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outdated/sys/vms/lev_lex.h

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+/* NetHack 3.7	lev_lex.h	$NHDT-Date: 1596498300 2020/08/03 23:45:00 $  $NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.9 $ */
+/* "vms/lev_lex.h" copied into "util/stdio.h" for use in *_lex.c only!
+ * This is an awful kludge to allow util/*_lex.c made by SunOS's `lex'
+ * to be compiled as is.  (It isn't needed with `flex' or VMS POSIX
+ * `lex' and is benign when either of those configurations are used.)
+ * It works because the actual setup of yyin & yyout is performed in
+ * src/lev_main.c, where stdin & stdout are still correctly defined.
+ *
+ * The troublesome code is
+ *	#include "stdio.h"
+ *		...
+ *	FILE *yyin = stdin, *yyout = stdout;
+ * The file scope initializers with non-constant values require this
+ * hack, and the quotes instead of brackets makes it easy to do.
+ */
+
+#include <stdio.h>
+#ifdef stdin
+#undef stdin
+#endif
+#define stdin 0
+#ifdef stdout
+#undef stdout
+#endif
+#define stdout 0