/* $Id: widget_text.c,v 1.17 2004/03/11 06:39:59 reinelt Exp $ * * simple text widget handling * * Copyright 2003,2004 Michael Reinelt * Copyright 2004 The LCD4Linux Team * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * * $Log: widget_text.c,v $ * Revision 1.17 2004/03/11 06:39:59 reinelt * big patch from Martin: * - reuse filehandles * - memory leaks fixed * - earlier busy-flag checking with HD44780 * - reuse memory for strings in RESULT and hash * - netdev_fast to wavid time-consuming regex * * Revision 1.16 2004/03/08 16:26:26 reinelt * re-introduced \nnn (octal) characters in strings * text widgets can have a 'update' speed of 0 which means 'never' * (may be used for static content) * * Revision 1.15 2004/03/06 20:31:16 reinelt * Complete rewrite of the evaluator to get rid of the code * from mark Morley (because of license issues). * The new Evaluator does a pre-compile of expressions, and * stores them in trees. Therefore it should be reasonable faster... * * Revision 1.14 2004/03/03 03:47:04 reinelt * big patch from Martin Hejl: * - use qprintf() where appropriate * - save CPU cycles on gettimeofday() * - add quit() functions to free allocated memory * - fixed lots of memory leaks * * Revision 1.13 2004/02/18 06:39:20 reinelt * T6963 driver for graphic displays finished * * Revision 1.12 2004/02/09 19:49:38 nicowallmeier * Minor bugfix * * Revision 1.11 2004/01/30 20:57:56 reinelt * HD44780 patch from Martin Hejl * dmalloc integrated * * Revision 1.10 2004/01/29 04:40:03 reinelt * every .c file includes "config.h" now * * Revision 1.9 2004/01/23 04:54:04 reinelt * icon widget added (not finished yet!) * * Revision 1.8 2004/01/22 07:57:45 reinelt * several bugs fixed where segfaulting on layout>display * Crystalfontz driver optimized, 632 display already works * * Revision 1.7 2004/01/20 04:51:39 reinelt * moved generic stuff from drv_MatrixOrbital to drv_generic * implemented new-stylish bars which are nearly finished * * Revision 1.6 2004/01/15 07:47:02 reinelt * debian/ postinst and watch added (did CVS forget about them?) * evaluator: conditional expressions (a?b:c) added * text widget nearly finished * * Revision 1.5 2004/01/15 04:29:45 reinelt * moved lcd4linux.conf.sample to *.old * lcd4linux.conf.sample with new layout * new plugins 'loadavg' and 'meminfo' * text widget have pre- and postfix * * Revision 1.4 2004/01/14 11:33:00 reinelt * new plugin 'uname' which does what it's called * text widget nearly finished * first results displayed on MatrixOrbital * * Revision 1.3 2004/01/13 08:18:20 reinelt * timer queues added * liblcd4linux deactivated turing transformation to new layout * * Revision 1.2 2004/01/11 18:26:02 reinelt * further widget and layout processing * * Revision 1.1 2004/01/10 20:22:33 reinelt * added new function 'cfg_list()' (not finished yet) * added layout.c (will replace processor.c someday) * added widget_text.c (will be the first and most important widget) * modified lcd4linux.c so that old-style configs should work, too * */ /* * exported functions: * * WIDGET_CLASS Widget_Text * a simple text widget which * must be supported by all displays * */ #include "config.h" #include #include #include #include #include "debug.h" #include "cfg.h" #include "evaluator.h" #include "timer.h" #include "widget.h" #include "widget_text.h" #ifdef WITH_DMALLOC #include #endif void widget_text_scroll (void *Self) { WIDGET *W = (WIDGET*)Self; WIDGET_TEXT *T = W->data; int num, len, width, pad; char *src, *dst; num = 0; len = strlen(T->value); width = T->width-strlen(T->preval)-strlen(T->postval); if (width<0) width=0; switch (T->align) { case ALIGN_LEFT: pad=0; break; case ALIGN_CENTER: pad=(width - len)/2; if (pad<0) pad=0; break; case ALIGN_RIGHT: pad=width - len; if (pad<0) pad=0; break; case ALIGN_MARQUEE: pad=width - T->scroll; T->scroll++; if (T->scroll >= width+len) T->scroll=0; break; default: // not reached pad=0; } dst=T->buffer; // process prefix src=T->preval; while (num < T->width) { if (*src=='\0') break; *(dst++)=*(src++); num++; } src=T->value; // pad blanks on the beginning while (pad > 0 && num < T->width) { *(dst++)=' '; num++; pad--; } // skip src chars (marquee) while (pad<0) { src++; pad++; } // copy content while (num < T->width) { if (*src=='\0') break; *(dst++)=*(src++); num++; } // pad blanks on the end src=T->postval; len=strlen(src); while (num < T->width-len) { *(dst++)=' '; num++; } // process postfix while (num < T->width) { if (*src=='\0') break; *(dst++)=*(src++); num++; } *dst='\0'; // finally, draw it! if (W->class->draw) W->class->draw(W); } void widget_text_update (void *Self) { WIDGET *W = (WIDGET*)Self; WIDGET_TEXT *T = W->data; RESULT result = {0, 0, 0, NULL}; char *preval, *postval, *value; int update; // evaluate prefix if (T->pretree!=NULL) { Eval(T->pretree, &result); preval=strdup(R2S(&result)); DelResult (&result); } else { preval=strdup(""); } // evaluate postfix if (T->posttree!=NULL) { Eval(T->posttree, &result); postval=strdup(R2S(&result)); DelResult (&result); } else { postval=strdup(""); } // evaluate expression Eval(T->tree, &result); // string or number? if (T->precision==0xC0DE) { value=strdup(R2S(&result)); } else { double number=R2N(&result); int width=T->width-strlen(preval)-strlen(postval); int precision=T->precision; // print zero bytes so we can specify NULL as target // and get the length of the resulting string int size=snprintf (NULL, 0, "%.*f", precision, number); // number does not fit into field width: try to reduce precision if (width<0) width=0; if (size>width && precision>0) { int delta=size-width; if (delta>precision) delta=precision; precision-=delta; size-=delta; // zero precision: omit decimal point, too if (precision==0) size--; } // number still doesn't fit: display '*****' if (size>width) { value=malloc(width+1); memset (value, '*', width); *(value+width)='\0'; } else { value=malloc(size+1); snprintf (value, size+1, "%.*f", precision, number); } } DelResult (&result); update=0; // prefix changed? if (T->preval == NULL || strcmp(T->preval, preval)!=0) { update=1; if (T->preval) free (T->preval); T->preval=preval; T->scroll=0; // reset marquee counter } else { free (preval); } // postfix changed? if (T->postval == NULL || strcmp(T->postval, postval)!=0) { update=1; if (T->postval) free (T->postval); T->postval=postval; T->scroll=0; // reset marquee counter } else { free (postval); } // value changed? if (T->value == NULL || strcmp(T->value, value)!=0) { update=1; if (T->value) free (T->value); T->value=value; T->scroll=0; // reset marquee counter } else { free (value); } // something has changed and should be updated if (update) { // if there's a marquee scroller active, it has its own // update callback timer, so we do nothing here; otherwise // we simply call this scroll callback directly if (T->align!=ALIGN_MARQUEE) { widget_text_scroll (Self); } } } int widget_text_init (WIDGET *Self) { char *section; char *c; WIDGET_TEXT *Text; // prepare config section // strlen("Widget:")=7 section=malloc(strlen(Self->name)+8); strcpy(section, "Widget:"); strcat(section, Self->name); Text=malloc(sizeof(WIDGET_TEXT)); memset (Text, 0, sizeof(WIDGET_TEXT)); // get raw pre- and postfix (we evaluate it ourselves) Text->prefix = cfg_get_raw (section, "prefix", NULL); Text->postfix = cfg_get_raw (section, "postfix", NULL); // compile pre- and postfix Compile (Text->prefix, &Text->pretree); Compile (Text->postfix, &Text->posttree); // get raw expression (we evaluate it ourselves) Text->expression = cfg_get_raw (section, "expression", "''"); Compile (Text->expression, &Text->tree); // field width, default 10 cfg_number (section, "width", 10, 0, 99999, &(Text->width)); // precision: number of digits after the decimal point (default: none) // Note: this is the *maximum* precision on small values, // for larger values the precision may be reduced to fit into the field width. // The default value 0xC0DE is used to distinguish between numbers and strings: // if no precision is given, the result is always treated as a string. If a // precision is specified, the result is treated as a number. cfg_number (section, "precision", 0xC0DE, 0, 80, &(Text->precision)); // field alignment: Left (default), Center, Right or Marquee c = cfg_get (section, "align", "L"); switch (toupper(*c)) { case 'L': Text->align=ALIGN_LEFT; break; case 'C': Text->align=ALIGN_CENTER; break; case 'R': Text->align=ALIGN_RIGHT; break; case 'M': Text->align=ALIGN_MARQUEE; break; default: error ("widget %s has unknown alignment '%s', using 'Left'", section, c); Text->align=ALIGN_LEFT; } free (c); // update interval (msec), default 1 sec, 0 stands for never cfg_number (section, "update", 1000, 0, 99999, &(Text->update)); // limit update interval to min 10 msec if (Text->update > 0 && Text->update < 10) Text->update = 10; // marquee scroller speed: interval (msec), default 500msec if (Text->align==ALIGN_MARQUEE) { cfg_number (section, "speed", 500, 10, 99999, &(Text->speed)); } // buffer Text->buffer=malloc(Text->width+1); free (section); Self->data=Text; // add update timer, use one-shot if 'update' is zero timer_add (widget_text_update, Self, Text->update, Text->update==0); // a marquee scroller has its own timer and callback if (Text->align==ALIGN_MARQUEE) { timer_add (widget_text_scroll, Self, Text->speed, 0); } return 0; } int widget_text_quit (WIDGET *Self) { WIDGET_TEXT *Text; if (Self) { Text=Self->data; if (Self->data) { DelTree(Text->pretree); DelTree(Text->posttree); DelTree(Text->tree); if (Text->preval) free(Text->preval); if (Text->postval) free(Text->postval); if (Text->value) free(Text->value); if (Text->buffer) free(Text->buffer); free (Self->data); Self->data=NULL; } } return 0; } WIDGET_CLASS Widget_Text = { name: "text", init: widget_text_init, draw: NULL, quit: widget_text_quit, }; 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142