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