program to repetitively display command on crt

[Tom Dunigan]

/* display.c
 *   do screen update with given command
 *  usage is    display [-seconds] command [commandargs]
 *    examples:   display w    or   display ls -l   or   display -2 df
 *   to build, cc   with  -lcurses -ltermlib
 */

#include <stdio.h>
#include <curses.h>

char c;
char command[80];
FILE *p, *popen();
int interval=5;   /* number of seconds to pause */

main(argc,argv)
	int argc;
	char **argv;
{
	int row,i;

	if (argc==1){printf("Usage display [-seconds]  command\n");exit();}
	if (**(argv+1) == '-') {  /* interval specified */
		if (--argc == 1){printf("Usage display [-seconds] command\n");exit();}
		interval = atoi(*++argv + 1);
	}
	while(--argc>0){
		strcat(command,*++argv);
		strcat(command," ");
	}
	initscr();
	clear();
	for(;;){
		move(0,0);
		row=0;
		p=popen(command,"r");
		if (p==NULL){printf("failed\n"); exit();}
		while( (c=getc(p)) != EOF){
			if (c == '\n'){clrtoeol();move(++row,0);}
			 else addch(c);
		}
		pclose(p);
		clrtobot();
		refresh();
		sleep(interval);
	}
}