+typedef struct environment {
+ int n;
+ int size;
+ char **entries;
+} environment_t;
+
+extern int environment_add(environment_t *env, const char *format, ...);
+extern int environment_placeholder(environment_t *env);
+extern void environment_update(environment_t *env, int pos, const char *format, ...);
+extern void environment_init(environment_t *env);
+extern void environment_exit(environment_t *env);
+
+extern bool execute_script(const char *name, environment_t *env);