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mvupwin.c
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C/C++ Source or Header
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1992-03-11
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2KB
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89 lines
#include "stdio.h"
#include "ed.h"
/*
* Move the current window up by "arg"
* lines. Recompute the new top line of the window.
* Look to see if "." is still on the screen. If it is,
* you win. If it isn't, then move "." to center it
* in the new framing of the window (this command does
* not really move "."; it moves the frame). Bound
* to "C-X C-P".
*/
ovmain(x, f, n)
register int n;
{
register LINE *lp;
register int i;
if (x == 1) { n = -n; x = 0; }
if (x == 3) return ( prevwind( f, n ));
if (x == 2) return ( nextwind( f, n ));
lp = curwp->w_linep;
if (n < 0)
{ while (n++ && lp!=curbp->b_linep)
lp = lforw(lp);
}
else
{ while (n-- && lback(lp)!=curbp->b_linep)
lp = lback(lp);
}
curwp->w_linep = lp;
curwp->w_flag |= WFHARD; /* Mode line is OK. */
for (i=0; i<curwp->w_ntrows; ++i)
{ if (lp == curwp->w_dotp)
return (TRUE);
if (lp == curbp->b_linep)
break;
lp = lforw(lp);
}
lp = curwp->w_linep;
i = curwp->w_ntrows/2;
while (i-- && lp!=curbp->b_linep)
lp = lforw(lp);
curwp->w_dotp = lp;
curwp->w_doto = 0;
return (TRUE);
}
/*
* The command make the next
* window (next => down the screen)
* the current window. There are no real
* errors, although the command does
* nothing if there is only 1 window on
* the screen. Bound to "C-X C-N".
*/
nextwind(f, n)
{
register WINDOW *wp;
if ((wp=curwp->w_wndp) == NULL)
wp = wheadp;
curwp = wp;
curbp = wp->w_bufp;
return (TRUE);
}
/*
* This command makes the previous
* window (previous => up the screen) the
* current window. There arn't any errors,
* although the command does not do a lot
* if there is 1 window.
*/
prevwind(f, n)
{
register WINDOW *wp1;
register WINDOW *wp2;
wp1 = wheadp;
wp2 = curwp;
if (wp1 == wp2)
wp2 = NULL;
while (wp1->w_wndp != wp2)
wp1 = wp1->w_wndp;
curwp = wp1;
curbp = wp1->w_bufp;
return (TRUE);
}