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/* libguestfs
* Copyright (C) 2009-2012 Red Hat Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "c-ctype.h"
#include "hash.h"
#include "hash-pjw.h"
#include "guestfs.h"
#include "guestfs-internal.h"
/* Note the private data area is allocated lazily, since the vast
* majority of callers will never use it. This means g->pda is
* likely to be NULL.
*/
struct pda_entry {
char *key; /* key */
void *data; /* opaque user data pointer */
};
static size_t
hasher (void const *x, size_t table_size)
{
struct pda_entry const *p = x;
return hash_pjw (p->key, table_size);
}
static bool
comparator (void const *x, void const *y)
{
struct pda_entry const *a = x;
struct pda_entry const *b = y;
return STREQ (a->key, b->key);
}
static void
freer (void *x)
{
if (x) {
struct pda_entry *p = x;
free (p->key);
free (p);
}
}
void
guestfs_set_private (guestfs_h *g, const char *key, void *data)
{
if (g->pda == NULL) {
g->pda = hash_initialize (16, NULL, hasher, comparator, freer);
if (g->pda == NULL)
g->abort_cb ();
}
struct pda_entry *new_entry = safe_malloc (g, sizeof *new_entry);
new_entry->key = safe_strdup (g, key);
new_entry->data = data;
struct pda_entry *old_entry = hash_delete (g->pda, new_entry);
freer (old_entry);
struct pda_entry *entry = hash_insert (g->pda, new_entry);
if (entry == NULL)
g->abort_cb ();
assert (entry == new_entry);
}
static inline char *
bad_cast (char const *s)
{
return (char *) s;
}
void *
guestfs_get_private (guestfs_h *g, const char *key)
{
if (g->pda == NULL)
return NULL; /* no keys have been set */
const struct pda_entry k = { .key = bad_cast (key) };
struct pda_entry *entry = hash_lookup (g->pda, &k);
if (entry)
return entry->data;
else
return NULL;
}
/* Iterator. */
void *
guestfs_first_private (guestfs_h *g, const char **key_rtn)
{
if (g->pda == NULL)
return NULL;
g->pda_next = hash_get_first (g->pda);
/* Ignore any keys with NULL data pointers. */
while (g->pda_next && g->pda_next->data == NULL)
g->pda_next = hash_get_next (g->pda, g->pda_next);
if (g->pda_next == NULL)
return NULL;
*key_rtn = g->pda_next->key;
return g->pda_next->data;
}
void *
guestfs_next_private (guestfs_h *g, const char **key_rtn)
{
if (g->pda == NULL)
return NULL;
if (g->pda_next == NULL)
return NULL;
/* Walk to the next key with a non-NULL data pointer. */
do {
g->pda_next = hash_get_next (g->pda, g->pda_next);
} while (g->pda_next && g->pda_next->data == NULL);
if (g->pda_next == NULL)
return NULL;
*key_rtn = g->pda_next->key;
return g->pda_next->data;
}
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