BSD 4_3_Net_2 release

[unix-history] / usr / src / include / struct.h

diff --git a/usr/src/include/struct.h b/usr/src/include/struct.h
index 2486388..e641a2d 100644 (file)
--- a/usr/src/include/struct.h
+++ b/usr/src/include/struct.h
@@ -1,9 +1,51 @@
-/*     struct.h        4.1     83/05/03        */
-
-/*
- * access to information relating to the fields of a structure
+/*-
+ * Copyright (c) 1983 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *     @(#)struct.h    5.2 (Berkeley) 4/3/91

  */
 
  */
 

-#define        fldoff(str, fld)        ((int)&(((struct str *)0)->fld))
-#define        fldsiz(str, fld)        (sizeof(((struct str *)0)->fld))
-#define        strbase(str, ptr, fld)  ((struct str *)((char *)(ptr)-fldoff(str, fld)))
+#ifndef _STRUCT_H_
+#define        _STRUCT_H_
+
+/* Offset of the field in the structure. */
+#define        fldoff(name, field) \
+       ((int)&(((struct name *)0)->field))
+
+/* Size of the field in the structure. */
+#define        fldsiz(name, field) \
+       (sizeof(((struct name *)0)->field))
+
+/* Address of the structure from a field. */
+#define        strbase(name, addr, field) \
+       ((struct name *)((char *)(addr) - fldoff(name, field)))
+
+#endif /* !_STRUCT_H_ */