1 /*
2 * Copyright (c) 2018 The TCPDUMP project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code
7 * distributions retain the above copyright notice and this paragraph
8 * in its entirety, and (2) distributions including binary code include
9 * the above copyright notice and this paragraph in its entirety in
10 * the documentation or other materials provided with the distribution.
11 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
12 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
13 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
14 * FOR A PARTICULAR PURPOSE.
15 */
16
17 #ifdef HAVE_CONFIG_H
18 #include <config.h>
19 #endif
20
21 #include <stdlib.h>
22 #include "netdissect-alloc.h"
23
24 static void nd_add_alloc_list(netdissect_options *, nd_mem_chunk_t *);
25
26 /*
27 * nd_free_all() is intended to be used after a packet printing
28 */
29
30 /* Add a memory chunk in allocation linked list */
31 static void
nd_add_alloc_list(netdissect_options * ndo,nd_mem_chunk_t * chunkp)32 nd_add_alloc_list(netdissect_options *ndo, nd_mem_chunk_t *chunkp)
33 {
34 if (ndo->ndo_last_mem_p == NULL) /* first memory allocation */
35 chunkp->prev_mem_p = NULL;
36 else /* previous memory allocation */
37 chunkp->prev_mem_p = ndo->ndo_last_mem_p;
38 ndo->ndo_last_mem_p = chunkp;
39 }
40
41 /* malloc replacement, with tracking in a linked list */
42 void *
nd_malloc(netdissect_options * ndo,size_t size)43 nd_malloc(netdissect_options *ndo, size_t size)
44 {
45 nd_mem_chunk_t *chunkp = malloc(sizeof(nd_mem_chunk_t) + size);
46 if (chunkp == NULL)
47 return NULL;
48 nd_add_alloc_list(ndo, chunkp);
49 return chunkp + 1;
50 }
51
52 /* Free chunks in allocation linked list from last to first */
53 void
nd_free_all(netdissect_options * ndo)54 nd_free_all(netdissect_options *ndo)
55 {
56 nd_mem_chunk_t *current, *previous;
57 current = ndo->ndo_last_mem_p;
58 while (current != NULL) {
59 previous = current->prev_mem_p;
60 free(current);
61 current = previous;
62 }
63 ndo->ndo_last_mem_p = NULL;
64 }
65