1/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- 2 * vim:expandtab:shiftwidth=8:tabstop=8: 3 * 4 * Copyright (C) 2001 Cluster File Systems, Inc. <braam@clusterfs.com> 5 * 6 * This file is part of InterMezzo, http://www.inter-mezzo.org. 7 * 8 * InterMezzo is free software; you can redistribute it and/or 9 * modify it under the terms of version 2 of the GNU General Public 10 * License as published by the Free Software Foundation. 11 * 12 * InterMezzo is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with InterMezzo; if not, write to the Free Software 19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 * 21 * Data structures unpacking/packing macros & inlines 22 * 23 */ 24 25#ifndef _INTERMEZZO_LIB_H 26#define _INTERMEZZO_LIB_H 27 28#ifdef __KERNEL__ 29# include <linux/types.h> 30#else 31# include <string.h> 32# include <sys/types.h> 33#endif 34 35#undef MIN 36#define MIN(a,b) (((a)<(b)) ? (a): (b)) 37#undef MAX 38#define MAX(a,b) (((a)>(b)) ? (a): (b)) 39#define MKSTR(ptr) ((ptr))? (ptr) : "" 40 41static inline int size_round (int val) 42{ 43 return (val + 3) & (~0x3); 44} 45 46static inline int size_round0(int val) 47{ 48 if (!val) 49 return 0; 50 return (val + 1 + 3) & (~0x3); 51} 52 53static inline size_t round_strlen(char *fset) 54{ 55 return size_round(strlen(fset) + 1); 56} 57 58#ifdef __KERNEL__ 59# define NTOH__u32(var) le32_to_cpu(var) 60# define NTOH__u64(var) le64_to_cpu(var) 61# define HTON__u32(var) cpu_to_le32(var) 62# define HTON__u64(var) cpu_to_le64(var) 63#else 64# include <glib.h> 65# define NTOH__u32(var) GUINT32_FROM_LE(var) 66# define NTOH__u64(var) GUINT64_FROM_LE(var) 67# define HTON__u32(var) GUINT32_TO_LE(var) 68# define HTON__u64(var) GUINT64_TO_LE(var) 69#endif 70 71/* 72 * copy sizeof(type) bytes from pointer to var and move ptr forward. 73 * return EFAULT if pointer goes beyond end 74 */ 75#define UNLOGV(var,type,ptr,end) \ 76do { \ 77 var = *(type *)ptr; \ 78 ptr += sizeof(type); \ 79 if (ptr > end ) \ 80 return -EFAULT; \ 81} while (0) 82 83/* the following two macros convert to little endian */ 84/* type MUST be __u32 or __u64 */ 85#define LUNLOGV(var,type,ptr,end) \ 86do { \ 87 var = NTOH##type(*(type *)ptr); \ 88 ptr += sizeof(type); \ 89 if (ptr > end ) \ 90 return -EFAULT; \ 91} while (0) 92 93/* now log values */ 94#define LOGV(var,type,ptr) \ 95do { \ 96 *((type *)ptr) = var; \ 97 ptr += sizeof(type); \ 98} while (0) 99 100/* and in network order */ 101#define LLOGV(var,type,ptr) \ 102do { \ 103 *((type *)ptr) = HTON##type(var); \ 104 ptr += sizeof(type); \ 105} while (0) 106 107 108/* 109 * set var to point at (type *)ptr, move ptr forward with sizeof(type) 110 * return from function with EFAULT if ptr goes beyond end 111 */ 112#define UNLOGP(var,type,ptr,end) \ 113do { \ 114 var = (type *)ptr; \ 115 ptr += sizeof(type); \ 116 if (ptr > end ) \ 117 return -EFAULT; \ 118} while (0) 119 120#define LOGP(var,type,ptr) \ 121do { \ 122 memcpy(ptr, var, sizeof(type)); \ 123 ptr += sizeof(type); \ 124} while (0) 125 126/* 127 * set var to point at (char *)ptr, move ptr forward by size_round(len); 128 * return from function with EFAULT if ptr goes beyond end 129 */ 130#define UNLOGL(var,type,len,ptr,end) \ 131do { \ 132 if (len == 0) \ 133 var = (type *)0; \ 134 else { \ 135 var = (type *)ptr; \ 136 ptr += size_round(len * sizeof(type)); \ 137 } \ 138 if (ptr > end ) \ 139 return -EFAULT; \ 140} while (0) 141 142#define UNLOGL0(var,type,len,ptr,end) \ 143do { \ 144 UNLOGL(var,type,len+1,ptr,end); \ 145 if ( *((char *)ptr - size_round(len+1) + len) != '\0') \ 146 return -EFAULT; \ 147} while (0) 148 149#define LOGL(var,len,ptr) \ 150do { \ 151 size_t __fill = size_round(len); \ 152 /* Prevent data leakage. */ \ 153 if (__fill > 0) \ 154 memset((char *)ptr, 0, __fill); \ 155 memcpy((char *)ptr, (const char *)var, len); \ 156 ptr += __fill; \ 157} while (0) 158 159#define LOGL0(var,len,ptr) \ 160do { \ 161 if (!len) break; \ 162 memcpy((char *)ptr, (const char *)var, len); \ 163 *((char *)(ptr) + len) = 0; \ 164 ptr += size_round(len + 1); \ 165} while (0) 166 167#endif /* _INTERMEZZO_LIB_H */ 168 169