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/* nbdkit
* Copyright Red Hat
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of Red Hat nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <nbdkit-plugin.h>
#include "allocator.h"
#include "allocator-internal.h"
#include "strndup.h"
#include "vector.h"
/* The list of registered allocators. */
DEFINE_VECTOR_TYPE (allocator_list, const struct allocator_functions *);
static allocator_list allocators = empty_vector;
void
register_allocator (const struct allocator_functions *f)
{
if (allocator_list_append (&allocators, f) == -1) {
perror ("realloc");
exit (EXIT_FAILURE);
}
}
static void
free_key_value (struct key_value kv)
{
free (kv.key);
free (kv.value);
}
static void
free_allocator_parameters (allocator_parameters *params)
{
allocator_parameters_iter (params, free_key_value);
free (params->ptr);
}
/* The type may be followed by parameters "type,key=value[,...]" */
static int
parse_parameters (const char *type, size_t *type_len,
allocator_parameters *params)
{
size_t i, j, len;
*type_len = strcspn (type, ",");
nbdkit_debug ("allocator: %*s", (int) *type_len, type);
/* Split the parameters. */
for (i = *type_len; type[i] == ',';) {
struct key_value kv;
i++;
len = strcspn (&type[i], ",");
if (len == 0) {
i++;
continue;
}
j = strcspn (&type[i], "=");
if (j == 0) {
nbdkit_error ("invalid allocator parameter");
free_allocator_parameters (params);
return -1;
}
if (j < len) {
kv.key = strndup (&type[i], j);
kv.value = strndup (&type[i+j+1], len-j-1);
}
else {
kv.key = strndup (&type[i], len);
kv.value = strdup ("1");
}
if (kv.key == NULL || kv.value == NULL) {
nbdkit_error ("strdup: %m");
free (kv.key);
free (kv.value);
free_allocator_parameters (params);
return -1;
}
nbdkit_debug ("allocator parameter: %s=%s", kv.key, kv.value);
if (allocator_parameters_append (params, kv) == -1) {
nbdkit_error ("realloc: %m");
free_allocator_parameters (params);
return -1;
}
i += len;
}
return 0;
}
struct allocator *
create_allocator (const char *type, bool debug)
{
struct allocator *ret = NULL;
allocator_parameters params = empty_vector;
size_t i, type_len;
if (parse_parameters (type, &type_len, ¶ms) == -1)
return NULL;
/* See if we can find the allocator. */
for (i = 0; i < allocators.len; ++i) {
if (strncmp (type, allocators.ptr[i]->type, type_len) == 0) {
ret = allocators.ptr[i]->create (¶ms);
break;
}
}
if (ret == NULL)
nbdkit_error ("unknown allocator \"%s\"", type);
/* Free the parameters allocated above. */
free_allocator_parameters (¶ms);
if (ret) {
ret->debug = debug;
ret->f = allocators.ptr[i];
}
return ret;
}
void
cleanup_free_allocator (struct allocator **ap)
{
struct allocator *a = *ap;
if (a && a->f)
a->f->free (a);
}
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