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/*-
* Copyright (c) 1992, 1993, 1994
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1992, 1993, 1994, 1995, 1996
* Keith Bostic. All rights reserved.
*
* See the LICENSE file for redistribution information.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)v_z.c 10.10 (Berkeley) 5/16/96";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <bitstring.h>
#include <limits.h>
#include <stdio.h>
#include "../common/common.h"
#include "vi.h"
/*
* v_z -- [count]z[count][-.+^<CR>]
* Move the screen.
*
* PUBLIC: int v_z __P((SCR *, VICMD *));
*/
int
v_z(sp, vp)
SCR *sp;
VICMD *vp;
{
recno_t lno;
u_int value;
/*
* The first count is the line to use. If the value doesn't
* exist, use the last line.
*/
if (F_ISSET(vp, VC_C1SET)) {
lno = vp->count;
if (!db_exist(sp, lno) && db_last(sp, &lno))
return (1);
} else
lno = vp->m_start.lno;
/* Set default return cursor line. */
vp->m_final.lno = lno;
vp->m_final.cno = vp->m_start.cno;
/*
* The second count is the displayed window size, i.e. the 'z' command
* is another way to get artificially small windows. Note, you can't
* grow beyond the size of the window.
*
* !!!
* A window size of 0 was historically allowed, and simply ignored.
* This could be much more simply done by modifying the value of the
* O_WINDOW option, but that's not how it worked historically.
*/
if (F_ISSET(vp, VC_C2SET) && vp->count2 != 0) {
if (vp->count2 > O_VAL(sp, O_WINDOW))
vp->count2 = O_VAL(sp, O_WINDOW);
if (vs_crel(sp, vp->count2))
return (1);
}
switch (vp->character) {
case '-': /* Put the line at the bottom. */
if (vs_sm_fill(sp, lno, P_BOTTOM))
return (1);
break;
case '.': /* Put the line in the middle. */
if (vs_sm_fill(sp, lno, P_MIDDLE))
return (1);
break;
case '+':
/*
* If the user specified a line number, put that line at the
* top and move the cursor to it. Otherwise, scroll forward
* a screen from the current screen.
*/
if (F_ISSET(vp, VC_C1SET)) {
if (vs_sm_fill(sp, lno, P_TOP))
return (1);
if (vs_sm_position(sp, &vp->m_final, 0, P_TOP))
return (1);
} else
if (vs_sm_scroll(sp, &vp->m_final, sp->t_rows, Z_PLUS))
return (1);
break;
case '^':
/*
* If the user specified a line number, put that line at the
* bottom, move the cursor to it, and then display the screen
* before that one. Otherwise, scroll backward a screen from
* the current screen.
*
* !!!
* Note, we match the off-by-one characteristics of historic
* vi, here.
*/
if (F_ISSET(vp, VC_C1SET)) {
if (vs_sm_fill(sp, lno, P_BOTTOM))
return (1);
if (vs_sm_position(sp, &vp->m_final, 0, P_TOP))
return (1);
if (vs_sm_fill(sp, vp->m_final.lno, P_BOTTOM))
return (1);
} else
if (vs_sm_scroll(sp, &vp->m_final, sp->t_rows, Z_CARAT))
return (1);
break;
default: /* Put the line at the top for <cr>. */
value = KEY_VAL(sp, vp->character);
if (value != K_CR && value != K_NL) {
v_emsg(sp, vp->kp->usage, VIM_USAGE);
return (1);
}
if (vs_sm_fill(sp, lno, P_TOP))
return (1);
break;
}
return (0);
}
/*
* vs_crel --
* Change the relative size of the current screen.
*
* PUBLIC: int vs_crel __P((SCR *, long));
*/
int
vs_crel(sp, count)
SCR *sp;
long count;
{
sp->t_minrows = sp->t_rows = count;
if (sp->t_rows > sp->rows - 1)
sp->t_minrows = sp->t_rows = sp->rows - 1;
TMAP = HMAP + (sp->t_rows - 1);
F_SET(sp, SC_SCR_REDRAW);
return (0);
}
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