1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
/*
* File: chain.c
* Concomitant control chain (CCC)
* Theory and code by Jorge Arellano Cid
*
* Copyright 2001-2007 Jorge Arellano Cid <jcid@dillo.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*/
#include "msg.h"
#include "chain.h"
#include "../dlib/dlib.h"
#define VERBOSE 0
/*
* Show debugging info
*/
#if VERBOSE
static void Chain_debug_msg(char *FuncStr, int Op, int Branch, int Dir,
ChainLink *Info)
{
const char *StrOps[] = {"", "OpStart", "OpSend",
"OpStop", "OpEnd", "OpAbort"};
MSG("%-*s: %-*s [%d%s] Info=%p Flags=%d\n",
12, FuncStr, 7, StrOps[Op], Branch, (Dir == 1) ? "F" : "B",
Info, Info ? Info->Flags : -1);
}
#else
static void Chain_debug_msg() { }
#endif
/*
* Create and initialize a new chain-link
*/
ChainLink *a_Chain_new(void)
{
return dNew0(ChainLink, 1);
}
/*
* Create a new link from module A to module B.
* 'Direction' tells whether to make a forward or backward link.
* => The link from 'A' to 'B' has 'Direction' direction.
* => The main flow of information names the FWD direction.
* => AtoB_branch: branch on which 'B' receives communications from 'A'
* => BtoA_branch: branch on which 'A' receives communications from 'B'
*/
ChainLink *a_Chain_link_new(ChainLink *AInfo, ChainFunction_t AFunc,
int Direction, ChainFunction_t BFunc,
int AtoB_branch, int BtoA_branch)
{
ChainLink *NewLink = a_Chain_new();
ChainLink *OldLink = AInfo;
if (Direction == BCK) {
NewLink->Fcb = AFunc;
NewLink->FcbInfo = AInfo;
NewLink->FcbBranch = BtoA_branch;
OldLink->Bcb = BFunc;
OldLink->BcbInfo = NewLink;
OldLink->BcbBranch = AtoB_branch;
} else { /* FWD */
NewLink->Bcb = AFunc;
NewLink->BcbInfo = AInfo;
NewLink->BcbBranch = BtoA_branch;
OldLink->Fcb = BFunc;
OldLink->FcbInfo = NewLink;
OldLink->FcbBranch = AtoB_branch;
}
return NewLink;
}
/*
* Unlink a previously used link.
* 'Direction' tells whether to unlink the forward or backward link.
*/
void a_Chain_unlink(ChainLink *Info, int Direction)
{
if (Direction == FWD) {
Info->Fcb = NULL;
Info->FcbInfo = NULL;
Info->FcbBranch = 0;
} else { /* BCK */
Info->Bcb = NULL;
Info->BcbInfo = NULL;
Info->BcbBranch = 0;
}
}
/*
* Issue the forward callback of the 'Info' link
* Return value: 1 if OK, 0 if not operative.
*/
int a_Chain_fcb(int Op, ChainLink *Info, void *Data1, void *Data2)
{
int ret = 0;
if (Info->Flags & (CCC_Ended + CCC_Aborted)) {
/* CCC is not operative */
} else if (Info->Fcb) {
if (Op == OpEnd)
Info->Flags |= CCC_Ended;
else if (Op == OpAbort)
Info->Flags |= CCC_Aborted;
Info->Fcb(Op, Info->FcbBranch, FWD, Info->FcbInfo, Data1, Data2);
ret = 1;
}
return ret;
}
/*
* Issue the backward callback of the 'Info' link
* Return value: 1 if OK, 0 if not operative.
*/
int a_Chain_bcb(int Op, ChainLink *Info, void *Data1, void *Data2)
{
int ret = 0;
if (Info->Flags & (CCC_Ended + CCC_Aborted)) {
/* CCC is not operative */
} else if (Info->Bcb) {
if (Op == OpEnd)
Info->Flags |= CCC_Ended;
else if (Op == OpAbort)
Info->Flags |= CCC_Aborted;
Info->Bcb(Op, Info->BcbBranch, BCK, Info->BcbInfo, Data1, Data2);
ret = 1;
}
return ret;
}
/*
* Allocate and initialize a new DataBuf structure
*/
DataBuf *a_Chain_dbuf_new(void *buf, int size, int code)
{
DataBuf *dbuf = dNew(DataBuf, 1);
dbuf->Buf = buf;
dbuf->Size = size;
dbuf->Code = code;
return dbuf;
}
/*
* Check whether the CCC is operative.
* Also used to hook debug information.
*
* Return value: 1 if ready to use, 0 if not operative.
*/
int a_Chain_check(char *FuncStr, int Op, int Branch, int Dir,
ChainLink *Info)
{
int ret = 0;
/* Show status information */
Chain_debug_msg(FuncStr, Op, Branch, Dir, Info);
if (Info->Flags & (CCC_Ended + CCC_Aborted)) {
/* CCC is not operative */
MSG_WARN("CCC: call on already finished chain.\n");
} else {
ret = 1;
}
return ret;
}
|
