display.c revision 223342 
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 223342 2011-06-20 16:48:00Z delphij $
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 = display_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	}
710	return (s);
711}
712
713/*
714 *  *_header(text) - print the header for the process area
715 *
716 *  Assumptions:  cursor is on the previous line and lastline is consistent
717 */
718
719i_header(text)
720
721char *text;
722
723{
724    char *s;
725
726    s = trim_header(text);
727    if (s != NULL)
728	text = s;
729
730    if (header_status == ON)
731    {
732	putchar('\n');
733	fputs(text, stdout);
734	lastline++;
735    }
736    else if (header_status == ERASE)
737    {
738	header_status = OFF;
739    }
740    free(s);
741}
742
743/*ARGSUSED*/
744u_header(text)
745
746char *text;		/* ignored */
747
748{
749
750    if (header_status == ERASE)
751    {
752	putchar('\n');
753	lastline++;
754	clear_eol(header_length);
755	header_status = OFF;
756    }
757}
758
759/*
760 *  *_process(line, thisline) - print one process line
761 *
762 *  Assumptions:  lastline is consistent
763 */
764
765i_process(line, thisline)
766
767int line;
768char *thisline;
769
770{
771    register char *p;
772    register char *base;
773
774    /* make sure we are on the correct line */
775    while (lastline < y_procs + line)
776    {
777	putchar('\n');
778	lastline++;
779    }
780
781    /* truncate the line to conform to our current screen width */
782    thisline[display_width] = '\0';
783
784    /* write the line out */
785    fputs(thisline, stdout);
786
787    /* copy it in to our buffer */
788    base = smart_terminal ? screenbuf + lineindex(line) : screenbuf;
789    p = strecpy(base, thisline);
790
791    /* zero fill the rest of it */
792    memzero(p, display_width - (p - base));
793}
794
795u_process(line, newline)
796
797int line;
798char *newline;
799
800{
801    register char *optr;
802    register int screen_line = line + Header_lines;
803    register char *bufferline;
804
805    /* remember a pointer to the current line in the screen buffer */
806    bufferline = &screenbuf[lineindex(line)];
807
808    /* truncate the line to conform to our current screen width */
809    newline[display_width] = '\0';
810
811    /* is line higher than we went on the last display? */
812    if (line >= last_hi)
813    {
814	/* yes, just ignore screenbuf and write it out directly */
815	/* get positioned on the correct line */
816	if (screen_line - lastline == 1)
817	{
818	    putchar('\n');
819	    lastline++;
820	}
821	else
822	{
823	    Move_to(0, screen_line);
824	    lastline = screen_line;
825	}
826
827	/* now write the line */
828	fputs(newline, stdout);
829
830	/* copy it in to the buffer */
831	optr = strecpy(bufferline, newline);
832
833	/* zero fill the rest of it */
834	memzero(optr, display_width - (optr - bufferline));
835    }
836    else
837    {
838	line_update(bufferline, newline, 0, line + Header_lines);
839    }
840}
841
842u_endscreen(hi)
843
844register int hi;
845
846{
847    register int screen_line = hi + Header_lines;
848    register int i;
849
850    if (smart_terminal)
851    {
852	if (hi < last_hi)
853	{
854	    /* need to blank the remainder of the screen */
855	    /* but only if there is any screen left below this line */
856	    if (lastline + 1 < screen_length)
857	    {
858		/* efficiently move to the end of currently displayed info */
859		if (screen_line - lastline < 5)
860		{
861		    while (lastline < screen_line)
862		    {
863			putchar('\n');
864			lastline++;
865		    }
866		}
867		else
868		{
869		    Move_to(0, screen_line);
870		    lastline = screen_line;
871		}
872
873		if (clear_to_end)
874		{
875		    /* we can do this the easy way */
876		    putcap(clear_to_end);
877		}
878		else
879		{
880		    /* use clear_eol on each line */
881		    i = hi;
882		    while ((void) clear_eol(strlen(&screenbuf[lineindex(i++)])), i < last_hi)
883		    {
884			putchar('\n');
885		    }
886		}
887	    }
888	}
889	last_hi = hi;
890
891	/* move the cursor to a pleasant place */
892	Move_to(x_idlecursor, y_idlecursor);
893	lastline = y_idlecursor;
894    }
895    else
896    {
897	/* separate this display from the next with some vertical room */
898	fputs("\n\n", stdout);
899    }
900}
901
902display_header(t)
903
904int t;
905
906{
907    if (t)
908    {
909	header_status = ON;
910    }
911    else if (header_status == ON)
912    {
913	header_status = ERASE;
914    }
915}
916
917/*VARARGS2*/
918new_message(type, msgfmt, a1, a2, a3)
919
920int type;
921char *msgfmt;
922caddr_t a1, a2, a3;
923
924{
925    register int i;
926
927    /* first, format the message */
928    (void) snprintf(next_msg, sizeof(next_msg), msgfmt, a1, a2, a3);
929
930    if (msglen > 0)
931    {
932	/* message there already -- can we clear it? */
933	if (!overstrike)
934	{
935	    /* yes -- write it and clear to end */
936	    i = strlen(next_msg);
937	    if ((type & MT_delayed) == 0)
938	    {
939		type & MT_standout ? standout(next_msg) :
940		                     fputs(next_msg, stdout);
941		(void) clear_eol(msglen - i);
942		msglen = i;
943		next_msg[0] = '\0';
944	    }
945	}
946    }
947    else
948    {
949	if ((type & MT_delayed) == 0)
950	{
951	    type & MT_standout ? standout(next_msg) : fputs(next_msg, stdout);
952	    msglen = strlen(next_msg);
953	    next_msg[0] = '\0';
954	}
955    }
956}
957
958clear_message()
959
960{
961    if (clear_eol(msglen) == 1)
962    {
963	putchar('\r');
964    }
965}
966
967readline(buffer, size, numeric)
968
969char *buffer;
970int  size;
971int  numeric;
972
973{
974    register char *ptr = buffer;
975    register char ch;
976    register char cnt = 0;
977    register char maxcnt = 0;
978
979    /* allow room for null terminator */
980    size -= 1;
981
982    /* read loop */
983    while ((fflush(stdout), read(0, ptr, 1) > 0))
984    {
985	/* newline means we are done */
986	if ((ch = *ptr) == '\n' || ch == '\r')
987	{
988	    break;
989	}
990
991	/* handle special editing characters */
992	if (ch == ch_kill)
993	{
994	    /* kill line -- account for overstriking */
995	    if (overstrike)
996	    {
997		msglen += maxcnt;
998	    }
999
1000	    /* return null string */
1001	    *buffer = '\0';
1002	    putchar('\r');
1003	    return(-1);
1004	}
1005	else if (ch == ch_erase)
1006	{
1007	    /* erase previous character */
1008	    if (cnt <= 0)
1009	    {
1010		/* none to erase! */
1011		putchar('\7');
1012	    }
1013	    else
1014	    {
1015		fputs("\b \b", stdout);
1016		ptr--;
1017		cnt--;
1018	    }
1019	}
1020	/* check for character validity and buffer overflow */
1021	else if (cnt == size || (numeric && !isdigit(ch)) ||
1022		!isprint(ch))
1023	{
1024	    /* not legal */
1025	    putchar('\7');
1026	}
1027	else
1028	{
1029	    /* echo it and store it in the buffer */
1030	    putchar(ch);
1031	    ptr++;
1032	    cnt++;
1033	    if (cnt > maxcnt)
1034	    {
1035		maxcnt = cnt;
1036	    }
1037	}
1038    }
1039
1040    /* all done -- null terminate the string */
1041    *ptr = '\0';
1042
1043    /* account for the extra characters in the message area */
1044    /* (if terminal overstrikes, remember the furthest they went) */
1045    msglen += overstrike ? maxcnt : cnt;
1046
1047    /* return either inputted number or string length */
1048    putchar('\r');
1049    return(cnt == 0 ? -1 : numeric ? atoi(buffer) : cnt);
1050}
1051
1052/* internal support routines */
1053
1054static int string_count(pp)
1055
1056register char **pp;
1057
1058{
1059    register int cnt;
1060
1061    cnt = 0;
1062    while (*pp++ != NULL)
1063    {
1064	cnt++;
1065    }
1066    return(cnt);
1067}
1068
1069static void summary_format(str, numbers, names)
1070
1071char *str;
1072int *numbers;
1073register char **names;
1074
1075{
1076    register char *p;
1077    register int num;
1078    register char *thisname;
1079    register int useM = No;
1080
1081    /* format each number followed by its string */
1082    p = str;
1083    while ((thisname = *names++) != NULL)
1084    {
1085	/* get the number to format */
1086	num = *numbers++;
1087
1088	/* display only non-zero numbers */
1089	if (num > 0)
1090	{
1091	    /* is this number in kilobytes? */
1092	    if (thisname[0] == 'K')
1093	    {
1094		/* yes: format it as a memory value */
1095		p = strecpy(p, format_k(num));
1096
1097		/* skip over the K, since it was included by format_k */
1098		p = strecpy(p, thisname+1);
1099	    }
1100	    else
1101	    {
1102		p = strecpy(p, itoa(num));
1103		p = strecpy(p, thisname);
1104	    }
1105	}
1106
1107	/* ignore negative numbers, but display corresponding string */
1108	else if (num < 0)
1109	{
1110	    p = strecpy(p, thisname);
1111	}
1112    }
1113
1114    /* if the last two characters in the string are ", ", delete them */
1115    p -= 2;
1116    if (p >= str && p[0] == ',' && p[1] == ' ')
1117    {
1118	*p = '\0';
1119    }
1120}
1121
1122static void line_update(old, new, start, line)
1123
1124register char *old;
1125register char *new;
1126int start;
1127int line;
1128
1129{
1130    register int ch;
1131    register int diff;
1132    register int newcol = start + 1;
1133    register int lastcol = start;
1134    char cursor_on_line = No;
1135    char *current;
1136
1137    /* compare the two strings and only rewrite what has changed */
1138    current = old;
1139#ifdef DEBUG
1140    fprintf(debug, "line_update, starting at %d\n", start);
1141    fputs(old, debug);
1142    fputc('\n', debug);
1143    fputs(new, debug);
1144    fputs("\n-\n", debug);
1145#endif
1146
1147    /* start things off on the right foot		    */
1148    /* this is to make sure the invariants get set up right */
1149    if ((ch = *new++) != *old)
1150    {
1151	if (line - lastline == 1 && start == 0)
1152	{
1153	    putchar('\n');
1154	}
1155	else
1156	{
1157	    Move_to(start, line);
1158	}
1159	cursor_on_line = Yes;
1160	putchar(ch);
1161	*old = ch;
1162	lastcol = 1;
1163    }
1164    old++;
1165
1166    /*
1167     *  main loop -- check each character.  If the old and new aren't the
1168     *	same, then update the display.  When the distance from the
1169     *	current cursor position to the new change is small enough,
1170     *	the characters that belong there are written to move the
1171     *	cursor over.
1172     *
1173     *	Invariants:
1174     *	    lastcol is the column where the cursor currently is sitting
1175     *		(always one beyond the end of the last mismatch).
1176     */
1177    do		/* yes, a do...while */
1178    {
1179	if ((ch = *new++) != *old)
1180	{
1181	    /* new character is different from old	  */
1182	    /* make sure the cursor is on top of this character */
1183	    diff = newcol - lastcol;
1184	    if (diff > 0)
1185	    {
1186		/* some motion is required--figure out which is shorter */
1187		if (diff < 6 && cursor_on_line)
1188		{
1189		    /* overwrite old stuff--get it out of the old buffer */
1190		    printf("%.*s", diff, &current[lastcol-start]);
1191		}
1192		else
1193		{
1194		    /* use cursor addressing */
1195		    Move_to(newcol, line);
1196		    cursor_on_line = Yes;
1197		}
1198		/* remember where the cursor is */
1199		lastcol = newcol + 1;
1200	    }
1201	    else
1202	    {
1203		/* already there, update position */
1204		lastcol++;
1205	    }
1206
1207	    /* write what we need to */
1208	    if (ch == '\0')
1209	    {
1210		/* at the end--terminate with a clear-to-end-of-line */
1211		(void) clear_eol(strlen(old));
1212	    }
1213	    else
1214	    {
1215		/* write the new character */
1216		putchar(ch);
1217	    }
1218	    /* put the new character in the screen buffer */
1219	    *old = ch;
1220	}
1221
1222	/* update working column and screen buffer pointer */
1223	newcol++;
1224	old++;
1225
1226    } while (ch != '\0');
1227
1228    /* zero out the rest of the line buffer -- MUST BE DONE! */
1229    diff = display_width - newcol;
1230    if (diff > 0)
1231    {
1232	memzero(old, diff);
1233    }
1234
1235    /* remember where the current line is */
1236    if (cursor_on_line)
1237    {
1238	lastline = line;
1239    }
1240}
1241
1242/*
1243 *  printable(str) - make the string pointed to by "str" into one that is
1244 *	printable (i.e.: all ascii), by converting all non-printable
1245 *	characters into '?'.  Replacements are done in place and a pointer
1246 *	to the original buffer is returned.
1247 */
1248
1249char *printable(str)
1250
1251char *str;
1252
1253{
1254    register char *ptr;
1255    register char ch;
1256
1257    ptr = str;
1258    while ((ch = *ptr) != '\0')
1259    {
1260	if (!isprint(ch))
1261	{
1262	    *ptr = '?';
1263	}
1264	ptr++;
1265    }
1266    return(str);
1267}
1268
1269i_uptime(bt, tod)
1270
1271struct timeval* bt;
1272time_t *tod;
1273
1274{
1275    time_t uptime;
1276    int days, hrs, mins, secs;
1277
1278    if (bt->tv_sec != -1) {
1279	uptime = *tod - bt->tv_sec;
1280	days = uptime / 86400;
1281	uptime %= 86400;
1282	hrs = uptime / 3600;
1283	uptime %= 3600;
1284	mins = uptime / 60;
1285	secs = uptime % 60;
1286
1287	/*
1288	 *  Display the uptime.
1289	 */
1290
1291	if (smart_terminal)
1292	{
1293	    Move_to((screen_width - 24) - (days > 9 ? 1 : 0), 0);
1294	}
1295	else
1296	{
1297	    fputs(" ", stdout);
1298	}
1299	printf(" up %d+%02d:%02d:%02d", days, hrs, mins, secs);
1300    }
1301}
1302