#include "ex.h"

#ifdef VISUAL

#include "ex_tty.h"

#include "ex_vis.h"

/*

* Ex - a text editor

* Bill Joy UCB September, 1977

*/

static void vputs(char *);

/*

* Clear the entire (physical and logical) screen

*/

void

vclear(void)

{

vputs(CLEAR);

destcol = 0;

outcol = 0;

destline = 0;

outline = 0;

vclrbyte(vtube0, LINES * COLUMNS);

}

/*

* Put out a control sequence to the terminal.

*/

static void

vputs(char *cp)

{

while (*cp)

vputc(*cp++);

}

/*

* Clear bytes logically

*/

void

vclrbyte(char *cp, int i)

{

if (i > 0)

do

*cp++ = 0;

while (--i != 0);

}

/*

* Clear a physical line

*/

void

vclrlin(int l, int *tp)

{

vigoto(l, 0);

if (!holdat)

ex_putchar(tp > dol ? '~' : '@');

vclreol();

}

/*

* Clear to the end of the current physical line

*/

void

vclreol(void)

{

register int i;

register char *tp;

if (destcol == VCOLUMNS)

return;

destline += destcol / VCOLUMNS;

destcol %= VCOLUMNS;

#ifdef DEBUG

if (destline < 0 || destline > TUBELINES)

error("Internal error: vclreol@- please tell someone");

#endif

i = VCOLUMNS - destcol;

tp = vtube[destline] + destcol;

if (*tp == 0)

return;

if (CE) {

vcsync();

vputs(CE);

vclrbyte(tp, i);

return;

}

while (i > 0 && *tp != 0) {

vputchar(' ');

--i, tp++;

}

}

#endif