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 /* 25 * nd_free_all() is intended to be used after a packet printing 26 */ 27 28 /* Add a memory chunk in allocation linked list */ 29 void 30 nd_add_alloc_list(netdissect_options *ndo, nd_mem_chunk_t *chunkp) 31 { 32 if (ndo->ndo_last_mem_p == NULL) /* first memory allocation */ 33 chunkp->prev_mem_p = NULL; 34 else /* previous memory allocation */ 35 chunkp->prev_mem_p = ndo->ndo_last_mem_p; 36 ndo->ndo_last_mem_p = chunkp; 37 } 38 39 /* malloc replacement, with tracking in a linked list */ 40 void * 41 nd_malloc(netdissect_options *ndo, size_t size) 42 { 43 nd_mem_chunk_t *chunkp = malloc(sizeof(nd_mem_chunk_t) + size); 44 if (chunkp == NULL) 45 return NULL; 46 nd_add_alloc_list(ndo, chunkp); 47 return chunkp + 1; 48 } 49 50 /* Free chunks in allocation linked list from last to first */ 51 void 52 nd_free_all(netdissect_options *ndo) 53 { 54 nd_mem_chunk_t *current, *previous; 55 current = ndo->ndo_last_mem_p; 56 while (current != NULL) { 57 previous = current->prev_mem_p; 58 free(current); 59 current = previous; 60 } 61 ndo->ndo_last_mem_p = NULL; 62 } 63