/* * * Copyright (c) Sigma Designs, Inc. 2003. All rights reserved. * *//**	@file get_key.c	@brief non-blocking character read from terminal		@author Christian Wolff*/#include <stdio.h>#include <stdlib.h>#include <sys/types.h>#include <sys/time.h>#include <unistd.h>#include <termios.h>#include <signal.h>#include "rmdef/rmdef.h"#include "samples/get_key.h"static struct termios tio_save;static RMuint32 init_count = 0;static RMuint32 exit_count = 0;static void (*terminate)(void *param) = NULL;void *g_param;static void sig_handler(int signo){	if (exit_count++) {		RMDBGLOG((ENABLE, "Signal %d during cleanup, exiting unclean!\n", signo));		exit(1);	}	RMDBGLOG((ENABLE, "Signal %d, exiting...\n", signo));	RMTermExit();	if (terminate) (*terminate)(g_param);	exit(0);}void RMTermInit(RMbool block_int){	struct termios tio;		if (init_count++) return;	if (tcgetattr(STDIN_FILENO, &tio_save) < 0) {		init_count--;		return;	}	tio = tio_save;	if (block_int) {		tio.c_lflag &= ~(ECHO | ICANON | ISIG);		tio.c_iflag &= ~(BRKINT);	} else {		tio.c_lflag |= (ISIG);		tio.c_lflag &= ~(ECHO | ICANON);		tio.c_iflag |= (BRKINT);		tio.c_iflag &= ~(IGNBRK);	}		/* 	   arrows or F1 characters generate a sequence of 3 characters in a row:	   like ESC [ A (up arrow).	   	   To avoid reading [ or A as an individual character, we set	   an inter character interval of 1/10 second. If characters	   are received in less of 1/10 second then it is treated as	   an individual character and is discard.	*/		tio.c_cc[VMIN] = 3;   /* up to 3 chars at a time */	tio.c_cc[VTIME] = 1;  /* after receiving 1 char and after a delay of 1/10 second, 'read' returns */	tcsetattr(STDIN_FILENO, TCSAFLUSH, &tio);}void RMTermExit(void){	if (--init_count) return;	tcsetattr(STDIN_FILENO, TCSAFLUSH, &tio_save);}void RMSignalInit(void (*cleanup)(void *param), void *param){	terminate = cleanup;	g_param = param;		if (signal(SIGBUS, sig_handler) == SIG_ERR) RMDBGLOG((ENABLE, "Can't catch SIGBUS!\n"));#ifdef SIGEMT	if (signal(SIGEMT, sig_handler) == SIG_ERR) RMDBGLOG((ENABLE, "Can't catch SIGEMT!\n"));#endif	if (signal(SIGFPE, sig_handler) == SIG_ERR) RMDBGLOG((ENABLE, "Can't catch SIGFPE!\n"));	if (signal(SIGHUP, sig_handler) == SIG_ERR) RMDBGLOG((ENABLE, "Can't catch SIGHUP!\n"));	if (signal(SIGILL, sig_handler) == SIG_ERR) RMDBGLOG((ENABLE, "Can't catch SIGILL!\n"));	if (signal(SIGINT, sig_handler) == SIG_ERR) RMDBGLOG((ENABLE, "Can't catch SIGINT!\n"));	if (signal(SIGIOT, sig_handler) == SIG_ERR) RMDBGLOG((ENABLE, "Can't catch SIGIOT!\n"));	if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) RMDBGLOG((ENABLE, "Can't catch SIGPIPE!\n"));	if (signal(SIGQUIT, sig_handler) == SIG_ERR) RMDBGLOG((ENABLE, "Can't catch SIGQUIT!\n"));	if (signal(SIGSEGV, sig_handler) == SIG_ERR) RMDBGLOG((ENABLE, "Can't catch SIGSEGV!\n"));	if (signal(SIGSYS, sig_handler) == SIG_ERR) RMDBGLOG((ENABLE, "Can't catch SIGSYS!\n"));	if (signal(SIGTERM, sig_handler) == SIG_ERR) RMDBGLOG((ENABLE, "Can't catch SIGTERM!\n"));	if (signal(SIGTRAP, sig_handler) == SIG_ERR) RMDBGLOG((ENABLE, "Can't catch SIGTRAP!\n"));	if (signal(SIGUSR1, sig_handler) == SIG_ERR) RMDBGLOG((ENABLE, "Can't catch SIGUSR1!\n"));	if (signal(SIGUSR2, sig_handler) == SIG_ERR) RMDBGLOG((ENABLE, "Can't catch SIGUSR2!\n"));}RMbool RMKeyAvailable(void){	struct timeval tv;	fd_set readfds;		tv.tv_sec = 0;	tv.tv_usec = 0;	FD_ZERO(&readfds);	FD_SET(STDIN_FILENO, &readfds);	return (select(STDIN_FILENO + 1, &readfds, NULL, NULL, &tv) > 0);}RMascii RMGetKey(void){	RMascii Key[3];	if (read(STDIN_FILENO, Key, 3) == 1) return Key[0];	return '\0';}RMbool RMGetKeyNoWait(RMascii *pKey){	RMascii Key[3];	if (! RMKeyAvailable()) return FALSE;	if (pKey == NULL) return FALSE;	if (read(STDIN_FILENO, Key, 3) == 1) {		*pKey = Key[0];		return TRUE;	}		return FALSE;}void RMTermEnableEcho(){	static struct termios tio;	if (tcgetattr(STDIN_FILENO, &tio) < 0) {		return;	}	tio.c_lflag |= ECHO | ICANON;	tcsetattr(STDIN_FILENO, TCSAFLUSH, &tio);}void RMTermDisableEcho(){	static struct termios tio;	if (tcgetattr(STDIN_FILENO, &tio) < 0) {		return;	}	tio.c_lflag &=  ~( ECHO | ICANON );	tcsetattr(STDIN_FILENO, TCSAFLUSH, &tio);}void RMTermGetUint32(RMuint32 *data){/* 	static struct termios tio; */ 	RMbool handle_echo = FALSE; 		RMuint32 i = 0;	RMascii buffer[31];	RMascii key;	if (data == NULL)		return;/* 	if ( tcgetattr(STDIN_FILENO, &tio) == 0 && (tio.c_lflag & ( ECHO | ICANON )) == 0 ) 		handle_echo = TRUE; */ 	if (handle_echo)	  		RMTermEnableEcho();  try_again:	buffer[0] = '\0';	while (i < 31) {		if (RMKeyAvailable()) {			key = RMGetKey();			printf("%c", key); fflush(stdout); //echo			if ((key >= '0') && (key <= '9')) {				buffer[i++] = key;				buffer[i] = '\0';			}			if (key == '\n') {				buffer[i] = '\0';				break;			}		}	}	RMDBGLOG((DISABLE, "read '%s'\n", buffer));	sscanf(buffer, "%lu", data);	RMDBGLOG((DISABLE, "scanned %lu\n", *data));	if (i < 1) {		fprintf(stderr, "you must enter a number\n");		goto try_again;	}	if (handle_echo)		RMTermDisableEcho();	return;}