display.c revision 218171 
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 218171 2011-02-01 15:48:27Z 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_init(statics)
155
156struct statics *statics;
157
158{
159    register int lines;
160    register char **pp;
161    register int *ip;
162    register int i;
163
164    /* call resize to do the dirty work */
165    lines = display_resize();
166    num_cpus = statics->ncpus;
167    cpustates_column = 5;	/* CPU: */
168    if (num_cpus != 1)
169    cpustates_column += 2;	/* CPU 0: */
170    for (i = num_cpus; i > 9; i /= 10)
171	cpustates_column++;
172
173    /* only do the rest if we need to */
174    if (lines > -1)
175    {
176	/* save pointers and allocate space for names */
177	procstate_names = statics->procstate_names;
178	num_procstates = string_count(procstate_names);
179	lprocstates = (int *)malloc(num_procstates * sizeof(int));
180
181	cpustate_names = statics->cpustate_names;
182
183	swap_names = statics->swap_names;
184	num_swap = string_count(swap_names);
185	lswap = (int *)malloc(num_swap * sizeof(int));
186	num_cpustates = string_count(cpustate_names);
187	lcpustates = (int *)malloc(num_cpustates * sizeof(int) * num_cpus);
188	cpustate_columns = (int *)malloc(num_cpustates * sizeof(int));
189
190	memory_names = statics->memory_names;
191	num_memory = string_count(memory_names);
192	lmemory = (int *)malloc(num_memory * sizeof(int));
193
194	/* calculate starting columns where needed */
195	cpustate_total_length = 0;
196	pp = cpustate_names;
197	ip = cpustate_columns;
198	while (*pp != NULL)
199	{
200	    *ip++ = cpustate_total_length;
201	    if ((i = strlen(*pp++)) > 0)
202	    {
203		cpustate_total_length += i + 8;
204	    }
205	}
206    }
207
208    /* return number of lines available */
209    return(lines);
210}
211
212i_loadave(mpid, avenrun)
213
214int mpid;
215double *avenrun;
216
217{
218    register int i;
219
220    /* i_loadave also clears the screen, since it is first */
221    clear();
222
223    /* mpid == -1 implies this system doesn't have an _mpid */
224    if (mpid != -1)
225    {
226	printf("last pid: %5d;  ", mpid);
227    }
228
229    printf("load averages");
230
231    for (i = 0; i < 3; i++)
232    {
233	printf("%c %5.2f",
234	    i == 0 ? ':' : ',',
235	    avenrun[i]);
236    }
237    lmpid = mpid;
238}
239
240u_loadave(mpid, avenrun)
241
242int mpid;
243double *avenrun;
244
245{
246    register int i;
247
248    if (mpid != -1)
249    {
250	/* change screen only when value has really changed */
251	if (mpid != lmpid)
252	{
253	    Move_to(x_lastpid, y_lastpid);
254	    printf("%5d", mpid);
255	    lmpid = mpid;
256	}
257
258	/* i remembers x coordinate to move to */
259	i = x_loadave;
260    }
261    else
262    {
263	i = x_loadave_nompid;
264    }
265
266    /* move into position for load averages */
267    Move_to(i, y_loadave);
268
269    /* display new load averages */
270    /* we should optimize this and only display changes */
271    for (i = 0; i < 3; i++)
272    {
273	printf("%s%5.2f",
274	    i == 0 ? "" : ", ",
275	    avenrun[i]);
276    }
277}
278
279i_timeofday(tod)
280
281time_t *tod;
282
283{
284    /*
285     *  Display the current time.
286     *  "ctime" always returns a string that looks like this:
287     *
288     *	Sun Sep 16 01:03:52 1973
289     *      012345678901234567890123
290     *	          1         2
291     *
292     *  We want indices 11 thru 18 (length 8).
293     */
294
295    if (smart_terminal)
296    {
297	Move_to(screen_width - 8, 0);
298    }
299    else
300    {
301	fputs("    ", stdout);
302    }
303#ifdef DEBUG
304    {
305	char *foo;
306	foo = ctime(tod);
307	fputs(foo, stdout);
308    }
309#endif
310    printf("%-8.8s\n", &(ctime(tod)[11]));
311    lastline = 1;
312}
313
314static int ltotal = 0;
315static char procstates_buffer[MAX_COLS];
316
317/*
318 *  *_procstates(total, brkdn, names) - print the process summary line
319 *
320 *  Assumptions:  cursor is at the beginning of the line on entry
321 *		  lastline is valid
322 */
323
324i_procstates(total, brkdn)
325
326int total;
327int *brkdn;
328
329{
330    register int i;
331
332    /* write current number of processes and remember the value */
333    printf("%d processes:", total);
334    ltotal = total;
335
336    /* put out enough spaces to get to column 15 */
337    i = digits(total);
338    while (i++ < 4)
339    {
340	putchar(' ');
341    }
342
343    /* format and print the process state summary */
344    summary_format(procstates_buffer, brkdn, procstate_names);
345    fputs(procstates_buffer, stdout);
346
347    /* save the numbers for next time */
348    memcpy(lprocstates, brkdn, num_procstates * sizeof(int));
349}
350
351u_procstates(total, brkdn)
352
353int total;
354int *brkdn;
355
356{
357    static char new[MAX_COLS];
358    register int i;
359
360    /* update number of processes only if it has changed */
361    if (ltotal != total)
362    {
363	/* move and overwrite */
364#if (x_procstate == 0)
365	Move_to(x_procstate, y_procstate);
366#else
367	/* cursor is already there...no motion needed */
368	/* assert(lastline == 1); */
369#endif
370	printf("%d", total);
371
372	/* if number of digits differs, rewrite the label */
373	if (digits(total) != digits(ltotal))
374	{
375	    fputs(" processes:", stdout);
376	    /* put out enough spaces to get to column 15 */
377	    i = digits(total);
378	    while (i++ < 4)
379	    {
380		putchar(' ');
381	    }
382	    /* cursor may end up right where we want it!!! */
383	}
384
385	/* save new total */
386	ltotal = total;
387    }
388
389    /* see if any of the state numbers has changed */
390    if (memcmp(lprocstates, brkdn, num_procstates * sizeof(int)) != 0)
391    {
392	/* format and update the line */
393	summary_format(new, brkdn, procstate_names);
394	line_update(procstates_buffer, new, x_brkdn, y_brkdn);
395	memcpy(lprocstates, brkdn, num_procstates * sizeof(int));
396    }
397}
398
399#ifdef no_more
400/*
401 *  *_cpustates(states, names) - print the cpu state percentages
402 *
403 *  Assumptions:  cursor is on the PREVIOUS line
404 */
405
406/* cpustates_tag() calculates the correct tag to use to label the line */
407
408char *cpustates_tag()
409
410{
411    register char *use;
412
413    static char *short_tag = "CPU: ";
414    static char *long_tag = "CPU states: ";
415
416    /* if length + strlen(long_tag) >= screen_width, then we have to
417       use the shorter tag (we subtract 2 to account for ": ") */
418    if (cpustate_total_length + (int)strlen(long_tag) - 2 >= screen_width)
419    {
420	use = short_tag;
421    }
422    else
423    {
424	use = long_tag;
425    }
426
427    /* set cpustates_column accordingly then return result */
428    cpustates_column = strlen(use);
429    return(use);
430}
431#endif
432
433i_cpustates(states)
434
435register int *states;
436
437{
438    register int i = 0;
439    register int value;
440    register char **names;
441    register char *thisname;
442    int cpu;
443
444for (cpu = 0; cpu < num_cpus; cpu++) {
445    names = cpustate_names;
446
447    /* print tag and bump lastline */
448    if (num_cpus == 1)
449	printf("\nCPU: ");
450    else {
451	value = printf("\nCPU %d: ", cpu);
452	while (value++ <= cpustates_column)
453		printf(" ");
454    }
455    lastline++;
456
457    /* now walk thru the names and print the line */
458    while ((thisname = *names++) != NULL)
459    {
460	if (*thisname != '\0')
461	{
462	    /* retrieve the value and remember it */
463	    value = *states++;
464
465	    /* if percentage is >= 1000, print it as 100% */
466	    printf((value >= 1000 ? "%s%4.0f%% %s" : "%s%4.1f%% %s"),
467		   (i++ % num_cpustates) == 0 ? "" : ", ",
468		   ((float)value)/10.,
469		   thisname);
470	}
471    }
472}
473
474    /* copy over values into "last" array */
475    memcpy(lcpustates, states, num_cpustates * sizeof(int) * num_cpus);
476}
477
478u_cpustates(states)
479
480register int *states;
481
482{
483    register int value;
484    register char **names;
485    register char *thisname;
486    register int *lp;
487    register int *colp;
488    int cpu;
489
490for (cpu = 0; cpu < num_cpus; cpu++) {
491    names = cpustate_names;
492
493    Move_to(cpustates_column, y_cpustates + cpu);
494    lastline = y_cpustates + cpu;
495    lp = lcpustates + (cpu * num_cpustates);
496    colp = cpustate_columns;
497
498    /* we could be much more optimal about this */
499    while ((thisname = *names++) != NULL)
500    {
501	if (*thisname != '\0')
502	{
503	    /* did the value change since last time? */
504	    if (*lp != *states)
505	    {
506		/* yes, move and change */
507		Move_to(cpustates_column + *colp, y_cpustates + cpu);
508		lastline = y_cpustates + cpu;
509
510		/* retrieve value and remember it */
511		value = *states;
512
513		/* if percentage is >= 1000, print it as 100% */
514		printf((value >= 1000 ? "%4.0f" : "%4.1f"),
515		       ((double)value)/10.);
516
517		/* remember it for next time */
518		*lp = value;
519	    }
520	}
521
522	/* increment and move on */
523	lp++;
524	states++;
525	colp++;
526    }
527}
528}
529
530z_cpustates()
531
532{
533    register int i = 0;
534    register char **names;
535    register char *thisname;
536    register int *lp;
537    int cpu, value;
538
539for (cpu = 0; cpu < num_cpus; cpu++) {
540    names = cpustate_names;
541
542    /* show tag and bump lastline */
543    if (num_cpus == 1)
544	printf("\nCPU: ");
545    else {
546	value = printf("\nCPU %d: ", cpu);
547	while (value++ <= cpustates_column)
548		printf(" ");
549    }
550    lastline++;
551
552    while ((thisname = *names++) != NULL)
553    {
554	if (*thisname != '\0')
555	{
556	    printf("%s    %% %s", (i++ % num_cpustates) == 0 ? "" : ", ", thisname);
557	}
558    }
559}
560
561    /* fill the "last" array with all -1s, to insure correct updating */
562    lp = lcpustates;
563    i = num_cpustates * num_cpus;
564    while (--i >= 0)
565    {
566	*lp++ = -1;
567    }
568}
569
570/*
571 *  *_memory(stats) - print "Memory: " followed by the memory summary string
572 *
573 *  Assumptions:  cursor is on "lastline"
574 *                for i_memory ONLY: cursor is on the previous line
575 */
576
577char memory_buffer[MAX_COLS];
578
579i_memory(stats)
580
581int *stats;
582
583{
584    fputs("\nMem: ", stdout);
585    lastline++;
586
587    /* format and print the memory summary */
588    summary_format(memory_buffer, stats, memory_names);
589    fputs(memory_buffer, stdout);
590}
591
592u_memory(stats)
593
594int *stats;
595
596{
597    static char new[MAX_COLS];
598
599    /* format the new line */
600    summary_format(new, stats, memory_names);
601    line_update(memory_buffer, new, x_mem, y_mem);
602}
603
604/*
605 *  *_swap(stats) - print "Swap: " followed by the swap summary string
606 *
607 *  Assumptions:  cursor is on "lastline"
608 *                for i_swap ONLY: cursor is on the previous line
609 */
610
611char swap_buffer[MAX_COLS];
612
613i_swap(stats)
614
615int *stats;
616
617{
618    fputs("\nSwap: ", stdout);
619    lastline++;
620
621    /* format and print the swap summary */
622    summary_format(swap_buffer, stats, swap_names);
623    fputs(swap_buffer, stdout);
624}
625
626u_swap(stats)
627
628int *stats;
629
630{
631    static char new[MAX_COLS];
632
633    /* format the new line */
634    summary_format(new, stats, swap_names);
635    line_update(swap_buffer, new, x_swap, y_swap);
636}
637
638/*
639 *  *_message() - print the next pending message line, or erase the one
640 *                that is there.
641 *
642 *  Note that u_message is (currently) the same as i_message.
643 *
644 *  Assumptions:  lastline is consistent
645 */
646
647/*
648 *  i_message is funny because it gets its message asynchronously (with
649 *	respect to screen updates).
650 */
651
652static char next_msg[MAX_COLS + 5];
653static int msglen = 0;
654/* Invariant: msglen is always the length of the message currently displayed
655   on the screen (even when next_msg doesn't contain that message). */
656
657i_message()
658
659{
660    while (lastline < y_message)
661    {
662	fputc('\n', stdout);
663	lastline++;
664    }
665    if (next_msg[0] != '\0')
666    {
667	standout(next_msg);
668	msglen = strlen(next_msg);
669	next_msg[0] = '\0';
670    }
671    else if (msglen > 0)
672    {
673	(void) clear_eol(msglen);
674	msglen = 0;
675    }
676}
677
678u_message()
679
680{
681    i_message();
682}
683
684static int header_length;
685
686/*
687 * Trim a header string to the current display width and return a newly
688 * allocated area with the trimmed header.
689 */
690
691char *
692trim_header(text)
693
694char *text;
695
696{
697	char *s;
698	int width;
699
700	s = NULL;
701	width = screen_width;
702	header_length = strlen(text);
703	if (header_length >= width) {
704		s = malloc((width + 1) * sizeof(char));
705		if (s == NULL)
706			return (NULL);
707		strncpy(s, text, width);
708		s[width] = '\0';
709	} else {
710		s = malloc((width + 1) * sizeof(char));
711		if (s == NULL)
712			return (NULL);
713		strncpy(s, text, width);
714		while (screen_width > header_length)
715			s[header_length++] = ' ';
716		s[width] = '\0';
717	}
718	return (s);
719}
720
721/*
722 *  *_header(text) - print the header for the process area
723 *
724 *  Assumptions:  cursor is on the previous line and lastline is consistent
725 */
726
727i_header(text)
728
729char *text;
730
731{
732    char *s;
733
734    s = trim_header(text);
735    if (s != NULL)
736	text = s;
737
738    if (header_status == ON)
739    {
740	putchar('\n');
741	standout(text, stdout);
742	lastline++;
743    }
744    else if (header_status == ERASE)
745    {
746	header_status = OFF;
747    }
748    free(s);
749}
750
751/*ARGSUSED*/
752u_header(text)
753
754char *text;		/* ignored */
755
756{
757
758    if (header_status == ERASE)
759    {
760	putchar('\n');
761	lastline++;
762	clear_eol(header_length);
763	header_status = OFF;
764    }
765}
766
767/*
768 *  *_process(line, thisline) - print one process line
769 *
770 *  Assumptions:  lastline is consistent
771 */
772
773i_process(line, thisline)
774
775int line;
776char *thisline;
777
778{
779    register char *p;
780    register char *base;
781
782    /* make sure we are on the correct line */
783    while (lastline < y_procs + line)
784    {
785	putchar('\n');
786	lastline++;
787    }
788
789    /* truncate the line to conform to our current screen width */
790    thisline[display_width] = '\0';
791
792    /* write the line out */
793    fputs(thisline, stdout);
794
795    /* copy it in to our buffer */
796    base = smart_terminal ? screenbuf + lineindex(line) : screenbuf;
797    p = strecpy(base, thisline);
798
799    /* zero fill the rest of it */
800    memzero(p, display_width - (p - base));
801}
802
803u_process(line, newline)
804
805int line;
806char *newline;
807
808{
809    register char *optr;
810    register int screen_line = line + Header_lines;
811    register char *bufferline;
812
813    /* remember a pointer to the current line in the screen buffer */
814    bufferline = &screenbuf[lineindex(line)];
815
816    /* truncate the line to conform to our current screen width */
817    newline[display_width] = '\0';
818
819    /* is line higher than we went on the last display? */
820    if (line >= last_hi)
821    {
822	/* yes, just ignore screenbuf and write it out directly */
823	/* get positioned on the correct line */
824	if (screen_line - lastline == 1)
825	{
826	    putchar('\n');
827	    lastline++;
828	}
829	else
830	{
831	    Move_to(0, screen_line);
832	    lastline = screen_line;
833	}
834
835	/* now write the line */
836	fputs(newline, stdout);
837
838	/* copy it in to the buffer */
839	optr = strecpy(bufferline, newline);
840
841	/* zero fill the rest of it */
842	memzero(optr, display_width - (optr - bufferline));
843    }
844    else
845    {
846	line_update(bufferline, newline, 0, line + Header_lines);
847    }
848}
849
850u_endscreen(hi)
851
852register int hi;
853
854{
855    register int screen_line = hi + Header_lines;
856    register int i;
857
858    if (smart_terminal)
859    {
860	if (hi < last_hi)
861	{
862	    /* need to blank the remainder of the screen */
863	    /* but only if there is any screen left below this line */
864	    if (lastline + 1 < screen_length)
865	    {
866		/* efficiently move to the end of currently displayed info */
867		if (screen_line - lastline < 5)
868		{
869		    while (lastline < screen_line)
870		    {
871			putchar('\n');
872			lastline++;
873		    }
874		}
875		else
876		{
877		    Move_to(0, screen_line);
878		    lastline = screen_line;
879		}
880
881		if (clear_to_end)
882		{
883		    /* we can do this the easy way */
884		    putcap(clear_to_end);
885		}
886		else
887		{
888		    /* use clear_eol on each line */
889		    i = hi;
890		    while ((void) clear_eol(strlen(&screenbuf[lineindex(i++)])), i < last_hi)
891		    {
892			putchar('\n');
893		    }
894		}
895	    }
896	}
897	last_hi = hi;
898
899	/* move the cursor to a pleasant place */
900	Move_to(x_idlecursor, y_idlecursor);
901	lastline = y_idlecursor;
902    }
903    else
904    {
905	/* separate this display from the next with some vertical room */
906	fputs("\n\n", stdout);
907    }
908}
909
910display_header(t)
911
912int t;
913
914{
915    if (t)
916    {
917	header_status = ON;
918    }
919    else if (header_status == ON)
920    {
921	header_status = ERASE;
922    }
923}
924
925/*VARARGS2*/
926new_message(type, msgfmt, a1, a2, a3)
927
928int type;
929char *msgfmt;
930caddr_t a1, a2, a3;
931
932{
933    register int i;
934
935    /* first, format the message */
936    (void) snprintf(next_msg, sizeof(next_msg), msgfmt, a1, a2, a3);
937
938    if (msglen > 0)
939    {
940	/* message there already -- can we clear it? */
941	if (!overstrike)
942	{
943	    /* yes -- write it and clear to end */
944	    i = strlen(next_msg);
945	    if ((type & MT_delayed) == 0)
946	    {
947		type & MT_standout ? standout(next_msg) :
948		                     fputs(next_msg, stdout);
949		(void) clear_eol(msglen - i);
950		msglen = i;
951		next_msg[0] = '\0';
952	    }
953	}
954    }
955    else
956    {
957	if ((type & MT_delayed) == 0)
958	{
959	    type & MT_standout ? standout(next_msg) : fputs(next_msg, stdout);
960	    msglen = strlen(next_msg);
961	    next_msg[0] = '\0';
962	}
963    }
964}
965
966clear_message()
967
968{
969    if (clear_eol(msglen) == 1)
970    {
971	putchar('\r');
972    }
973}
974
975readline(buffer, size, numeric)
976
977char *buffer;
978int  size;
979int  numeric;
980
981{
982    register char *ptr = buffer;
983    register char ch;
984    register char cnt = 0;
985    register char maxcnt = 0;
986
987    /* allow room for null terminator */
988    size -= 1;
989
990    /* read loop */
991    while ((fflush(stdout), read(0, ptr, 1) > 0))
992    {
993	/* newline means we are done */
994	if ((ch = *ptr) == '\n' || ch == '\r')
995	{
996	    break;
997	}
998
999	/* handle special editing characters */
1000	if (ch == ch_kill)
1001	{
1002	    /* kill line -- account for overstriking */
1003	    if (overstrike)
1004	    {
1005		msglen += maxcnt;
1006	    }
1007
1008	    /* return null string */
1009	    *buffer = '\0';
1010	    putchar('\r');
1011	    return(-1);
1012	}
1013	else if (ch == ch_erase)
1014	{
1015	    /* erase previous character */
1016	    if (cnt <= 0)
1017	    {
1018		/* none to erase! */
1019		putchar('\7');
1020	    }
1021	    else
1022	    {
1023		fputs("\b \b", stdout);
1024		ptr--;
1025		cnt--;
1026	    }
1027	}
1028	/* check for character validity and buffer overflow */
1029	else if (cnt == size || (numeric && !isdigit(ch)) ||
1030		!isprint(ch))
1031	{
1032	    /* not legal */
1033	    putchar('\7');
1034	}
1035	else
1036	{
1037	    /* echo it and store it in the buffer */
1038	    putchar(ch);
1039	    ptr++;
1040	    cnt++;
1041	    if (cnt > maxcnt)
1042	    {
1043		maxcnt = cnt;
1044	    }
1045	}
1046    }
1047
1048    /* all done -- null terminate the string */
1049    *ptr = '\0';
1050
1051    /* account for the extra characters in the message area */
1052    /* (if terminal overstrikes, remember the furthest they went) */
1053    msglen += overstrike ? maxcnt : cnt;
1054
1055    /* return either inputted number or string length */
1056    putchar('\r');
1057    return(cnt == 0 ? -1 : numeric ? atoi(buffer) : cnt);
1058}
1059
1060/* internal support routines */
1061
1062static int string_count(pp)
1063
1064register char **pp;
1065
1066{
1067    register int cnt;
1068
1069    cnt = 0;
1070    while (*pp++ != NULL)
1071    {
1072	cnt++;
1073    }
1074    return(cnt);
1075}
1076
1077static void summary_format(str, numbers, names)
1078
1079char *str;
1080int *numbers;
1081register char **names;
1082
1083{
1084    register char *p;
1085    register int num;
1086    register char *thisname;
1087    register int useM = No;
1088
1089    /* format each number followed by its string */
1090    p = str;
1091    while ((thisname = *names++) != NULL)
1092    {
1093	/* get the number to format */
1094	num = *numbers++;
1095
1096	/* display only non-zero numbers */
1097	if (num > 0)
1098	{
1099	    /* is this number in kilobytes? */
1100	    if (thisname[0] == 'K')
1101	    {
1102		/* yes: format it as a memory value */
1103		p = strecpy(p, format_k(num));
1104
1105		/* skip over the K, since it was included by format_k */
1106		p = strecpy(p, thisname+1);
1107	    }
1108	    else
1109	    {
1110		p = strecpy(p, itoa(num));
1111		p = strecpy(p, thisname);
1112	    }
1113	}
1114
1115	/* ignore negative numbers, but display corresponding string */
1116	else if (num < 0)
1117	{
1118	    p = strecpy(p, thisname);
1119	}
1120    }
1121
1122    /* if the last two characters in the string are ", ", delete them */
1123    p -= 2;
1124    if (p >= str && p[0] == ',' && p[1] == ' ')
1125    {
1126	*p = '\0';
1127    }
1128}
1129
1130static void line_update(old, new, start, line)
1131
1132register char *old;
1133register char *new;
1134int start;
1135int line;
1136
1137{
1138    register int ch;
1139    register int diff;
1140    register int newcol = start + 1;
1141    register int lastcol = start;
1142    char cursor_on_line = No;
1143    char *current;
1144
1145    /* compare the two strings and only rewrite what has changed */
1146    current = old;
1147#ifdef DEBUG
1148    fprintf(debug, "line_update, starting at %d\n", start);
1149    fputs(old, debug);
1150    fputc('\n', debug);
1151    fputs(new, debug);
1152    fputs("\n-\n", debug);
1153#endif
1154
1155    /* start things off on the right foot		    */
1156    /* this is to make sure the invariants get set up right */
1157    if ((ch = *new++) != *old)
1158    {
1159	if (line - lastline == 1 && start == 0)
1160	{
1161	    putchar('\n');
1162	}
1163	else
1164	{
1165	    Move_to(start, line);
1166	}
1167	cursor_on_line = Yes;
1168	putchar(ch);
1169	*old = ch;
1170	lastcol = 1;
1171    }
1172    old++;
1173
1174    /*
1175     *  main loop -- check each character.  If the old and new aren't the
1176     *	same, then update the display.  When the distance from the
1177     *	current cursor position to the new change is small enough,
1178     *	the characters that belong there are written to move the
1179     *	cursor over.
1180     *
1181     *	Invariants:
1182     *	    lastcol is the column where the cursor currently is sitting
1183     *		(always one beyond the end of the last mismatch).
1184     */
1185    do		/* yes, a do...while */
1186    {
1187	if ((ch = *new++) != *old)
1188	{
1189	    /* new character is different from old	  */
1190	    /* make sure the cursor is on top of this character */
1191	    diff = newcol - lastcol;
1192	    if (diff > 0)
1193	    {
1194		/* some motion is required--figure out which is shorter */
1195		if (diff < 6 && cursor_on_line)
1196		{
1197		    /* overwrite old stuff--get it out of the old buffer */
1198		    printf("%.*s", diff, &current[lastcol-start]);
1199		}
1200		else
1201		{
1202		    /* use cursor addressing */
1203		    Move_to(newcol, line);
1204		    cursor_on_line = Yes;
1205		}
1206		/* remember where the cursor is */
1207		lastcol = newcol + 1;
1208	    }
1209	    else
1210	    {
1211		/* already there, update position */
1212		lastcol++;
1213	    }
1214
1215	    /* write what we need to */
1216	    if (ch == '\0')
1217	    {
1218		/* at the end--terminate with a clear-to-end-of-line */
1219		(void) clear_eol(strlen(old));
1220	    }
1221	    else
1222	    {
1223		/* write the new character */
1224		putchar(ch);
1225	    }
1226	    /* put the new character in the screen buffer */
1227	    *old = ch;
1228	}
1229
1230	/* update working column and screen buffer pointer */
1231	newcol++;
1232	old++;
1233
1234    } while (ch != '\0');
1235
1236    /* zero out the rest of the line buffer -- MUST BE DONE! */
1237    diff = display_width - newcol;
1238    if (diff > 0)
1239    {
1240	memzero(old, diff);
1241    }
1242
1243    /* remember where the current line is */
1244    if (cursor_on_line)
1245    {
1246	lastline = line;
1247    }
1248}
1249
1250/*
1251 *  printable(str) - make the string pointed to by "str" into one that is
1252 *	printable (i.e.: all ascii), by converting all non-printable
1253 *	characters into '?'.  Replacements are done in place and a pointer
1254 *	to the original buffer is returned.
1255 */
1256
1257char *printable(str)
1258
1259char *str;
1260
1261{
1262    register char *ptr;
1263    register char ch;
1264
1265    ptr = str;
1266    while ((ch = *ptr) != '\0')
1267    {
1268	if (!isprint(ch))
1269	{
1270	    *ptr = '?';
1271	}
1272	ptr++;
1273    }
1274    return(str);
1275}
1276
1277i_uptime(bt, tod)
1278
1279struct timeval* bt;
1280time_t *tod;
1281
1282{
1283    time_t uptime;
1284    int days, hrs, mins, secs;
1285
1286    if (bt->tv_sec != -1) {
1287	uptime = *tod - bt->tv_sec;
1288	days = uptime / 86400;
1289	uptime %= 86400;
1290	hrs = uptime / 3600;
1291	uptime %= 3600;
1292	mins = uptime / 60;
1293	secs = uptime % 60;
1294
1295	/*
1296	 *  Display the uptime.
1297	 */
1298
1299	if (smart_terminal)
1300	{
1301	    Move_to((screen_width - 24) - (days > 9 ? 1 : 0), 0);
1302	}
1303	else
1304	{
1305	    fputs(" ", stdout);
1306	}
1307	printf(" up %d+%02d:%02d:%02d", days, hrs, mins, secs);
1308    }
1309}
1310