display.c revision 224205 
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 224205 2011-07-18 21:15:47Z jhb $
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 num_cpus;
82static int *cpustate_columns;
83static int cpustate_total_length;
84static int cpustates_column;
85
86static enum { OFF, ON, ERASE } header_status = ON;
87
88static int string_count();
89static void summary_format();
90static void line_update();
91
92int  x_lastpid =	10;
93int  y_lastpid =	0;
94int  x_loadave =	33;
95int  x_loadave_nompid =	15;
96int  y_loadave =	0;
97int  x_procstate =	0;
98int  y_procstate =	1;
99int  x_brkdn =		15;
100int  y_brkdn =		1;
101int  x_mem =		5;
102int  y_mem =		3;
103int  x_swap =		6;
104int  y_swap =		4;
105int  y_message =	5;
106int  x_header =		0;
107int  y_header =		6;
108int  x_idlecursor =	0;
109int  y_idlecursor =	5;
110int  y_procs =		7;
111
112int  y_cpustates =	2;
113int  Header_lines =	7;
114
115int display_resize()
116
117{
118    register int lines;
119
120    /* first, deallocate any previous buffer that may have been there */
121    if (screenbuf != NULL)
122    {
123	free(screenbuf);
124    }
125
126    /* calculate the current dimensions */
127    /* if operating in "dumb" mode, we only need one line */
128    lines = smart_terminal ? screen_length - Header_lines : 1;
129
130    if (lines < 0)
131	lines = 0;
132    /* we don't want more than MAX_COLS columns, since the machine-dependent
133       modules make static allocations based on MAX_COLS and we don't want
134       to run off the end of their buffers */
135    display_width = screen_width;
136    if (display_width >= MAX_COLS)
137    {
138	display_width = MAX_COLS - 1;
139    }
140
141    /* now, allocate space for the screen buffer */
142    screenbuf = (char *)malloc(lines * display_width);
143    if (screenbuf == (char *)NULL)
144    {
145	/* oops! */
146	return(-1);
147    }
148
149    /* return number of lines available */
150    /* for dumb terminals, pretend like we can show any amount */
151    return(smart_terminal ? lines : Largest);
152}
153
154int display_updatecpus(statics)
155
156struct statics *statics;
157
158{
159    register int *lp;
160    register int lines;
161    register int i;
162
163    /* call resize to do the dirty work */
164    lines = display_resize();
165    if (pcpu_stats)
166	num_cpus = statics->ncpus;
167    else
168	num_cpus = 1;
169    cpustates_column = 5;	/* CPU: */
170    if (num_cpus != 1)
171    cpustates_column += 2;	/* CPU 0: */
172    for (i = num_cpus; i > 9; i /= 10)
173	cpustates_column++;
174
175    /* fill the "last" array with all -1s, to insure correct updating */
176    lp = lcpustates;
177    i = num_cpustates * num_cpus;
178    while (--i >= 0)
179    {
180	*lp++ = -1;
181    }
182
183    return(lines);
184}
185
186int display_init(statics)
187
188struct statics *statics;
189
190{
191    register int lines;
192    register char **pp;
193    register int *ip;
194    register int i;
195
196    lines = display_updatecpus(statics);
197
198    /* only do the rest if we need to */
199    if (lines > -1)
200    {
201	/* save pointers and allocate space for names */
202	procstate_names = statics->procstate_names;
203	num_procstates = string_count(procstate_names);
204	lprocstates = (int *)malloc(num_procstates * sizeof(int));
205
206	cpustate_names = statics->cpustate_names;
207
208	swap_names = statics->swap_names;
209	num_swap = string_count(swap_names);
210	lswap = (int *)malloc(num_swap * sizeof(int));
211	num_cpustates = string_count(cpustate_names);
212	lcpustates = (int *)malloc(num_cpustates * sizeof(int) * statics->ncpus);
213	cpustate_columns = (int *)malloc(num_cpustates * sizeof(int));
214
215	memory_names = statics->memory_names;
216	num_memory = string_count(memory_names);
217	lmemory = (int *)malloc(num_memory * sizeof(int));
218
219	/* calculate starting columns where needed */
220	cpustate_total_length = 0;
221	pp = cpustate_names;
222	ip = cpustate_columns;
223	while (*pp != NULL)
224	{
225	    *ip++ = cpustate_total_length;
226	    if ((i = strlen(*pp++)) > 0)
227	    {
228		cpustate_total_length += i + 8;
229	    }
230	}
231    }
232
233    /* return number of lines available */
234    return(lines);
235}
236
237i_loadave(mpid, avenrun)
238
239int mpid;
240double *avenrun;
241
242{
243    register int i;
244
245    /* i_loadave also clears the screen, since it is first */
246    clear();
247
248    /* mpid == -1 implies this system doesn't have an _mpid */
249    if (mpid != -1)
250    {
251	printf("last pid: %5d;  ", mpid);
252    }
253
254    printf("load averages");
255
256    for (i = 0; i < 3; i++)
257    {
258	printf("%c %5.2f",
259	    i == 0 ? ':' : ',',
260	    avenrun[i]);
261    }
262    lmpid = mpid;
263}
264
265u_loadave(mpid, avenrun)
266
267int mpid;
268double *avenrun;
269
270{
271    register int i;
272
273    if (mpid != -1)
274    {
275	/* change screen only when value has really changed */
276	if (mpid != lmpid)
277	{
278	    Move_to(x_lastpid, y_lastpid);
279	    printf("%5d", mpid);
280	    lmpid = mpid;
281	}
282
283	/* i remembers x coordinate to move to */
284	i = x_loadave;
285    }
286    else
287    {
288	i = x_loadave_nompid;
289    }
290
291    /* move into position for load averages */
292    Move_to(i, y_loadave);
293
294    /* display new load averages */
295    /* we should optimize this and only display changes */
296    for (i = 0; i < 3; i++)
297    {
298	printf("%s%5.2f",
299	    i == 0 ? "" : ", ",
300	    avenrun[i]);
301    }
302}
303
304i_timeofday(tod)
305
306time_t *tod;
307
308{
309    /*
310     *  Display the current time.
311     *  "ctime" always returns a string that looks like this:
312     *
313     *	Sun Sep 16 01:03:52 1973
314     *      012345678901234567890123
315     *	          1         2
316     *
317     *  We want indices 11 thru 18 (length 8).
318     */
319
320    if (smart_terminal)
321    {
322	Move_to(screen_width - 8, 0);
323    }
324    else
325    {
326	fputs("    ", stdout);
327    }
328#ifdef DEBUG
329    {
330	char *foo;
331	foo = ctime(tod);
332	fputs(foo, stdout);
333    }
334#endif
335    printf("%-8.8s\n", &(ctime(tod)[11]));
336    lastline = 1;
337}
338
339static int ltotal = 0;
340static char procstates_buffer[MAX_COLS];
341
342/*
343 *  *_procstates(total, brkdn, names) - print the process summary line
344 *
345 *  Assumptions:  cursor is at the beginning of the line on entry
346 *		  lastline is valid
347 */
348
349i_procstates(total, brkdn)
350
351int total;
352int *brkdn;
353
354{
355    register int i;
356
357    /* write current number of processes and remember the value */
358    printf("%d processes:", total);
359    ltotal = total;
360
361    /* put out enough spaces to get to column 15 */
362    i = digits(total);
363    while (i++ < 4)
364    {
365	putchar(' ');
366    }
367
368    /* format and print the process state summary */
369    summary_format(procstates_buffer, brkdn, procstate_names);
370    fputs(procstates_buffer, stdout);
371
372    /* save the numbers for next time */
373    memcpy(lprocstates, brkdn, num_procstates * sizeof(int));
374}
375
376u_procstates(total, brkdn)
377
378int total;
379int *brkdn;
380
381{
382    static char new[MAX_COLS];
383    register int i;
384
385    /* update number of processes only if it has changed */
386    if (ltotal != total)
387    {
388	/* move and overwrite */
389#if (x_procstate == 0)
390	Move_to(x_procstate, y_procstate);
391#else
392	/* cursor is already there...no motion needed */
393	/* assert(lastline == 1); */
394#endif
395	printf("%d", total);
396
397	/* if number of digits differs, rewrite the label */
398	if (digits(total) != digits(ltotal))
399	{
400	    fputs(" processes:", stdout);
401	    /* put out enough spaces to get to column 15 */
402	    i = digits(total);
403	    while (i++ < 4)
404	    {
405		putchar(' ');
406	    }
407	    /* cursor may end up right where we want it!!! */
408	}
409
410	/* save new total */
411	ltotal = total;
412    }
413
414    /* see if any of the state numbers has changed */
415    if (memcmp(lprocstates, brkdn, num_procstates * sizeof(int)) != 0)
416    {
417	/* format and update the line */
418	summary_format(new, brkdn, procstate_names);
419	line_update(procstates_buffer, new, x_brkdn, y_brkdn);
420	memcpy(lprocstates, brkdn, num_procstates * sizeof(int));
421    }
422}
423
424#ifdef no_more
425/*
426 *  *_cpustates(states, names) - print the cpu state percentages
427 *
428 *  Assumptions:  cursor is on the PREVIOUS line
429 */
430
431/* cpustates_tag() calculates the correct tag to use to label the line */
432
433char *cpustates_tag()
434
435{
436    register char *use;
437
438    static char *short_tag = "CPU: ";
439    static char *long_tag = "CPU states: ";
440
441    /* if length + strlen(long_tag) >= screen_width, then we have to
442       use the shorter tag (we subtract 2 to account for ": ") */
443    if (cpustate_total_length + (int)strlen(long_tag) - 2 >= screen_width)
444    {
445	use = short_tag;
446    }
447    else
448    {
449	use = long_tag;
450    }
451
452    /* set cpustates_column accordingly then return result */
453    cpustates_column = strlen(use);
454    return(use);
455}
456#endif
457
458i_cpustates(states)
459
460register int *states;
461
462{
463    register int i = 0;
464    register int value;
465    register char **names;
466    register char *thisname;
467    int cpu;
468
469for (cpu = 0; cpu < num_cpus; cpu++) {
470    names = cpustate_names;
471
472    /* print tag and bump lastline */
473    if (num_cpus == 1)
474	printf("\nCPU: ");
475    else {
476	value = printf("\nCPU %d: ", cpu);
477	while (value++ <= cpustates_column)
478		printf(" ");
479    }
480    lastline++;
481
482    /* now walk thru the names and print the line */
483    while ((thisname = *names++) != NULL)
484    {
485	if (*thisname != '\0')
486	{
487	    /* retrieve the value and remember it */
488	    value = *states++;
489
490	    /* if percentage is >= 1000, print it as 100% */
491	    printf((value >= 1000 ? "%s%4.0f%% %s" : "%s%4.1f%% %s"),
492		   (i++ % num_cpustates) == 0 ? "" : ", ",
493		   ((float)value)/10.,
494		   thisname);
495	}
496    }
497}
498
499    /* copy over values into "last" array */
500    memcpy(lcpustates, states, num_cpustates * sizeof(int) * num_cpus);
501}
502
503u_cpustates(states)
504
505register int *states;
506
507{
508    register int value;
509    register char **names;
510    register char *thisname;
511    register int *lp;
512    register int *colp;
513    int cpu;
514
515for (cpu = 0; cpu < num_cpus; cpu++) {
516    names = cpustate_names;
517
518    Move_to(cpustates_column, y_cpustates + cpu);
519    lastline = y_cpustates + cpu;
520    lp = lcpustates + (cpu * num_cpustates);
521    colp = cpustate_columns;
522
523    /* we could be much more optimal about this */
524    while ((thisname = *names++) != NULL)
525    {
526	if (*thisname != '\0')
527	{
528	    /* did the value change since last time? */
529	    if (*lp != *states)
530	    {
531		/* yes, move and change */
532		Move_to(cpustates_column + *colp, y_cpustates + cpu);
533		lastline = y_cpustates + cpu;
534
535		/* retrieve value and remember it */
536		value = *states;
537
538		/* if percentage is >= 1000, print it as 100% */
539		printf((value >= 1000 ? "%4.0f" : "%4.1f"),
540		       ((double)value)/10.);
541
542		/* remember it for next time */
543		*lp = value;
544	    }
545	}
546
547	/* increment and move on */
548	lp++;
549	states++;
550	colp++;
551    }
552}
553}
554
555z_cpustates()
556
557{
558    register int i = 0;
559    register char **names;
560    register char *thisname;
561    register int *lp;
562    int cpu, value;
563
564for (cpu = 0; cpu < num_cpus; cpu++) {
565    names = cpustate_names;
566
567    /* show tag and bump lastline */
568    if (num_cpus == 1)
569	printf("\nCPU: ");
570    else {
571	value = printf("\nCPU %d: ", cpu);
572	while (value++ <= cpustates_column)
573		printf(" ");
574    }
575    lastline++;
576
577    while ((thisname = *names++) != NULL)
578    {
579	if (*thisname != '\0')
580	{
581	    printf("%s    %% %s", (i++ % num_cpustates) == 0 ? "" : ", ", thisname);
582	}
583    }
584}
585
586    /* fill the "last" array with all -1s, to insure correct updating */
587    lp = lcpustates;
588    i = num_cpustates * num_cpus;
589    while (--i >= 0)
590    {
591	*lp++ = -1;
592    }
593}
594
595/*
596 *  *_memory(stats) - print "Memory: " followed by the memory summary string
597 *
598 *  Assumptions:  cursor is on "lastline"
599 *                for i_memory ONLY: cursor is on the previous line
600 */
601
602char memory_buffer[MAX_COLS];
603
604i_memory(stats)
605
606int *stats;
607
608{
609    fputs("\nMem: ", stdout);
610    lastline++;
611
612    /* format and print the memory summary */
613    summary_format(memory_buffer, stats, memory_names);
614    fputs(memory_buffer, stdout);
615}
616
617u_memory(stats)
618
619int *stats;
620
621{
622    static char new[MAX_COLS];
623
624    /* format the new line */
625    summary_format(new, stats, memory_names);
626    line_update(memory_buffer, new, x_mem, y_mem);
627}
628
629/*
630 *  *_swap(stats) - print "Swap: " followed by the swap summary string
631 *
632 *  Assumptions:  cursor is on "lastline"
633 *                for i_swap ONLY: cursor is on the previous line
634 */
635
636char swap_buffer[MAX_COLS];
637
638i_swap(stats)
639
640int *stats;
641
642{
643    fputs("\nSwap: ", stdout);
644    lastline++;
645
646    /* format and print the swap summary */
647    summary_format(swap_buffer, stats, swap_names);
648    fputs(swap_buffer, stdout);
649}
650
651u_swap(stats)
652
653int *stats;
654
655{
656    static char new[MAX_COLS];
657
658    /* format the new line */
659    summary_format(new, stats, swap_names);
660    line_update(swap_buffer, new, x_swap, y_swap);
661}
662
663/*
664 *  *_message() - print the next pending message line, or erase the one
665 *                that is there.
666 *
667 *  Note that u_message is (currently) the same as i_message.
668 *
669 *  Assumptions:  lastline is consistent
670 */
671
672/*
673 *  i_message is funny because it gets its message asynchronously (with
674 *	respect to screen updates).
675 */
676
677static char next_msg[MAX_COLS + 5];
678static int msglen = 0;
679/* Invariant: msglen is always the length of the message currently displayed
680   on the screen (even when next_msg doesn't contain that message). */
681
682i_message()
683
684{
685    while (lastline < y_message)
686    {
687	fputc('\n', stdout);
688	lastline++;
689    }
690    if (next_msg[0] != '\0')
691    {
692	standout(next_msg);
693	msglen = strlen(next_msg);
694	next_msg[0] = '\0';
695    }
696    else if (msglen > 0)
697    {
698	(void) clear_eol(msglen);
699	msglen = 0;
700    }
701}
702
703u_message()
704
705{
706    i_message();
707}
708
709static int header_length;
710
711/*
712 * Trim a header string to the current display width and return a newly
713 * allocated area with the trimmed header.
714 */
715
716char *
717trim_header(text)
718
719char *text;
720
721{
722	char *s;
723	int width;
724
725	s = NULL;
726	width = display_width;
727	header_length = strlen(text);
728	if (header_length >= width) {
729		s = malloc((width + 1) * sizeof(char));
730		if (s == NULL)
731			return (NULL);
732		strncpy(s, text, width);
733		s[width] = '\0';
734	}
735	return (s);
736}
737
738/*
739 *  *_header(text) - print the header for the process area
740 *
741 *  Assumptions:  cursor is on the previous line and lastline is consistent
742 */
743
744i_header(text)
745
746char *text;
747
748{
749    char *s;
750
751    s = trim_header(text);
752    if (s != NULL)
753	text = s;
754
755    if (header_status == ON)
756    {
757	putchar('\n');
758	fputs(text, stdout);
759	lastline++;
760    }
761    else if (header_status == ERASE)
762    {
763	header_status = OFF;
764    }
765    free(s);
766}
767
768/*ARGSUSED*/
769u_header(text)
770
771char *text;		/* ignored */
772
773{
774
775    if (header_status == ERASE)
776    {
777	putchar('\n');
778	lastline++;
779	clear_eol(header_length);
780	header_status = OFF;
781    }
782}
783
784/*
785 *  *_process(line, thisline) - print one process line
786 *
787 *  Assumptions:  lastline is consistent
788 */
789
790i_process(line, thisline)
791
792int line;
793char *thisline;
794
795{
796    register char *p;
797    register char *base;
798
799    /* make sure we are on the correct line */
800    while (lastline < y_procs + line)
801    {
802	putchar('\n');
803	lastline++;
804    }
805
806    /* truncate the line to conform to our current screen width */
807    thisline[display_width] = '\0';
808
809    /* write the line out */
810    fputs(thisline, stdout);
811
812    /* copy it in to our buffer */
813    base = smart_terminal ? screenbuf + lineindex(line) : screenbuf;
814    p = strecpy(base, thisline);
815
816    /* zero fill the rest of it */
817    memzero(p, display_width - (p - base));
818}
819
820u_process(line, newline)
821
822int line;
823char *newline;
824
825{
826    register char *optr;
827    register int screen_line = line + Header_lines;
828    register char *bufferline;
829
830    /* remember a pointer to the current line in the screen buffer */
831    bufferline = &screenbuf[lineindex(line)];
832
833    /* truncate the line to conform to our current screen width */
834    newline[display_width] = '\0';
835
836    /* is line higher than we went on the last display? */
837    if (line >= last_hi)
838    {
839	/* yes, just ignore screenbuf and write it out directly */
840	/* get positioned on the correct line */
841	if (screen_line - lastline == 1)
842	{
843	    putchar('\n');
844	    lastline++;
845	}
846	else
847	{
848	    Move_to(0, screen_line);
849	    lastline = screen_line;
850	}
851
852	/* now write the line */
853	fputs(newline, stdout);
854
855	/* copy it in to the buffer */
856	optr = strecpy(bufferline, newline);
857
858	/* zero fill the rest of it */
859	memzero(optr, display_width - (optr - bufferline));
860    }
861    else
862    {
863	line_update(bufferline, newline, 0, line + Header_lines);
864    }
865}
866
867u_endscreen(hi)
868
869register int hi;
870
871{
872    register int screen_line = hi + Header_lines;
873    register int i;
874
875    if (smart_terminal)
876    {
877	if (hi < last_hi)
878	{
879	    /* need to blank the remainder of the screen */
880	    /* but only if there is any screen left below this line */
881	    if (lastline + 1 < screen_length)
882	    {
883		/* efficiently move to the end of currently displayed info */
884		if (screen_line - lastline < 5)
885		{
886		    while (lastline < screen_line)
887		    {
888			putchar('\n');
889			lastline++;
890		    }
891		}
892		else
893		{
894		    Move_to(0, screen_line);
895		    lastline = screen_line;
896		}
897
898		if (clear_to_end)
899		{
900		    /* we can do this the easy way */
901		    putcap(clear_to_end);
902		}
903		else
904		{
905		    /* use clear_eol on each line */
906		    i = hi;
907		    while ((void) clear_eol(strlen(&screenbuf[lineindex(i++)])), i < last_hi)
908		    {
909			putchar('\n');
910		    }
911		}
912	    }
913	}
914	last_hi = hi;
915
916	/* move the cursor to a pleasant place */
917	Move_to(x_idlecursor, y_idlecursor);
918	lastline = y_idlecursor;
919    }
920    else
921    {
922	/* separate this display from the next with some vertical room */
923	fputs("\n\n", stdout);
924    }
925}
926
927display_header(t)
928
929int t;
930
931{
932    if (t)
933    {
934	header_status = ON;
935    }
936    else if (header_status == ON)
937    {
938	header_status = ERASE;
939    }
940}
941
942/*VARARGS2*/
943new_message(type, msgfmt, a1, a2, a3)
944
945int type;
946char *msgfmt;
947caddr_t a1, a2, a3;
948
949{
950    register int i;
951
952    /* first, format the message */
953    (void) snprintf(next_msg, sizeof(next_msg), msgfmt, a1, a2, a3);
954
955    if (msglen > 0)
956    {
957	/* message there already -- can we clear it? */
958	if (!overstrike)
959	{
960	    /* yes -- write it and clear to end */
961	    i = strlen(next_msg);
962	    if ((type & MT_delayed) == 0)
963	    {
964		type & MT_standout ? standout(next_msg) :
965		                     fputs(next_msg, stdout);
966		(void) clear_eol(msglen - i);
967		msglen = i;
968		next_msg[0] = '\0';
969	    }
970	}
971    }
972    else
973    {
974	if ((type & MT_delayed) == 0)
975	{
976	    type & MT_standout ? standout(next_msg) : fputs(next_msg, stdout);
977	    msglen = strlen(next_msg);
978	    next_msg[0] = '\0';
979	}
980    }
981}
982
983clear_message()
984
985{
986    if (clear_eol(msglen) == 1)
987    {
988	putchar('\r');
989    }
990}
991
992readline(buffer, size, numeric)
993
994char *buffer;
995int  size;
996int  numeric;
997
998{
999    register char *ptr = buffer;
1000    register char ch;
1001    register char cnt = 0;
1002    register char maxcnt = 0;
1003
1004    /* allow room for null terminator */
1005    size -= 1;
1006
1007    /* read loop */
1008    while ((fflush(stdout), read(0, ptr, 1) > 0))
1009    {
1010	/* newline means we are done */
1011	if ((ch = *ptr) == '\n' || ch == '\r')
1012	{
1013	    break;
1014	}
1015
1016	/* handle special editing characters */
1017	if (ch == ch_kill)
1018	{
1019	    /* kill line -- account for overstriking */
1020	    if (overstrike)
1021	    {
1022		msglen += maxcnt;
1023	    }
1024
1025	    /* return null string */
1026	    *buffer = '\0';
1027	    putchar('\r');
1028	    return(-1);
1029	}
1030	else if (ch == ch_erase)
1031	{
1032	    /* erase previous character */
1033	    if (cnt <= 0)
1034	    {
1035		/* none to erase! */
1036		putchar('\7');
1037	    }
1038	    else
1039	    {
1040		fputs("\b \b", stdout);
1041		ptr--;
1042		cnt--;
1043	    }
1044	}
1045	/* check for character validity and buffer overflow */
1046	else if (cnt == size || (numeric && !isdigit(ch)) ||
1047		!isprint(ch))
1048	{
1049	    /* not legal */
1050	    putchar('\7');
1051	}
1052	else
1053	{
1054	    /* echo it and store it in the buffer */
1055	    putchar(ch);
1056	    ptr++;
1057	    cnt++;
1058	    if (cnt > maxcnt)
1059	    {
1060		maxcnt = cnt;
1061	    }
1062	}
1063    }
1064
1065    /* all done -- null terminate the string */
1066    *ptr = '\0';
1067
1068    /* account for the extra characters in the message area */
1069    /* (if terminal overstrikes, remember the furthest they went) */
1070    msglen += overstrike ? maxcnt : cnt;
1071
1072    /* return either inputted number or string length */
1073    putchar('\r');
1074    return(cnt == 0 ? -1 : numeric ? atoi(buffer) : cnt);
1075}
1076
1077/* internal support routines */
1078
1079static int string_count(pp)
1080
1081register char **pp;
1082
1083{
1084    register int cnt;
1085
1086    cnt = 0;
1087    while (*pp++ != NULL)
1088    {
1089	cnt++;
1090    }
1091    return(cnt);
1092}
1093
1094static void summary_format(str, numbers, names)
1095
1096char *str;
1097int *numbers;
1098register char **names;
1099
1100{
1101    register char *p;
1102    register int num;
1103    register char *thisname;
1104    register int useM = No;
1105
1106    /* format each number followed by its string */
1107    p = str;
1108    while ((thisname = *names++) != NULL)
1109    {
1110	/* get the number to format */
1111	num = *numbers++;
1112
1113	/* display only non-zero numbers */
1114	if (num > 0)
1115	{
1116	    /* is this number in kilobytes? */
1117	    if (thisname[0] == 'K')
1118	    {
1119		/* yes: format it as a memory value */
1120		p = strecpy(p, format_k(num));
1121
1122		/* skip over the K, since it was included by format_k */
1123		p = strecpy(p, thisname+1);
1124	    }
1125	    else
1126	    {
1127		p = strecpy(p, itoa(num));
1128		p = strecpy(p, thisname);
1129	    }
1130	}
1131
1132	/* ignore negative numbers, but display corresponding string */
1133	else if (num < 0)
1134	{
1135	    p = strecpy(p, thisname);
1136	}
1137    }
1138
1139    /* if the last two characters in the string are ", ", delete them */
1140    p -= 2;
1141    if (p >= str && p[0] == ',' && p[1] == ' ')
1142    {
1143	*p = '\0';
1144    }
1145}
1146
1147static void line_update(old, new, start, line)
1148
1149register char *old;
1150register char *new;
1151int start;
1152int line;
1153
1154{
1155    register int ch;
1156    register int diff;
1157    register int newcol = start + 1;
1158    register int lastcol = start;
1159    char cursor_on_line = No;
1160    char *current;
1161
1162    /* compare the two strings and only rewrite what has changed */
1163    current = old;
1164#ifdef DEBUG
1165    fprintf(debug, "line_update, starting at %d\n", start);
1166    fputs(old, debug);
1167    fputc('\n', debug);
1168    fputs(new, debug);
1169    fputs("\n-\n", debug);
1170#endif
1171
1172    /* start things off on the right foot		    */
1173    /* this is to make sure the invariants get set up right */
1174    if ((ch = *new++) != *old)
1175    {
1176	if (line - lastline == 1 && start == 0)
1177	{
1178	    putchar('\n');
1179	}
1180	else
1181	{
1182	    Move_to(start, line);
1183	}
1184	cursor_on_line = Yes;
1185	putchar(ch);
1186	*old = ch;
1187	lastcol = 1;
1188    }
1189    old++;
1190
1191    /*
1192     *  main loop -- check each character.  If the old and new aren't the
1193     *	same, then update the display.  When the distance from the
1194     *	current cursor position to the new change is small enough,
1195     *	the characters that belong there are written to move the
1196     *	cursor over.
1197     *
1198     *	Invariants:
1199     *	    lastcol is the column where the cursor currently is sitting
1200     *		(always one beyond the end of the last mismatch).
1201     */
1202    do		/* yes, a do...while */
1203    {
1204	if ((ch = *new++) != *old)
1205	{
1206	    /* new character is different from old	  */
1207	    /* make sure the cursor is on top of this character */
1208	    diff = newcol - lastcol;
1209	    if (diff > 0)
1210	    {
1211		/* some motion is required--figure out which is shorter */
1212		if (diff < 6 && cursor_on_line)
1213		{
1214		    /* overwrite old stuff--get it out of the old buffer */
1215		    printf("%.*s", diff, &current[lastcol-start]);
1216		}
1217		else
1218		{
1219		    /* use cursor addressing */
1220		    Move_to(newcol, line);
1221		    cursor_on_line = Yes;
1222		}
1223		/* remember where the cursor is */
1224		lastcol = newcol + 1;
1225	    }
1226	    else
1227	    {
1228		/* already there, update position */
1229		lastcol++;
1230	    }
1231
1232	    /* write what we need to */
1233	    if (ch == '\0')
1234	    {
1235		/* at the end--terminate with a clear-to-end-of-line */
1236		(void) clear_eol(strlen(old));
1237	    }
1238	    else
1239	    {
1240		/* write the new character */
1241		putchar(ch);
1242	    }
1243	    /* put the new character in the screen buffer */
1244	    *old = ch;
1245	}
1246
1247	/* update working column and screen buffer pointer */
1248	newcol++;
1249	old++;
1250
1251    } while (ch != '\0');
1252
1253    /* zero out the rest of the line buffer -- MUST BE DONE! */
1254    diff = display_width - newcol;
1255    if (diff > 0)
1256    {
1257	memzero(old, diff);
1258    }
1259
1260    /* remember where the current line is */
1261    if (cursor_on_line)
1262    {
1263	lastline = line;
1264    }
1265}
1266
1267/*
1268 *  printable(str) - make the string pointed to by "str" into one that is
1269 *	printable (i.e.: all ascii), by converting all non-printable
1270 *	characters into '?'.  Replacements are done in place and a pointer
1271 *	to the original buffer is returned.
1272 */
1273
1274char *printable(str)
1275
1276char *str;
1277
1278{
1279    register char *ptr;
1280    register char ch;
1281
1282    ptr = str;
1283    while ((ch = *ptr) != '\0')
1284    {
1285	if (!isprint(ch))
1286	{
1287	    *ptr = '?';
1288	}
1289	ptr++;
1290    }
1291    return(str);
1292}
1293
1294i_uptime(bt, tod)
1295
1296struct timeval* bt;
1297time_t *tod;
1298
1299{
1300    time_t uptime;
1301    int days, hrs, mins, secs;
1302
1303    if (bt->tv_sec != -1) {
1304	uptime = *tod - bt->tv_sec;
1305	days = uptime / 86400;
1306	uptime %= 86400;
1307	hrs = uptime / 3600;
1308	uptime %= 3600;
1309	mins = uptime / 60;
1310	secs = uptime % 60;
1311
1312	/*
1313	 *  Display the uptime.
1314	 */
1315
1316	if (smart_terminal)
1317	{
1318	    Move_to((screen_width - 24) - (days > 9 ? 1 : 0), 0);
1319	}
1320	else
1321	{
1322	    fputs(" ", stdout);
1323	}
1324	printf(" up %d+%02d:%02d:%02d", days, hrs, mins, secs);
1325    }
1326}
1327