1 /* 2 * Copyright (C) 1984-2020 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 * Functions which manipulate the command buffer. 13 * Used only by command() and related functions. 14 */ 15 16 #include "less.h" 17 #include "cmd.h" 18 #include "charset.h" 19 #if HAVE_STAT 20 #include <sys/stat.h> 21 #endif 22 23 extern int sc_width; 24 extern int utf_mode; 25 extern int no_hist_dups; 26 extern int marks_modified; 27 28 static char cmdbuf[CMDBUF_SIZE]; /* Buffer for holding a multi-char command */ 29 static int cmd_col; /* Current column of the cursor */ 30 static int prompt_col; /* Column of cursor just after prompt */ 31 static char *cp; /* Pointer into cmdbuf */ 32 static int cmd_offset; /* Index into cmdbuf of first displayed char */ 33 static int literal; /* Next input char should not be interpreted */ 34 static int updown_match = -1; /* Prefix length in up/down movement */ 35 36 #if TAB_COMPLETE_FILENAME 37 static int cmd_complete LESSPARAMS((int action)); 38 /* 39 * These variables are statics used by cmd_complete. 40 */ 41 static int in_completion = 0; 42 static char *tk_text; 43 static char *tk_original; 44 static char *tk_ipoint; 45 static char *tk_trial = NULL; 46 static struct textlist tk_tlist; 47 #endif 48 49 static int cmd_left(); 50 static int cmd_right(); 51 52 #if SPACES_IN_FILENAMES 53 public char openquote = '"'; 54 public char closequote = '"'; 55 #endif 56 57 #if CMD_HISTORY 58 59 /* History file */ 60 #define HISTFILE_FIRST_LINE ".less-history-file:" 61 #define HISTFILE_SEARCH_SECTION ".search" 62 #define HISTFILE_SHELL_SECTION ".shell" 63 #define HISTFILE_MARK_SECTION ".mark" 64 65 /* 66 * A mlist structure represents a command history. 67 */ 68 struct mlist 69 { 70 struct mlist *next; 71 struct mlist *prev; 72 struct mlist *curr_mp; 73 char *string; 74 int modified; 75 }; 76 77 /* 78 * These are the various command histories that exist. 79 */ 80 struct mlist mlist_search = 81 { &mlist_search, &mlist_search, &mlist_search, NULL, 0 }; 82 public void *ml_search = (void *) &mlist_search; 83 84 struct mlist mlist_examine = 85 { &mlist_examine, &mlist_examine, &mlist_examine, NULL, 0 }; 86 public void *ml_examine = (void *) &mlist_examine; 87 88 #if SHELL_ESCAPE || PIPEC 89 struct mlist mlist_shell = 90 { &mlist_shell, &mlist_shell, &mlist_shell, NULL, 0 }; 91 public void *ml_shell = (void *) &mlist_shell; 92 #endif 93 94 #else /* CMD_HISTORY */ 95 96 /* If CMD_HISTORY is off, these are just flags. */ 97 public void *ml_search = (void *)1; 98 public void *ml_examine = (void *)2; 99 #if SHELL_ESCAPE || PIPEC 100 public void *ml_shell = (void *)3; 101 #endif 102 103 #endif /* CMD_HISTORY */ 104 105 /* 106 * History for the current command. 107 */ 108 static struct mlist *curr_mlist = NULL; 109 static int curr_cmdflags; 110 111 static char cmd_mbc_buf[MAX_UTF_CHAR_LEN]; 112 static int cmd_mbc_buf_len; 113 static int cmd_mbc_buf_index; 114 115 116 /* 117 * Reset command buffer (to empty). 118 */ 119 public void 120 cmd_reset(VOID_PARAM) 121 { 122 cp = cmdbuf; 123 *cp = '\0'; 124 cmd_col = 0; 125 cmd_offset = 0; 126 literal = 0; 127 cmd_mbc_buf_len = 0; 128 updown_match = -1; 129 } 130 131 /* 132 * Clear command line. 133 */ 134 public void 135 clear_cmd(VOID_PARAM) 136 { 137 cmd_col = prompt_col = 0; 138 cmd_mbc_buf_len = 0; 139 updown_match = -1; 140 } 141 142 /* 143 * Display a string, usually as a prompt for input into the command buffer. 144 */ 145 public void 146 cmd_putstr(s) 147 constant char *s; 148 { 149 LWCHAR prev_ch = 0; 150 LWCHAR ch; 151 constant char *endline = s + strlen(s); 152 while (*s != '\0') 153 { 154 char *ns = (char *) s; 155 int width; 156 ch = step_char(&ns, +1, endline); 157 while (s < ns) 158 putchr(*s++); 159 if (!utf_mode) 160 width = 1; 161 else if (is_composing_char(ch) || is_combining_char(prev_ch, ch)) 162 width = 0; 163 else 164 width = is_wide_char(ch) ? 2 : 1; 165 cmd_col += width; 166 prompt_col += width; 167 prev_ch = ch; 168 } 169 } 170 171 /* 172 * How many characters are in the command buffer? 173 */ 174 public int 175 len_cmdbuf(VOID_PARAM) 176 { 177 char *s = cmdbuf; 178 char *endline = s + strlen(s); 179 int len = 0; 180 181 while (*s != '\0') 182 { 183 step_char(&s, +1, endline); 184 len++; 185 } 186 return (len); 187 } 188 189 /* 190 * Common part of cmd_step_right() and cmd_step_left(). 191 * {{ Returning pwidth and bswidth separately is a historical artifact 192 * since they're always the same. Maybe clean this up someday. }} 193 */ 194 static char * 195 cmd_step_common(p, ch, len, pwidth, bswidth) 196 char *p; 197 LWCHAR ch; 198 int len; 199 int *pwidth; 200 int *bswidth; 201 { 202 char *pr; 203 int width; 204 205 if (len == 1) 206 { 207 pr = prchar((int) ch); 208 width = (int) strlen(pr); 209 } else 210 { 211 pr = prutfchar(ch); 212 if (is_composing_char(ch)) 213 width = 0; 214 else if (is_ubin_char(ch)) 215 width = (int) strlen(pr); 216 else 217 { 218 LWCHAR prev_ch = step_char(&p, -1, cmdbuf); 219 if (is_combining_char(prev_ch, ch)) 220 width = 0; 221 else 222 width = is_wide_char(ch) ? 2 : 1; 223 } 224 } 225 if (pwidth != NULL) 226 *pwidth = width; 227 if (bswidth != NULL) 228 *bswidth = width; 229 return (pr); 230 } 231 232 /* 233 * Step a pointer one character right in the command buffer. 234 */ 235 static char * 236 cmd_step_right(pp, pwidth, bswidth) 237 char **pp; 238 int *pwidth; 239 int *bswidth; 240 { 241 char *p = *pp; 242 LWCHAR ch = step_char(pp, +1, p + strlen(p)); 243 244 return cmd_step_common(p, ch, *pp - p, pwidth, bswidth); 245 } 246 247 /* 248 * Step a pointer one character left in the command buffer. 249 */ 250 static char * 251 cmd_step_left(pp, pwidth, bswidth) 252 char **pp; 253 int *pwidth; 254 int *bswidth; 255 { 256 char *p = *pp; 257 LWCHAR ch = step_char(pp, -1, cmdbuf); 258 259 return cmd_step_common(*pp, ch, p - *pp, pwidth, bswidth); 260 } 261 262 /* 263 * Repaint the line from cp onwards. 264 * Then position the cursor just after the char old_cp (a pointer into cmdbuf). 265 */ 266 static void 267 cmd_repaint(old_cp) 268 constant char *old_cp; 269 { 270 /* 271 * Repaint the line from the current position. 272 */ 273 clear_eol(); 274 while (*cp != '\0') 275 { 276 char *np = cp; 277 int width; 278 char *pr = cmd_step_right(&np, &width, NULL); 279 if (cmd_col + width >= sc_width) 280 break; 281 cp = np; 282 putstr(pr); 283 cmd_col += width; 284 } 285 while (*cp != '\0') 286 { 287 char *np = cp; 288 int width; 289 char *pr = cmd_step_right(&np, &width, NULL); 290 if (width > 0) 291 break; 292 cp = np; 293 putstr(pr); 294 } 295 296 /* 297 * Back up the cursor to the correct position. 298 */ 299 while (cp > old_cp) 300 cmd_left(); 301 } 302 303 /* 304 * Put the cursor at "home" (just after the prompt), 305 * and set cp to the corresponding char in cmdbuf. 306 */ 307 static void 308 cmd_home(VOID_PARAM) 309 { 310 while (cmd_col > prompt_col) 311 { 312 int width, bswidth; 313 314 cmd_step_left(&cp, &width, &bswidth); 315 while (bswidth-- > 0) 316 putbs(); 317 cmd_col -= width; 318 } 319 320 cp = &cmdbuf[cmd_offset]; 321 } 322 323 /* 324 * Shift the cmdbuf display left a half-screen. 325 */ 326 static void 327 cmd_lshift(VOID_PARAM) 328 { 329 char *s; 330 char *save_cp; 331 int cols; 332 333 /* 334 * Start at the first displayed char, count how far to the 335 * right we'd have to move to reach the center of the screen. 336 */ 337 s = cmdbuf + cmd_offset; 338 cols = 0; 339 while (cols < (sc_width - prompt_col) / 2 && *s != '\0') 340 { 341 int width; 342 cmd_step_right(&s, &width, NULL); 343 cols += width; 344 } 345 while (*s != '\0') 346 { 347 int width; 348 char *ns = s; 349 cmd_step_right(&ns, &width, NULL); 350 if (width > 0) 351 break; 352 s = ns; 353 } 354 355 cmd_offset = (int) (s - cmdbuf); 356 save_cp = cp; 357 cmd_home(); 358 cmd_repaint(save_cp); 359 } 360 361 /* 362 * Shift the cmdbuf display right a half-screen. 363 */ 364 static void 365 cmd_rshift(VOID_PARAM) 366 { 367 char *s; 368 char *save_cp; 369 int cols; 370 371 /* 372 * Start at the first displayed char, count how far to the 373 * left we'd have to move to traverse a half-screen width 374 * of displayed characters. 375 */ 376 s = cmdbuf + cmd_offset; 377 cols = 0; 378 while (cols < (sc_width - prompt_col) / 2 && s > cmdbuf) 379 { 380 int width; 381 cmd_step_left(&s, &width, NULL); 382 cols += width; 383 } 384 385 cmd_offset = (int) (s - cmdbuf); 386 save_cp = cp; 387 cmd_home(); 388 cmd_repaint(save_cp); 389 } 390 391 /* 392 * Move cursor right one character. 393 */ 394 static int 395 cmd_right(VOID_PARAM) 396 { 397 char *pr; 398 char *ncp; 399 int width; 400 401 if (*cp == '\0') 402 { 403 /* Already at the end of the line. */ 404 return (CC_OK); 405 } 406 ncp = cp; 407 pr = cmd_step_right(&ncp, &width, NULL); 408 if (cmd_col + width >= sc_width) 409 cmd_lshift(); 410 else if (cmd_col + width == sc_width - 1 && cp[1] != '\0') 411 cmd_lshift(); 412 cp = ncp; 413 cmd_col += width; 414 putstr(pr); 415 while (*cp != '\0') 416 { 417 pr = cmd_step_right(&ncp, &width, NULL); 418 if (width > 0) 419 break; 420 putstr(pr); 421 cp = ncp; 422 } 423 return (CC_OK); 424 } 425 426 /* 427 * Move cursor left one character. 428 */ 429 static int 430 cmd_left(VOID_PARAM) 431 { 432 char *ncp; 433 int width = 0; 434 int bswidth = 0; 435 436 if (cp <= cmdbuf) 437 { 438 /* Already at the beginning of the line */ 439 return (CC_OK); 440 } 441 ncp = cp; 442 while (ncp > cmdbuf) 443 { 444 cmd_step_left(&ncp, &width, &bswidth); 445 if (width > 0) 446 break; 447 } 448 if (cmd_col < prompt_col + width) 449 cmd_rshift(); 450 cp = ncp; 451 cmd_col -= width; 452 while (bswidth-- > 0) 453 putbs(); 454 return (CC_OK); 455 } 456 457 /* 458 * Insert a char into the command buffer, at the current position. 459 */ 460 static int 461 cmd_ichar(cs, clen) 462 char *cs; 463 int clen; 464 { 465 char *s; 466 467 if (strlen(cmdbuf) + clen >= sizeof(cmdbuf)-1) 468 { 469 /* No room in the command buffer for another char. */ 470 bell(); 471 return (CC_ERROR); 472 } 473 474 /* 475 * Make room for the new character (shift the tail of the buffer right). 476 */ 477 for (s = &cmdbuf[strlen(cmdbuf)]; s >= cp; s--) 478 s[clen] = s[0]; 479 /* 480 * Insert the character into the buffer. 481 */ 482 for (s = cp; s < cp + clen; s++) 483 *s = *cs++; 484 /* 485 * Reprint the tail of the line from the inserted char. 486 */ 487 updown_match = -1; 488 cmd_repaint(cp); 489 cmd_right(); 490 return (CC_OK); 491 } 492 493 /* 494 * Backspace in the command buffer. 495 * Delete the char to the left of the cursor. 496 */ 497 static int 498 cmd_erase(VOID_PARAM) 499 { 500 char *s; 501 int clen; 502 503 if (cp == cmdbuf) 504 { 505 /* 506 * Backspace past beginning of the buffer: 507 * this usually means abort the command. 508 */ 509 return (CC_QUIT); 510 } 511 /* 512 * Move cursor left (to the char being erased). 513 */ 514 s = cp; 515 cmd_left(); 516 clen = (int) (s - cp); 517 518 /* 519 * Remove the char from the buffer (shift the buffer left). 520 */ 521 for (s = cp; ; s++) 522 { 523 s[0] = s[clen]; 524 if (s[0] == '\0') 525 break; 526 } 527 528 /* 529 * Repaint the buffer after the erased char. 530 */ 531 updown_match = -1; 532 cmd_repaint(cp); 533 534 /* 535 * We say that erasing the entire command string causes us 536 * to abort the current command, if CF_QUIT_ON_ERASE is set. 537 */ 538 if ((curr_cmdflags & CF_QUIT_ON_ERASE) && cp == cmdbuf && *cp == '\0') 539 return (CC_QUIT); 540 return (CC_OK); 541 } 542 543 /* 544 * Delete the char under the cursor. 545 */ 546 static int 547 cmd_delete(VOID_PARAM) 548 { 549 if (*cp == '\0') 550 { 551 /* At end of string; there is no char under the cursor. */ 552 return (CC_OK); 553 } 554 /* 555 * Move right, then use cmd_erase. 556 */ 557 cmd_right(); 558 cmd_erase(); 559 return (CC_OK); 560 } 561 562 /* 563 * Delete the "word" to the left of the cursor. 564 */ 565 static int 566 cmd_werase(VOID_PARAM) 567 { 568 if (cp > cmdbuf && cp[-1] == ' ') 569 { 570 /* 571 * If the char left of cursor is a space, 572 * erase all the spaces left of cursor (to the first non-space). 573 */ 574 while (cp > cmdbuf && cp[-1] == ' ') 575 (void) cmd_erase(); 576 } else 577 { 578 /* 579 * If the char left of cursor is not a space, 580 * erase all the nonspaces left of cursor (the whole "word"). 581 */ 582 while (cp > cmdbuf && cp[-1] != ' ') 583 (void) cmd_erase(); 584 } 585 return (CC_OK); 586 } 587 588 /* 589 * Delete the "word" under the cursor. 590 */ 591 static int 592 cmd_wdelete(VOID_PARAM) 593 { 594 if (*cp == ' ') 595 { 596 /* 597 * If the char under the cursor is a space, 598 * delete it and all the spaces right of cursor. 599 */ 600 while (*cp == ' ') 601 (void) cmd_delete(); 602 } else 603 { 604 /* 605 * If the char under the cursor is not a space, 606 * delete it and all nonspaces right of cursor (the whole word). 607 */ 608 while (*cp != ' ' && *cp != '\0') 609 (void) cmd_delete(); 610 } 611 return (CC_OK); 612 } 613 614 /* 615 * Delete all chars in the command buffer. 616 */ 617 static int 618 cmd_kill(VOID_PARAM) 619 { 620 if (cmdbuf[0] == '\0') 621 { 622 /* Buffer is already empty; abort the current command. */ 623 return (CC_QUIT); 624 } 625 cmd_offset = 0; 626 cmd_home(); 627 *cp = '\0'; 628 updown_match = -1; 629 cmd_repaint(cp); 630 631 /* 632 * We say that erasing the entire command string causes us 633 * to abort the current command, if CF_QUIT_ON_ERASE is set. 634 */ 635 if (curr_cmdflags & CF_QUIT_ON_ERASE) 636 return (CC_QUIT); 637 return (CC_OK); 638 } 639 640 /* 641 * Select an mlist structure to be the current command history. 642 */ 643 public void 644 set_mlist(mlist, cmdflags) 645 void *mlist; 646 int cmdflags; 647 { 648 #if CMD_HISTORY 649 curr_mlist = (struct mlist *) mlist; 650 curr_cmdflags = cmdflags; 651 652 /* Make sure the next up-arrow moves to the last string in the mlist. */ 653 if (curr_mlist != NULL) 654 curr_mlist->curr_mp = curr_mlist; 655 #endif 656 } 657 658 #if CMD_HISTORY 659 /* 660 * Move up or down in the currently selected command history list. 661 * Only consider entries whose first updown_match chars are equal to 662 * cmdbuf's corresponding chars. 663 */ 664 static int 665 cmd_updown(action) 666 int action; 667 { 668 constant char *s; 669 struct mlist *ml; 670 671 if (curr_mlist == NULL) 672 { 673 /* 674 * The current command has no history list. 675 */ 676 bell(); 677 return (CC_OK); 678 } 679 680 if (updown_match < 0) 681 { 682 updown_match = (int) (cp - cmdbuf); 683 } 684 685 /* 686 * Find the next history entry which matches. 687 */ 688 for (ml = curr_mlist->curr_mp;;) 689 { 690 ml = (action == EC_UP) ? ml->prev : ml->next; 691 if (ml == curr_mlist) 692 { 693 /* 694 * We reached the end (or beginning) of the list. 695 */ 696 break; 697 } 698 if (strncmp(cmdbuf, ml->string, updown_match) == 0) 699 { 700 /* 701 * This entry matches; stop here. 702 * Copy the entry into cmdbuf and echo it on the screen. 703 */ 704 curr_mlist->curr_mp = ml; 705 s = ml->string; 706 if (s == NULL) 707 s = ""; 708 cmd_offset = 0; 709 cmd_home(); 710 clear_eol(); 711 strcpy(cmdbuf, s); 712 for (cp = cmdbuf; *cp != '\0'; ) 713 cmd_right(); 714 return (CC_OK); 715 } 716 } 717 /* 718 * We didn't find a history entry that matches. 719 */ 720 bell(); 721 return (CC_OK); 722 } 723 #endif 724 725 /* 726 * 727 */ 728 static void 729 ml_link(mlist, ml) 730 struct mlist *mlist; 731 struct mlist *ml; 732 { 733 ml->next = mlist; 734 ml->prev = mlist->prev; 735 mlist->prev->next = ml; 736 mlist->prev = ml; 737 } 738 739 /* 740 * 741 */ 742 static void 743 ml_unlink(ml) 744 struct mlist *ml; 745 { 746 ml->prev->next = ml->next; 747 ml->next->prev = ml->prev; 748 } 749 750 /* 751 * Add a string to an mlist. 752 */ 753 public void 754 cmd_addhist(mlist, cmd, modified) 755 struct mlist *mlist; 756 constant char *cmd; 757 int modified; 758 { 759 #if CMD_HISTORY 760 struct mlist *ml; 761 762 /* 763 * Don't save a trivial command. 764 */ 765 if (strlen(cmd) == 0) 766 return; 767 768 if (no_hist_dups) 769 { 770 struct mlist *next = NULL; 771 for (ml = mlist->next; ml->string != NULL; ml = next) 772 { 773 next = ml->next; 774 if (strcmp(ml->string, cmd) == 0) 775 { 776 ml_unlink(ml); 777 free(ml->string); 778 free(ml); 779 } 780 } 781 } 782 783 /* 784 * Save the command unless it's a duplicate of the 785 * last command in the history. 786 */ 787 ml = mlist->prev; 788 if (ml == mlist || strcmp(ml->string, cmd) != 0) 789 { 790 /* 791 * Did not find command in history. 792 * Save the command and put it at the end of the history list. 793 */ 794 ml = (struct mlist *) ecalloc(1, sizeof(struct mlist)); 795 ml->string = save(cmd); 796 ml->modified = modified; 797 ml_link(mlist, ml); 798 } 799 /* 800 * Point to the cmd just after the just-accepted command. 801 * Thus, an UPARROW will always retrieve the previous command. 802 */ 803 mlist->curr_mp = ml->next; 804 #endif 805 } 806 807 /* 808 * Accept the command in the command buffer. 809 * Add it to the currently selected history list. 810 */ 811 public void 812 cmd_accept(VOID_PARAM) 813 { 814 #if CMD_HISTORY 815 /* 816 * Nothing to do if there is no currently selected history list. 817 */ 818 if (curr_mlist == NULL || curr_mlist == ml_examine) 819 return; 820 cmd_addhist(curr_mlist, cmdbuf, 1); 821 curr_mlist->modified = 1; 822 #endif 823 } 824 825 /* 826 * Try to perform a line-edit function on the command buffer, 827 * using a specified char as a line-editing command. 828 * Returns: 829 * CC_PASS The char does not invoke a line edit function. 830 * CC_OK Line edit function done. 831 * CC_QUIT The char requests the current command to be aborted. 832 */ 833 static int 834 cmd_edit(c) 835 int c; 836 { 837 int action; 838 int flags; 839 840 #if TAB_COMPLETE_FILENAME 841 #define not_in_completion() in_completion = 0 842 #else 843 #define not_in_completion(VOID_PARAM) 844 #endif 845 846 /* 847 * See if the char is indeed a line-editing command. 848 */ 849 flags = 0; 850 #if CMD_HISTORY 851 if (curr_mlist == NULL) 852 /* 853 * No current history; don't accept history manipulation cmds. 854 */ 855 flags |= EC_NOHISTORY; 856 #endif 857 #if TAB_COMPLETE_FILENAME 858 if (curr_mlist == ml_search) 859 /* 860 * In a search command; don't accept file-completion cmds. 861 */ 862 flags |= EC_NOCOMPLETE; 863 #endif 864 865 action = editchar(c, flags); 866 867 switch (action) 868 { 869 case EC_RIGHT: 870 not_in_completion(); 871 return (cmd_right()); 872 case EC_LEFT: 873 not_in_completion(); 874 return (cmd_left()); 875 case EC_W_RIGHT: 876 not_in_completion(); 877 while (*cp != '\0' && *cp != ' ') 878 cmd_right(); 879 while (*cp == ' ') 880 cmd_right(); 881 return (CC_OK); 882 case EC_W_LEFT: 883 not_in_completion(); 884 while (cp > cmdbuf && cp[-1] == ' ') 885 cmd_left(); 886 while (cp > cmdbuf && cp[-1] != ' ') 887 cmd_left(); 888 return (CC_OK); 889 case EC_HOME: 890 not_in_completion(); 891 cmd_offset = 0; 892 cmd_home(); 893 cmd_repaint(cp); 894 return (CC_OK); 895 case EC_END: 896 not_in_completion(); 897 while (*cp != '\0') 898 cmd_right(); 899 return (CC_OK); 900 case EC_INSERT: 901 not_in_completion(); 902 return (CC_OK); 903 case EC_BACKSPACE: 904 not_in_completion(); 905 return (cmd_erase()); 906 case EC_LINEKILL: 907 not_in_completion(); 908 return (cmd_kill()); 909 case EC_ABORT: 910 not_in_completion(); 911 (void) cmd_kill(); 912 return (CC_QUIT); 913 case EC_W_BACKSPACE: 914 not_in_completion(); 915 return (cmd_werase()); 916 case EC_DELETE: 917 not_in_completion(); 918 return (cmd_delete()); 919 case EC_W_DELETE: 920 not_in_completion(); 921 return (cmd_wdelete()); 922 case EC_LITERAL: 923 literal = 1; 924 return (CC_OK); 925 #if CMD_HISTORY 926 case EC_UP: 927 case EC_DOWN: 928 not_in_completion(); 929 return (cmd_updown(action)); 930 #endif 931 #if TAB_COMPLETE_FILENAME 932 case EC_F_COMPLETE: 933 case EC_B_COMPLETE: 934 case EC_EXPAND: 935 return (cmd_complete(action)); 936 #endif 937 case EC_NOACTION: 938 return (CC_OK); 939 default: 940 not_in_completion(); 941 return (CC_PASS); 942 } 943 } 944 945 #if TAB_COMPLETE_FILENAME 946 /* 947 * Insert a string into the command buffer, at the current position. 948 */ 949 static int 950 cmd_istr(str) 951 char *str; 952 { 953 char *s; 954 int action; 955 char *endline = str + strlen(str); 956 957 for (s = str; *s != '\0'; ) 958 { 959 char *os = s; 960 step_char(&s, +1, endline); 961 action = cmd_ichar(os, s - os); 962 if (action != CC_OK) 963 return (action); 964 } 965 return (CC_OK); 966 } 967 968 /* 969 * Find the beginning and end of the "current" word. 970 * This is the word which the cursor (cp) is inside or at the end of. 971 * Return pointer to the beginning of the word and put the 972 * cursor at the end of the word. 973 */ 974 static char * 975 delimit_word(VOID_PARAM) 976 { 977 char *word; 978 #if SPACES_IN_FILENAMES 979 char *p; 980 int delim_quoted = 0; 981 int meta_quoted = 0; 982 constant char *esc = get_meta_escape(); 983 int esclen = (int) strlen(esc); 984 #endif 985 986 /* 987 * Move cursor to end of word. 988 */ 989 if (*cp != ' ' && *cp != '\0') 990 { 991 /* 992 * Cursor is on a nonspace. 993 * Move cursor right to the next space. 994 */ 995 while (*cp != ' ' && *cp != '\0') 996 cmd_right(); 997 } else if (cp > cmdbuf && cp[-1] != ' ') 998 { 999 /* 1000 * Cursor is on a space, and char to the left is a nonspace. 1001 * We're already at the end of the word. 1002 */ 1003 ; 1004 #if 0 1005 } else 1006 { 1007 /* 1008 * Cursor is on a space and char to the left is a space. 1009 * Huh? There's no word here. 1010 */ 1011 return (NULL); 1012 #endif 1013 } 1014 /* 1015 * Find the beginning of the word which the cursor is in. 1016 */ 1017 if (cp == cmdbuf) 1018 return (NULL); 1019 #if SPACES_IN_FILENAMES 1020 /* 1021 * If we have an unbalanced quote (that is, an open quote 1022 * without a corresponding close quote), we return everything 1023 * from the open quote, including spaces. 1024 */ 1025 for (word = cmdbuf; word < cp; word++) 1026 if (*word != ' ') 1027 break; 1028 if (word >= cp) 1029 return (cp); 1030 for (p = cmdbuf; p < cp; p++) 1031 { 1032 if (meta_quoted) 1033 { 1034 meta_quoted = 0; 1035 } else if (esclen > 0 && p + esclen < cp && 1036 strncmp(p, esc, esclen) == 0) 1037 { 1038 meta_quoted = 1; 1039 p += esclen - 1; 1040 } else if (delim_quoted) 1041 { 1042 if (*p == closequote) 1043 delim_quoted = 0; 1044 } else /* (!delim_quoted) */ 1045 { 1046 if (*p == openquote) 1047 delim_quoted = 1; 1048 else if (*p == ' ') 1049 word = p+1; 1050 } 1051 } 1052 #endif 1053 return (word); 1054 } 1055 1056 /* 1057 * Set things up to enter completion mode. 1058 * Expand the word under the cursor into a list of filenames 1059 * which start with that word, and set tk_text to that list. 1060 */ 1061 static void 1062 init_compl(VOID_PARAM) 1063 { 1064 char *word; 1065 char c; 1066 1067 /* 1068 * Get rid of any previous tk_text. 1069 */ 1070 if (tk_text != NULL) 1071 { 1072 free(tk_text); 1073 tk_text = NULL; 1074 } 1075 /* 1076 * Find the original (uncompleted) word in the command buffer. 1077 */ 1078 word = delimit_word(); 1079 if (word == NULL) 1080 return; 1081 /* 1082 * Set the insertion point to the point in the command buffer 1083 * where the original (uncompleted) word now sits. 1084 */ 1085 tk_ipoint = word; 1086 /* 1087 * Save the original (uncompleted) word 1088 */ 1089 if (tk_original != NULL) 1090 free(tk_original); 1091 tk_original = (char *) ecalloc(cp-word+1, sizeof(char)); 1092 strncpy(tk_original, word, cp-word); 1093 /* 1094 * Get the expanded filename. 1095 * This may result in a single filename, or 1096 * a blank-separated list of filenames. 1097 */ 1098 c = *cp; 1099 *cp = '\0'; 1100 if (*word != openquote) 1101 { 1102 tk_text = fcomplete(word); 1103 } else 1104 { 1105 #if MSDOS_COMPILER 1106 char *qword = NULL; 1107 #else 1108 char *qword = shell_quote(word+1); 1109 #endif 1110 if (qword == NULL) 1111 tk_text = fcomplete(word+1); 1112 else 1113 { 1114 tk_text = fcomplete(qword); 1115 free(qword); 1116 } 1117 } 1118 *cp = c; 1119 } 1120 1121 /* 1122 * Return the next word in the current completion list. 1123 */ 1124 static char * 1125 next_compl(action, prev) 1126 int action; 1127 char *prev; 1128 { 1129 switch (action) 1130 { 1131 case EC_F_COMPLETE: 1132 return (forw_textlist(&tk_tlist, prev)); 1133 case EC_B_COMPLETE: 1134 return (back_textlist(&tk_tlist, prev)); 1135 } 1136 /* Cannot happen */ 1137 return ("?"); 1138 } 1139 1140 /* 1141 * Complete the filename before (or under) the cursor. 1142 * cmd_complete may be called multiple times. The global in_completion 1143 * remembers whether this call is the first time (create the list), 1144 * or a subsequent time (step thru the list). 1145 */ 1146 static int 1147 cmd_complete(action) 1148 int action; 1149 { 1150 char *s; 1151 1152 if (!in_completion || action == EC_EXPAND) 1153 { 1154 /* 1155 * Expand the word under the cursor and 1156 * use the first word in the expansion 1157 * (or the entire expansion if we're doing EC_EXPAND). 1158 */ 1159 init_compl(); 1160 if (tk_text == NULL) 1161 { 1162 bell(); 1163 return (CC_OK); 1164 } 1165 if (action == EC_EXPAND) 1166 { 1167 /* 1168 * Use the whole list. 1169 */ 1170 tk_trial = tk_text; 1171 } else 1172 { 1173 /* 1174 * Use the first filename in the list. 1175 */ 1176 in_completion = 1; 1177 init_textlist(&tk_tlist, tk_text); 1178 tk_trial = next_compl(action, (char*)NULL); 1179 } 1180 } else 1181 { 1182 /* 1183 * We already have a completion list. 1184 * Use the next/previous filename from the list. 1185 */ 1186 tk_trial = next_compl(action, tk_trial); 1187 } 1188 1189 /* 1190 * Remove the original word, or the previous trial completion. 1191 */ 1192 while (cp > tk_ipoint) 1193 (void) cmd_erase(); 1194 1195 if (tk_trial == NULL) 1196 { 1197 /* 1198 * There are no more trial completions. 1199 * Insert the original (uncompleted) filename. 1200 */ 1201 in_completion = 0; 1202 if (cmd_istr(tk_original) != CC_OK) 1203 goto fail; 1204 } else 1205 { 1206 /* 1207 * Insert trial completion. 1208 */ 1209 if (cmd_istr(tk_trial) != CC_OK) 1210 goto fail; 1211 /* 1212 * If it is a directory, append a slash. 1213 */ 1214 if (is_dir(tk_trial)) 1215 { 1216 if (cp > cmdbuf && cp[-1] == closequote) 1217 (void) cmd_erase(); 1218 s = lgetenv("LESSSEPARATOR"); 1219 if (s == NULL) 1220 s = PATHNAME_SEP; 1221 if (cmd_istr(s) != CC_OK) 1222 goto fail; 1223 } 1224 } 1225 1226 return (CC_OK); 1227 1228 fail: 1229 in_completion = 0; 1230 bell(); 1231 return (CC_OK); 1232 } 1233 1234 #endif /* TAB_COMPLETE_FILENAME */ 1235 1236 /* 1237 * Process a single character of a multi-character command, such as 1238 * a number, or the pattern of a search command. 1239 * Returns: 1240 * CC_OK The char was accepted. 1241 * CC_QUIT The char requests the command to be aborted. 1242 * CC_ERROR The char could not be accepted due to an error. 1243 */ 1244 public int 1245 cmd_char(c) 1246 int c; 1247 { 1248 int action; 1249 int len; 1250 1251 if (!utf_mode) 1252 { 1253 cmd_mbc_buf[0] = c; 1254 len = 1; 1255 } else 1256 { 1257 /* Perform strict validation in all possible cases. */ 1258 if (cmd_mbc_buf_len == 0) 1259 { 1260 retry: 1261 cmd_mbc_buf_index = 1; 1262 *cmd_mbc_buf = c; 1263 if (IS_ASCII_OCTET(c)) 1264 cmd_mbc_buf_len = 1; 1265 #if MSDOS_COMPILER || OS2 1266 else if (c == (unsigned char) '\340' && IS_ASCII_OCTET(peekcc())) 1267 { 1268 /* Assume a special key. */ 1269 cmd_mbc_buf_len = 1; 1270 } 1271 #endif 1272 else if (IS_UTF8_LEAD(c)) 1273 { 1274 cmd_mbc_buf_len = utf_len(c); 1275 return (CC_OK); 1276 } else 1277 { 1278 /* UTF8_INVALID or stray UTF8_TRAIL */ 1279 bell(); 1280 return (CC_ERROR); 1281 } 1282 } else if (IS_UTF8_TRAIL(c)) 1283 { 1284 cmd_mbc_buf[cmd_mbc_buf_index++] = c; 1285 if (cmd_mbc_buf_index < cmd_mbc_buf_len) 1286 return (CC_OK); 1287 if (!is_utf8_well_formed(cmd_mbc_buf, cmd_mbc_buf_index)) 1288 { 1289 /* complete, but not well formed (non-shortest form), sequence */ 1290 cmd_mbc_buf_len = 0; 1291 bell(); 1292 return (CC_ERROR); 1293 } 1294 } else 1295 { 1296 /* Flush incomplete (truncated) sequence. */ 1297 cmd_mbc_buf_len = 0; 1298 bell(); 1299 /* Handle new char. */ 1300 goto retry; 1301 } 1302 1303 len = cmd_mbc_buf_len; 1304 cmd_mbc_buf_len = 0; 1305 } 1306 1307 if (literal) 1308 { 1309 /* 1310 * Insert the char, even if it is a line-editing char. 1311 */ 1312 literal = 0; 1313 return (cmd_ichar(cmd_mbc_buf, len)); 1314 } 1315 1316 /* 1317 * See if it is a line-editing character. 1318 */ 1319 if (in_mca() && len == 1) 1320 { 1321 action = cmd_edit(c); 1322 switch (action) 1323 { 1324 case CC_OK: 1325 case CC_QUIT: 1326 return (action); 1327 case CC_PASS: 1328 break; 1329 } 1330 } 1331 1332 /* 1333 * Insert the char into the command buffer. 1334 */ 1335 return (cmd_ichar(cmd_mbc_buf, len)); 1336 } 1337 1338 /* 1339 * Return the number currently in the command buffer. 1340 */ 1341 public LINENUM 1342 cmd_int(frac) 1343 long *frac; 1344 { 1345 char *p; 1346 LINENUM n = 0; 1347 int err; 1348 1349 for (p = cmdbuf; *p >= '0' && *p <= '9'; p++) 1350 n = (n * 10) + (*p - '0'); 1351 *frac = 0; 1352 if (*p++ == '.') 1353 { 1354 *frac = getfraction(&p, NULL, &err); 1355 /* {{ do something if err is set? }} */ 1356 } 1357 return (n); 1358 } 1359 1360 /* 1361 * Return a pointer to the command buffer. 1362 */ 1363 public char * 1364 get_cmdbuf(VOID_PARAM) 1365 { 1366 return (cmdbuf); 1367 } 1368 1369 #if CMD_HISTORY 1370 /* 1371 * Return the last (most recent) string in the current command history. 1372 */ 1373 public char * 1374 cmd_lastpattern(VOID_PARAM) 1375 { 1376 if (curr_mlist == NULL) 1377 return (NULL); 1378 return (curr_mlist->curr_mp->prev->string); 1379 } 1380 #endif 1381 1382 #if CMD_HISTORY 1383 /* 1384 */ 1385 static int 1386 mlist_size(ml) 1387 struct mlist *ml; 1388 { 1389 int size = 0; 1390 for (ml = ml->next; ml->string != NULL; ml = ml->next) 1391 ++size; 1392 return size; 1393 } 1394 1395 /* 1396 * Get the name of the history file. 1397 */ 1398 static char * 1399 histfile_name(VOID_PARAM) 1400 { 1401 char *home; 1402 char *name; 1403 int len; 1404 1405 /* See if filename is explicitly specified by $LESSHISTFILE. */ 1406 name = lgetenv("LESSHISTFILE"); 1407 if (!isnullenv(name)) 1408 { 1409 if (strcmp(name, "-") == 0 || strcmp(name, "/dev/null") == 0) 1410 /* $LESSHISTFILE == "-" means don't use a history file. */ 1411 return (NULL); 1412 return (save(name)); 1413 } 1414 1415 /* See if history file is disabled in the build. */ 1416 if (strcmp(LESSHISTFILE, "") == 0 || strcmp(LESSHISTFILE, "-") == 0) 1417 return (NULL); 1418 1419 /* Otherwise, file is in $HOME. */ 1420 home = lgetenv("HOME"); 1421 if (isnullenv(home)) 1422 { 1423 #if OS2 1424 home = lgetenv("INIT"); 1425 if (isnullenv(home)) 1426 #endif 1427 return (NULL); 1428 } 1429 len = (int) (strlen(home) + strlen(LESSHISTFILE) + 2); 1430 name = (char *) ecalloc(len, sizeof(char)); 1431 SNPRINTF2(name, len, "%s/%s", home, LESSHISTFILE); 1432 return (name); 1433 } 1434 1435 /* 1436 * Read a .lesshst file and call a callback for each line in the file. 1437 */ 1438 static void 1439 read_cmdhist2(action, uparam, skip_search, skip_shell) 1440 void (*action)(void*,struct mlist*,char*); 1441 void *uparam; 1442 int skip_search; 1443 int skip_shell; 1444 { 1445 struct mlist *ml = NULL; 1446 char line[CMDBUF_SIZE]; 1447 char *filename; 1448 FILE *f; 1449 char *p; 1450 int *skip = NULL; 1451 1452 filename = histfile_name(); 1453 if (filename == NULL) 1454 return; 1455 f = fopen(filename, "r"); 1456 free(filename); 1457 if (f == NULL) 1458 return; 1459 if (fgets(line, sizeof(line), f) == NULL || 1460 strncmp(line, HISTFILE_FIRST_LINE, strlen(HISTFILE_FIRST_LINE)) != 0) 1461 { 1462 fclose(f); 1463 return; 1464 } 1465 while (fgets(line, sizeof(line), f) != NULL) 1466 { 1467 for (p = line; *p != '\0'; p++) 1468 { 1469 if (*p == '\n' || *p == '\r') 1470 { 1471 *p = '\0'; 1472 break; 1473 } 1474 } 1475 if (strcmp(line, HISTFILE_SEARCH_SECTION) == 0) 1476 { 1477 ml = &mlist_search; 1478 skip = &skip_search; 1479 } else if (strcmp(line, HISTFILE_SHELL_SECTION) == 0) 1480 { 1481 #if SHELL_ESCAPE || PIPEC 1482 ml = &mlist_shell; 1483 skip = &skip_shell; 1484 #else 1485 ml = NULL; 1486 skip = NULL; 1487 #endif 1488 } else if (strcmp(line, HISTFILE_MARK_SECTION) == 0) 1489 { 1490 ml = NULL; 1491 } else if (*line == '"') 1492 { 1493 if (ml != NULL) 1494 { 1495 if (skip != NULL && *skip > 0) 1496 --(*skip); 1497 else 1498 (*action)(uparam, ml, line+1); 1499 } 1500 } else if (*line == 'm') 1501 { 1502 (*action)(uparam, NULL, line); 1503 } 1504 } 1505 fclose(f); 1506 } 1507 1508 static void 1509 read_cmdhist(action, uparam, skip_search, skip_shell) 1510 void (*action)(void*,struct mlist*,char*); 1511 void *uparam; 1512 int skip_search; 1513 int skip_shell; 1514 { 1515 read_cmdhist2(action, uparam, skip_search, skip_shell); 1516 (*action)(uparam, NULL, NULL); /* signal end of file */ 1517 } 1518 1519 static void 1520 addhist_init(void *uparam, struct mlist *ml, char *string) 1521 { 1522 if (ml != NULL) 1523 cmd_addhist(ml, string, 0); 1524 else if (string != NULL) 1525 restore_mark(string); 1526 } 1527 #endif /* CMD_HISTORY */ 1528 1529 /* 1530 * Initialize history from a .lesshist file. 1531 */ 1532 public void 1533 init_cmdhist(VOID_PARAM) 1534 { 1535 #if CMD_HISTORY 1536 read_cmdhist(&addhist_init, NULL, 0, 0); 1537 #endif /* CMD_HISTORY */ 1538 } 1539 1540 /* 1541 * Write the header for a section of the history file. 1542 */ 1543 #if CMD_HISTORY 1544 static void 1545 write_mlist_header(ml, f) 1546 struct mlist *ml; 1547 FILE *f; 1548 { 1549 if (ml == &mlist_search) 1550 fprintf(f, "%s\n", HISTFILE_SEARCH_SECTION); 1551 #if SHELL_ESCAPE || PIPEC 1552 else if (ml == &mlist_shell) 1553 fprintf(f, "%s\n", HISTFILE_SHELL_SECTION); 1554 #endif 1555 } 1556 1557 /* 1558 * Write all modified entries in an mlist to the history file. 1559 */ 1560 static void 1561 write_mlist(ml, f) 1562 struct mlist *ml; 1563 FILE *f; 1564 { 1565 for (ml = ml->next; ml->string != NULL; ml = ml->next) 1566 { 1567 if (!ml->modified) 1568 continue; 1569 fprintf(f, "\"%s\n", ml->string); 1570 ml->modified = 0; 1571 } 1572 ml->modified = 0; /* entire mlist is now unmodified */ 1573 } 1574 1575 /* 1576 * Make a temp name in the same directory as filename. 1577 */ 1578 static char * 1579 make_tempname(filename) 1580 char *filename; 1581 { 1582 char lastch; 1583 char *tempname = ecalloc(1, strlen(filename)+1); 1584 strcpy(tempname, filename); 1585 lastch = tempname[strlen(tempname)-1]; 1586 tempname[strlen(tempname)-1] = (lastch == 'Q') ? 'Z' : 'Q'; 1587 return tempname; 1588 } 1589 1590 struct save_ctx 1591 { 1592 struct mlist *mlist; 1593 FILE *fout; 1594 }; 1595 1596 /* 1597 * Copy entries from the saved history file to a new file. 1598 * At the end of each mlist, append any new entries 1599 * created during this session. 1600 */ 1601 static void 1602 copy_hist(void *uparam, struct mlist *ml, char *string) 1603 { 1604 struct save_ctx *ctx = (struct save_ctx *) uparam; 1605 1606 if (ml != NULL && ml != ctx->mlist) { 1607 /* We're changing mlists. */ 1608 if (ctx->mlist) 1609 /* Append any new entries to the end of the current mlist. */ 1610 write_mlist(ctx->mlist, ctx->fout); 1611 /* Write the header for the new mlist. */ 1612 ctx->mlist = ml; 1613 write_mlist_header(ctx->mlist, ctx->fout); 1614 } 1615 1616 if (string == NULL) /* End of file */ 1617 { 1618 /* Write any sections that were not in the original file. */ 1619 if (mlist_search.modified) 1620 { 1621 write_mlist_header(&mlist_search, ctx->fout); 1622 write_mlist(&mlist_search, ctx->fout); 1623 } 1624 #if SHELL_ESCAPE || PIPEC 1625 if (mlist_shell.modified) 1626 { 1627 write_mlist_header(&mlist_shell, ctx->fout); 1628 write_mlist(&mlist_shell, ctx->fout); 1629 } 1630 #endif 1631 } else if (ml != NULL) 1632 { 1633 /* Copy mlist entry. */ 1634 fprintf(ctx->fout, "\"%s\n", string); 1635 } 1636 /* Skip marks */ 1637 } 1638 #endif /* CMD_HISTORY */ 1639 1640 /* 1641 * Make a file readable only by its owner. 1642 */ 1643 static void 1644 make_file_private(f) 1645 FILE *f; 1646 { 1647 #if HAVE_FCHMOD 1648 int do_chmod = 1; 1649 #if HAVE_STAT 1650 struct stat statbuf; 1651 int r = fstat(fileno(f), &statbuf); 1652 if (r < 0 || !S_ISREG(statbuf.st_mode)) 1653 /* Don't chmod if not a regular file. */ 1654 do_chmod = 0; 1655 #endif 1656 if (do_chmod) 1657 fchmod(fileno(f), 0600); 1658 #endif 1659 } 1660 1661 /* 1662 * Does the history file need to be updated? 1663 */ 1664 static int 1665 histfile_modified(VOID_PARAM) 1666 { 1667 if (mlist_search.modified) 1668 return 1; 1669 #if SHELL_ESCAPE || PIPEC 1670 if (mlist_shell.modified) 1671 return 1; 1672 #endif 1673 #if CMD_HISTORY 1674 if (marks_modified) 1675 return 1; 1676 #endif 1677 return 0; 1678 } 1679 1680 /* 1681 * Update the .lesshst file. 1682 */ 1683 public void 1684 save_cmdhist(VOID_PARAM) 1685 { 1686 #if CMD_HISTORY 1687 char *histname; 1688 char *tempname; 1689 int skip_search; 1690 int skip_shell; 1691 struct save_ctx ctx; 1692 char *s; 1693 FILE *fout = NULL; 1694 int histsize = 0; 1695 1696 if (!histfile_modified()) 1697 return; 1698 histname = histfile_name(); 1699 if (histname == NULL) 1700 return; 1701 tempname = make_tempname(histname); 1702 fout = fopen(tempname, "w"); 1703 if (fout != NULL) 1704 { 1705 make_file_private(fout); 1706 s = lgetenv("LESSHISTSIZE"); 1707 if (s != NULL) 1708 histsize = atoi(s); 1709 if (histsize <= 0) 1710 histsize = 100; 1711 skip_search = mlist_size(&mlist_search) - histsize; 1712 #if SHELL_ESCAPE || PIPEC 1713 skip_shell = mlist_size(&mlist_shell) - histsize; 1714 #endif 1715 fprintf(fout, "%s\n", HISTFILE_FIRST_LINE); 1716 ctx.fout = fout; 1717 ctx.mlist = NULL; 1718 read_cmdhist(©_hist, &ctx, skip_search, skip_shell); 1719 save_marks(fout, HISTFILE_MARK_SECTION); 1720 fclose(fout); 1721 #if MSDOS_COMPILER==WIN32C 1722 /* 1723 * Windows rename doesn't remove an existing file, 1724 * making it useless for atomic operations. Sigh. 1725 */ 1726 remove(histname); 1727 #endif 1728 rename(tempname, histname); 1729 } 1730 free(tempname); 1731 free(histname); 1732 #endif /* CMD_HISTORY */ 1733 } 1734