add elfload2

Yet another ELF loader.

src/command.c

@@ -205,6 +205,7 @@ static void perform_echo_dot(const char *arg);
 static void perform_echo(const char *arg);
 static void perform_elfexec(const char *arg);
 static void perform_elfload(const char *arg);
+static void perform_elfload2(const char *arg);
 static void perform_exit(const char *arg);
 static void perform_for(const char *arg);
 static void perform_goto(const char *arg);
@@ -261,6 +262,7 @@ struct built_in_cmd cmd_table[] =
     {"echo", perform_echo, "", "terminal output"},
     {"elfexec", perform_elfexec, "", "execute elf file"},
     {"elfload", perform_elfload, "", "load host's elf file"},
+    {"elfload2", perform_elfload2, "", "load host's elf file"},
     {"exit", perform_exit, "", "exit from interpreter"},
     {"for", perform_for, "", "FOR loop"},
     {"goto", perform_goto, "", "move to label"},
@@ -2779,6 +2781,32 @@ static void perform_elfload(const char *arg)
 #endif
   }
 
+static void perform_elfload2(const char *arg)
+  {
+#ifdef DJ64
+  char *cs;
+#endif
+  if (!arg || !arg[0])
+    {
+    cprintf("Syntax error\r\n");
+    reset_batfile_call_stack();
+    return;
+    }
+#ifdef DJ64
+  cs = getenv("COMSPEC");
+  if (!cs)
+    {
+    printf("COMSPEC not set\n");
+    return;
+    }
+  setenv("ELFLOAD", arg, 1);
+  perform_external_cmd(false, false, cs);
+  unsetenv("ELFLOAD");
+#else
+  printf("elfload2 unsupported\n");
+#endif
+  }
+
 static void perform_break(const char *arg)
   {
   if (stricmp(arg, "off") == 0)