Lab 9.4 completed

Labs/Lab9/ishell.c

@@ -12,8 +12,6 @@
 #include <sys/wait.h>
 #include <signal.h>
 
-#include "ishell.h"
-
 #define MAXCNT 10
 #define MAXLEN 20
 
@@ -34,10 +32,15 @@ int main (int argc, char *argv[]){
 	char* tokens2[MAXCNT];
 	char* line = NULL;		
 	size_t length;
-		
+	
+	int entertwice;
+	char * enter = NULL;
+	size_t enter_length;		
 	// Ask user for input 
 	while(1){
 
+	entertwice = -1;
+
 	printf("ishell> ");
 	
 	strcpy(path,"/usr/bin/");	
@@ -47,10 +50,17 @@ int main (int argc, char *argv[]){
 
 	//get user input from terminal  
 	getline(&line,&length,stdin);
-	length = strlen(line);
-	line[length-1] = 0;
-
+	char* arr[] = {"ls",NULL};	
+	if (line[0] == '\n'){
+		getline(&enter,&enter_length,stdin);
+		//char* arr[] = {"ls",NULL};
+		entertwice = 0;
+	}
 
+	else{
+		length = strlen(line);
+		line[length-1] = 0;
+	}
 	// initialize arrays for clean strings 
 	for (int i = 0; i<MAXCNT; i++){
 		semitokens[i] = (char*)malloc(MAXLEN);
@@ -59,7 +69,6 @@ int main (int argc, char *argv[]){
 		tokens[i] = (char*)malloc(MAXLEN);
 	}
 
-
 	// split command(s) by semicolon 
 	int semi_token_count = 0;
 	for (str = line; ; str = NULL){
@@ -120,7 +129,13 @@ int main (int argc, char *argv[]){
 
 	// child branch 
 	if (pid  == 0){
-		execv(path,tokens);
+		// enter was hit twice 
+		if (entertwice == 0){
+			execv("/usr/bin/ls",arr);
+		}
+		else{
+			execv(path,tokens);
+		}
 	}
 
 	// parent branch