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146 lines
3.5 KiB
C
146 lines
3.5 KiB
C
/*-
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* Copyright (c) 1992, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 1992, 1993, 1994, 1995, 1996
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* Keith Bostic. All rights reserved.
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*
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* See the LICENSE file for redistribution information.
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*/
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#include "config.h"
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#ifndef lint
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static const char sccsid[] = "$Id: v_z.c,v 10.13 2011/12/02 17:26:59 zy Exp $";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <sys/time.h>
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#include <bitstring.h>
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#include <limits.h>
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#include <stdio.h>
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#include "../common/common.h"
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#include "vi.h"
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/*
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* v_z -- [count]z[count][-.+^<CR>]
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* Move the screen.
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*
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* PUBLIC: int v_z(SCR *, VICMD *);
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*/
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int
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v_z(SCR *sp, VICMD *vp)
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{
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recno_t lno;
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e_key_t value;
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/*
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* The first count is the line to use. If the value doesn't
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* exist, use the last line.
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*/
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if (F_ISSET(vp, VC_C1SET)) {
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lno = vp->count;
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if (!db_exist(sp, lno) && db_last(sp, &lno))
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return (1);
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} else
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lno = vp->m_start.lno;
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/* Set default return cursor line. */
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vp->m_final.lno = lno;
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vp->m_final.cno = vp->m_start.cno;
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/*
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* The second count is the displayed window size, i.e. the 'z' command
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* is another way to get artificially small windows. Note, you can't
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* grow beyond the size of the window.
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*
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* !!!
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* A window size of 0 was historically allowed, and simply ignored.
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* This could be much more simply done by modifying the value of the
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* O_WINDOW option, but that's not how it worked historically.
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*/
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if (F_ISSET(vp, VC_C2SET) && vp->count2 != 0) {
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if (vp->count2 > O_VAL(sp, O_WINDOW))
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vp->count2 = O_VAL(sp, O_WINDOW);
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if (vs_crel(sp, vp->count2))
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return (1);
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}
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switch (vp->character) {
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case '-': /* Put the line at the bottom. */
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if (vs_sm_fill(sp, lno, P_BOTTOM))
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return (1);
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break;
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case '.': /* Put the line in the middle. */
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if (vs_sm_fill(sp, lno, P_MIDDLE))
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return (1);
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break;
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case '+':
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/*
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* If the user specified a line number, put that line at the
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* top and move the cursor to it. Otherwise, scroll forward
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* a screen from the current screen.
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*/
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if (F_ISSET(vp, VC_C1SET)) {
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if (vs_sm_fill(sp, lno, P_TOP))
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return (1);
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if (vs_sm_position(sp, &vp->m_final, 0, P_TOP))
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return (1);
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} else
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if (vs_sm_scroll(sp, &vp->m_final, sp->t_rows, Z_PLUS))
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return (1);
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break;
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case '^':
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/*
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* If the user specified a line number, put that line at the
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* bottom, move the cursor to it, and then display the screen
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* before that one. Otherwise, scroll backward a screen from
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* the current screen.
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*
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* !!!
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* Note, we match the off-by-one characteristics of historic
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* vi, here.
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*/
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if (F_ISSET(vp, VC_C1SET)) {
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if (vs_sm_fill(sp, lno, P_BOTTOM))
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return (1);
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if (vs_sm_position(sp, &vp->m_final, 0, P_TOP))
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return (1);
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if (vs_sm_fill(sp, vp->m_final.lno, P_BOTTOM))
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return (1);
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} else
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if (vs_sm_scroll(sp, &vp->m_final, sp->t_rows, Z_CARAT))
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return (1);
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break;
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default: /* Put the line at the top for <cr>. */
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value = KEY_VAL(sp, vp->character);
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if (value != K_CR && value != K_NL) {
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v_emsg(sp, vp->kp->usage, VIM_USAGE);
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return (1);
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}
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if (vs_sm_fill(sp, lno, P_TOP))
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return (1);
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break;
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}
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return (0);
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}
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/*
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* vs_crel --
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* Change the relative size of the current screen.
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*
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* PUBLIC: int vs_crel(SCR *, long);
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*/
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int
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vs_crel(SCR *sp, long int count)
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{
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sp->t_minrows = sp->t_rows = count;
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if (sp->t_rows > sp->rows - 1)
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sp->t_minrows = sp->t_rows = sp->rows - 1;
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TMAP = HMAP + (sp->t_rows - 1);
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F_SET(sp, SC_SCR_REDRAW);
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return (0);
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}
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