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1.1 root 1: /* conwrap.c */
2:
3: /* DOS's kbhit and getch functions for Unix - Casey Martin 2000 */
4:
5: /* $Id: conwrap.c,v 1.11 2004/11/02 22:48:50 deuce Exp $ */
6:
7: /****************************************************************************
8: * @format.tab-size 4 (Plain Text/Source Code File Header) *
9: * @format.use-tabs true (see http://www.synchro.net/ptsc_hdr.html) *
10: * *
11: * Copyright 2004 Rob Swindell - http://www.synchro.net/copyright.html *
12: * *
13: * This library is free software; you can redistribute it and/or *
14: * modify it under the terms of the GNU Lesser General Public License *
15: * as published by the Free Software Foundation; either version 2 *
16: * of the License, or (at your option) any later version. *
17: * See the GNU Lesser General Public License for more details: lgpl.txt or *
18: * http://www.fsf.org/copyleft/lesser.html *
19: * *
20: * Anonymous FTP access to the most recent released source is available at *
21: * ftp://vert.synchro.net, ftp://cvs.synchro.net and ftp://ftp.synchro.net *
22: * *
23: * Anonymous CVS access to the development source and modification history *
24: * is available at cvs.synchro.net:/cvsroot/sbbs, example: *
25: * cvs -d :pserver:[email protected]:/cvsroot/sbbs login *
26: * (just hit return, no password is necessary) *
27: * cvs -d :pserver:[email protected]:/cvsroot/sbbs checkout src *
28: * *
29: * For Synchronet coding style and modification guidelines, see *
30: * http://www.synchro.net/source.html *
31: * *
32: * You are encouraged to submit any modifications (preferably in Unix diff *
33: * format) via e-mail to [email protected] *
34: * *
35: * Note: If this box doesn't appear square, then you need to fix your tabs. *
36: ****************************************************************************/
37:
38: #if defined(__unix__)
39:
40: #include <stdlib.h>
41: #include <string.h> /* memcpy */
42: #include <unistd.h>
43: #include <termios.h>
44:
45: #if defined(__FreeBSD__)
46: #include <sys/kbio.h>
47: #elif defined(__linux__)
48: #include <sys/kd.h>
49: #endif
50:
51: #include <sys/time.h>
52: #include <sys/types.h>
53: #include <signal.h>
54:
55: #include "conwrap.h" /* Verify prototypes */
56:
57: static struct termios current; /* our current term settings */
58: static struct termios original; /* old termios settings */
59: static int beensetup = 0; /* has _termios_setup() been called? */
60: static int istty = 0; /* is stdin a tty? */
61:
62: /* Resets the termios to its previous state */
63: void _termios_reset(void)
64: {
65: tcsetattr(STDIN_FILENO, TCSANOW, &original);
66: }
67:
68: /************************************************
69: This pair of functions handles Ctrl-Z presses
70: ************************************************/
71: #if defined(__BORLANDC__)
72: #pragma argsused
73: #endif
74: void _sighandler_stop(int sig)
75: {
76: /* clean up the terminal */
77: _termios_reset();
78:
79: /* ... and stop */
80: kill(getpid(), SIGSTOP);
81: }
82: #if defined(__BORLANDC__)
83: #pragma argsused
84: #endif
85: void _sighandler_cont(int sig)
86: {
87: /* restore terminal */
88: tcsetattr(STDIN_FILENO, TCSANOW, ¤t);
89: }
90:
91:
92: /* Prepares termios for non-blocking action */
93: void _termios_setup(void)
94: {
95: beensetup = 1;
96:
97: tcgetattr(STDIN_FILENO, &original);
98:
99: memcpy(¤t, &original, sizeof(struct termios));
100: current.c_cc[VMIN] = 1; /* read() will return with one char */
101: current.c_cc[VTIME] = 0; /* read() blocks forever */
102: current.c_lflag &= ~ICANON; /* character mode */
103: current.c_lflag &= ~ECHO; /* turn off echoing */
104: tcsetattr(STDIN_FILENO, TCSANOW, ¤t);
105:
106: /* Let's install an exit function, also. This way, we can reset
107: * the termios silently
108: */
109: atexit(_termios_reset);
110:
111: /* install the Ctrl-Z handler */
112: signal(SIGTSTP, _sighandler_stop);
113: signal(SIGCONT, _sighandler_cont);
114: }
115:
116:
117: int kbhit(void)
118: {
119: fd_set inp;
120: struct timeval timeout = {0, 0};
121:
122: if(!istty) {
123: istty = isatty(STDIN_FILENO);
124: if(!istty)
125: return 0;
126: }
127:
128: if(!beensetup)
129: _termios_setup();
130:
131: /* set up select() args */
132: FD_ZERO(&inp);
133: FD_SET(STDIN_FILENO, &inp);
134:
135: if(select(STDIN_FILENO+1, &inp, NULL, NULL, &timeout)<1)
136: return 0;
137: return 1;
138: }
139:
140: int getch(void)
141: {
142: char c;
143:
144: if(!beensetup)
145: _termios_setup();
146:
147: /* get a char out of stdin */
148: read(STDIN_FILENO, &c, 1);
149:
150: return c;
151: }
152:
153: #endif /* __unix__ */
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