Move _shell_var shell function to shell_var C applet

src/Makefile

@@ -69,7 +69,8 @@ RC_BINLINKS = einfon einfo ewarnn ewarn eerrorn eerror ebegin eend ewend \
 			  service_inactive service_wasinactive \
 			  service_coldplugged service_started_daemon \
 			  checkpath fstabinfo mountinfo rc-depend \
-			  service_get_value service_set_value get_options save_options 
+			  service_get_value service_set_value get_options save_options \
+			  shell_var
 RC_SBINLINKS =  mark_service_starting mark_service_started \
 				mark_service_stopping mark_service_stopped \
 				mark_service_inactive mark_service_wasinactive \

src/rc.c

@@ -457,6 +457,28 @@ static int do_value (int argc, char **argv)
 	return (ok ? EXIT_SUCCESS : EXIT_FAILURE);
 }
 
+static int do_shell_var (int argc, char **argv)
+{
+	int i;
+
+	for (i = 0; i < argc; i++) {
+		char *p = argv[i];
+
+		if (i != 0)
+			putchar (' ');
+
+		while (*p) {
+			char c = *p++;
+			if (! isalnum (c))
+				c = '_';
+			putchar (c);
+		}
+	}
+	putchar ('\n');
+
+	return (EXIT_SUCCESS);
+}
+
 #ifdef __linux__
 static char *proc_getent (const char *ent)
 {
@@ -903,6 +925,9 @@ int main (int argc, char **argv)
 	else if (strcmp (applet, "is_runlevel_stop") == 0)
 		exit (rc_runlevel_stopping () ? 0 : 1);
 
+	if (strcmp (applet, "shell_var") == 0)
+		exit (do_shell_var (argc, argv));
+
 	if (strcmp (applet, "rc-abort") == 0) {
 		char *p = getenv ("RC_PID");
 		pid_t pid = 0;