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Add NULL-safe lookup function

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New lh_table_lookup_ex() method protects itself against null pointers
and invalid objects being passed in.
This commit is contained in:
Keith Derrick
2012-04-12 11:43:34 -07:00
parent 74d830dc03
commit 4a2cd966f5
2 changed files with 26 additions and 3 deletions
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17
linkhash.c
View File

@@ -3,6 +3,7 @@
*
* Copyright (c) 2004, 2005 Metaparadigm Pte. Ltd.
* Michael Clark <michael@metaparadigm.com>
* Copyright (c) 2009 Hewlett-Packard Development Company, L.P.
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See COPYING for details.
@@ -174,11 +175,21 @@ struct lh_entry* lh_table_lookup_entry(struct lh_table *t, const void *k)
const void* lh_table_lookup(struct lh_table *t, const void *k)
{
struct lh_entry *e = lh_table_lookup_entry(t, k);
if(e) return e->v;
return NULL;
void *result;
lh_table_lookup_ex(t, k, &result);
return result;
}
json_bool lh_table_lookup_ex(struct lh_table* t, const void* k, void **v)
{
struct lh_entry *e = lh_table_lookup_entry(t, k);
if (e != NULL) {
if (v != NULL) *v = (void *)e->v;
return TRUE; /* key found */
}
if (v != NULL) *v = NULL;
return FALSE; /* key not found */
}
int lh_table_delete_entry(struct lh_table *t, struct lh_entry *e)
{

12
linkhash.h
View File

@@ -3,6 +3,7 @@
*
* Copyright (c) 2004, 2005 Metaparadigm Pte. Ltd.
* Michael Clark <michael@metaparadigm.com>
* Copyright (c) 2009 Hewlett-Packard Development Company, L.P.
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See COPYING for details.
@@ -12,6 +13,8 @@
#ifndef _linkhash_h_
#define _linkhash_h_
#include "json_object.h"
#ifdef __cplusplus
extern "C" {
#endif
@@ -241,9 +244,18 @@ extern struct lh_entry* lh_table_lookup_entry(struct lh_table *t, const void *k)
* @param t the table to lookup
* @param k a pointer to the key to lookup
* @return a pointer to the found value or NULL if it does not exist.
* @deprecated Use lh_table_lookup_ex instead.
*/
extern const void* lh_table_lookup(struct lh_table *t, const void *k);
/**
* Lookup a record in the table
* @param t the table to lookup
* @param k a pointer to the key to lookup
* @param v a pointer to a where to store the found value (set to NULL if it doesn't exist).
* @return whether or not the key was found
*/
extern json_bool lh_table_lookup_ex(struct lh_table *t, const void *k, void **v);
/**
* Delete a record from the table.