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
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
/* linkedlist.c
* This file set implements a generic linked list object. It can be used
* wherever a linke list is required.
*
* NOTE: we do not currently provide a constructor and destructor for the
* object itself as we assume it will always be part of another strucuture.
* Having a pointer to it, I think, does not really make sense but costs
* performance. Consequently, there is is llInit() and llDestroy() and they
* do what a constructor and destructur do, except for creating the
* linkedList_t structure itself.
*
* File begun on 2007-07-31 by RGerhards
*
* Copyright 2007 Rainer Gerhards and Adiscon GmbH.
*
* 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 2
* of the License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* A copy of the GPL can be found in the file "COPYING" in this distribution.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include "rsyslog.h"
#include "linkedlist.h"
/* Initialize an existing linkedList_t structure
* pKey destructor may be zero to take care of non-keyed lists.
*/
rsRetVal llInit(linkedList_t *pThis, rsRetVal (*pEltDestructor)(void*), rsRetVal (*pKeyDestructor)(void*))
{
assert(pThis != NULL);
assert(pEltDestructor != NULL);
pThis->pEltDestruct = pEltDestructor;
pThis->pKeyDestruct = pKeyDestructor;
pThis->cmpOp = NULL;
pThis->pKey = NULL;
pThis->iNumElts = 0;
pThis->pRoot = NULL;
pThis->pLast = NULL;
return RS_RET_OK;
};
/* llDestroy - destroys a COMPLETE linkedList
*/
rsRetVal llDestroy(linkedList_t *pThis)
{
DEFiRet;
llElt_t *pElt;
llElt_t *pEltPrev;
assert(pThis != NULL);
pElt = pThis->pRoot;
while(pElt != NULL) {
pEltPrev = pElt;
pElt = pElt->pNext;
/* we ignore errors during destruction, as we need to try
* finish the linked list in any case.
*/
if(pEltPrev->pData != NULL)
pThis->pEltDestruct(pEltPrev->pData);
if(pEltPrev->pKey != NULL)
pThis->pKeyDestruct(pEltPrev->pKey);
free(pEltPrev);
}
return iRet;
}
/* get next user data element of a linked list. The caller must also
* provide a "cookie" to the function. On initial call, it must be
* NULL. Other than that, the caller is not allowed to to modify the
* cookie. In the current implementation, the cookie is an actual
* pointer to the current list element, but this is nothing that the
* caller should rely on.
*/
rsRetVal llGetNextElt(linkedList_t *pThis, linkedListCookie_t *ppElt, void **ppUsr)
{
llElt_t *pElt;
DEFiRet;
assert(pThis != NULL);
assert(ppElt != NULL);
assert(ppUsr != NULL);
pElt = *ppElt;
pElt = (pElt == NULL) ? pThis->pRoot : pElt->pNext;
if(pElt == NULL) {
iRet = RS_RET_END_OF_LINKEDLIST;
} else {
pElt = pThis->pRoot;
*ppUsr = pElt->pData;
}
*ppElt = pElt;
return iRet;
}
/* construct a new llElt_t
*/
static rsRetVal llEltConstruct(llElt_t **ppThis, void *pKey, void *pData)
{
DEFiRet;
llElt_t *pThis;
assert(ppThis != NULL);
if((pThis = (llElt_t*) calloc(1, sizeof(llElt_t))) == NULL) {
ABORT_FINALIZE(RS_RET_OUT_OF_MEMORY);
}
pThis->pKey = pKey;
pThis->pData = pData;
finalize_it:
*ppThis = pThis;
return iRet;
}
/* append a user element to the end of the linked list. This includes setting a key. If no
* key is desired, simply pass in a NULL pointer for it.
*/
rsRetVal llAppend(linkedList_t *pThis, void *pKey, void *pData)
{
llElt_t *pElt;
DEFiRet;
CHKiRet(llEltConstruct(&pElt, pKey, pData));
pThis->iNumElts++; /* one more */
if(pThis->pLast == NULL) {
pThis->pRoot = pElt;
} else {
pThis->pLast->pNext = pElt;
}
pThis->pLast = pElt;
finalize_it:
return iRet;
}
/* find a user element based on the provided key
*/
rsRetVal llFind(linkedList_t *pThis, void *pKey, void **ppData)
{
DEFiRet;
llElt_t *pElt;
int bFound = 0;
assert(pThis != NULL);
assert(pKey != NULL);
assert(ppData != NULL);
pElt = pThis->pRoot;
while(pElt != NULL && bFound == 0) {
if(pThis->cmpOp(pKey, pElt->pKey) == 0)
bFound = 1;
else
pElt = pElt->pNext;
}
if(bFound == 1) {
*ppData = pElt->pData;
} else {
iRet = RS_RET_NOT_FOUND;
}
return iRet;
}
/*
* vi:set ai:
*/
|
