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