Afloyd.136
net.sources
utcsrgv!utzoo!decvax!duke!harpo!floyd!trb
Thu Mar 25 14:04:22 1982
upd.c A screen updating program
Please let me know if you have better ideas. -Andy
----------
/*
 * cc upd.c -lcurses -ltermcap -o upd
 *
 * upd.c - popen a process and use its output to update the screen
 * argv[1] is popen'ed so quote your command if it's more than one arg.
 * argv[2] is number of seconds to sleep between cycles.
 * Andy Tannenbaum WECo/BTL Whippany, NJ
 */
#include<CURSES.H>
#include<SYS/IOCTL.H>
/* 6*1024 is more than 66*80 */
#define BUFSIZE 6*1024
FILE *pp;	/* popen pointer */
char buf[BUFSIZE];
char tbuf[128];
long larg;
main(argc,argv)
int argc; char **argv;
{
	extern char *CD;
	int i,n,sleeptime;

	/* sleep for sleeptime seconds between cycles */
	sleeptime = (argc > 1) ? atol(argv[2]) : 1;
	initscr();

	for(;;){
#ifdef VMUNIX
		/* redraw whole screen when user types a newline */
		/* can be done on UNIX 3.0 too, but I don't */
		ioctl(0,FIONREAD,&larg);
		if(larg != 0L){
			read(0,tbuf,128);
			clear();
		}
#endif
		/* if popen fails we're hurting, so break */
		if((pp=popen(argv[1],"r")) == EOF)exit(1);
		n=fread(buf,1,BUFSIZE,pp);
		buf[n]=0;
		pclose(pp);
		mvaddstr(0,0,buf);
		refresh();
		/* my curses doesn't seem to clear the rest of the screen when
		 * data disappears from it, but it leaves the cursor down
		 * there, so diy */
		printf("%s",CD);

		for(i=0;i<N;I++)BUF[N]=0; } ---------- </PRE SLEEP(SLEEPTIME);>
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This Usenet Oldnews Archive
article may be copied and distributed freely, provided:

1. There is no money collected for the text(s) of the articles.

2. The following notice remains appended to each copy:

The Usenet Oldnews Archive: Compilation Copyright (C) 1981, 1996 
 Bruce Jones, Henry Spencer, David Wiseman.