assignment 1

scanner.h

@@ -0,0 +1,37 @@
+#ifndef SCANNER_H
+#define SCANNER_H
+
+#define INITIAL_STRING_SIZE 10
+
+// This enum denotes what type of variable a token is.
+enum Type {
+  EXECUTABLE,    // a command in either $CWD or $PATH
+  OPTION,        // any options to pass to an executable or builtin
+  COMPOSITION,   // '&&', '||', ';', '\n'
+  BUILTIN,       // one of a few pre-defined builtin executables 
+  PIPELINE,      // '|'
+  REDIRECT,      // '<' or '>'
+  BACKGROUND,    // '&'
+  FILENAME       // a file (for redirection)
+};
+
+typedef struct ListNode *List;
+
+typedef struct ListNode {
+    char *t;
+    enum Type type;    
+    List next;
+} ListNode;
+
+
+char *readInputLine();
+
+List getTokenList(char *s);
+
+bool isEmpty(List l);
+
+void printList(List l);
+
+void freeTokenList(List l);
+
+#endif