/*
 * Run the 'ls' command and print the output to stdout.
 * 
 * Compile with 
 * 		gcc -Wall pipe.c -o pipe
 * 
 * 
 * Mithenks <mithenks@siena.linux.it>
 * Changes added by Jason <lcprog@lakedaemon.net>
 * 
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main() {
	
	FILE *pipe=NULL;
	char buffer[1024];
	int  rlen=0;
	int  blen=0;
	
	if ( (pipe = popen("ls","r") ) == NULL ) {
		perror("popen(): ");
		exit(-1);
	}

	/*we subtract 1 so there is always a NULL terminator*/
	blen = sizeof(buffer) - 1;

	while (1) { 
		memset(buffer,0,sizeof(buffer));

		if ( (rlen = fread(buffer,blen,1,pipe) ) != 1 ) {
			/*we have a short read or an error*/
			if ( feof(pipe) != 0 ) {
				fprintf(stderr,"Finished");
				printf("%s",buffer);
				break;
			}
			else if ( ferror(pipe) != 0 ) {
				fprintf(stderr,"Error reading from pipe.\n");
				break;
			}
			else {
				/*short read*/
				printf("%s",buffer);
			}
		}
		else {
			/*we got a full buffer*/
			printf("%s",buffer);
		}
	}

	if(pipe != NULL) {	
		pclose(pipe);
	}
	
	exit(0);
}