MFC r368207,368607:

[FreeBSD/stable/10.git] / contrib / top / display.c

/*
 *  Top users/processes display for Unix
 *  Version 3
 *
 *  This program may be freely redistributed,
 *  but this entire comment MUST remain intact.
 *
 *  Copyright (c) 1984, 1989, William LeFebvre, Rice University
 *  Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
 *
 * $FreeBSD$
 */

/*
 *  This file contains the routines that display information on the screen.
 *  Each section of the screen has two routines:  one for initially writing
 *  all constant and dynamic text, and one for only updating the text that
 *  changes.  The prefix "i_" is used on all the "initial" routines and the
 *  prefix "u_" is used for all the "updating" routines.
 *
 *  ASSUMPTIONS:
 *        None of the "i_" routines use any of the termcap capabilities.
 *        In this way, those routines can be safely used on terminals that
 *        have minimal (or nonexistant) terminal capabilities.
 *
 *        The routines are called in this order:  *_loadave, i_timeofday,
 *        *_procstates, *_cpustates, *_memory, *_message, *_header,
 *        *_process, u_endscreen.
 */

#include "os.h"

#include <sys/time.h>

#include <ctype.h>
#include <time.h>
#include <unistd.h>

#include "screen.h"             /* interface to screen package */
#include "layout.h"             /* defines for screen position layout */
#include "display.h"
#include "top.h"
#include "top.local.h"
#include "boolean.h"
#include "machine.h"            /* we should eliminate this!!! */
#include "utils.h"

#ifdef DEBUG
FILE *debug;
#endif

/* imported from screen.c */
extern int overstrike;

static int lmpid = 0;
static int last_hi = 0;         /* used in u_process and u_endscreen */
static int lastline = 0;
static int display_width = MAX_COLS;

#define lineindex(l) ((l)*display_width)


/* things initialized by display_init and used thruout */

/* buffer of proc information lines for display updating */
char *screenbuf = NULL;

static char **procstate_names;
static char **cpustate_names;
static char **memory_names;
static char **arc_names;
static char **swap_names;

static int num_procstates;
static int num_cpustates;
static int num_memory;
static int num_swap;

static int *lprocstates;
static int *lcpustates;
static int *lmemory;
static int *lswap;

static int num_cpus;
static int *cpustate_columns;
static int cpustate_total_length;
static int cpustates_column;

static enum { OFF, ON, ERASE } header_status = ON;

static int string_count();
static void summary_format();
static void line_update();

int  x_lastpid =        10;
int  y_lastpid =        0;
int  x_loadave =        33;
int  x_loadave_nompid = 15;
int  y_loadave =        0;
int  x_procstate =      0;
int  y_procstate =      1;
int  x_brkdn =          15;
int  y_brkdn =          1;
int  x_mem =            5;
int  y_mem =            3;
int  x_arc =            5;
int  y_arc =            4;
int  x_swap =           6;
int  y_swap =           4;
int  y_message =        5;
int  x_header =         0;
int  y_header =         6;
int  x_idlecursor =     0;
int  y_idlecursor =     5;
int  y_procs =          7;

int  y_cpustates =      2;
int  Header_lines =     7;

int display_resize()

{
    register int lines;

    /* first, deallocate any previous buffer that may have been there */
    if (screenbuf != NULL)
    {
        free(screenbuf);
    }

    /* calculate the current dimensions */
    /* if operating in "dumb" mode, we only need one line */
    lines = smart_terminal ? screen_length - Header_lines : 1;

    if (lines < 0)
        lines = 0;
    /* we don't want more than MAX_COLS columns, since the machine-dependent
       modules make static allocations based on MAX_COLS and we don't want
       to run off the end of their buffers */
    display_width = screen_width;
    if (display_width >= MAX_COLS)
    {
        display_width = MAX_COLS - 1;
    }

    /* now, allocate space for the screen buffer */
    screenbuf = (char *)malloc(lines * display_width);
    if (screenbuf == (char *)NULL)
    {
        /* oops! */
        return(-1);
    }

    /* return number of lines available */
    /* for dumb terminals, pretend like we can show any amount */
    return(smart_terminal ? lines : Largest);
}

int display_updatecpus(statics)

struct statics *statics;

{
    register int *lp;
    register int lines;
    register int i;
    
    /* call resize to do the dirty work */
    lines = display_resize();
    if (pcpu_stats)
        num_cpus = statics->ncpus;
    else
        num_cpus = 1;
    cpustates_column = 5;       /* CPU: */
    if (num_cpus != 1)
    cpustates_column += 2;      /* CPU 0: */
    for (i = num_cpus; i > 9; i /= 10)
        cpustates_column++;

    /* fill the "last" array with all -1s, to insure correct updating */
    lp = lcpustates;
    i = num_cpustates * num_cpus;
    while (--i >= 0)
    {
        *lp++ = -1;
    }
    
    return(lines);
}
    
int display_init(statics)

struct statics *statics;

{
    register int lines;
    register char **pp;
    register int *ip;
    register int i;

    lines = display_updatecpus(statics);

    /* only do the rest if we need to */
    if (lines > -1)
    {
        /* save pointers and allocate space for names */
        procstate_names = statics->procstate_names;
        num_procstates = string_count(procstate_names);
        lprocstates = (int *)malloc(num_procstates * sizeof(int));

        cpustate_names = statics->cpustate_names;

        swap_names = statics->swap_names;
        num_swap = string_count(swap_names);
        lswap = (int *)malloc(num_swap * sizeof(int));
        num_cpustates = string_count(cpustate_names);
        lcpustates = (int *)malloc(num_cpustates * sizeof(int) * statics->ncpus);
        cpustate_columns = (int *)malloc(num_cpustates * sizeof(int));

        memory_names = statics->memory_names;
        num_memory = string_count(memory_names);
        lmemory = (int *)malloc(num_memory * sizeof(int));

        arc_names = statics->arc_names;
        
        /* calculate starting columns where needed */
        cpustate_total_length = 0;
        pp = cpustate_names;
        ip = cpustate_columns;
        while (*pp != NULL)
        {
            *ip++ = cpustate_total_length;
            if ((i = strlen(*pp++)) > 0)
            {
                cpustate_total_length += i + 8;
            }
        }
    }

    /* return number of lines available */
    return(lines);
}

void
i_loadave(mpid, avenrun)

int mpid;
double *avenrun;

{
    register int i;

    /* i_loadave also clears the screen, since it is first */
    clear();

    /* mpid == -1 implies this system doesn't have an _mpid */
    if (mpid != -1)
    {
        printf("last pid: %5d;  ", mpid);
    }

    printf("load averages");

    for (i = 0; i < 3; i++)
    {
        printf("%c %5.2f",
            i == 0 ? ':' : ',',
            avenrun[i]);
    }
    lmpid = mpid;
}

void
u_loadave(mpid, avenrun)

int mpid;
double *avenrun;

{
    register int i;

    if (mpid != -1)
    {
        /* change screen only when value has really changed */
        if (mpid != lmpid)
        {
            Move_to(x_lastpid, y_lastpid);
            printf("%5d", mpid);
            lmpid = mpid;
        }

        /* i remembers x coordinate to move to */
        i = x_loadave;
    }
    else
    {
        i = x_loadave_nompid;
    }

    /* move into position for load averages */
    Move_to(i, y_loadave);

    /* display new load averages */
    /* we should optimize this and only display changes */
    for (i = 0; i < 3; i++)
    {
        printf("%s%5.2f",
            i == 0 ? "" : ", ",
            avenrun[i]);
    }
}

void
i_timeofday(tod)

time_t *tod;

{
    /*
     *  Display the current time.
     *  "ctime" always returns a string that looks like this:
     *  
     *  Sun Sep 16 01:03:52 1973
     *      012345678901234567890123
     *            1         2
     *
     *  We want indices 11 thru 18 (length 8).
     */

    if (smart_terminal)
    {
        Move_to(screen_width - 8, 0);
    }
    else
    {
        fputs("    ", stdout);
    }
#ifdef DEBUG
    {
        char *foo;
        foo = ctime(tod);
        fputs(foo, stdout);
    }
#endif
    printf("%-8.8s\n", &(ctime(tod)[11]));
    lastline = 1;
}

static int ltotal = 0;
static char procstates_buffer[MAX_COLS];

/*
 *  *_procstates(total, brkdn, names) - print the process summary line
 *
 *  Assumptions:  cursor is at the beginning of the line on entry
 *                lastline is valid
 */

void
i_procstates(total, brkdn)

int total;
int *brkdn;

{
    register int i;

    /* write current number of processes and remember the value */
    printf("%d processes:", total);
    ltotal = total;

    /* put out enough spaces to get to column 15 */
    i = digits(total);
    while (i++ < 4)
    {
        putchar(' ');
    }

    /* format and print the process state summary */
    summary_format(procstates_buffer, brkdn, procstate_names);
    fputs(procstates_buffer, stdout);

    /* save the numbers for next time */
    memcpy(lprocstates, brkdn, num_procstates * sizeof(int));
}

void
u_procstates(total, brkdn)

int total;
int *brkdn;

{
    static char new[MAX_COLS];
    register int i;

    /* update number of processes only if it has changed */
    if (ltotal != total)
    {
        /* move and overwrite */
#if (x_procstate == 0)
        Move_to(x_procstate, y_procstate);
#else
        /* cursor is already there...no motion needed */
        /* assert(lastline == 1); */
#endif
        printf("%d", total);

        /* if number of digits differs, rewrite the label */
        if (digits(total) != digits(ltotal))
        {
            fputs(" processes:", stdout);
            /* put out enough spaces to get to column 15 */
            i = digits(total);
            while (i++ < 4)
            {
                putchar(' ');
            }
            /* cursor may end up right where we want it!!! */
        }

        /* save new total */
        ltotal = total;
    }

    /* see if any of the state numbers has changed */
    if (memcmp(lprocstates, brkdn, num_procstates * sizeof(int)) != 0)
    {
        /* format and update the line */
        summary_format(new, brkdn, procstate_names);
        line_update(procstates_buffer, new, x_brkdn, y_brkdn);
        memcpy(lprocstates, brkdn, num_procstates * sizeof(int));
    }
}

#ifdef no_more
/*
 *  *_cpustates(states, names) - print the cpu state percentages
 *
 *  Assumptions:  cursor is on the PREVIOUS line
 */

/* cpustates_tag() calculates the correct tag to use to label the line */

char *cpustates_tag()

{
    register char *use;

    static char *short_tag = "CPU: ";
    static char *long_tag = "CPU states: ";

    /* if length + strlen(long_tag) >= screen_width, then we have to
       use the shorter tag (we subtract 2 to account for ": ") */
    if (cpustate_total_length + (int)strlen(long_tag) - 2 >= screen_width)
    {
        use = short_tag;
    }
    else
    {
        use = long_tag;
    }

    /* set cpustates_column accordingly then return result */
    cpustates_column = strlen(use);
    return(use);
}
#endif

void
i_cpustates(states)

int *states;

{
    register int i = 0;
    register int value;
    register char **names;
    register char *thisname;
    int cpu;

for (cpu = 0; cpu < num_cpus; cpu++) {
    names = cpustate_names;

    /* print tag and bump lastline */
    if (num_cpus == 1)
        printf("\nCPU: ");
    else {
        value = printf("\nCPU %d: ", cpu);
        while (value++ <= cpustates_column)
                printf(" ");
    }
    lastline++;

    /* now walk thru the names and print the line */
    while ((thisname = *names++) != NULL)
    {
        if (*thisname != '\0')
        {
            /* retrieve the value and remember it */
            value = *states++;

            /* if percentage is >= 1000, print it as 100% */
            printf((value >= 1000 ? "%s%4.0f%% %s" : "%s%4.1f%% %s"),
                   (i++ % num_cpustates) == 0 ? "" : ", ",
                   ((float)value)/10.,
                   thisname);
        }
    }
}

    /* copy over values into "last" array */
    memcpy(lcpustates, states, num_cpustates * sizeof(int) * num_cpus);
}

void
u_cpustates(states)

int *states;

{
    register int value;
    register char **names;
    register char *thisname;
    register int *lp;
    register int *colp;
    int cpu;

for (cpu = 0; cpu < num_cpus; cpu++) {
    names = cpustate_names;

    Move_to(cpustates_column, y_cpustates + cpu);
    lastline = y_cpustates + cpu;
    lp = lcpustates + (cpu * num_cpustates);
    colp = cpustate_columns;

    /* we could be much more optimal about this */
    while ((thisname = *names++) != NULL)
    {
        if (*thisname != '\0')
        {
            /* did the value change since last time? */
            if (*lp != *states)
            {
                /* yes, move and change */
                Move_to(cpustates_column + *colp, y_cpustates + cpu);
                lastline = y_cpustates + cpu;

                /* retrieve value and remember it */
                value = *states;

                /* if percentage is >= 1000, print it as 100% */
                printf((value >= 1000 ? "%4.0f" : "%4.1f"),
                       ((double)value)/10.);

                /* remember it for next time */
                *lp = value;
            }
        }

        /* increment and move on */
        lp++;
        states++;
        colp++;
    }
}
}

void
z_cpustates()

{
    register int i = 0;
    register char **names;
    register char *thisname;
    register int *lp;
    int cpu, value;

for (cpu = 0; cpu < num_cpus; cpu++) {
    names = cpustate_names;

    /* show tag and bump lastline */
    if (num_cpus == 1)
        printf("\nCPU: ");
    else {
        value = printf("\nCPU %d: ", cpu);
        while (value++ <= cpustates_column)
                printf(" ");
    }
    lastline++;

    while ((thisname = *names++) != NULL)
    {
        if (*thisname != '\0')
        {
            printf("%s    %% %s", (i++ % num_cpustates) == 0 ? "" : ", ", thisname);
        }
    }
}

    /* fill the "last" array with all -1s, to insure correct updating */
    lp = lcpustates;
    i = num_cpustates * num_cpus;
    while (--i >= 0)
    {
        *lp++ = -1;
    }
}

/*
 *  *_memory(stats) - print "Memory: " followed by the memory summary string
 *
 *  Assumptions:  cursor is on "lastline"
 *                for i_memory ONLY: cursor is on the previous line
 */

char memory_buffer[MAX_COLS];

void
i_memory(stats)

int *stats;

{
    fputs("\nMem: ", stdout);
    lastline++;

    /* format and print the memory summary */
    summary_format(memory_buffer, stats, memory_names);
    fputs(memory_buffer, stdout);
}

void
u_memory(stats)

int *stats;

{
    static char new[MAX_COLS];

    /* format the new line */
    summary_format(new, stats, memory_names);
    line_update(memory_buffer, new, x_mem, y_mem);
}

/*
 *  *_arc(stats) - print "ARC: " followed by the ARC summary string
 *
 *  Assumptions:  cursor is on "lastline"
 *                for i_arc ONLY: cursor is on the previous line
 */
char arc_buffer[MAX_COLS];

void
i_arc(stats)

int *stats;

{
    if (arc_names == NULL)
        return;

    fputs("\nARC: ", stdout);
    lastline++;

    /* format and print the memory summary */
    summary_format(arc_buffer, stats, arc_names);
    fputs(arc_buffer, stdout);
}

void
u_arc(stats)

int *stats;

{
    static char new[MAX_COLS];

    if (arc_names == NULL)
        return;

    /* format the new line */
    summary_format(new, stats, arc_names);
    line_update(arc_buffer, new, x_arc, y_arc);
}

 
/*
 *  *_swap(stats) - print "Swap: " followed by the swap summary string
 *
 *  Assumptions:  cursor is on "lastline"
 *                for i_swap ONLY: cursor is on the previous line
 */

char swap_buffer[MAX_COLS];

void
i_swap(stats)

int *stats;

{
    fputs("\nSwap: ", stdout);
    lastline++;

    /* format and print the swap summary */
    summary_format(swap_buffer, stats, swap_names);
    fputs(swap_buffer, stdout);
}

void
u_swap(stats)

int *stats;

{
    static char new[MAX_COLS];

    /* format the new line */
    summary_format(new, stats, swap_names);
    line_update(swap_buffer, new, x_swap, y_swap);
}

/*
 *  *_message() - print the next pending message line, or erase the one
 *                that is there.
 *
 *  Note that u_message is (currently) the same as i_message.
 *
 *  Assumptions:  lastline is consistent
 */

/*
 *  i_message is funny because it gets its message asynchronously (with
 *      respect to screen updates).
 */

static char next_msg[MAX_COLS + 5];
static int msglen = 0;
/* Invariant: msglen is always the length of the message currently displayed
   on the screen (even when next_msg doesn't contain that message). */

void
i_message()

{
    while (lastline < y_message)
    {
        fputc('\n', stdout);
        lastline++;
    }
    if (next_msg[0] != '\0')
    {
        standout(next_msg);
        msglen = strlen(next_msg);
        next_msg[0] = '\0';
    }
    else if (msglen > 0)
    {
        (void) clear_eol(msglen);
        msglen = 0;
    }
}

void
u_message()

{
    i_message();
}

static int header_length;

/*
 * Trim a header string to the current display width and return a newly
 * allocated area with the trimmed header.
 */

char *
trim_header(text)

char *text;

{
        char *s;
        int width;

        s = NULL;
        width = display_width;
        header_length = strlen(text);
        if (header_length >= width) {
                s = malloc((width + 1) * sizeof(char));
                if (s == NULL)
                        return (NULL);
                strncpy(s, text, width);
                s[width] = '\0';
        }
        return (s);
}

/*
 *  *_header(text) - print the header for the process area
 *
 *  Assumptions:  cursor is on the previous line and lastline is consistent
 */

void
i_header(text)

char *text;

{
    char *s;

    s = trim_header(text);
    if (s != NULL)
        text = s;

    if (header_status == ON)
    {
        putchar('\n');
        fputs(text, stdout);
        lastline++;
    }
    else if (header_status == ERASE)
    {
        header_status = OFF;
    }
    free(s);
}

/*ARGSUSED*/
void
u_header(text)

char *text __unused;            /* ignored */

{

    if (header_status == ERASE)
    {
        putchar('\n');
        lastline++;
        clear_eol(header_length);
        header_status = OFF;
    }
}

/*
 *  *_process(line, thisline) - print one process line
 *
 *  Assumptions:  lastline is consistent
 */

void
i_process(line, thisline)

int line;
char *thisline;

{
    register char *p;
    register char *base;

    /* make sure we are on the correct line */
    while (lastline < y_procs + line)
    {
        putchar('\n');
        lastline++;
    }

    /* truncate the line to conform to our current screen width */
    thisline[display_width] = '\0';

    /* write the line out */
    fputs(thisline, stdout);

    /* copy it in to our buffer */
    base = smart_terminal ? screenbuf + lineindex(line) : screenbuf;
    p = strecpy(base, thisline);

    /* zero fill the rest of it */
    memzero(p, display_width - (p - base));
}

void
u_process(line, newline)

int line;
char *newline;

{
    register char *optr;
    register int screen_line = line + Header_lines;
    register char *bufferline;

    /* remember a pointer to the current line in the screen buffer */
    bufferline = &screenbuf[lineindex(line)];

    /* truncate the line to conform to our current screen width */
    newline[display_width] = '\0';

    /* is line higher than we went on the last display? */
    if (line >= last_hi)
    {
        /* yes, just ignore screenbuf and write it out directly */
        /* get positioned on the correct line */
        if (screen_line - lastline == 1)
        {
            putchar('\n');
            lastline++;
        }
        else
        {
            Move_to(0, screen_line);
            lastline = screen_line;
        }

        /* now write the line */
        fputs(newline, stdout);

        /* copy it in to the buffer */
        optr = strecpy(bufferline, newline);

        /* zero fill the rest of it */
        memzero(optr, display_width - (optr - bufferline));
    }
    else
    {
        line_update(bufferline, newline, 0, line + Header_lines);
    }
}

void
u_endscreen(hi)

int hi;

{
    register int screen_line = hi + Header_lines;
    register int i;

    if (smart_terminal)
    {
        if (hi < last_hi)
        {
            /* need to blank the remainder of the screen */
            /* but only if there is any screen left below this line */
            if (lastline + 1 < screen_length)
            {
                /* efficiently move to the end of currently displayed info */
                if (screen_line - lastline < 5)
                {
                    while (lastline < screen_line)
                    {
                        putchar('\n');
                        lastline++;
                    }
                }
                else
                {
                    Move_to(0, screen_line);
                    lastline = screen_line;
                }

                if (clear_to_end)
                {
                    /* we can do this the easy way */
                    putcap(clear_to_end);
                }
                else
                {
                    /* use clear_eol on each line */
                    i = hi;
                    while ((void) clear_eol(strlen(&screenbuf[lineindex(i++)])), i < last_hi)
                    {
                        putchar('\n');
                    }
                }
            }
        }
        last_hi = hi;

        /* move the cursor to a pleasant place */
        Move_to(x_idlecursor, y_idlecursor);
        lastline = y_idlecursor;
    }
    else
    {
        /* separate this display from the next with some vertical room */
        fputs("\n\n", stdout);
    }
}

void
display_header(t)

int t;

{
    if (t)
    {
        header_status = ON;
    }
    else if (header_status == ON)
    {
        header_status = ERASE;
    }
}

/*VARARGS2*/
void
new_message(type, msgfmt, a1, a2, a3)

int type;
char *msgfmt;
caddr_t a1, a2, a3;

{
    register int i;

    /* first, format the message */
    (void) snprintf(next_msg, sizeof(next_msg), msgfmt, a1, a2, a3);

    if (msglen > 0)
    {
        /* message there already -- can we clear it? */
        if (!overstrike)
        {
            /* yes -- write it and clear to end */
            i = strlen(next_msg);
            if ((type & MT_delayed) == 0)
            {
                type & MT_standout ? standout(next_msg) :
                                     fputs(next_msg, stdout);
                (void) clear_eol(msglen - i);
                msglen = i;
                next_msg[0] = '\0';
            }
        }
    }
    else
    {
        if ((type & MT_delayed) == 0)
        {
            type & MT_standout ? standout(next_msg) : fputs(next_msg, stdout);
            msglen = strlen(next_msg);
            next_msg[0] = '\0';
        }
    }
}

void
clear_message()

{
    if (clear_eol(msglen) == 1)
    {
        putchar('\r');
    }
}

int
readline(buffer, size, numeric)

char *buffer;
int  size;
int  numeric;

{
    register char *ptr = buffer;
    register char ch;
    register char cnt = 0;
    register char maxcnt = 0;

    /* allow room for null terminator */
    size -= 1;

    /* read loop */
    while ((fflush(stdout), read(0, ptr, 1) > 0))
    {
        /* newline means we are done */
        if ((ch = *ptr) == '\n' || ch == '\r')
        {
            break;
        }

        /* handle special editing characters */
        if (ch == ch_kill)
        {
            /* kill line -- account for overstriking */
            if (overstrike)
            {
                msglen += maxcnt;
            }

            /* return null string */
            *buffer = '\0';
            putchar('\r');
            return(-1);
        }
        else if (ch == ch_erase)
        {
            /* erase previous character */
            if (cnt <= 0)
            {
                /* none to erase! */
                putchar('\7');
            }
            else
            {
                fputs("\b \b", stdout);
                ptr--;
                cnt--;
            }
        }
        /* check for character validity and buffer overflow */
        else if (cnt == size || (numeric && !isdigit(ch)) ||
                !isprint(ch))
        {
            /* not legal */
            putchar('\7');
        }
        else
        {
            /* echo it and store it in the buffer */
            putchar(ch);
            ptr++;
            cnt++;
            if (cnt > maxcnt)
            {
                maxcnt = cnt;
            }
        }
    }

    /* all done -- null terminate the string */
    *ptr = '\0';

    /* account for the extra characters in the message area */
    /* (if terminal overstrikes, remember the furthest they went) */
    msglen += overstrike ? maxcnt : cnt;

    /* return either inputted number or string length */
    putchar('\r');
    return(cnt == 0 ? -1 : numeric ? atoi(buffer) : cnt);
}

/* internal support routines */

static int string_count(pp)

register char **pp;

{
    register int cnt;

    cnt = 0;
    while (*pp++ != NULL)
    {
        cnt++;
    }
    return(cnt);
}

static void summary_format(str, numbers, names)

char *str;
int *numbers;
register char **names;

{
    register char *p;
    register int num;
    register char *thisname;
    register int useM = No;

    /* format each number followed by its string */
    p = str;
    while ((thisname = *names++) != NULL)
    {
        /* get the number to format */
        num = *numbers++;

        /* display only non-zero numbers */
        if (num > 0)
        {
            /* is this number in kilobytes? */
            if (thisname[0] == 'K')
            {
                /* yes: format it as a memory value */
                p = strecpy(p, format_k(num));

                /* skip over the K, since it was included by format_k */
                p = strecpy(p, thisname+1);
            }
            else
            {
                p = strecpy(p, itoa(num));
                p = strecpy(p, thisname);
            }
        }

        /* ignore negative numbers, but display corresponding string */
        else if (num < 0)
        {
            p = strecpy(p, thisname);
        }
    }

    /* if the last two characters in the string are ", ", delete them */
    p -= 2;
    if (p >= str && p[0] == ',' && p[1] == ' ')
    {
        *p = '\0';
    }
}

static void line_update(old, new, start, line)

register char *old;
register char *new;
int start;
int line;

{
    register int ch;
    register int diff;
    register int newcol = start + 1;
    register int lastcol = start;
    char cursor_on_line = No;
    char *current;

    /* compare the two strings and only rewrite what has changed */
    current = old;
#ifdef DEBUG
    fprintf(debug, "line_update, starting at %d\n", start);
    fputs(old, debug);
    fputc('\n', debug);
    fputs(new, debug);
    fputs("\n-\n", debug);
#endif

    /* start things off on the right foot                   */
    /* this is to make sure the invariants get set up right */
    if ((ch = *new++) != *old)
    {
        if (line - lastline == 1 && start == 0)
        {
            putchar('\n');
        }
        else
        {
            Move_to(start, line);
        }
        cursor_on_line = Yes;
        putchar(ch);
        *old = ch;
        lastcol = 1;
    }
    old++;
        
    /*
     *  main loop -- check each character.  If the old and new aren't the
     *  same, then update the display.  When the distance from the
     *  current cursor position to the new change is small enough,
     *  the characters that belong there are written to move the
     *  cursor over.
     *
     *  Invariants:
     *      lastcol is the column where the cursor currently is sitting
     *          (always one beyond the end of the last mismatch).
     */
    do          /* yes, a do...while */
    {
        if ((ch = *new++) != *old)
        {
            /* new character is different from old        */
            /* make sure the cursor is on top of this character */
            diff = newcol - lastcol;
            if (diff > 0)
            {
                /* some motion is required--figure out which is shorter */
                if (diff < 6 && cursor_on_line)
                {
                    /* overwrite old stuff--get it out of the old buffer */
                    printf("%.*s", diff, &current[lastcol-start]);
                }
                else
                {
                    /* use cursor addressing */
                    Move_to(newcol, line);
                    cursor_on_line = Yes;
                }
                /* remember where the cursor is */
                lastcol = newcol + 1;
            }
            else
            {
                /* already there, update position */
                lastcol++;
            }
                
            /* write what we need to */
            if (ch == '\0')
            {
                /* at the end--terminate with a clear-to-end-of-line */
                (void) clear_eol(strlen(old));
            }
            else
            {
                /* write the new character */
                putchar(ch);
            }
            /* put the new character in the screen buffer */
            *old = ch;
        }
            
        /* update working column and screen buffer pointer */
        newcol++;
        old++;
            
    } while (ch != '\0');

    /* zero out the rest of the line buffer -- MUST BE DONE! */
    diff = display_width - newcol;
    if (diff > 0)
    {
        memzero(old, diff);
    }

    /* remember where the current line is */
    if (cursor_on_line)
    {
        lastline = line;
    }
}

/*
 *  printable(str) - make the string pointed to by "str" into one that is
 *      printable (i.e.: all ascii), by converting all non-printable
 *      characters into '?'.  Replacements are done in place and a pointer
 *      to the original buffer is returned.
 */

char *printable(str)

char *str;

{
    register char *ptr;
    register char ch;

    ptr = str;
    while ((ch = *ptr) != '\0')
    {
        if (!isprint(ch))
        {
            *ptr = '?';
        }
        ptr++;
    }
    return(str);
}

void
i_uptime(bt, tod)

struct timeval* bt;
time_t *tod;

{
    time_t uptime;
    int days, hrs, mins, secs;

    if (bt->tv_sec != -1) {
        uptime = *tod - bt->tv_sec;
        days = uptime / 86400;
        uptime %= 86400;
        hrs = uptime / 3600;
        uptime %= 3600;
        mins = uptime / 60;
        secs = uptime % 60;

        /*
         *  Display the uptime.
         */

        if (smart_terminal)
        {
            Move_to((screen_width - 24) - (days > 9 ? 1 : 0), 0);
        }
        else
        {
            fputs(" ", stdout);
        }
        printf(" up %d+%02d:%02d:%02d", days, hrs, mins, secs);
    }
}