Step 5: MyShell

MyShell.c

@@ -0,0 +1,28 @@
+#include "cse356header.h"
+#include "readline.c"
+#define MAX_ARGS 50
+
+main()
+{
+	while (true) {
+		int argc;
+		char *argv[MAX_ARGS];
+
+		write(1, "$ ", 2);
+		char buffer[256];
+		readline(0, buffer, 255);
+		buffer[strlen(buffer) - 1] = '\0'; // get rid of cr
+		if(strcmp("exit", buffer) == 0) exit(0);
+		pid_t forkpid;
+		forkpid = fork();
+
+		if(forkpid == 0) { // child process 
+			argv[0] = buffer; argv[1] = NULL;
+			execvp(argv[0], argv);
+			exit(0);
+		}
+		wait(NULL);
+
+	}
+	exit(0);
+}

makefile

@@ -1,4 +1,4 @@
-all: MyCopy ForkCopy PipeCopy timer
+all: MyCopy ForkCopy PipeCopy timer MyShell
 clear:
 	rm *.o
 MyCopy: MyCopy.o
@@ -17,3 +17,7 @@ timer: timer.o
 	g++ timer.o -o timer
 timer.o:
 	g++ -c timer.c
+MyShell: MyShell.o
+	g++ MyShell.o -o MyShell
+MyShell.o: 
+	g++ -c MyShell.c

readline.c

@@ -1,7 +1,6 @@
-#include	"unp.h"
 
 ssize_t
-readline(int fd, void *vptr, size_t maxlen)
+readline(int fd, char *vptr, size_t maxlen)
 {
 	ssize_t	n, rc;
 	char	c, *ptr;
@@ -23,4 +22,4 @@ readline(int fd, void *vptr, size_t maxlen)
 
 	*ptr = 0;
 	return(n);
-}
+}