1 /* 2 * Copyright (C) 1984-2019 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(); 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 { 964 bell(); 965 return (action); 966 } 967 } 968 return (CC_OK); 969 } 970 971 /* 972 * Find the beginning and end of the "current" word. 973 * This is the word which the cursor (cp) is inside or at the end of. 974 * Return pointer to the beginning of the word and put the 975 * cursor at the end of the word. 976 */ 977 static char * 978 delimit_word(VOID_PARAM) 979 { 980 char *word; 981 #if SPACES_IN_FILENAMES 982 char *p; 983 int delim_quoted = 0; 984 int meta_quoted = 0; 985 constant char *esc = get_meta_escape(); 986 int esclen = (int) strlen(esc); 987 #endif 988 989 /* 990 * Move cursor to end of word. 991 */ 992 if (*cp != ' ' && *cp != '\0') 993 { 994 /* 995 * Cursor is on a nonspace. 996 * Move cursor right to the next space. 997 */ 998 while (*cp != ' ' && *cp != '\0') 999 cmd_right(); 1000 } else if (cp > cmdbuf && cp[-1] != ' ') 1001 { 1002 /* 1003 * Cursor is on a space, and char to the left is a nonspace. 1004 * We're already at the end of the word. 1005 */ 1006 ; 1007 #if 0 1008 } else 1009 { 1010 /* 1011 * Cursor is on a space and char to the left is a space. 1012 * Huh? There's no word here. 1013 */ 1014 return (NULL); 1015 #endif 1016 } 1017 /* 1018 * Find the beginning of the word which the cursor is in. 1019 */ 1020 if (cp == cmdbuf) 1021 return (NULL); 1022 #if SPACES_IN_FILENAMES 1023 /* 1024 * If we have an unbalanced quote (that is, an open quote 1025 * without a corresponding close quote), we return everything 1026 * from the open quote, including spaces. 1027 */ 1028 for (word = cmdbuf; word < cp; word++) 1029 if (*word != ' ') 1030 break; 1031 if (word >= cp) 1032 return (cp); 1033 for (p = cmdbuf; p < cp; p++) 1034 { 1035 if (meta_quoted) 1036 { 1037 meta_quoted = 0; 1038 } else if (esclen > 0 && p + esclen < cp && 1039 strncmp(p, esc, esclen) == 0) 1040 { 1041 meta_quoted = 1; 1042 p += esclen - 1; 1043 } else if (delim_quoted) 1044 { 1045 if (*p == closequote) 1046 delim_quoted = 0; 1047 } else /* (!delim_quoted) */ 1048 { 1049 if (*p == openquote) 1050 delim_quoted = 1; 1051 else if (*p == ' ') 1052 word = p+1; 1053 } 1054 } 1055 #endif 1056 return (word); 1057 } 1058 1059 /* 1060 * Set things up to enter completion mode. 1061 * Expand the word under the cursor into a list of filenames 1062 * which start with that word, and set tk_text to that list. 1063 */ 1064 static void 1065 init_compl(VOID_PARAM) 1066 { 1067 char *word; 1068 char c; 1069 1070 /* 1071 * Get rid of any previous tk_text. 1072 */ 1073 if (tk_text != NULL) 1074 { 1075 free(tk_text); 1076 tk_text = NULL; 1077 } 1078 /* 1079 * Find the original (uncompleted) word in the command buffer. 1080 */ 1081 word = delimit_word(); 1082 if (word == NULL) 1083 return; 1084 /* 1085 * Set the insertion point to the point in the command buffer 1086 * where the original (uncompleted) word now sits. 1087 */ 1088 tk_ipoint = word; 1089 /* 1090 * Save the original (uncompleted) word 1091 */ 1092 if (tk_original != NULL) 1093 free(tk_original); 1094 tk_original = (char *) ecalloc(cp-word+1, sizeof(char)); 1095 strncpy(tk_original, word, cp-word); 1096 /* 1097 * Get the expanded filename. 1098 * This may result in a single filename, or 1099 * a blank-separated list of filenames. 1100 */ 1101 c = *cp; 1102 *cp = '\0'; 1103 if (*word != openquote) 1104 { 1105 tk_text = fcomplete(word); 1106 } else 1107 { 1108 #if MSDOS_COMPILER 1109 char *qword = NULL; 1110 #else 1111 char *qword = shell_quote(word+1); 1112 #endif 1113 if (qword == NULL) 1114 tk_text = fcomplete(word+1); 1115 else 1116 { 1117 tk_text = fcomplete(qword); 1118 free(qword); 1119 } 1120 } 1121 *cp = c; 1122 } 1123 1124 /* 1125 * Return the next word in the current completion list. 1126 */ 1127 static char * 1128 next_compl(action, prev) 1129 int action; 1130 char *prev; 1131 { 1132 switch (action) 1133 { 1134 case EC_F_COMPLETE: 1135 return (forw_textlist(&tk_tlist, prev)); 1136 case EC_B_COMPLETE: 1137 return (back_textlist(&tk_tlist, prev)); 1138 } 1139 /* Cannot happen */ 1140 return ("?"); 1141 } 1142 1143 /* 1144 * Complete the filename before (or under) the cursor. 1145 * cmd_complete may be called multiple times. The global in_completion 1146 * remembers whether this call is the first time (create the list), 1147 * or a subsequent time (step thru the list). 1148 */ 1149 static int 1150 cmd_complete(action) 1151 int action; 1152 { 1153 char *s; 1154 1155 if (!in_completion || action == EC_EXPAND) 1156 { 1157 /* 1158 * Expand the word under the cursor and 1159 * use the first word in the expansion 1160 * (or the entire expansion if we're doing EC_EXPAND). 1161 */ 1162 init_compl(); 1163 if (tk_text == NULL) 1164 { 1165 bell(); 1166 return (CC_OK); 1167 } 1168 if (action == EC_EXPAND) 1169 { 1170 /* 1171 * Use the whole list. 1172 */ 1173 tk_trial = tk_text; 1174 } else 1175 { 1176 /* 1177 * Use the first filename in the list. 1178 */ 1179 in_completion = 1; 1180 init_textlist(&tk_tlist, tk_text); 1181 tk_trial = next_compl(action, (char*)NULL); 1182 } 1183 } else 1184 { 1185 /* 1186 * We already have a completion list. 1187 * Use the next/previous filename from the list. 1188 */ 1189 tk_trial = next_compl(action, tk_trial); 1190 } 1191 1192 /* 1193 * Remove the original word, or the previous trial completion. 1194 */ 1195 while (cp > tk_ipoint) 1196 (void) cmd_erase(); 1197 1198 if (tk_trial == NULL) 1199 { 1200 /* 1201 * There are no more trial completions. 1202 * Insert the original (uncompleted) filename. 1203 */ 1204 in_completion = 0; 1205 if (cmd_istr(tk_original) != CC_OK) 1206 goto fail; 1207 } else 1208 { 1209 /* 1210 * Insert trial completion. 1211 */ 1212 if (cmd_istr(tk_trial) != CC_OK) 1213 goto fail; 1214 /* 1215 * If it is a directory, append a slash. 1216 */ 1217 if (is_dir(tk_trial)) 1218 { 1219 if (cp > cmdbuf && cp[-1] == closequote) 1220 (void) cmd_erase(); 1221 s = lgetenv("LESSSEPARATOR"); 1222 if (s == NULL) 1223 s = PATHNAME_SEP; 1224 if (cmd_istr(s) != CC_OK) 1225 goto fail; 1226 } 1227 } 1228 1229 return (CC_OK); 1230 1231 fail: 1232 in_completion = 0; 1233 bell(); 1234 return (CC_OK); 1235 } 1236 1237 #endif /* TAB_COMPLETE_FILENAME */ 1238 1239 /* 1240 * Process a single character of a multi-character command, such as 1241 * a number, or the pattern of a search command. 1242 * Returns: 1243 * CC_OK The char was accepted. 1244 * CC_QUIT The char requests the command to be aborted. 1245 * CC_ERROR The char could not be accepted due to an error. 1246 */ 1247 public int 1248 cmd_char(c) 1249 int c; 1250 { 1251 int action; 1252 int len; 1253 1254 if (!utf_mode) 1255 { 1256 cmd_mbc_buf[0] = c; 1257 len = 1; 1258 } else 1259 { 1260 /* Perform strict validation in all possible cases. */ 1261 if (cmd_mbc_buf_len == 0) 1262 { 1263 retry: 1264 cmd_mbc_buf_index = 1; 1265 *cmd_mbc_buf = c; 1266 if (IS_ASCII_OCTET(c)) 1267 cmd_mbc_buf_len = 1; 1268 #if MSDOS_COMPILER || OS2 1269 else if (c == (unsigned char) '\340' && IS_ASCII_OCTET(peekcc())) 1270 { 1271 /* Assume a special key. */ 1272 cmd_mbc_buf_len = 1; 1273 } 1274 #endif 1275 else if (IS_UTF8_LEAD(c)) 1276 { 1277 cmd_mbc_buf_len = utf_len(c); 1278 return (CC_OK); 1279 } else 1280 { 1281 /* UTF8_INVALID or stray UTF8_TRAIL */ 1282 bell(); 1283 return (CC_ERROR); 1284 } 1285 } else if (IS_UTF8_TRAIL(c)) 1286 { 1287 cmd_mbc_buf[cmd_mbc_buf_index++] = c; 1288 if (cmd_mbc_buf_index < cmd_mbc_buf_len) 1289 return (CC_OK); 1290 if (!is_utf8_well_formed(cmd_mbc_buf, cmd_mbc_buf_index)) 1291 { 1292 /* complete, but not well formed (non-shortest form), sequence */ 1293 cmd_mbc_buf_len = 0; 1294 bell(); 1295 return (CC_ERROR); 1296 } 1297 } else 1298 { 1299 /* Flush incomplete (truncated) sequence. */ 1300 cmd_mbc_buf_len = 0; 1301 bell(); 1302 /* Handle new char. */ 1303 goto retry; 1304 } 1305 1306 len = cmd_mbc_buf_len; 1307 cmd_mbc_buf_len = 0; 1308 } 1309 1310 if (literal) 1311 { 1312 /* 1313 * Insert the char, even if it is a line-editing char. 1314 */ 1315 literal = 0; 1316 return (cmd_ichar(cmd_mbc_buf, len)); 1317 } 1318 1319 /* 1320 * See if it is a line-editing character. 1321 */ 1322 if (in_mca() && len == 1) 1323 { 1324 action = cmd_edit(c); 1325 switch (action) 1326 { 1327 case CC_OK: 1328 case CC_QUIT: 1329 return (action); 1330 case CC_PASS: 1331 break; 1332 } 1333 } 1334 1335 /* 1336 * Insert the char into the command buffer. 1337 */ 1338 return (cmd_ichar(cmd_mbc_buf, len)); 1339 } 1340 1341 /* 1342 * Return the number currently in the command buffer. 1343 */ 1344 public LINENUM 1345 cmd_int(frac) 1346 long *frac; 1347 { 1348 char *p; 1349 LINENUM n = 0; 1350 int err; 1351 1352 for (p = cmdbuf; *p >= '0' && *p <= '9'; p++) 1353 n = (n * 10) + (*p - '0'); 1354 *frac = 0; 1355 if (*p++ == '.') 1356 { 1357 *frac = getfraction(&p, NULL, &err); 1358 /* {{ do something if err is set? }} */ 1359 } 1360 return (n); 1361 } 1362 1363 /* 1364 * Return a pointer to the command buffer. 1365 */ 1366 public char * 1367 get_cmdbuf(VOID_PARAM) 1368 { 1369 return (cmdbuf); 1370 } 1371 1372 #if CMD_HISTORY 1373 /* 1374 * Return the last (most recent) string in the current command history. 1375 */ 1376 public char * 1377 cmd_lastpattern(VOID_PARAM) 1378 { 1379 if (curr_mlist == NULL) 1380 return (NULL); 1381 return (curr_mlist->curr_mp->prev->string); 1382 } 1383 #endif 1384 1385 #if CMD_HISTORY 1386 /* 1387 */ 1388 static int 1389 mlist_size(ml) 1390 struct mlist *ml; 1391 { 1392 int size = 0; 1393 for (ml = ml->next; ml->string != NULL; ml = ml->next) 1394 ++size; 1395 return size; 1396 } 1397 1398 /* 1399 * Get the name of the history file. 1400 */ 1401 static char * 1402 histfile_name(VOID_PARAM) 1403 { 1404 char *home; 1405 char *name; 1406 int len; 1407 1408 /* See if filename is explicitly specified by $LESSHISTFILE. */ 1409 name = lgetenv("LESSHISTFILE"); 1410 if (!isnullenv(name)) 1411 { 1412 if (strcmp(name, "-") == 0 || strcmp(name, "/dev/null") == 0) 1413 /* $LESSHISTFILE == "-" means don't use a history file. */ 1414 return (NULL); 1415 return (save(name)); 1416 } 1417 1418 /* See if history file is disabled in the build. */ 1419 if (strcmp(LESSHISTFILE, "") == 0 || strcmp(LESSHISTFILE, "-") == 0) 1420 return (NULL); 1421 1422 /* Otherwise, file is in $HOME. */ 1423 home = lgetenv("HOME"); 1424 if (isnullenv(home)) 1425 { 1426 #if OS2 1427 home = lgetenv("INIT"); 1428 if (isnullenv(home)) 1429 #endif 1430 return (NULL); 1431 } 1432 len = (int) (strlen(home) + strlen(LESSHISTFILE) + 2); 1433 name = (char *) ecalloc(len, sizeof(char)); 1434 SNPRINTF2(name, len, "%s/%s", home, LESSHISTFILE); 1435 return (name); 1436 } 1437 1438 /* 1439 * Read a .lesshst file and call a callback for each line in the file. 1440 */ 1441 static void 1442 read_cmdhist2(action, uparam, skip_search, skip_shell) 1443 void (*action)(void*,struct mlist*,char*); 1444 void *uparam; 1445 int skip_search; 1446 int skip_shell; 1447 { 1448 struct mlist *ml = NULL; 1449 char line[CMDBUF_SIZE]; 1450 char *filename; 1451 FILE *f; 1452 char *p; 1453 int *skip = NULL; 1454 1455 filename = histfile_name(); 1456 if (filename == NULL) 1457 return; 1458 f = fopen(filename, "r"); 1459 free(filename); 1460 if (f == NULL) 1461 return; 1462 if (fgets(line, sizeof(line), f) == NULL || 1463 strncmp(line, HISTFILE_FIRST_LINE, strlen(HISTFILE_FIRST_LINE)) != 0) 1464 { 1465 fclose(f); 1466 return; 1467 } 1468 while (fgets(line, sizeof(line), f) != NULL) 1469 { 1470 for (p = line; *p != '\0'; p++) 1471 { 1472 if (*p == '\n' || *p == '\r') 1473 { 1474 *p = '\0'; 1475 break; 1476 } 1477 } 1478 if (strcmp(line, HISTFILE_SEARCH_SECTION) == 0) 1479 { 1480 ml = &mlist_search; 1481 skip = &skip_search; 1482 } else if (strcmp(line, HISTFILE_SHELL_SECTION) == 0) 1483 { 1484 #if SHELL_ESCAPE || PIPEC 1485 ml = &mlist_shell; 1486 skip = &skip_shell; 1487 #else 1488 ml = NULL; 1489 skip = NULL; 1490 #endif 1491 } else if (strcmp(line, HISTFILE_MARK_SECTION) == 0) 1492 { 1493 ml = NULL; 1494 } else if (*line == '"') 1495 { 1496 if (ml != NULL) 1497 { 1498 if (skip != NULL && *skip > 0) 1499 --(*skip); 1500 else 1501 (*action)(uparam, ml, line+1); 1502 } 1503 } else if (*line == 'm') 1504 { 1505 (*action)(uparam, NULL, line); 1506 } 1507 } 1508 fclose(f); 1509 } 1510 1511 static void 1512 read_cmdhist(action, uparam, skip_search, skip_shell) 1513 void (*action)(void*,struct mlist*,char*); 1514 void *uparam; 1515 int skip_search; 1516 int skip_shell; 1517 { 1518 read_cmdhist2(action, uparam, skip_search, skip_shell); 1519 (*action)(uparam, NULL, NULL); /* signal end of file */ 1520 } 1521 1522 static void 1523 addhist_init(void *uparam, struct mlist *ml, char *string) 1524 { 1525 if (ml != NULL) 1526 cmd_addhist(ml, string, 0); 1527 else if (string != NULL) 1528 restore_mark(string); 1529 } 1530 #endif /* CMD_HISTORY */ 1531 1532 /* 1533 * Initialize history from a .lesshist file. 1534 */ 1535 public void 1536 init_cmdhist(VOID_PARAM) 1537 { 1538 #if CMD_HISTORY 1539 read_cmdhist(&addhist_init, NULL, 0, 0); 1540 #endif /* CMD_HISTORY */ 1541 } 1542 1543 /* 1544 * Write the header for a section of the history file. 1545 */ 1546 #if CMD_HISTORY 1547 static void 1548 write_mlist_header(ml, f) 1549 struct mlist *ml; 1550 FILE *f; 1551 { 1552 if (ml == &mlist_search) 1553 fprintf(f, "%s\n", HISTFILE_SEARCH_SECTION); 1554 #if SHELL_ESCAPE || PIPEC 1555 else if (ml == &mlist_shell) 1556 fprintf(f, "%s\n", HISTFILE_SHELL_SECTION); 1557 #endif 1558 } 1559 1560 /* 1561 * Write all modified entries in an mlist to the history file. 1562 */ 1563 static void 1564 write_mlist(ml, f) 1565 struct mlist *ml; 1566 FILE *f; 1567 { 1568 for (ml = ml->next; ml->string != NULL; ml = ml->next) 1569 { 1570 if (!ml->modified) 1571 continue; 1572 fprintf(f, "\"%s\n", ml->string); 1573 ml->modified = 0; 1574 } 1575 ml->modified = 0; /* entire mlist is now unmodified */ 1576 } 1577 1578 /* 1579 * Make a temp name in the same directory as filename. 1580 */ 1581 static char * 1582 make_tempname(filename) 1583 char *filename; 1584 { 1585 char lastch; 1586 char *tempname = ecalloc(1, strlen(filename)+1); 1587 strcpy(tempname, filename); 1588 lastch = tempname[strlen(tempname)-1]; 1589 tempname[strlen(tempname)-1] = (lastch == 'Q') ? 'Z' : 'Q'; 1590 return tempname; 1591 } 1592 1593 struct save_ctx 1594 { 1595 struct mlist *mlist; 1596 FILE *fout; 1597 }; 1598 1599 /* 1600 * Copy entries from the saved history file to a new file. 1601 * At the end of each mlist, append any new entries 1602 * created during this session. 1603 */ 1604 static void 1605 copy_hist(void *uparam, struct mlist *ml, char *string) 1606 { 1607 struct save_ctx *ctx = (struct save_ctx *) uparam; 1608 1609 if (ml != NULL && ml != ctx->mlist) { 1610 /* We're changing mlists. */ 1611 if (ctx->mlist) 1612 /* Append any new entries to the end of the current mlist. */ 1613 write_mlist(ctx->mlist, ctx->fout); 1614 /* Write the header for the new mlist. */ 1615 ctx->mlist = ml; 1616 write_mlist_header(ctx->mlist, ctx->fout); 1617 } 1618 1619 if (string == NULL) /* End of file */ 1620 { 1621 /* Write any sections that were not in the original file. */ 1622 if (mlist_search.modified) 1623 { 1624 write_mlist_header(&mlist_search, ctx->fout); 1625 write_mlist(&mlist_search, ctx->fout); 1626 } 1627 #if SHELL_ESCAPE || PIPEC 1628 if (mlist_shell.modified) 1629 { 1630 write_mlist_header(&mlist_shell, ctx->fout); 1631 write_mlist(&mlist_shell, ctx->fout); 1632 } 1633 #endif 1634 } else if (ml != NULL) 1635 { 1636 /* Copy mlist entry. */ 1637 fprintf(ctx->fout, "\"%s\n", string); 1638 } 1639 /* Skip marks */ 1640 } 1641 #endif /* CMD_HISTORY */ 1642 1643 /* 1644 * Make a file readable only by its owner. 1645 */ 1646 static void 1647 make_file_private(f) 1648 FILE *f; 1649 { 1650 #if HAVE_FCHMOD 1651 int do_chmod = 1; 1652 #if HAVE_STAT 1653 struct stat statbuf; 1654 int r = fstat(fileno(f), &statbuf); 1655 if (r < 0 || !S_ISREG(statbuf.st_mode)) 1656 /* Don't chmod if not a regular file. */ 1657 do_chmod = 0; 1658 #endif 1659 if (do_chmod) 1660 fchmod(fileno(f), 0600); 1661 #endif 1662 } 1663 1664 /* 1665 * Does the history file need to be updated? 1666 */ 1667 static int 1668 histfile_modified(VOID_PARAM) 1669 { 1670 if (mlist_search.modified) 1671 return 1; 1672 #if SHELL_ESCAPE || PIPEC 1673 if (mlist_shell.modified) 1674 return 1; 1675 #endif 1676 #if CMD_HISTORY 1677 if (marks_modified) 1678 return 1; 1679 #endif 1680 return 0; 1681 } 1682 1683 /* 1684 * Update the .lesshst file. 1685 */ 1686 public void 1687 save_cmdhist(VOID_PARAM) 1688 { 1689 #if CMD_HISTORY 1690 char *histname; 1691 char *tempname; 1692 int skip_search; 1693 int skip_shell; 1694 struct save_ctx ctx; 1695 char *s; 1696 FILE *fout = NULL; 1697 int histsize = 0; 1698 1699 if (!histfile_modified()) 1700 return; 1701 histname = histfile_name(); 1702 if (histname == NULL) 1703 return; 1704 tempname = make_tempname(histname); 1705 fout = fopen(tempname, "w"); 1706 if (fout != NULL) 1707 { 1708 make_file_private(fout); 1709 s = lgetenv("LESSHISTSIZE"); 1710 if (s != NULL) 1711 histsize = atoi(s); 1712 if (histsize <= 0) 1713 histsize = 100; 1714 skip_search = mlist_size(&mlist_search) - histsize; 1715 #if SHELL_ESCAPE || PIPEC 1716 skip_shell = mlist_size(&mlist_shell) - histsize; 1717 #endif 1718 fprintf(fout, "%s\n", HISTFILE_FIRST_LINE); 1719 ctx.fout = fout; 1720 ctx.mlist = NULL; 1721 read_cmdhist(©_hist, &ctx, skip_search, skip_shell); 1722 save_marks(fout, HISTFILE_MARK_SECTION); 1723 fclose(fout); 1724 #if MSDOS_COMPILER==WIN32C 1725 /* 1726 * Windows rename doesn't remove an existing file, 1727 * making it useless for atomic operations. Sigh. 1728 */ 1729 remove(histname); 1730 #endif 1731 rename(tempname, histname); 1732 } 1733 free(tempname); 1734 free(histname); 1735 #endif /* CMD_HISTORY */ 1736 } 1737