more use of CHAR_T
[nvi.git] / vi / v_z.c
blobd58d3b39ff7a7c348151e5cb6bdbda0400bfdc14
1 /*-
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.
8 */
10 #include "config.h"
12 #ifndef lint
13 static const char sccsid[] = "$Id: v_z.c,v 10.11 2000/04/21 19:00:41 skimo Exp $ (Berkeley) $Date: 2000/04/21 19:00:41 $";
14 #endif /* not lint */
16 #include <sys/types.h>
17 #include <sys/queue.h>
18 #include <sys/time.h>
20 #include <bitstring.h>
21 #include <limits.h>
22 #include <stdio.h>
24 #include "../common/common.h"
25 #include "vi.h"
28 * v_z -- [count]z[count][-.+^<CR>]
29 * Move the screen.
31 * PUBLIC: int v_z __P((SCR *, VICMD *));
33 int
34 v_z(sp, vp)
35 SCR *sp;
36 VICMD *vp;
38 db_recno_t lno;
39 u_int value;
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)) {
46 lno = vp->count;
47 if (!db_exist(sp, lno) && db_last(sp, &lno))
48 return (1);
49 } else
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.
61 * !!!
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))
70 return (1);
73 switch (vp->character) {
74 case '-': /* Put the line at the bottom. */
75 if (vs_sm_fill(sp, lno, P_BOTTOM))
76 return (1);
77 break;
78 case '.': /* Put the line in the middle. */
79 if (vs_sm_fill(sp, lno, P_MIDDLE))
80 return (1);
81 break;
82 case '+':
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))
90 return (1);
91 if (vs_sm_position(sp, &vp->m_final, 0, P_TOP))
92 return (1);
93 } else
94 if (vs_sm_scroll(sp, &vp->m_final, sp->t_rows, Z_PLUS))
95 return (1);
96 break;
97 case '^':
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.
104 * !!!
105 * Note, we match the off-by-one characteristics of historic
106 * vi, here.
108 if (F_ISSET(vp, VC_C1SET)) {
109 if (vs_sm_fill(sp, lno, P_BOTTOM))
110 return (1);
111 if (vs_sm_position(sp, &vp->m_final, 0, P_TOP))
112 return (1);
113 if (vs_sm_fill(sp, vp->m_final.lno, P_BOTTOM))
114 return (1);
115 } else
116 if (vs_sm_scroll(sp, &vp->m_final, sp->t_rows, Z_CARAT))
117 return (1);
118 break;
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);
123 return (1);
125 if (vs_sm_fill(sp, lno, P_TOP))
126 return (1);
127 break;
129 return (0);
133 * vs_crel --
134 * Change the relative size of the current screen.
136 * PUBLIC: int vs_crel __P((SCR *, long));
139 vs_crel(sp, count)
140 SCR *sp;
141 long count;
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);
148 return (0);