/*
 *  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
 */

/*
 *  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 <sys/cdefs.h>
#include <sys/resource.h>
#include <sys/time.h>

#include <assert.h>
#include <ctype.h>
#include <err.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <termcap.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 "machine.h"            /* we should eliminate this!!! */
#include "utils.h"

#ifdef DEBUG
FILE *debug;
#endif

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

#define lineindex(l) ((l)*screen_width)


/* things initialized by display_init and used thruout */

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

static const char * const *procstate_names;
static const char * const *cpustate_names;
static const char * const *memory_names;
static const char * const *arc_names;
static const char * const *carc_names;
static const char * const *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 void summary_format(char *, int *, const char * const *);
static void line_update(char *, char *, int, int);

static int setup_buffer_bufsiz = 0;
static char * setup_buffer(char *, int);

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_carc =           5;
int  y_carc =           5;
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(void)
{
    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;

    /* now, allocate space for the screen buffer */
    screenbuf = calloc(lines, screen_width);
    if (screenbuf == 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(struct statics *statics)
{
    int lines;
    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 += 1 + digits(num_cpus); /* CPU #: */
        }

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

    return(lines);
}

int
display_init(struct statics * statics)
{
    int lines;
    const char * const *pp;
    int *ip;
    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 = 8;
        assert(num_procstates > 0);
        lprocstates = calloc(num_procstates, sizeof(int));

        cpustate_names = statics->cpustate_names;

        swap_names = statics->swap_names;
        num_swap = 7;
        assert(num_swap > 0);
        lswap = calloc(num_swap, sizeof(int));
        num_cpustates = CPUSTATES;
        assert(num_cpustates > 0);
        lcpustates = calloc(num_cpustates * sizeof(int), statics->ncpus);
        cpustate_columns = calloc(num_cpustates, sizeof(int));

        memory_names = statics->memory_names;
        num_memory = 7;
        assert(num_memory > 0);
        lmemory = calloc(num_memory, sizeof(int));

        arc_names = statics->arc_names;
        carc_names = statics->carc_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(int mpid, double avenrun[])
{
    int i;

    /* i_loadave also clears the screen, since it is first */
    top_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 %7.2f",
            i == 0 ? ':' : ',',
            avenrun[i]);
    }
    lmpid = mpid;
}

void
u_loadave(int mpid, double *avenrun)
{
    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%7.2f",
            i == 0 ? "" : ", ",
            avenrun[i]);
    }
}

void
i_timeofday(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 = NULL;

/*
 *  *_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(int total, int *brkdn)
{
    int i;

    procstates_buffer = setup_buffer(procstates_buffer, 0);

    /* write current number of processes and remember the value */
    printf("%d %s:", total, ps.thread ? "threads" : "processes");
    ltotal = total;

    /* put out enough spaces to get to column 15 */
    i = digits(total);
    while (i++ < (ps.thread ? 6 : 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(int total, int *brkdn)
{
    static char *new = NULL;
    int i;

    new = setup_buffer(new, 0);

    /* 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);
        }
        printf("%d", total);

        /* if number of digits differs, rewrite the label */
        if (digits(total) != digits(ltotal))
        {
            printf(" %s:", ps.thread ? "threads" : "processes");
            /* put out enough spaces to get to column 15 */
            i = digits(total);
            while (i++ < (ps.thread ? 6 : 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));
    }
}

void
i_cpustates(int *states)
{
    int i = 0;
    int value;
    const char * const *names;
    const char *thisname;
    int *hstates = states;
    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 */
    states = hstates;
    memcpy(lcpustates, states, num_cpustates * sizeof(int) * num_cpus);
}

void
u_cpustates(int *states)
{
    int value;
    const char * const *names;
    const char *thisname;
    int *hstates = states;
    int *lp;
    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++;
    }
}

    states = hstates;
}

void
z_cpustates(void)
{
    int i = 0;
    const char * const *names;
    const char *thisname;
    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 */
        for (i = 0; i < num_cpustates * num_cpus; ++i) {
                lcpustates[i] = -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
 */

static char *memory_buffer = NULL;

void
i_memory(int *stats)
{
    memory_buffer = setup_buffer(memory_buffer, 0);

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

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

void
u_memory(int *stats)
{
    static char *new = NULL;

    new = setup_buffer(new, 0);

    /* 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
 */
static char *arc_buffer = NULL;

void
i_arc(int *stats)
{
    arc_buffer = setup_buffer(arc_buffer, 0);

    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(int *stats)
{
    static char *new = NULL;

    new = setup_buffer(new, 0);

    if (arc_names == NULL)
        return;

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


/*
 *  *_carc(stats) - print "Compressed ARC: " followed by the summary string
 *
 *  Assumptions:  cursor is on "lastline"
 *                for i_carc ONLY: cursor is on the previous line
 */
static char *carc_buffer = NULL;

void
i_carc(int *stats)
{
    carc_buffer = setup_buffer(carc_buffer, 0);

    if (carc_names == NULL)
        return;

    fputs("\n     ", stdout);
    lastline++;

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

void
u_carc(int *stats)
{
    static char *new = NULL;

    new = setup_buffer(new, 0);

    if (carc_names == NULL)
        return;

    /* format the new line */
    summary_format(new, stats, carc_names);
    line_update(carc_buffer, new, x_carc, y_carc);
}

/*
 *  *_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
 */

static char *swap_buffer = NULL;

void
i_swap(int *stats)
{
    swap_buffer = setup_buffer(swap_buffer, 0);

    if (swap_names == NULL)
            return;

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

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

void
u_swap(int *stats)
{
    static char *new = NULL;

    new = setup_buffer(new, 0);

    if (swap_names == NULL)
            return;

    /* 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).
 */

#define NEXT_MSG_ADDLEN 5
static char *next_msg = NULL;
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(void)
{
    next_msg = setup_buffer(next_msg, NEXT_MSG_ADDLEN);

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

void
u_message(void)
{
    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(const char *text)
{
        char *s;
        int width;

        s = NULL;
        width = screen_width;
        header_length = strlen(text);
        if (header_length >= width) {
                s = strndup(text, width);
                if (s == NULL)
                        return (NULL);
        }
        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(const 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);
}

void
u_header(const char *text __unused)
{

    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(int line, char *thisline)
{
    char *p;
    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 */
    int len = strlen(thisline);
    if (screen_width < len)
    {
        thisline[screen_width] = '\0';
    }

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

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

    /* zero fill the rest of it */
    if (p - base < screen_width)
    {
        memset(p, 0, screen_width - (p - base));
    }
}

void
u_process(int line, char *newline)
{
    char *optr;
    int screen_line = line + Header_lines;
    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 */
    int len = strlen(newline);
    if (screen_width < len)
    {
        newline[screen_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 = stpcpy(bufferline, newline);

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

void
u_endscreen(int hi)
{
    int screen_line = hi + Header_lines;
    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(int t)
{

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

void
new_message(int type, const char *msgfmt, ...)
{
    va_list args;
    size_t i;

    va_start(args, msgfmt);

    /* first, format the message */
    vsnprintf(next_msg, setup_buffer_bufsiz + NEXT_MSG_ADDLEN,
                    msgfmt, args);

    va_end(args);

    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)
            {
                        if (type & MT_standout) {
                                top_standout(next_msg);
                        } else {
                                fputs(next_msg, stdout);
                        }
                        clear_eol(msglen - i);
                        msglen = i;
                        next_msg[0] = '\0';
            }
        }
    }
    else
    {
        if ((type & MT_delayed) == 0)
        {
                if (type & MT_standout) {
                        top_standout(next_msg);
                } else {
                        fputs(next_msg, stdout);
                }
            msglen = strlen(next_msg);
            next_msg[0] = '\0';
        }
    }
}

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

int
readline(char *buffer, int size, int numeric)
{
    char *ptr = buffer;
    char ch;
    char cnt = 0;
    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 void
summary_format(char *str, int *numbers, const char * const *names)
{
    char *p;
    int num;
    const char *thisname;
    char rbuf[6];

    /* 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 = stpcpy(p, format_k(num));

                /* skip over the K, since it was included by format_k */
                p = stpcpy(p, thisname+1);
            }
            /* is this number a ratio? */
            else if (thisname[0] == ':')
            {
                (void) snprintf(rbuf, sizeof(rbuf), "%.2f",
                    (float)*(numbers - 2) / (float)num);
                p = stpcpy(p, rbuf);
                p = stpcpy(p, thisname);
            }
            else
            {
                p = stpcpy(p, itoa(num));
                p = stpcpy(p, thisname);
            }
        }

        /* ignore negative numbers, but display corresponding string */
        else if (num < 0)
        {
            p = stpcpy(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(char *old, char *new, int start, int line)
{
    int ch;
    int diff;
    int newcol = start + 1;
    int lastcol = start;
    char cursor_on_line = false;
    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 = true;
        putchar(ch);
        *old = ch;
        lastcol = start + 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 = true;
                }
                /* 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 = screen_width - newcol;
    if (diff > 0)
    {
        memset(old, 0, diff);
    }

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

void
i_uptime(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);
    }
}

void
i_battery(int nbat, int batt)
{

        if (nbat > 0) {
                printf("; battery: %d%%", batt);
        }
}

#define SETUPBUFFER_MIN_SCREENWIDTH 80
#define SETUPBUFFER_REQUIRED_ADDBUFSIZ 2

static char *
setup_buffer(char *buffer, int addlen)
{
    size_t len, old_len;
    char *new_buffer;

    setup_buffer_bufsiz = screen_width;
    if (setup_buffer_bufsiz < SETUPBUFFER_MIN_SCREENWIDTH)
    {
        setup_buffer_bufsiz = SETUPBUFFER_MIN_SCREENWIDTH;
    }

    len = setup_buffer_bufsiz + addlen + SETUPBUFFER_REQUIRED_ADDBUFSIZ;
    new_buffer = calloc(len, sizeof(char));
    if (new_buffer == NULL)
    {
        errx(4, "can't allocate sufficient memory");
    }
    if (buffer != NULL)
    {
        old_len = strlen(buffer);
        memcpy(new_buffer, buffer, old_len < len - 1 ? old_len : len - 1);
        free(buffer);
    }

    return new_buffer;
}