Rework source layout in preparation for modular sudo.

include/error.h

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2004 Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef _SUDO_ERROR_H_
+#define	_SUDO_ERROR_H_
+
+#ifdef __STDC__
+# include <stdarg.h>
+void	error(int, const char *, ...) __attribute__((__noreturn__));
+void	errorx(int, const char *, ...) __attribute__((__noreturn__));
+void	warning(const char *, ...);
+void	warningx(const char *, ...);
+#else
+# include <varargs.h>
+void	error() __attribute__((__noreturn__));
+void	errorx() __attribute__((__noreturn__));
+void	warning();
+void	warningx();
+#endif /* __STDC__ */
+
+#endif /* _SUDO_ERROR_H_ */