Replace NULL macro defs with null.h include

include/locale.h

@@ -31,7 +31,7 @@ struct lconv {
   char n_sign_posn;		/* CHAR_MAX */
 };
 
-#define NULL    ((void *)0)
+#include <sys/null.h>
 
 #define LC_ALL             1
 #define LC_COLLATE         2

include/minix/const.h

@@ -44,7 +44,8 @@
 
 #define SUPER_USER ((uid_t) 0)	/* uid_t of superuser */
 
-#define NULL     ((void *)0)	/* null pointer */
+#include <sys/null.h>      /* NULL Pointer */
+
 #define SCPVEC_NR	  64	/* max # of entries in a SYS_VSAFECOPY* request */
 #define NR_IOREQS	  64
 				/* maximum number of entries in an iorequest */

include/stddef.h

@@ -3,7 +3,7 @@
 #ifndef _STDDEF_H
 #define _STDDEF_H
 
-#define NULL   ((void *)0)
+#include <sys/null.h>
 
 /* The following is not portable, but the compiler accepts it. */
 #define offsetof(type, ident)	((size_t) (unsigned long) &((type *)0)->ident)

include/stdio.h

@@ -13,6 +13,8 @@
 #include <ansi.h>
 #endif
 
+#include <sys/null.h>   /* For NULL */
+
 /*
  * Focus point of all stdio activity.
  */
@@ -50,7 +52,6 @@ typedef struct __iobuf {
 #define	stderr		(&__stderr)
 
 #define	BUFSIZ		4096
-#define	NULL		((void *)0)
 #define	EOF		(-1)
 
 #define	FOPEN_MAX	20

include/stdlib.h

@@ -7,8 +7,7 @@
 #include <ansi.h>
 #endif
 
-/* The macros are NULL, EXIT_FAILURE, EXIT_SUCCESS, RAND_MAX, and MB_CUR_MAX.*/
-#define NULL    ((void *)0)
+#include <sys/null.h>
 
 #define EXIT_FAILURE       1	/* standard error return using exit() */
 #define EXIT_SUCCESS       0	/* successful return using exit() */

include/time.h

@@ -9,14 +9,14 @@
 #ifndef _TIME_H
 #define _TIME_H
 
+#include <sys/null.h>
+
 #define CLOCKS_PER_SEC    60
 
 #ifdef _POSIX_SOURCE
 #define CLK_TCK CLOCKS_PER_SEC	/* obsolescent mame for CLOCKS_PER_SEC */
 #endif
 
-#define NULL    ((void *)0)
-
 #ifndef _SIZE_T
 #define _SIZE_T
 typedef unsigned int size_t;

include/unistd.h

@@ -55,7 +55,7 @@
 #define SI_PROCPUB_TAB	   11	/* copy of public entries of process table */
 
 /* NULL must be defined in <unistd.h> according to POSIX Sec. 2.7.1. */
-#define NULL    ((void *)0)
+#include <sys/null.h>
 
 /* The following relate to configurable system variables. POSIX Table 4-2. */
 #define _SC_ARG_MAX	   1