display.c revision 101692
1/* 2 * Top users/processes display for Unix 3 * Version 3 4 * 5 * This program may be freely redistributed, 6 * but this entire comment MUST remain intact. 7 * 8 * Copyright (c) 1984, 1989, William LeFebvre, Rice University 9 * Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University 10 * 11 * $FreeBSD: head/contrib/top/display.c 101692 2002-08-11 18:37:25Z dwmalone $ 12 */ 13 14/* 15 * This file contains the routines that display information on the screen. 16 * Each section of the screen has two routines: one for initially writing 17 * all constant and dynamic text, and one for only updating the text that 18 * changes. The prefix "i_" is used on all the "initial" routines and the 19 * prefix "u_" is used for all the "updating" routines. 20 * 21 * ASSUMPTIONS: 22 * None of the "i_" routines use any of the termcap capabilities. 23 * In this way, those routines can be safely used on terminals that 24 * have minimal (or nonexistant) terminal capabilities. 25 * 26 * The routines are called in this order: *_loadave, i_timeofday, 27 * *_procstates, *_cpustates, *_memory, *_message, *_header, 28 * *_process, u_endscreen. 29 */ 30 31#include "os.h" 32#include <ctype.h> 33#include <time.h> 34#include <sys/time.h> 35 36#include "screen.h" /* interface to screen package */ 37#include "layout.h" /* defines for screen position layout */ 38#include "display.h" 39#include "top.h" 40#include "top.local.h" 41#include "boolean.h" 42#include "machine.h" /* we should eliminate this!!! */ 43#include "utils.h" 44 45#ifdef DEBUG 46FILE *debug; 47#endif 48 49/* imported from screen.c */ 50extern int overstrike; 51 52static int lmpid = 0; 53static int last_hi = 0; /* used in u_process and u_endscreen */ 54static int lastline = 0; 55static int display_width = MAX_COLS; 56 57#define lineindex(l) ((l)*display_width) 58 59char *printable(); 60 61/* things initialized by display_init and used thruout */ 62 63/* buffer of proc information lines for display updating */ 64char *screenbuf = NULL; 65 66static char **procstate_names; 67static char **cpustate_names; 68static char **memory_names; 69static char **swap_names; 70 71static int num_procstates; 72static int num_cpustates; 73static int num_memory; 74static int num_swap; 75 76static int *lprocstates; 77static int *lcpustates; 78static int *lmemory; 79static int *lswap; 80 81static int *cpustate_columns; 82static int cpustate_total_length; 83 84static enum { OFF, ON, ERASE } header_status = ON; 85 86static int string_count(); 87static void summary_format(); 88static void line_update(); 89 90int display_resize() 91 92{ 93 register int lines; 94 95 /* first, deallocate any previous buffer that may have been there */ 96 if (screenbuf != NULL) 97 { 98 free(screenbuf); 99 } 100 101 /* calculate the current dimensions */ 102 /* if operating in "dumb" mode, we only need one line */ 103 lines = smart_terminal ? screen_length - Header_lines : 1; 104 105 if (lines < 0) 106 lines = 0; 107 /* we don't want more than MAX_COLS columns, since the machine-dependent 108 modules make static allocations based on MAX_COLS and we don't want 109 to run off the end of their buffers */ 110 display_width = screen_width; 111 if (display_width >= MAX_COLS) 112 { 113 display_width = MAX_COLS - 1; 114 } 115 116 /* now, allocate space for the screen buffer */ 117 screenbuf = (char *)malloc(lines * display_width); 118 if (screenbuf == (char *)NULL) 119 { 120 /* oops! */ 121 return(-1); 122 } 123 124 /* return number of lines available */ 125 /* for dumb terminals, pretend like we can show any amount */ 126 return(smart_terminal ? lines : Largest); 127} 128 129int display_init(statics) 130 131struct statics *statics; 132 133{ 134 register int lines; 135 register char **pp; 136 register int *ip; 137 register int i; 138 139 /* call resize to do the dirty work */ 140 lines = display_resize(); 141 142 /* only do the rest if we need to */ 143 if (lines > -1) 144 { 145 /* save pointers and allocate space for names */ 146 procstate_names = statics->procstate_names; 147 num_procstates = string_count(procstate_names); 148 lprocstates = (int *)malloc(num_procstates * sizeof(int)); 149 150 cpustate_names = statics->cpustate_names; 151 152 swap_names = statics->swap_names; 153 num_swap = string_count(swap_names); 154 lswap = (int *)malloc(num_swap * sizeof(int)); 155 num_cpustates = string_count(cpustate_names); 156 lcpustates = (int *)malloc(num_cpustates * sizeof(int)); 157 cpustate_columns = (int *)malloc(num_cpustates * sizeof(int)); 158 159 memory_names = statics->memory_names; 160 num_memory = string_count(memory_names); 161 lmemory = (int *)malloc(num_memory * sizeof(int)); 162 163 /* calculate starting columns where needed */ 164 cpustate_total_length = 0; 165 pp = cpustate_names; 166 ip = cpustate_columns; 167 while (*pp != NULL) 168 { 169 *ip++ = cpustate_total_length; 170 if ((i = strlen(*pp++)) > 0) 171 { 172 cpustate_total_length += i + 8; 173 } 174 } 175 } 176 177 /* return number of lines available */ 178 return(lines); 179} 180 181i_loadave(mpid, avenrun) 182 183int mpid; 184double *avenrun; 185 186{ 187 register int i; 188 189 /* i_loadave also clears the screen, since it is first */ 190 clear(); 191 192 /* mpid == -1 implies this system doesn't have an _mpid */ 193 if (mpid != -1) 194 { 195 printf("last pid: %5d; ", mpid); 196 } 197 198 printf("load averages"); 199 200 for (i = 0; i < 3; i++) 201 { 202 printf("%c %5.2f", 203 i == 0 ? ':' : ',', 204 avenrun[i]); 205 } 206 lmpid = mpid; 207} 208 209u_loadave(mpid, avenrun) 210 211int mpid; 212double *avenrun; 213 214{ 215 register int i; 216 217 if (mpid != -1) 218 { 219 /* change screen only when value has really changed */ 220 if (mpid != lmpid) 221 { 222 Move_to(x_lastpid, y_lastpid); 223 printf("%5d", mpid); 224 lmpid = mpid; 225 } 226 227 /* i remembers x coordinate to move to */ 228 i = x_loadave; 229 } 230 else 231 { 232 i = x_loadave_nompid; 233 } 234 235 /* move into position for load averages */ 236 Move_to(i, y_loadave); 237 238 /* display new load averages */ 239 /* we should optimize this and only display changes */ 240 for (i = 0; i < 3; i++) 241 { 242 printf("%s%5.2f", 243 i == 0 ? "" : ", ", 244 avenrun[i]); 245 } 246} 247 248i_timeofday(tod) 249 250time_t *tod; 251 252{ 253 /* 254 * Display the current time. 255 * "ctime" always returns a string that looks like this: 256 * 257 * Sun Sep 16 01:03:52 1973 258 * 012345678901234567890123 259 * 1 2 260 * 261 * We want indices 11 thru 18 (length 8). 262 */ 263 264 if (smart_terminal) 265 { 266 Move_to(screen_width - 8, 0); 267 } 268 else 269 { 270 fputs(" ", stdout); 271 } 272#ifdef DEBUG 273 { 274 char *foo; 275 foo = ctime(tod); 276 fputs(foo, stdout); 277 } 278#endif 279 printf("%-8.8s\n", &(ctime(tod)[11])); 280 lastline = 1; 281} 282 283static int ltotal = 0; 284static char procstates_buffer[MAX_COLS]; 285 286/* 287 * *_procstates(total, brkdn, names) - print the process summary line 288 * 289 * Assumptions: cursor is at the beginning of the line on entry 290 * lastline is valid 291 */ 292 293i_procstates(total, brkdn) 294 295int total; 296int *brkdn; 297 298{ 299 register int i; 300 301 /* write current number of processes and remember the value */ 302 printf("%d processes:", total); 303 ltotal = total; 304 305 /* put out enough spaces to get to column 15 */ 306 i = digits(total); 307 while (i++ < 4) 308 { 309 putchar(' '); 310 } 311 312 /* format and print the process state summary */ 313 summary_format(procstates_buffer, brkdn, procstate_names); 314 fputs(procstates_buffer, stdout); 315 316 /* save the numbers for next time */ 317 memcpy(lprocstates, brkdn, num_procstates * sizeof(int)); 318} 319 320u_procstates(total, brkdn) 321 322int total; 323int *brkdn; 324 325{ 326 static char new[MAX_COLS]; 327 register int i; 328 329 /* update number of processes only if it has changed */ 330 if (ltotal != total) 331 { 332 /* move and overwrite */ 333#if (x_procstate == 0) 334 Move_to(x_procstate, y_procstate); 335#else 336 /* cursor is already there...no motion needed */ 337 /* assert(lastline == 1); */ 338#endif 339 printf("%d", total); 340 341 /* if number of digits differs, rewrite the label */ 342 if (digits(total) != digits(ltotal)) 343 { 344 fputs(" processes:", stdout); 345 /* put out enough spaces to get to column 15 */ 346 i = digits(total); 347 while (i++ < 4) 348 { 349 putchar(' '); 350 } 351 /* cursor may end up right where we want it!!! */ 352 } 353 354 /* save new total */ 355 ltotal = total; 356 } 357 358 /* see if any of the state numbers has changed */ 359 if (memcmp(lprocstates, brkdn, num_procstates * sizeof(int)) != 0) 360 { 361 /* format and update the line */ 362 summary_format(new, brkdn, procstate_names); 363 line_update(procstates_buffer, new, x_brkdn, y_brkdn); 364 memcpy(lprocstates, brkdn, num_procstates * sizeof(int)); 365 } 366} 367 368/* 369 * *_cpustates(states, names) - print the cpu state percentages 370 * 371 * Assumptions: cursor is on the PREVIOUS line 372 */ 373 374static int cpustates_column; 375 376/* cpustates_tag() calculates the correct tag to use to label the line */ 377 378char *cpustates_tag() 379 380{ 381 register char *use; 382 383 static char *short_tag = "CPU: "; 384 static char *long_tag = "CPU states: "; 385 386 /* if length + strlen(long_tag) >= screen_width, then we have to 387 use the shorter tag (we subtract 2 to account for ": ") */ 388 if (cpustate_total_length + (int)strlen(long_tag) - 2 >= screen_width) 389 { 390 use = short_tag; 391 } 392 else 393 { 394 use = long_tag; 395 } 396 397 /* set cpustates_column accordingly then return result */ 398 cpustates_column = strlen(use); 399 return(use); 400} 401 402i_cpustates(states) 403 404register int *states; 405 406{ 407 register int i = 0; 408 register int value; 409 register char **names = cpustate_names; 410 register char *thisname; 411 412 /* print tag and bump lastline */ 413 printf("\n%s", cpustates_tag()); 414 lastline++; 415 416 /* now walk thru the names and print the line */ 417 while ((thisname = *names++) != NULL) 418 { 419 if (*thisname != '\0') 420 { 421 /* retrieve the value and remember it */ 422 value = *states++; 423 424 /* if percentage is >= 1000, print it as 100% */ 425 printf((value >= 1000 ? "%s%4.0f%% %s" : "%s%4.1f%% %s"), 426 i++ == 0 ? "" : ", ", 427 ((float)value)/10., 428 thisname); 429 } 430 } 431 432 /* copy over values into "last" array */ 433 memcpy(lcpustates, states, num_cpustates * sizeof(int)); 434} 435 436u_cpustates(states) 437 438register int *states; 439 440{ 441 register int value; 442 register char **names = cpustate_names; 443 register char *thisname; 444 register int *lp; 445 register int *colp; 446 447 Move_to(cpustates_column, y_cpustates); 448 lastline = y_cpustates; 449 lp = lcpustates; 450 colp = cpustate_columns; 451 452 /* we could be much more optimal about this */ 453 while ((thisname = *names++) != NULL) 454 { 455 if (*thisname != '\0') 456 { 457 /* did the value change since last time? */ 458 if (*lp != *states) 459 { 460 /* yes, move and change */ 461 Move_to(cpustates_column + *colp, y_cpustates); 462 lastline = y_cpustates; 463 464 /* retrieve value and remember it */ 465 value = *states; 466 467 /* if percentage is >= 1000, print it as 100% */ 468 printf((value >= 1000 ? "%4.0f" : "%4.1f"), 469 ((double)value)/10.); 470 471 /* remember it for next time */ 472 *lp = value; 473 } 474 } 475 476 /* increment and move on */ 477 lp++; 478 states++; 479 colp++; 480 } 481} 482 483z_cpustates() 484 485{ 486 register int i = 0; 487 register char **names = cpustate_names; 488 register char *thisname; 489 register int *lp; 490 491 /* show tag and bump lastline */ 492 printf("\n%s", cpustates_tag()); 493 lastline++; 494 495 while ((thisname = *names++) != NULL) 496 { 497 if (*thisname != '\0') 498 { 499 printf("%s %% %s", i++ == 0 ? "" : ", ", thisname); 500 } 501 } 502 503 /* fill the "last" array with all -1s, to insure correct updating */ 504 lp = lcpustates; 505 i = num_cpustates; 506 while (--i >= 0) 507 { 508 *lp++ = -1; 509 } 510} 511 512/* 513 * *_memory(stats) - print "Memory: " followed by the memory summary string 514 * 515 * Assumptions: cursor is on "lastline" 516 * for i_memory ONLY: cursor is on the previous line 517 */ 518 519char memory_buffer[MAX_COLS]; 520 521i_memory(stats) 522 523int *stats; 524 525{ 526 fputs("\nMem: ", stdout); 527 lastline++; 528 529 /* format and print the memory summary */ 530 summary_format(memory_buffer, stats, memory_names); 531 fputs(memory_buffer, stdout); 532} 533 534u_memory(stats) 535 536int *stats; 537 538{ 539 static char new[MAX_COLS]; 540 541 /* format the new line */ 542 summary_format(new, stats, memory_names); 543 line_update(memory_buffer, new, x_mem, y_mem); 544} 545 546/* 547 * *_swap(stats) - print "Swap: " followed by the swap summary string 548 * 549 * Assumptions: cursor is on "lastline" 550 * for i_swap ONLY: cursor is on the previous line 551 */ 552 553char swap_buffer[MAX_COLS]; 554 555i_swap(stats) 556 557int *stats; 558 559{ 560 fputs("\nSwap: ", stdout); 561 lastline++; 562 563 /* format and print the swap summary */ 564 summary_format(swap_buffer, stats, swap_names); 565 fputs(swap_buffer, stdout); 566} 567 568u_swap(stats) 569 570int *stats; 571 572{ 573 static char new[MAX_COLS]; 574 575 /* format the new line */ 576 summary_format(new, stats, swap_names); 577 line_update(swap_buffer, new, x_swap, y_swap); 578} 579 580/* 581 * *_message() - print the next pending message line, or erase the one 582 * that is there. 583 * 584 * Note that u_message is (currently) the same as i_message. 585 * 586 * Assumptions: lastline is consistent 587 */ 588 589/* 590 * i_message is funny because it gets its message asynchronously (with 591 * respect to screen updates). 592 */ 593 594static char next_msg[MAX_COLS + 5]; 595static int msglen = 0; 596/* Invariant: msglen is always the length of the message currently displayed 597 on the screen (even when next_msg doesn't contain that message). */ 598 599i_message() 600 601{ 602 while (lastline < y_message) 603 { 604 fputc('\n', stdout); 605 lastline++; 606 } 607 if (next_msg[0] != '\0') 608 { 609 standout(next_msg); 610 msglen = strlen(next_msg); 611 next_msg[0] = '\0'; 612 } 613 else if (msglen > 0) 614 { 615 (void) clear_eol(msglen); 616 msglen = 0; 617 } 618} 619 620u_message() 621 622{ 623 i_message(); 624} 625 626static int header_length; 627 628/* 629 * *_header(text) - print the header for the process area 630 * 631 * Assumptions: cursor is on the previous line and lastline is consistent 632 */ 633 634i_header(text) 635 636char *text; 637 638{ 639 header_length = strlen(text); 640 if (header_status == ON) 641 { 642 putchar('\n'); 643 fputs(text, stdout); 644 lastline++; 645 } 646 else if (header_status == ERASE) 647 { 648 header_status = OFF; 649 } 650} 651 652/*ARGSUSED*/ 653u_header(text) 654 655char *text; /* ignored */ 656 657{ 658 if (header_status == ERASE) 659 { 660 putchar('\n'); 661 lastline++; 662 clear_eol(header_length); 663 header_status = OFF; 664 } 665} 666 667/* 668 * *_process(line, thisline) - print one process line 669 * 670 * Assumptions: lastline is consistent 671 */ 672 673i_process(line, thisline) 674 675int line; 676char *thisline; 677 678{ 679 register char *p; 680 register char *base; 681 682 /* make sure we are on the correct line */ 683 while (lastline < y_procs + line) 684 { 685 putchar('\n'); 686 lastline++; 687 } 688 689 /* truncate the line to conform to our current screen width */ 690 thisline[display_width] = '\0'; 691 692 /* write the line out */ 693 fputs(thisline, stdout); 694 695 /* copy it in to our buffer */ 696 base = smart_terminal ? screenbuf + lineindex(line) : screenbuf; 697 p = strecpy(base, thisline); 698 699 /* zero fill the rest of it */ 700 memzero(p, display_width - (p - base)); 701} 702 703u_process(line, newline) 704 705int line; 706char *newline; 707 708{ 709 register char *optr; 710 register int screen_line = line + Header_lines; 711 register char *bufferline; 712 713 /* remember a pointer to the current line in the screen buffer */ 714 bufferline = &screenbuf[lineindex(line)]; 715 716 /* truncate the line to conform to our current screen width */ 717 newline[display_width] = '\0'; 718 719 /* is line higher than we went on the last display? */ 720 if (line >= last_hi) 721 { 722 /* yes, just ignore screenbuf and write it out directly */ 723 /* get positioned on the correct line */ 724 if (screen_line - lastline == 1) 725 { 726 putchar('\n'); 727 lastline++; 728 } 729 else 730 { 731 Move_to(0, screen_line); 732 lastline = screen_line; 733 } 734 735 /* now write the line */ 736 fputs(newline, stdout); 737 738 /* copy it in to the buffer */ 739 optr = strecpy(bufferline, newline); 740 741 /* zero fill the rest of it */ 742 memzero(optr, display_width - (optr - bufferline)); 743 } 744 else 745 { 746 line_update(bufferline, newline, 0, line + Header_lines); 747 } 748} 749 750u_endscreen(hi) 751 752register int hi; 753 754{ 755 register int screen_line = hi + Header_lines; 756 register int i; 757 758 if (smart_terminal) 759 { 760 if (hi < last_hi) 761 { 762 /* need to blank the remainder of the screen */ 763 /* but only if there is any screen left below this line */ 764 if (lastline + 1 < screen_length) 765 { 766 /* efficiently move to the end of currently displayed info */ 767 if (screen_line - lastline < 5) 768 { 769 while (lastline < screen_line) 770 { 771 putchar('\n'); 772 lastline++; 773 } 774 } 775 else 776 { 777 Move_to(0, screen_line); 778 lastline = screen_line; 779 } 780 781 if (clear_to_end) 782 { 783 /* we can do this the easy way */ 784 putcap(clear_to_end); 785 } 786 else 787 { 788 /* use clear_eol on each line */ 789 i = hi; 790 while ((void) clear_eol(strlen(&screenbuf[lineindex(i++)])), i < last_hi) 791 { 792 putchar('\n'); 793 } 794 } 795 } 796 } 797 last_hi = hi; 798 799 /* move the cursor to a pleasant place */ 800 Move_to(x_idlecursor, y_idlecursor); 801 lastline = y_idlecursor; 802 } 803 else 804 { 805 /* separate this display from the next with some vertical room */ 806 fputs("\n\n", stdout); 807 } 808} 809 810display_header(t) 811 812int t; 813 814{ 815 if (t) 816 { 817 header_status = ON; 818 } 819 else if (header_status == ON) 820 { 821 header_status = ERASE; 822 } 823} 824 825/*VARARGS2*/ 826new_message(type, msgfmt, a1, a2, a3) 827 828int type; 829char *msgfmt; 830caddr_t a1, a2, a3; 831 832{ 833 register int i; 834 835 /* first, format the message */ 836 (void) snprintf(next_msg, sizeof(next_msg), msgfmt, a1, a2, a3); 837 838 if (msglen > 0) 839 { 840 /* message there already -- can we clear it? */ 841 if (!overstrike) 842 { 843 /* yes -- write it and clear to end */ 844 i = strlen(next_msg); 845 if ((type & MT_delayed) == 0) 846 { 847 type & MT_standout ? standout(next_msg) : 848 fputs(next_msg, stdout); 849 (void) clear_eol(msglen - i); 850 msglen = i; 851 next_msg[0] = '\0'; 852 } 853 } 854 } 855 else 856 { 857 if ((type & MT_delayed) == 0) 858 { 859 type & MT_standout ? standout(next_msg) : fputs(next_msg, stdout); 860 msglen = strlen(next_msg); 861 next_msg[0] = '\0'; 862 } 863 } 864} 865 866clear_message() 867 868{ 869 if (clear_eol(msglen) == 1) 870 { 871 putchar('\r'); 872 } 873} 874 875readline(buffer, size, numeric) 876 877char *buffer; 878int size; 879int numeric; 880 881{ 882 register char *ptr = buffer; 883 register char ch; 884 register char cnt = 0; 885 register char maxcnt = 0; 886 887 /* allow room for null terminator */ 888 size -= 1; 889 890 /* read loop */ 891 while ((fflush(stdout), read(0, ptr, 1) > 0)) 892 { 893 /* newline means we are done */ 894 if ((ch = *ptr) == '\n' || ch == '\r') 895 { 896 break; 897 } 898 899 /* handle special editing characters */ 900 if (ch == ch_kill) 901 { 902 /* kill line -- account for overstriking */ 903 if (overstrike) 904 { 905 msglen += maxcnt; 906 } 907 908 /* return null string */ 909 *buffer = '\0'; 910 putchar('\r'); 911 return(-1); 912 } 913 else if (ch == ch_erase) 914 { 915 /* erase previous character */ 916 if (cnt <= 0) 917 { 918 /* none to erase! */ 919 putchar('\7'); 920 } 921 else 922 { 923 fputs("\b \b", stdout); 924 ptr--; 925 cnt--; 926 } 927 } 928 /* check for character validity and buffer overflow */ 929 else if (cnt == size || (numeric && !isdigit(ch)) || 930 !isprint(ch)) 931 { 932 /* not legal */ 933 putchar('\7'); 934 } 935 else 936 { 937 /* echo it and store it in the buffer */ 938 putchar(ch); 939 ptr++; 940 cnt++; 941 if (cnt > maxcnt) 942 { 943 maxcnt = cnt; 944 } 945 } 946 } 947 948 /* all done -- null terminate the string */ 949 *ptr = '\0'; 950 951 /* account for the extra characters in the message area */ 952 /* (if terminal overstrikes, remember the furthest they went) */ 953 msglen += overstrike ? maxcnt : cnt; 954 955 /* return either inputted number or string length */ 956 putchar('\r'); 957 return(cnt == 0 ? -1 : numeric ? atoi(buffer) : cnt); 958} 959 960/* internal support routines */ 961 962static int string_count(pp) 963 964register char **pp; 965 966{ 967 register int cnt; 968 969 cnt = 0; 970 while (*pp++ != NULL) 971 { 972 cnt++; 973 } 974 return(cnt); 975} 976 977static void summary_format(str, numbers, names) 978 979char *str; 980int *numbers; 981register char **names; 982 983{ 984 register char *p; 985 register int num; 986 register char *thisname; 987 register int useM = No; 988 989 /* format each number followed by its string */ 990 p = str; 991 while ((thisname = *names++) != NULL) 992 { 993 /* get the number to format */ 994 num = *numbers++; 995 996 /* display only non-zero numbers */ 997 if (num > 0) 998 { 999 /* is this number in kilobytes? */ 1000 if (thisname[0] == 'K') 1001 { 1002 /* yes: format it as a memory value */ 1003 p = strecpy(p, format_k(num)); 1004 1005 /* skip over the K, since it was included by format_k */ 1006 p = strecpy(p, thisname+1); 1007 } 1008 else 1009 { 1010 p = strecpy(p, itoa(num)); 1011 p = strecpy(p, thisname); 1012 } 1013 } 1014 1015 /* ignore negative numbers, but display corresponding string */ 1016 else if (num < 0) 1017 { 1018 p = strecpy(p, thisname); 1019 } 1020 } 1021 1022 /* if the last two characters in the string are ", ", delete them */ 1023 p -= 2; 1024 if (p >= str && p[0] == ',' && p[1] == ' ') 1025 { 1026 *p = '\0'; 1027 } 1028} 1029 1030static void line_update(old, new, start, line) 1031 1032register char *old; 1033register char *new; 1034int start; 1035int line; 1036 1037{ 1038 register int ch; 1039 register int diff; 1040 register int newcol = start + 1; 1041 register int lastcol = start; 1042 char cursor_on_line = No; 1043 char *current; 1044 1045 /* compare the two strings and only rewrite what has changed */ 1046 current = old; 1047#ifdef DEBUG 1048 fprintf(debug, "line_update, starting at %d\n", start); 1049 fputs(old, debug); 1050 fputc('\n', debug); 1051 fputs(new, debug); 1052 fputs("\n-\n", debug); 1053#endif 1054 1055 /* start things off on the right foot */ 1056 /* this is to make sure the invariants get set up right */ 1057 if ((ch = *new++) != *old) 1058 { 1059 if (line - lastline == 1 && start == 0) 1060 { 1061 putchar('\n'); 1062 } 1063 else 1064 { 1065 Move_to(start, line); 1066 } 1067 cursor_on_line = Yes; 1068 putchar(ch); 1069 *old = ch; 1070 lastcol = 1; 1071 } 1072 old++; 1073 1074 /* 1075 * main loop -- check each character. If the old and new aren't the 1076 * same, then update the display. When the distance from the 1077 * current cursor position to the new change is small enough, 1078 * the characters that belong there are written to move the 1079 * cursor over. 1080 * 1081 * Invariants: 1082 * lastcol is the column where the cursor currently is sitting 1083 * (always one beyond the end of the last mismatch). 1084 */ 1085 do /* yes, a do...while */ 1086 { 1087 if ((ch = *new++) != *old) 1088 { 1089 /* new character is different from old */ 1090 /* make sure the cursor is on top of this character */ 1091 diff = newcol - lastcol; 1092 if (diff > 0) 1093 { 1094 /* some motion is required--figure out which is shorter */ 1095 if (diff < 6 && cursor_on_line) 1096 { 1097 /* overwrite old stuff--get it out of the old buffer */ 1098 printf("%.*s", diff, ¤t[lastcol-start]); 1099 } 1100 else 1101 { 1102 /* use cursor addressing */ 1103 Move_to(newcol, line); 1104 cursor_on_line = Yes; 1105 } 1106 /* remember where the cursor is */ 1107 lastcol = newcol + 1; 1108 } 1109 else 1110 { 1111 /* already there, update position */ 1112 lastcol++; 1113 } 1114 1115 /* write what we need to */ 1116 if (ch == '\0') 1117 { 1118 /* at the end--terminate with a clear-to-end-of-line */ 1119 (void) clear_eol(strlen(old)); 1120 } 1121 else 1122 { 1123 /* write the new character */ 1124 putchar(ch); 1125 } 1126 /* put the new character in the screen buffer */ 1127 *old = ch; 1128 } 1129 1130 /* update working column and screen buffer pointer */ 1131 newcol++; 1132 old++; 1133 1134 } while (ch != '\0'); 1135 1136 /* zero out the rest of the line buffer -- MUST BE DONE! */ 1137 diff = display_width - newcol; 1138 if (diff > 0) 1139 { 1140 memzero(old, diff); 1141 } 1142 1143 /* remember where the current line is */ 1144 if (cursor_on_line) 1145 { 1146 lastline = line; 1147 } 1148} 1149 1150/* 1151 * printable(str) - make the string pointed to by "str" into one that is 1152 * printable (i.e.: all ascii), by converting all non-printable 1153 * characters into '?'. Replacements are done in place and a pointer 1154 * to the original buffer is returned. 1155 */ 1156 1157char *printable(str) 1158 1159char *str; 1160 1161{ 1162 register char *ptr; 1163 register char ch; 1164 1165 ptr = str; 1166 while ((ch = *ptr) != '\0') 1167 { 1168 if (!isprint(ch)) 1169 { 1170 *ptr = '?'; 1171 } 1172 ptr++; 1173 } 1174 return(str); 1175} 1176 1177i_uptime(bt, tod) 1178 1179struct timeval* bt; 1180time_t *tod; 1181 1182{ 1183 time_t uptime; 1184 int days, hrs, mins, secs; 1185 1186 if (bt->tv_sec != -1) { 1187 uptime = *tod - bt->tv_sec; 1188 uptime += 30; 1189 days = uptime / 86400; 1190 uptime %= 86400; 1191 hrs = uptime / 3600; 1192 uptime %= 3600; 1193 mins = uptime / 60; 1194 secs = uptime % 60; 1195 1196 /* 1197 * Display the uptime. 1198 */ 1199 1200 if (smart_terminal) 1201 { 1202 Move_to((screen_width - 24) - (days > 9 ? 1 : 0), 0); 1203 } 1204 else 1205 { 1206 fputs(" ", stdout); 1207 } 1208 printf(" up %d+%02d:%02d:%02d", days, hrs, mins, secs); 1209 } 1210} 1211