--- ray/src/common/standard.h	1989/02/02 10:34:23	1.1
+++ ray/src/common/standard.h	1990/01/18 23:58:53	1.3
@@ -22,6 +22,13 @@
 #else
 #define  PI		3.14159265358979323846
 #endif
+
+#ifndef  F_OK			/* mode bits for access(2) call */
+#define  R_OK		4		/* readable */
+#define  W_OK		2		/* writable */
+#define  X_OK		1		/* executable */
+#define  F_OK		0		/* exists */
+#endif
 				/* error codes */
 #define  WARNING	1		/* non-fatal error */
 #define  USER		2		/* fatal user-caused error */
@@ -33,6 +40,19 @@
 extern char  errmsg[];			/* global buffer for error messages */
 
 extern int  errno;			/* system error number */
+
+					/* memory operations */
+#ifdef  STRUCTASSIGN
+#define  copystruct(d,s)	(*(d) = *(s))
+#else
+#define  copystruct(d,s)	bcopy((char *)(s),(char *)(d),sizeof(*(d)))
+#endif
+#ifndef  BSD
+#define  bcopy(s,d,n)		(void)memcpy(d,s,n)
+#define  bzero(d,n)		(void)memset(d,0,n)
+#define  bcmp(b1,b2,n)		memcmp(b1,b2,n)
+extern char  *memcpy(), *memset();
+#endif
 
 extern char  *sskip();
 extern char  *getpath();