add environ builtin

src/builtins.c

@@ -30,6 +30,10 @@ bool is_builtin(char *command) {
         return true;
     }
 
+    if (strcmp(command, "environ") == 0) {
+        return true;
+    }
+
     return false;
 }
 
@@ -40,6 +44,9 @@ void run_builtin(StringArray *args) {
     else if (strcmp(args->array[0], "cd") == 0) {
         change_directory(args);
     }
+    else if (strcmp(args->array[0], "environ") == 0) {
+        print_environ(args);
+    }
     else {
         fprintf(stderr, "Builtin %s does not exist!\n", args->array[0]);
     }
@@ -72,3 +79,13 @@ void change_directory(StringArray *args) {
         }
     }
 }
+
+void print_environ(StringArray *args) {
+    if (args->size > 1) {
+        fprintf(stderr, "Too many arguments!\n");
+        return;
+    }
+    for (size_t i = 0; i < variables->size; i++) {
+        fprintf(stdout, "%s=%s\n", variables->keys->array[i], variables->values->array[i]);
+    }
+}

src/include/builtins.h

@@ -44,4 +44,10 @@ void exit_shell(StringArray *args);
  */
 void change_directory(StringArray *args);
 
+/**
+ * Print all of the environment variables.
+ * @param args The arguments the user input.
+ */
+void print_environ(StringArray * args);
+
 #endif