Annotation of src/usr.bin/top/screen.c, Revision 1.20
1.20 ! otto 1: /* $OpenBSD: screen.c,v 1.19 2008/09/24 18:53:55 chl Exp $ */
1.1 downsj 2:
3: /*
4: * Top users/processes display for Unix
5: * Version 3
6: *
1.8 deraadt 7: * Copyright (c) 1984, 1989, William LeFebvre, Rice University
8: * Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
1.1 downsj 9: *
1.8 deraadt 10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22: * IN NO EVENT SHALL THE AUTHOR OR HIS EMPLOYER BE LIABLE FOR ANY DIRECT, INDIRECT,
23: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.1 downsj 29: */
30:
1.10 deraadt 31: /*
32: * This file contains the routines that interface to termcap and stty/gtty.
1.14 deraadt 33: *
1.10 deraadt 34: * Paul Vixie, February 1987: converted to use ioctl() instead of stty/gtty.
1.14 deraadt 35: *
1.10 deraadt 36: * I put in code to turn on the TOSTOP bit while top was running, but I didn't
37: * really like the results. If you desire it, turn on the preprocessor
38: * variable "TOStop". --wnl
1.1 downsj 39: */
40:
1.2 downsj 41: #include <sys/types.h>
42: #include <sys/ioctl.h>
1.17 otto 43: #include <curses.h>
1.13 millert 44: #include <err.h>
1.2 downsj 45: #include <stdio.h>
46: #include <stdlib.h>
47: #include <term.h>
48: #include <unistd.h>
49:
1.1 downsj 50: #include "top.h"
51: #include "screen.h"
1.20 ! otto 52: #include "layout.h"
1.1 downsj 53: #include "boolean.h"
54:
1.17 otto 55: int screen_length, screen_width;
56: char ch_erase, ch_kill, smart_terminal;
1.1 downsj 57:
1.12 deraadt 58: static struct termios old_settings, new_settings;
1.17 otto 59: static char is_a_terminal = No;
1.1 downsj 60:
1.9 pvalchev 61: void
62: init_termcap(int interactive)
1.1 downsj 63: {
1.17 otto 64: char *term_name;
1.10 deraadt 65: int status;
66:
67: /* set defaults in case we aren't smart */
68: screen_width = MAX_COLS;
69: screen_length = 0;
70:
71: if (!interactive) {
72: /* pretend we have a dumb terminal */
73: smart_terminal = No;
74: return;
75: }
76: /* assume we have a smart terminal until proven otherwise */
77: smart_terminal = Yes;
78:
79: /* get the terminal name */
80: term_name = getenv("TERM");
81:
82: /* if there is no TERM, assume it's a dumb terminal */
83: /* patch courtesy of Sam Horrocks at telegraph.ics.uci.edu */
84: if (term_name == NULL) {
85: smart_terminal = No;
86: return;
87: }
88:
89: /* now get the termcap entry */
90: if ((status = tgetent(NULL, term_name)) != 1) {
91: if (status == -1)
1.12 deraadt 92: warnx("can't open termcap file");
1.10 deraadt 93: else
1.12 deraadt 94: warnx("no termcap entry for a `%s' terminal", term_name);
1.10 deraadt 95:
96: /* pretend it's dumb and proceed */
97: smart_terminal = No;
98: return;
1.1 downsj 99: }
1.10 deraadt 100:
101: /* "hardcopy" immediately indicates a very stupid terminal */
102: if (tgetflag("hc")) {
103: smart_terminal = No;
104: return;
105: }
1.17 otto 106:
1.10 deraadt 107: /* set up common terminal capabilities */
1.20 ! otto 108: if ((screen_length = tgetnum("li")) <= y_procs) {
1.10 deraadt 109: screen_length = smart_terminal = 0;
110: return;
111: }
112:
113: /* screen_width is a little different */
114: if ((screen_width = tgetnum("co")) == -1)
115: screen_width = 79;
1.1 downsj 116: else
1.10 deraadt 117: screen_width -= 1;
118:
1.17 otto 119: /* get necessary capabilities */
120: if (tgetstr("cl", NULL) == NULL || tgetstr("cm", NULL) == NULL) {
121: smart_terminal = No;
122: return;
123: }
1.10 deraadt 124:
125: /* get the actual screen size with an ioctl, if needed */
126: /*
127: * This may change screen_width and screen_length, and it always sets
128: * lower_left.
129: */
130: get_screensize();
131:
132: /* if stdout is not a terminal, pretend we are a dumb terminal */
133: if (tcgetattr(STDOUT_FILENO, &old_settings) == -1)
134: smart_terminal = No;
1.1 downsj 135: }
136:
1.9 pvalchev 137: void
138: init_screen(void)
1.1 downsj 139: {
1.10 deraadt 140: /* get the old settings for safe keeping */
141: if (tcgetattr(STDOUT_FILENO, &old_settings) != -1) {
142: /* copy the settings so we can modify them */
143: new_settings = old_settings;
144: /* turn off ICANON, character echo and tab expansion */
145: new_settings.c_lflag &= ~(ICANON | ECHO);
146: new_settings.c_oflag &= ~(OXTABS);
147: new_settings.c_cc[VMIN] = 1;
148: new_settings.c_cc[VTIME] = 0;
1.17 otto 149:
1.10 deraadt 150: (void) tcsetattr(STDOUT_FILENO, TCSADRAIN, &new_settings);
151: /* remember the erase and kill characters */
152: ch_erase = old_settings.c_cc[VERASE];
153: ch_kill = old_settings.c_cc[VKILL];
154:
155: is_a_terminal = Yes;
1.17 otto 156: #if 0
1.10 deraadt 157: /* send the termcap initialization string */
158: putcap(terminal_init);
1.17 otto 159: #endif
1.10 deraadt 160: }
161: if (!is_a_terminal) {
162: /* not a terminal at all---consider it dumb */
163: smart_terminal = No;
164: }
1.17 otto 165:
166: if (smart_terminal)
167: initscr();
1.1 downsj 168: }
169:
1.9 pvalchev 170: void
171: end_screen(void)
1.1 downsj 172: {
1.18 otto 173: if (smart_terminal) {
174: move(screen_length-1, 0);
175: clrtoeol();
176: refresh();
1.17 otto 177: endwin();
1.18 otto 178: }
1.10 deraadt 179: if (is_a_terminal)
180: (void) tcsetattr(STDOUT_FILENO, TCSADRAIN, &old_settings);
1.1 downsj 181: }
182:
1.9 pvalchev 183: void
184: reinit_screen(void)
1.1 downsj 185: {
1.17 otto 186: #if 0
1.10 deraadt 187: /* install our settings if it is a terminal */
188: if (is_a_terminal)
189: (void) tcsetattr(STDOUT_FILENO, TCSADRAIN, &new_settings);
190:
191: /* send init string */
192: if (smart_terminal)
193: putcap(terminal_init);
1.17 otto 194: #endif
1.1 downsj 195: }
196:
1.9 pvalchev 197: void
198: get_screensize(void)
1.1 downsj 199: {
1.10 deraadt 200: struct winsize ws;
1.1 downsj 201:
1.10 deraadt 202: if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) != -1) {
203: if (ws.ws_row != 0)
204: screen_length = ws.ws_row;
205: if (ws.ws_col != 0)
206: screen_width = ws.ws_col - 1;
207: }
1.1 downsj 208: }
209:
1.9 pvalchev 210: void
1.17 otto 211: go_home(void)
1.1 downsj 212: {
1.10 deraadt 213: if (smart_terminal) {
1.17 otto 214: move(0, 0);
215: refresh();
1.10 deraadt 216: }
1.1 downsj 217: }
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