minix/lib/libcurses/winscrol.c

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2005-04-21 16:53:53 +02:00
/****************************************************************/
/* Scroll() routine of the PCcurses package */
/* */
/****************************************************************/
/* This version of curses is based on ncurses, a curses version */
/* Originally written by Pavel Curtis at Cornell University. */
/* I have made substantial changes to make it run on IBM PC's, */
/* And therefore consider myself free to make it public domain. */
/* Bjorn Larsson (...mcvax!enea!infovax!bl) */
/****************************************************************/
/* 1.0: Release: 870515 */
/****************************************************************/
/* Modified to run under the MINIX operating system by Don Cope */
/* These changes are also released into the public domain. */
/* 900906 */
/****************************************************************/
#include <curses.h>
#include "curspriv.h"
/****************************************************************/
/* Scroll() scrolls the scrolling region of 'win', but only if */
/* Scrolling is allowed and if the cursor is inside the scrol- */
/* Ling region. */
/****************************************************************/
void scroll(win)
WINDOW *win;
{
int i;
int *ptr;
int *temp;
static int blank;
blank = ' ' | (win->_attrs & ATR_MSK);
if ((!win->_scroll) /* check if window scrolls */
||(win->_cury < win->_regtop) /* and cursor in region */
||(win->_cury > win->_regbottom)
)
return;
temp = win->_line[win->_regtop];
for (i = win->_regtop; i < win->_regbottom; i++) {
win->_line[i] = win->_line[i + 1]; /* re-arrange line pointers */
win->_minchng[i] = 0;
win->_maxchng[i] = win->_maxx;
}
for (ptr = temp; ptr - temp <= win->_maxx; ptr++)
*ptr = blank; /* make a blank line */
win->_line[win->_regbottom] = temp;
if (win->_cury > win->_regtop)/* if not on top line */
win->_cury--; /* cursor scrolls too */
win->_minchng[win->_regbottom] = 0;
win->_maxchng[win->_regbottom] = win->_maxx;
} /* scroll */