\r',0, A_F_LINE, 50 '\n',0, A_F_LINE, 51 'e',0, A_F_LINE, 52 'j',0, A_F_LINE, 53 SK(SK_DOWN_ARROW),0, A_F_LINE, 54 CONTROL('E'),0, A_F_LINE, 55 CONTROL('N'),0, A_F_LINE, 56 'k',0, A_B_LINE, 57 'y',0, A_B_LINE, 58 CONTROL('Y'),0, A_B_LINE, 59 SK(SK_CONTROL_K),0, A_B_LINE, 60 CONTROL('P'),0, A_B_LINE, 61 SK(SK_UP_ARROW),0, A_B_LINE, 62 'J',0, A_FF_LINE, 63 'K',0, A_BF_LINE, 64 'Y',0, A_BF_LINE, 65 'd',0, A_F_SCROLL, 66 CONTROL('D'),0, A_F_SCROLL, 67 'u',0, A_B_SCROLL, 68 CONTROL('U'),0, A_B_SCROLL, 69 ' ',0, A_F_SCREEN, 70 'f',0, A_F_SCREEN, 71 CONTROL('F'),0, A_F_SCREEN, 72 CONTROL('V'),0, A_F_SCREEN, 73 SK(SK_PAGE_DOWN),0, A_F_SCREEN, 74 'b',0, A_B_SCREEN, 75 CONTROL('B'),0, A_B_SCREEN, 76 ESC,'v',0, A_B_SCREEN, 77 SK(SK_PAGE_UP),0, A_B_SCREEN, 78 'z',0, A_F_WINDOW, 79 'w',0, A_B_WINDOW, 80 ESC,' ',0, A_FF_SCREEN, 81 'F',0, A_F_FOREVER, 82 '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,'>',0, A_GOEND, 109 '>',0, A_GOEND, 110 SK(SK_END),0, A_GOEND, 111 'P',0, A_GOPOS, 112 113 '0',0, A_DIGIT, 114 '1',0, A_DIGIT, 115 '2',0, A_DIGIT, 116 '3',0, A_DIGIT, 117 '4',0, A_DIGIT, 118 '5',0, A_DIGIT, 119 '6',0, A_DIGIT, 120 '7',0, A_DIGIT, 121 '8',0, A_DIGIT, 122 '9',0, A_DIGIT, 123 124 '=',0, A_STAT, 125 CONTROL('G'),0, A_STAT, 126 ':','f',0, A_STAT, 127 '/',0, A_F_SEARCH, 128 '?',0, A_B_SEARCH, 129 ESC,'/',0, A_F_SEARCH|A_EXTRA, '*',0, 130 ESC,'?',0, A_B_SEARCH|A_EXTRA, '*',0, 131 'n',0, A_AGAIN_SEARCH, 132 ESC,'n',0, A_T_AGAIN_SEARCH, 133 'N',0, A_REVERSE_SEARCH, 134 ESC,'N',0, A_T_REVERSE_SEARCH, 135 'm',0, A_SETMARK, 136 '\'',0, A_GOMARK, 137 CONTROL('X'),CONTROL('X'),0, A_GOMARK, 138 'E',0, A_EXAMINE, 139 ':','e',0, A_EXAMINE, 140 CONTROL('X'),CONTROL('V'),0, A_EXAMINE, 141 ':','n',0, A_NEXT_FILE, 142 ':','p',0, A_PREV_FILE, 143 ':','x',0, A_INDEX_FILE, 144 ':','d',0, A_REMOVE_FILE, 145 '-',0, A_OPT_TOGGLE, 146 ':','t',0, A_OPT_TOGGLE|A_EXTRA, 't',0, 147 's',0, A_OPT_TOGGLE|A_EXTRA, 'o',0, 148 '_',0, A_DISP_OPTION, 149 '|',0, A_PIPE, 150 'v',0, A_VISUAL, 151 '!',0, A_SHELL, 152 '+',0, A_FIRSTCMD, 153 154 'H',0, A_HELP, 155 'h',0, A_HELP, 156 SK(SK_F1),0, A_HELP, 157 'V',0, A_VERSION, 158 'q',0, A_QUIT, 159 'Q',0, A_QUIT, 160 ':','q',0, A_QUIT, 161 ':','Q',0, A_QUIT, 162 'Z','Z',0, A_QUIT 163 }; 164 165 static unsigned char edittable[] = 166 { 167 '\t',0, EC_F_COMPLETE, /* TAB */ 168 '\17',0, EC_B_COMPLETE, /* BACKTAB */ 169 SK(SK_BACKTAB),0, EC_B_COMPLETE, /* BACKTAB */ 170 ESC,'\t',0, EC_B_COMPLETE, /* ESC TAB */ 171 CONTROL('L'),0, EC_EXPAND, /* CTRL-L */ 172 CONTROL('V'),0, EC_LITERAL, /* BACKSLASH */ 173 CONTROL('A'),0, EC_LITERAL, /* BACKSLASH */ 174 ESC,'l',0, EC_RIGHT, /* ESC l */ 175 SK(SK_RIGHT_ARROW),0, EC_RIGHT, /* RIGHTARROW */ 176 ESC,'h',0, EC_LEFT, /* ESC h */ 177 SK(SK_LEFT_ARROW),0, EC_LEFT, /* LEFTARROW */ 178 ESC,'b',0, EC_W_LEFT, /* ESC b */ 179 ESC,SK(SK_LEFT_ARROW),0, EC_W_LEFT, /* ESC LEFTARROW */ 180 SK(SK_CTL_LEFT_ARROW),0, EC_W_LEFT, /* CTRL-LEFTARROW */ 181 ESC,'w',0, EC_W_RIGHT, /* ESC w */ 182 ESC,SK(SK_RIGHT_ARROW),0, EC_W_RIGHT, /* ESC RIGHTARROW */ 183 SK(SK_CTL_RIGHT_ARROW),0, EC_W_RIGHT, /* CTRL-RIGHTARROW */ 184 ESC,'i',0, EC_INSERT, /* ESC i */ 185 SK(SK_INSERT),0, EC_INSERT, /* INSERT */ 186 ESC,'x',0, EC_DELETE, /* ESC x */ 187 SK(SK_DELETE),0, EC_DELETE, /* DELETE */ 188 ESC,'X',0, EC_W_DELETE, /* ESC X */ 189 ESC,SK(SK_DELETE),0, EC_W_DELETE, /* ESC DELETE */ 190 SK(SK_CTL_DELETE),0, EC_W_DELETE, /* CTRL-DELETE */ 191 SK(SK_CTL_BACKSPACE),0, EC_W_BACKSPACE, /* CTRL-BACKSPACE */ 192 ESC,'\b',0, EC_W_BACKSPACE, /* ESC BACKSPACE */ 193 ESC,'0',0, EC_HOME, /* ESC 0 */ 194 SK(SK_HOME),0, EC_HOME, /* HOME */ 195 ESC,'$',0, EC_END, /* ESC $ */ 196 SK(SK_END),0, EC_END, /* END */ 197 ESC,'k',0, EC_UP, /* ESC k */ 198 SK(SK_UP_ARROW),0, EC_UP, /* UPARROW */ 199 ESC,'j',0, EC_DOWN, /* ESC j */ 200 SK(SK_DOWN_ARROW),0, EC_DOWN, /* DOWNARROW */ 201 }; 202 203 /* 204 * Structure to support a list of command tables. 205 */ 206 struct tablelist 207 { 208 struct tablelist *t_next; 209 char *t_start; 210 char *t_end; 211 }; 212 213 /* 214 * List of command tables and list of line-edit tables. 215 */ 216 static struct tablelist *list_fcmd_tables = NULL; 217 static struct tablelist *list_ecmd_tables = NULL; 218 static struct tablelist *list_var_tables = NULL; 219 static struct tablelist *list_sysvar_tables = NULL; 220 221 222 /* 223 * Expand special key abbreviations in a command table. 224 */ 225 static void 226 expand_special_keys(table, len) 227 char *table; 228 int len; 229 { 230 register char *fm; 231 register char *to; 232 register int a; 233 char *repl; 234 int klen; 235 236 for (fm = table; fm < table + len; ) 237 { 238 /* 239 * Rewrite each command in the table with any 240 * special key abbreviations expanded. 241 */ 242 for (to = fm; *fm != '\0'; ) 243 { 244 if (*fm != SK_SPECIAL_KEY) 245 { 246 *to++ = *fm++; 247 continue; 248 } 249 /* 250 * After SK_SPECIAL_KEY, next byte is the type 251 * of special key (one of the SK_* contants), 252 * and the byte after that is the number of bytes, 253 * N, reserved by the abbreviation (including the 254 * SK_SPECIAL_KEY and key type bytes). 255 * Replace all N bytes with the actual bytes 256 * output by the special key on this terminal. 257 */ 258 repl = special_key_str(fm[1]); 259 klen = fm[2] & 0377; 260 fm += klen; 261 if (repl == NULL || strlen(repl) > klen) 262 repl = "\377"; 263 while (*repl != '\0') 264 *to++ = *repl++; 265 } 266 *to++ = '\0'; 267 /* 268 * Fill any unused bytes between end of command and 269 * the action byte with A_SKIP. 270 */ 271 while (to <= fm) 272 *to++ = A_SKIP; 273 fm++; 274 a = *fm++ & 0377; 275 if (a & A_EXTRA) 276 { 277 while (*fm++ != '\0') 278 continue; 279 } 280 } 281 } 282 283 /* 284 * Initialize the command lists. 285 */ 286 public void 287 init_cmds() 288 { 289 /* 290 * Add the default command tables. 291 */ 292 add_fcmd_table((char*)cmdtable, sizeof(cmdtable)); 293 add_ecmd_table((char*)edittable, sizeof(edittable)); 294 #if USERFILE 295 /* 296 * Try to add the tables in the system lesskey file. 297 */ 298 add_hometable("LESSKEY_SYSTEM", LESSKEYFILE_SYS, 1); 299 /* 300 * Try to add the tables in the standard lesskey file "$HOME/.less". 301 */ 302 add_hometable("LESSKEY", LESSKEYFILE, 0); 303 #endif 304 } 305 306 /* 307 * Add a command table. 308 */ 309 static int 310 add_cmd_table(tlist, buf, len) 311 struct tablelist **tlist; 312 char *buf; 313 int len; 314 { 315 register struct tablelist *t; 316 317 if (len == 0) 318 return (0); 319 /* 320 * Allocate a tablelist structure, initialize it, 321 * and link it into the list of tables. 322 */ 323 if ((t = (struct tablelist *) 324 calloc(1, sizeof(struct tablelist))) == NULL) 325 { 326 return (-1); 327 } 328 expand_special_keys(buf, len); 329 t->t_start = buf; 330 t->t_end = buf + len; 331 t->t_next = *tlist; 332 *tlist = t; 333 return (0); 334 } 335 336 /* 337 * Add a command table. 338 */ 339 public void 340 add_fcmd_table(buf, len) 341 char *buf; 342 int len; 343 { 344 if (add_cmd_table(&list_fcmd_tables, buf, len) < 0) 345 error("Warning: some commands disabled", NULL_PARG); 346 } 347 348 /* 349 * Add an editing command table. 350 */ 351 public void 352 add_ecmd_table(buf, len) 353 char *buf; 354 int len; 355 { 356 if (add_cmd_table(&list_ecmd_tables, buf, len) < 0) 357 error("Warning: some edit commands disabled", NULL_PARG); 358 } 359 360 /* 361 * Add an environment variable table. 362 */ 363 static void 364 add_var_table(tlist, buf, len) 365 struct tablelist **tlist; 366 char *buf; 367 int len; 368 { 369 if (add_cmd_table(tlist, buf, len) < 0) 370 error("Warning: environment variables from lesskey file unavailable", NULL_PARG); 371 } 372 373 /* 374 * Search a single command table for the command string in cmd. 375 */ 376 public int 377 cmd_search(cmd, table, endtable, sp) 378 char *cmd; 379 char *table; 380 char *endtable; 381 char **sp; 382 { 383 register char *p; 384 register char *q; 385 register int a; 386 387 for (p = table, q = cmd; p < endtable; p++, q++) 388 { 389 if (*p == *q) 390 { 391 /* 392 * Current characters match. 393 * If we're at the end of the string, we've found it. 394 * Return the action code, which is the character 395 * after the null at the end of the string 396 * in the command table. 397 */ 398 if (*p == '\0') 399 { 400 a = *++p & 0377; 401 while (a == A_SKIP) 402 a = *++p & 0377; 403 if (a == A_END_LIST) 404 { 405 /* 406 * We get here only if the original 407 * cmd string passed in was empty (""). 408 * I don't think that can happen, 409 * but just in case ... 410 */ 411 return (A_UINVALID); 412 } 413 /* 414 * Check for an "extra" string. 415 */ 416 if (a & A_EXTRA) 417 { 418 *sp = ++p; 419 a &= ~A_EXTRA; 420 } else 421 *sp = NULL; 422 return (a); 423 } 424 } else if (*q == '\0') 425 { 426 /* 427 * Hit the end of the user's command, 428 * but not the end of the string in the command table. 429 * The user's command is incomplete. 430 */ 431 return (A_PREFIX); 432 } else 433 { 434 /* 435 * Not a match. 436 * Skip ahead to the next command in the 437 * command table, and reset the pointer 438 * to the beginning of the user's command. 439 */ 440 if (*p == '\0' && p[1] == A_END_LIST) 441 { 442 /* 443 * A_END_LIST is a special marker that tells 444 * us to abort the cmd search. 445 */ 446 return (A_UINVALID); 447 } 448 while (*p++ != '\0') 449 continue; 450 while (*p == A_SKIP) 451 p++; 452 if (*p & A_EXTRA) 453 while (*++p != '\0') 454 continue; 455 q = cmd-1; 456 } 457 } 458 /* 459 * No match found in the entire command table. 460 */ 461 return (A_INVALID); 462 } 463 464 /* 465 * Decode a command character and return the associated action. 466 * The "extra" string, if any, is returned in sp. 467 */ 468 static int 469 cmd_decode(tlist, cmd, sp) 470 struct tablelist *tlist; 471 char *cmd; 472 char **sp; 473 { 474 register struct tablelist *t; 475 register int action = A_INVALID; 476 477 /* 478 * Search thru all the command tables. 479 * Stop when we find an action which is not A_INVALID. 480 */ 481 for (t = tlist; t != NULL; t = t->t_next) 482 { 483 action = cmd_search(cmd, t->t_start, t->t_end, sp); 484 if (action != A_INVALID) 485 break; 486 } 487 return (action); 488 } 489 490 /* 491 * Decode a command from the cmdtables list. 492 */ 493 public int 494 fcmd_decode(cmd, sp) 495 char *cmd; 496 char **sp; 497 { 498 return (cmd_decode(list_fcmd_tables, cmd, sp)); 499 } 500 501 /* 502 * Decode a command from the edittables list. 503 */ 504 public int 505 ecmd_decode(cmd, sp) 506 char *cmd; 507 char **sp; 508 { 509 return (cmd_decode(list_ecmd_tables, cmd, sp)); 510 } 511 512 /* 513 * Get the value of an environment variable. 514 * Looks first in the lesskey file, then in the real environment. 515 */ 516 public char * 517 lgetenv(var) 518 char *var; 519 { 520 int a; 521 char *s; 522 523 a = cmd_decode(list_var_tables, var, &s); 524 if (a == EV_OK) 525 return (s); 526 s = getenv(var); 527 if (s != NULL && *s != '\0') 528 return (s); 529 a = cmd_decode(list_sysvar_tables, var, &s); 530 if (a == EV_OK) 531 return (s); 532 return (NULL); 533 } 534 535 #if USERFILE 536 /* 537 * Get an "integer" from a lesskey file. 538 * Integers are stored in a funny format: 539 * two bytes, low order first, in radix KRADIX. 540 */ 541 static int 542 gint(sp) 543 char **sp; 544 { 545 int n; 546 547 n = *(*sp)++; 548 n += *(*sp)++ * KRADIX; 549 return (n); 550 } 551 552 /* 553 * Process an old (pre-v241) lesskey file. 554 */ 555 static int 556 old_lesskey(buf, len) 557 char *buf; 558 int len; 559 { 560 /* 561 * Old-style lesskey file. 562 * The file must end with either 563 * ...,cmd,0,action 564 * or ...,cmd,0,action|A_EXTRA,string,0 565 * So the last byte or the second to last byte must be zero. 566 */ 567 if (buf[len-1] != '\0' && buf[len-2] != '\0') 568 return (-1); 569 add_fcmd_table(buf, len); 570 return (0); 571 } 572 573 /* 574 * Process a new (post-v241) lesskey file. 575 */ 576 static int 577 new_lesskey(buf, len, sysvar) 578 char *buf; 579 int len; 580 int sysvar; 581 { 582 char *p; 583 register int c; 584 register int n; 585 586 /* 587 * New-style lesskey file. 588 * Extract the pieces. 589 */ 590 if (buf[len-3] != C0_END_LESSKEY_MAGIC || 591 buf[len-2] != C1_END_LESSKEY_MAGIC || 592 buf[len-1] != C2_END_LESSKEY_MAGIC) 593 return (-1); 594 p = buf + 4; 595 for (;;) 596 { 597 c = *p++; 598 switch (c) 599 { 600 case CMD_SECTION: 601 n = gint(&p); 602 add_fcmd_table(p, n); 603 p += n; 604 break; 605 case EDIT_SECTION: 606 n = gint(&p); 607 add_ecmd_table(p, n); 608 p += n; 609 break; 610 case VAR_SECTION: 611 n = gint(&p); 612 add_var_table((sysvar) ? 613 &list_sysvar_tables : &list_var_tables, p, n); 614 p += n; 615 break; 616 case END_SECTION: 617 return (0); 618 default: 619 /* 620 * Unrecognized section type. 621 */ 622 return (-1); 623 } 624 } 625 } 626 627 /* 628 * Set up a user command table, based on a "lesskey" file. 629 */ 630 public int 631 lesskey(filename, sysvar) 632 char *filename; 633 int sysvar; 634 { 635 register char *buf; 636 register POSITION len; 637 register long n; 638 register int f; 639 640 if (secure) 641 return (1); 642 /* 643 * Try to open the lesskey file. 644 */ 645 filename = unquote_file(filename); 646 f = open(filename, OPEN_READ); 647 free(filename); 648 if (f < 0) 649 return (1); 650 651 /* 652 * Read the file into a buffer. 653 * We first figure out the size of the file and allocate space for it. 654 * {{ Minimal error checking is done here. 655 * A garbage .less file will produce strange results. 656 * To avoid a large amount of error checking code here, we 657 * rely on the lesskey program to generate a good .less file. }} 658 */ 659 len = filesize(f); 660 if (len == NULL_POSITION || len < 3) 661 { 662 /* 663 * Bad file (valid file must have at least 3 chars). 664 */ 665 close(f); 666 return (-1); 667 } 668 if ((buf = (char *) calloc((int)len, sizeof(char))) == NULL) 669 { 670 close(f); 671 return (-1); 672 } 673 if (lseek(f, (off_t)0, 0) == BAD_LSEEK) 674 { 675 free(buf); 676 close(f); 677 return (-1); 678 } 679 n = read(f, buf, (unsigned int) len); 680 close(f); 681 if (n != len) 682 { 683 free(buf); 684 return (-1); 685 } 686 687 /* 688 * Figure out if this is an old-style (before version 241) 689 * or new-style lesskey file format. 690 */ 691 if (buf[0] != C0_LESSKEY_MAGIC || buf[1] != C1_LESSKEY_MAGIC || 692 buf[2] != C2_LESSKEY_MAGIC || buf[3] != C3_LESSKEY_MAGIC) 693 return (old_lesskey(buf, (int)len)); 694 return (new_lesskey(buf, (int)len, sysvar)); 695 } 696 697 /* 698 * Add the standard lesskey file "$HOME/.less" 699 */ 700 public void 701 add_hometable(envname, def_filename, sysvar) 702 char *envname; 703 char *def_filename; 704 int sysvar; 705 { 706 char *filename; 707 PARG parg; 708 709 if ((filename = lgetenv(envname)) != NULL) 710 filename = save(filename); 711 else if (sysvar) 712 filename = save(def_filename); 713 else 714 filename = homefile(def_filename); 715 if (filename == NULL) 716 return; 717 if (lesskey(filename, sysvar) < 0) 718 { 719 parg.p_string = filename; 720 error("Cannot use lesskey file \"%s\"", &parg); 721 } 722 free(filename); 723 } 724 #endif 725 726 /* 727 * See if a char is a special line-editing command. 728 */ 729 public int 730 editchar(c, flags) 731 int c; 732 int flags; 733 { 734 int action; 735 int nch; 736 char *s; 737 char usercmd[MAX_CMDLEN+1]; 738 739 /* 740 * An editing character could actually be a sequence of characters; 741 * for example, an escape sequence sent by pressing the uparrow key. 742 * To match the editing string, we use the command decoder 743 * but give it the edit-commands command table 744 * This table is constructed to match the user's keyboard. 745 */ 746 if (c == erase_char) 747 return (EC_BACKSPACE); 748 if (c == kill_char) 749 return (EC_LINEKILL); 750 751 /* 752 * Collect characters in a buffer. 753 * Start with the one we have, and get more if we need them. 754 */ 755 nch = 0; 756 do { 757 if (nch > 0) 758 c = getcc(); 759 usercmd[nch] = c; 760 usercmd[nch+1] = '\0'; 761 nch++; 762 action = ecmd_decode(usercmd, &s); 763 } while (action == A_PREFIX); 764 765 #if CMD_HISTORY 766 if (flags & EC_NOHISTORY) 767 { 768 /* 769 * The caller says there is no history list. 770 * Reject any history-manipulation action. 771 */ 772 switch (action) 773 { 774 case EC_UP: 775 case EC_DOWN: 776 action = A_INVALID; 777 break; 778 } 779 } 780 #endif 781 #if TAB_COMPLETE_FILENAME 782 if (flags & EC_NOCOMPLETE) 783 { 784 /* 785 * The caller says we don't want any filename completion cmds. 786 * Reject them. 787 */ 788 switch (action) 789 { 790 case EC_F_COMPLETE: 791 case EC_B_COMPLETE: 792 case EC_EXPAND: 793 action = A_INVALID; 794 break; 795 } 796 } 797 #endif 798 if ((flags & EC_PEEK) || action == A_INVALID) 799 { 800 /* 801 * We're just peeking, or we didn't understand the command. 802 * Unget all the characters we read in the loop above. 803 * This does NOT include the original character that was 804 * passed in as a parameter. 805 */ 806 while (nch > 1) 807 { 808 ungetcc(usercmd[--nch]); 809 } 810 } else 811 { 812 if (s != NULL) 813 ungetsc(s); 814 } 815 return action; 816 } 817 818