2 * Copyright (c) 1992, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 * Copyright (c) 1992, 1993, 1994, 1995, 1996
5 * Keith Bostic. All rights reserved.
7 * See the LICENSE file for redistribution information.
13 static const char sccsid[] = "@(#)v_z.c 10.10 (Berkeley) 5/16/96";
16 #include <sys/types.h>
17 #include <sys/queue.h>
20 #include <bitstring.h>
24 #include "../common/common.h"
28 * v_z -- [count]z[count][-.+^<CR>]
31 * PUBLIC: int v_z __P((SCR *, VICMD *));
42 * The first count is the line to use. If the value doesn't
43 * exist, use the last line.
45 if (F_ISSET(vp, VC_C1SET)) {
47 if (!db_exist(sp, lno) && db_last(sp, &lno))
50 lno = vp->m_start.lno;
52 /* Set default return cursor line. */
53 vp->m_final.lno = lno;
54 vp->m_final.cno = vp->m_start.cno;
57 * The second count is the displayed window size, i.e. the 'z' command
58 * is another way to get artificially small windows. Note, you can't
59 * grow beyond the size of the window.
62 * A window size of 0 was historically allowed, and simply ignored.
63 * This could be much more simply done by modifying the value of the
64 * O_WINDOW option, but that's not how it worked historically.
66 if (F_ISSET(vp, VC_C2SET) && vp->count2 != 0) {
67 if (vp->count2 > O_VAL(sp, O_WINDOW))
68 vp->count2 = O_VAL(sp, O_WINDOW);
69 if (vs_crel(sp, vp->count2))
73 switch (vp->character) {
74 case '-': /* Put the line at the bottom. */
75 if (vs_sm_fill(sp, lno, P_BOTTOM))
78 case '.': /* Put the line in the middle. */
79 if (vs_sm_fill(sp, lno, P_MIDDLE))
84 * If the user specified a line number, put that line at the
85 * top and move the cursor to it. Otherwise, scroll forward
86 * a screen from the current screen.
88 if (F_ISSET(vp, VC_C1SET)) {
89 if (vs_sm_fill(sp, lno, P_TOP))
91 if (vs_sm_position(sp, &vp->m_final, 0, P_TOP))
94 if (vs_sm_scroll(sp, &vp->m_final, sp->t_rows, Z_PLUS))
99 * If the user specified a line number, put that line at the
100 * bottom, move the cursor to it, and then display the screen
101 * before that one. Otherwise, scroll backward a screen from
102 * the current screen.
105 * Note, we match the off-by-one characteristics of historic
108 if (F_ISSET(vp, VC_C1SET)) {
109 if (vs_sm_fill(sp, lno, P_BOTTOM))
111 if (vs_sm_position(sp, &vp->m_final, 0, P_TOP))
113 if (vs_sm_fill(sp, vp->m_final.lno, P_BOTTOM))
116 if (vs_sm_scroll(sp, &vp->m_final, sp->t_rows, Z_CARAT))
119 default: /* Put the line at the top for <cr>. */
120 value = KEY_VAL(sp, vp->character);
121 if (value != K_CR && value != K_NL) {
122 v_emsg(sp, vp->kp->usage, VIM_USAGE);
125 if (vs_sm_fill(sp, lno, P_TOP))
134 * Change the relative size of the current screen.
136 * PUBLIC: int vs_crel __P((SCR *, long));
143 sp->t_minrows = sp->t_rows = count;
144 if (sp->t_rows > sp->rows - 1)
145 sp->t_minrows = sp->t_rows = sp->rows - 1;
146 TMAP = HMAP + (sp->t_rows - 1);
147 F_SET(sp, SC_SCR_REDRAW);