display.c

在Linux/UNIX下

    }
    else if (msglen > 0)
    {
	(void) clear_eol(msglen);
	msglen = 0;
    }
}

u_message()

{
    i_message();
}

static int header_length;

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

i_header(text)

char *text;

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

/*ARGSUSED*/
u_header(text)

char *text;		/* 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
 */

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));
}

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);
    }
}

u_endscreen(hi)

register 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);
    }
}

display_header(t)

int t;

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

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

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

{
    register int i;

    /* first, format the message */
    (void) sprintf(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';
	}
    }
}

clear_message()

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

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')
	{
	    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);
}