Add an (exit) method.

diff --git a/usr.bin/mg/interpreter.c b/usr.bin/mg/interpreter.c
index 713d0a4..62bfe66 100644 (file)
--- a/usr.bin/mg/interpreter.c
+++ b/usr.bin/mg/interpreter.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: interpreter.c,v 1.15 2021/03/25 16:58:46 lum Exp $   */
+/*      $OpenBSD: interpreter.c,v 1.16 2021/03/25 17:31:21 lum Exp $   */
 /*
  * This file is in the public domain.
  *
@@ -71,6 +71,7 @@ static int     foundvar(char *);
 static int      doregex(char *, char *);
 static int      parseexp(char *);
 static void     clearexp(void);
+static int      exitinterpreter(void);
 
 TAILQ_HEAD(exphead, expentry) ehead;
 struct expentry {
@@ -296,6 +297,11 @@ parseexp(char *funstr)
         if (doregex(regs, funstr))
                 return(dobeep_msg("Invalid use of define"));
 
+       /* Exit? */
+       regs = "^exit$";
+       if (doregex(regs, funstr))
+               return(exitinterpreter());
+
        return(multiarg(funstr));
 }
 
@@ -593,3 +599,16 @@ doregex(char *r, char *e)
        regfree(&regex_buff);
        return(FALSE);
 }
+
+/*
+ * Display a message so it is apparent that this is the method which stopped
+ * execution.
+ */
+static int
+exitinterpreter()
+{
+       cleanup();
+       if (batch == 0)
+               return(dobeep_msg("Interpreter exited via exit command."));
+       return(FALSE);
+}