Removed submodules

lab2-cmd/model.h

@@ -0,0 +1,75 @@
+#ifndef __model_h__
+#define __model_h__
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+// Generic definitions for any type of statemodel
+
+// States and events should just be integers
+typedef int state_t;
+typedef int event_t;
+
+// Needed for circular typedef. This lets action_t use fsm_t in its parameter
+// list, while the struct fsm can use action_t as a field.
+typedef struct fsm fsm_t;
+
+// All entry, exit, and effect instances use the action type
+typedef void (*action_t) (fsm_t *);
+
+// Each FSM instance contains a current state
+struct fsm
+{
+  state_t state; // current state
+
+  // pointer to the FSM's transition function
+  state_t (*transition) (struct fsm *, event_t, action_t *);
+
+  // Additional data fields specific to this FSM
+  char *command;       // the name of the command to run
+  size_t nargs;        // the number of command-line arguments
+  char **args;         // the command-line arguments
+  char *current_token; // current token being processed
+};
+
+// Generic entry point for handling events
+bool handle_event (fsm_t *, event_t);
+
+// Additional definitions specific to an FSM for command line processing
+
+#define MAX_ARGUMENTS 10
+
+// Events
+typedef enum
+{
+  TOKEN,   // normal command-line token
+  PIPE,    // vertical bar character
+  NEWLINE, // newline at the end of the command
+  NIL      // invalid non-event
+} cmdevt_t;
+#define NUM_EVENTS NIL
+
+// States
+typedef enum
+{
+  Init,      // initial state
+  Command,   // establishing the command name
+  Arguments, // building the argument list
+  Make_Pipe, // linking the commands together for a pipe
+  Term,      // terminal state (execute program or error)
+  NST        // invalid non-state
+} cmdst_t;
+#define NUM_STATES NST
+
+// Helper functions
+fsm_t *cmdline_init (void); // initialize the FSM
+state_t transition (struct fsm *fsm, event_t event, action_t *effect);
+event_t lookup (char *); // convert an event string to its numeric value
+
+// Translate event/state numbers to their string equivalent
+const char *event_name (event_t);
+const char *state_name (state_t);
+
+#endif