2 files changed, 33 insertions, 4 deletions
diff --git a/include/command.h b/include/command.h
index f44c103..2948aca 100644
--- a/include/command.h
+++ b/include/command.h
@@ -11,16 +11,16 @@
 #include "config.h"
 
 typedef struct command {
-  char *command;
-  char *infile;
-  char *outfile;
+  const char *command;
+  const char *infile;
+  const char *outfile;
   struct command *next;
   struct command *prev;
   pid_t pid;
 
   int pipe[2];
 
-  char *args[MAX_ARGUMENT_CNT + 2];
+  const char *args[MAX_ARGUMENT_CNT + 2];
 } command;
 
 
diff --git a/include/variables.h b/include/variables.h
new file mode 100644
index 0000000..7511690
--- /dev/null
+++ b/include/variables.h
@@ -0,0 +1,29 @@
+/*
+ *
+ */
+#ifndef H_HUSH_VARIABLES
+#define H_HUSH_VARIABLES
+
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "strmap.h"
+#include "hashfuncs.h"
+
+static inline bool is_variable(const char *token) {
+  return (token) ? token[0] == '$' : false;
+}
+
+bool init_variable_store(void);
+
+bool add_variable(const char *key, const char *val);
+
+const char *get_variable(const char *key);
+
+bool promote_variable_to_env(const char *key);
+
+void destroy_variable_store();
+
+
+#endif