Cider Isn't Darwin Emulation, Really
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980/*- * Copyright (c) 1983, 1993 * 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 8.1 (Berkeley) 6/2/93 */
#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)))
/* * countof() cannot be safely used in a _Static_assert statement, so we provide * an unsafe variant that does not verify the input array is statically-defined. */#define countof_unsafe(arr) \ (sizeof(arr) / sizeof(arr[0]))
/* Number of elements in a statically-defined array */#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L && __GNUC__#define countof(arr) ({ \ _Static_assert( \ !__builtin_types_compatible_p(typeof(arr), typeof(&(arr)[0])), \ "array must be statically defined"); \ (sizeof(arr) / sizeof(arr[0])); \})#else#define countof(arr) \ countof_unsafe(arr)#endif
/* Length of a statically-defined string (does not include null terminator) */#define lenof(str) \ (sizeof(str) - 1)
/* Last index of a statically-defined array */#define lastof(arr) \ (countof(arr) - 1)
#endif /* !_STRUCT_H_ */