ext/ext_utils.h

/* **********************************************************
 * Copyright (c) 2011-2016 Google, Inc.  All rights reserved.
 * **********************************************************/

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/* Shared utilities for Extension implementations */

#ifndef EXT_UTILS_H
#define EXT_UTILS_H

#define BUFFER_SIZE_BYTES(buf) sizeof(buf)
#define BUFFER_SIZE_ELEMENTS(buf) (BUFFER_SIZE_BYTES(buf) / sizeof(buf[0]))
#define BUFFER_LAST_ELEMENT(buf) buf[BUFFER_SIZE_ELEMENTS(buf) - 1]
#define NULL_TERMINATE_BUFFER(buf) BUFFER_LAST_ELEMENT(buf) = 0

/* check if all bits in mask are set in var */
#define TESTALL(mask, var) (((mask) & (var)) == (mask))
/* check if any bit in mask is set in var */
#define TESTANY(mask, var) (((mask) & (var)) != 0)
/* check if a single bit is set in var */
#define TEST TESTANY

#define ALIGNED(x, alignment) ((((ptr_uint_t)x) & ((alignment)-1)) == 0)
#define ALIGN_FORWARD(x, alignment) \
    ((((ptr_uint_t)x) + ((alignment)-1)) & (~((alignment)-1)))
#define ALIGN_BACKWARD(x, alignment) (((ptr_uint_t)x) & (~((ptr_uint_t)(alignment)-1)))

#endif /* EXT_UTILS_H */