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/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=8:tabstop=8:
*
* Copyright (C) 2001 Cluster File Systems, Inc. <braam@clusterfs.com>
*
* This file is part of InterMezzo, http://www.inter-mezzo.org.
*
* InterMezzo is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* InterMezzo is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with InterMezzo; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Data structures unpacking/packing macros & inlines
*
*/
#ifndef _INTERMEZZO_LIB_H
#define _INTERMEZZO_LIB_H
#ifdef __KERNEL__
# include <linux/types.h>
#else
# include <string.h>
# include <sys/types.h>
#endif
#undef MIN
#define MIN(a,b) (((a)<(b)) ? (a): (b))
#undef MAX
#define MAX(a,b) (((a)>(b)) ? (a): (b))
#define MKSTR(ptr) ((ptr))? (ptr) : ""
static inline int size_round (int val)
{
return (val + 3) & (~0x3);
}
static inline int size_round0(int val)
{
if (!val)
return 0;
return (val + 1 + 3) & (~0x3);
}
static inline size_t round_strlen(char *fset)
{
return size_round(strlen(fset) + 1);
}
#ifdef __KERNEL__
# define NTOH__u32(var) le32_to_cpu(var)
# define NTOH__u64(var) le64_to_cpu(var)
# define HTON__u32(var) cpu_to_le32(var)
# define HTON__u64(var) cpu_to_le64(var)
#else
# include <glib.h>
# define NTOH__u32(var) GUINT32_FROM_LE(var)
# define NTOH__u64(var) GUINT64_FROM_LE(var)
# define HTON__u32(var) GUINT32_TO_LE(var)
# define HTON__u64(var) GUINT64_TO_LE(var)
#endif
/*
* copy sizeof(type) bytes from pointer to var and move ptr forward.
* return EFAULT if pointer goes beyond end
*/
#define UNLOGV(var,type,ptr,end) \
do { \
var = *(type *)ptr; \
ptr += sizeof(type); \
if (ptr > end ) \
return -EFAULT; \
} while (0)
/* the following two macros convert to little endian */
/* type MUST be __u32 or __u64 */
#define LUNLOGV(var,type,ptr,end) \
do { \
var = NTOH##type(*(type *)ptr); \
ptr += sizeof(type); \
if (ptr > end ) \
return -EFAULT; \
} while (0)
/* now log values */
#define LOGV(var,type,ptr) \
do { \
*((type *)ptr) = var; \
ptr += sizeof(type); \
} while (0)
/* and in network order */
#define LLOGV(var,type,ptr) \
do { \
*((type *)ptr) = HTON##type(var); \
ptr += sizeof(type); \
} while (0)
/*
* set var to point at (type *)ptr, move ptr forward with sizeof(type)
* return from function with EFAULT if ptr goes beyond end
*/
#define UNLOGP(var,type,ptr,end) \
do { \
var = (type *)ptr; \
ptr += sizeof(type); \
if (ptr > end ) \
return -EFAULT; \
} while (0)
#define LOGP(var,type,ptr) \
do { \
memcpy(ptr, var, sizeof(type)); \
ptr += sizeof(type); \
} while (0)
/*
* set var to point at (char *)ptr, move ptr forward by size_round(len);
* return from function with EFAULT if ptr goes beyond end
*/
#define UNLOGL(var,type,len,ptr,end) \
do { \
if (len == 0) \
var = (type *)0; \
else { \
var = (type *)ptr; \
ptr += size_round(len * sizeof(type)); \
} \
if (ptr > end ) \
return -EFAULT; \
} while (0)
#define UNLOGL0(var,type,len,ptr,end) \
do { \
UNLOGL(var,type,len+1,ptr,end); \
if ( *((char *)ptr - size_round(len+1) + len) != '\0') \
return -EFAULT; \
} while (0)
#define LOGL(var,len,ptr) \
do { \
size_t __fill = size_round(len); \
/* Prevent data leakage. */ \
if (__fill > 0) \
memset((char *)ptr, 0, __fill); \
memcpy((char *)ptr, (const char *)var, len); \
ptr += __fill; \
} while (0)
#define LOGL0(var,len,ptr) \
do { \
if (!len) break; \
memcpy((char *)ptr, (const char *)var, len); \
*((char *)(ptr) + len) = 0; \
ptr += size_round(len + 1); \
} while (0)
#endif /* _INTERMEZZO_LIB_H */
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