wgetch.c

unix环境下c语言屏幕编程开发

#include "../inc/screen.h"

void    (*istat)() ;
int	wsigflag = 0;
static	unsigned	char	wch0 = 0;
jmp_buf	wbuf;

static void escproc( signo )
int signo ;
{
	alarm(0);
	wsigflag = 1;
	longjmp(wbuf,1);
}

unsigned	char	wgetch()
{
	int	alarm0;
	unsigned	char   ch;
	char	chx;
	struct  timeb tx;

	wsigflag = 0;

	if(wch0 != 0)
	{
		ch = wch0;
		wch0 = 0;
		return(ch);
	}

	do
	{
		chx = getchar();
	}
	while(chx == ERR && errno == EINTR);

	ch = (unsigned	char)chx;

	if(ch != ESC)
		return(ch);

	istat = signal(SIGALRM,escproc);

	ftime(&tx);
	if(tx.millitm > 500)
		alarm0 = alarm(2);
	else
		alarm0 = alarm(1);

	setjmp(wbuf);

	if(wsigflag != 0)
	{
		signal(SIGALRM,istat);
		alarm(0);
		return(ESC);
	}

	ch = wgetchar();
	
	if(ch != '[')
	{
		signal(SIGALRM,istat);
		alarm(0);
		wch0 = ch;
		return(ESC);
	}

	ch = wgetchar();

	signal(SIGALRM,istat);
	alarm(0);

	switch(ch)
	{
		case 'A': /* Up */ return(128); break;
		case 'B': /* Down */ return(129); break;
		case 'D': /* Left */ return(130); break;
		case 'C':  /* Right */ return(131); break;
		case 'H': /* Home */ return(132); break;
		default: return(ESC);
	}
}

char	wgetchar()
{
	char	chx;

	do
	{
		chx = getchar();
	}
	while(chx == ERR && errno == EINTR);

	return(chx);
}

void wprt(fp,str,n)
FILE	*fp;
char	*str;
int	n;
{
	while(n--)
		fprintf(fp,"%s",str);
}

wsleep(num)
int	num;
{
	long	num0;
	struct timeb wtp0,wtp1;

	num0 = (long)num * 1000l;
	ftime(&wtp0);
	do{
		if(num0 - (wtp1.time - wtp0.time) * 1000l > 1000l)
			sleep(1);
		ftime(&wtp1);
	}while(num0 - (wtp1.time - wtp0.time) * 1000l > 0l);
}