Annotation of src/usr.bin/top/screen.c, Revision 1.11
1.11 ! deraadt 1: /* $OpenBSD: screen.c,v 1.10 2003/06/12 23:09:30 deraadt 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.
33: *
34: * Paul Vixie, February 1987: converted to use ioctl() instead of stty/gtty.
35: *
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>
43: #include <stdio.h>
44: #include <stdlib.h>
1.3 millert 45: #include <string.h>
1.2 downsj 46: #include <term.h>
47: #include <termios.h>
48: #include <unistd.h>
49:
1.1 downsj 50: #include "top.h"
51: #include "screen.h"
52: #include "boolean.h"
53:
1.11 ! deraadt 54: extern char *__progname;
1.1 downsj 55:
1.10 deraadt 56: int overstrike;
57: int screen_length;
58: int screen_width;
59: char ch_erase;
60: char ch_kill;
61: char smart_terminal;
62: char PC;
63: char string_buffer[1024];
64: char home[15];
65: char lower_left[15];
66: char *clear_line;
67: char *clear_scr;
68: char *clear_to_end;
69: char *cursor_motion;
70: char *start_standout;
71: char *end_standout;
72: char *terminal_init;
73: char *terminal_end;
74: short ospeed;
1.1 downsj 75:
76: static struct termios old_settings;
77: static struct termios new_settings;
1.2 downsj 78:
1.10 deraadt 79: static char is_a_terminal = No;
1.1 downsj 80:
1.9 pvalchev 81: void
82: init_termcap(int interactive)
1.1 downsj 83: {
1.10 deraadt 84: char *bufptr, *PCptr, *term_name;
85: int status;
86:
87: /* set defaults in case we aren't smart */
88: screen_width = MAX_COLS;
89: screen_length = 0;
90:
91: if (!interactive) {
92: /* pretend we have a dumb terminal */
93: smart_terminal = No;
94: return;
95: }
96: /* assume we have a smart terminal until proven otherwise */
97: smart_terminal = Yes;
98:
99: /* get the terminal name */
100: term_name = getenv("TERM");
101:
102: /* if there is no TERM, assume it's a dumb terminal */
103: /* patch courtesy of Sam Horrocks at telegraph.ics.uci.edu */
104: if (term_name == NULL) {
105: smart_terminal = No;
106: return;
107: }
108:
109: /* now get the termcap entry */
110: if ((status = tgetent(NULL, term_name)) != 1) {
111: if (status == -1)
1.11 ! deraadt 112: fprintf(stderr, "%s: can't open termcap file\n", __progname);
1.10 deraadt 113: else
114: fprintf(stderr, "%s: no termcap entry for a `%s' terminal\n",
1.11 ! deraadt 115: __progname, term_name);
1.10 deraadt 116:
117: /* pretend it's dumb and proceed */
118: smart_terminal = No;
119: return;
1.1 downsj 120: }
1.10 deraadt 121:
122: /* "hardcopy" immediately indicates a very stupid terminal */
123: if (tgetflag("hc")) {
124: smart_terminal = No;
125: return;
126: }
127: /* set up common terminal capabilities */
128: if ((screen_length = tgetnum("li")) <= Header_lines) {
129: screen_length = smart_terminal = 0;
130: return;
131: }
132:
133: /* screen_width is a little different */
134: if ((screen_width = tgetnum("co")) == -1)
135: screen_width = 79;
1.1 downsj 136: else
1.10 deraadt 137: screen_width -= 1;
138:
139: /* terminals that overstrike need special attention */
140: overstrike = tgetflag("os");
141:
142: /* initialize the pointer into the termcap string buffer */
143: bufptr = string_buffer;
144:
145: /* get "ce", clear to end */
146: if (!overstrike) {
147: clear_line = tgetstr("ce", &bufptr);
148: }
149: /* get necessary capabilities */
150: if ((clear_scr = tgetstr("cl", &bufptr)) == NULL ||
151: (cursor_motion = tgetstr("cm", &bufptr)) == NULL) {
152: smart_terminal = No;
153: return;
154: }
155: /* get some more sophisticated stuff -- these are optional */
156: clear_to_end = tgetstr("cd", &bufptr);
157: terminal_init = tgetstr("ti", &bufptr);
158: terminal_end = tgetstr("te", &bufptr);
159: start_standout = tgetstr("so", &bufptr);
160: end_standout = tgetstr("se", &bufptr);
161:
162: /* pad character */
163: PC = (PCptr = tgetstr("pc", &bufptr)) ? *PCptr : 0;
164:
165: /* set convenience strings */
166: (void) strlcpy(home, tgoto(cursor_motion, 0, 0), sizeof(home));
167: /* (lower_left is set in get_screensize) */
168:
169: /* get the actual screen size with an ioctl, if needed */
170: /*
171: * This may change screen_width and screen_length, and it always sets
172: * lower_left.
173: */
174: get_screensize();
175:
176: /* if stdout is not a terminal, pretend we are a dumb terminal */
177: if (tcgetattr(STDOUT_FILENO, &old_settings) == -1)
178: smart_terminal = No;
1.1 downsj 179: }
180:
1.9 pvalchev 181: void
182: init_screen(void)
1.1 downsj 183: {
1.10 deraadt 184: /* get the old settings for safe keeping */
185: if (tcgetattr(STDOUT_FILENO, &old_settings) != -1) {
186: /* copy the settings so we can modify them */
187: new_settings = old_settings;
188:
189: /* turn off ICANON, character echo and tab expansion */
190: new_settings.c_lflag &= ~(ICANON | ECHO);
191: new_settings.c_oflag &= ~(OXTABS);
192: new_settings.c_cc[VMIN] = 1;
193: new_settings.c_cc[VTIME] = 0;
194: (void) tcsetattr(STDOUT_FILENO, TCSADRAIN, &new_settings);
195:
196: /* remember the erase and kill characters */
197: ch_erase = old_settings.c_cc[VERASE];
198: ch_kill = old_settings.c_cc[VKILL];
199:
200: /* remember that it really is a terminal */
201: is_a_terminal = Yes;
202:
203: /* send the termcap initialization string */
204: putcap(terminal_init);
205: }
206: if (!is_a_terminal) {
207: /* not a terminal at all---consider it dumb */
208: smart_terminal = No;
209: }
1.1 downsj 210: }
211:
1.9 pvalchev 212: void
213: end_screen(void)
1.1 downsj 214: {
1.10 deraadt 215: /* move to the lower left, clear the line and send "te" */
216: if (smart_terminal) {
217: putcap(lower_left);
218: putcap(clear_line);
219: fflush(stdout);
220: putcap(terminal_end);
221: }
222:
223: /* if we have settings to reset, then do so */
224: if (is_a_terminal)
225: (void) tcsetattr(STDOUT_FILENO, TCSADRAIN, &old_settings);
1.1 downsj 226: }
227:
1.9 pvalchev 228: void
229: reinit_screen(void)
1.1 downsj 230: {
1.10 deraadt 231: /* install our settings if it is a terminal */
232: if (is_a_terminal)
233: (void) tcsetattr(STDOUT_FILENO, TCSADRAIN, &new_settings);
234:
235: /* send init string */
236: if (smart_terminal)
237: putcap(terminal_init);
1.1 downsj 238: }
239:
1.9 pvalchev 240: void
241: get_screensize(void)
1.1 downsj 242: {
1.10 deraadt 243: struct winsize ws;
1.1 downsj 244:
1.10 deraadt 245: if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) != -1) {
246: if (ws.ws_row != 0)
247: screen_length = ws.ws_row;
248: if (ws.ws_col != 0)
249: screen_width = ws.ws_col - 1;
250: }
251: (void) strlcpy(lower_left, tgoto(cursor_motion, 0, screen_length - 1),
252: sizeof(lower_left));
1.1 downsj 253: }
254:
1.9 pvalchev 255: void
256: standout(char *msg)
1.1 downsj 257: {
1.10 deraadt 258: if (smart_terminal) {
259: putcap(start_standout);
260: if (fputs(msg, stdout) == EOF)
261: exit(1);
262: putcap(end_standout);
263: } else {
264: if (fputs(msg, stdout) == EOF)
265: exit(1);
266: }
1.1 downsj 267: }
268:
1.10 deraadt 269: void
270: clear()
1.1 downsj 271: {
1.10 deraadt 272: if (smart_terminal)
273: putcap(clear_scr);
1.1 downsj 274: }
275:
1.9 pvalchev 276: int
277: clear_eol(int len)
1.1 downsj 278: {
1.10 deraadt 279: if (smart_terminal && !overstrike && len > 0) {
280: if (clear_line) {
281: putcap(clear_line);
282: return (0);
283: } else {
284: while (len-- > 0) {
285: if (putchar(' ') == EOF)
286: exit(1);
287: }
288: return (1);
289: }
1.1 downsj 290: }
1.10 deraadt 291: return (-1);
1.1 downsj 292: }
293:
1.9 pvalchev 294: void
295: go_home(void)
1.1 downsj 296: {
1.10 deraadt 297: if (smart_terminal)
298: putcap(home);
1.1 downsj 299: }
300:
301: /* This has to be defined as a subroutine for tputs (instead of a macro) */
1.9 pvalchev 302: int
303: putstdout(int ch)
1.1 downsj 304: {
1.10 deraadt 305: int ret;
1.7 deraadt 306:
1.10 deraadt 307: ret = putchar(ch);
308: if (ret == EOF)
309: exit(1);
310: return (ret);
1.1 downsj 311: }
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