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/*
ldb database library
Copyright (C) Andrew Tridgell 2004
** NOTE! The following LGPL license applies to the ldb
** library. This does NOT imply that all of Samba is released
** under the LGPL
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Name: ldb
*
* Component: ldb alloc
*
* Description: functions for memory allocation
*
* Author: Andrew Tridgell
*/
#include "includes.h"
/*
this allows the user to choose their own allocation function
*/
int ldb_set_alloc(struct ldb_context *ldb,
void *(*alloc)(void *context, void *ptr, size_t size),
void *context)
{
ldb->alloc_ops.alloc = alloc;
ldb->alloc_ops.context = context;
return 0;
}
/*
this is the default memory allocation function
*/
static void *ldb_default_alloc(void *context, void *ptr, size_t size)
{
/* by setting LDB_ALLOC_OFS to non-zero the test suite can
catch any places where we incorrectly use the libc alloc
funcitons directly */
#define LDB_ALLOC_OFS 4
/* we don't assume a modern realloc function */
if (ptr == NULL) {
ptr = malloc(size+LDB_ALLOC_OFS);
if (ptr) return ((char *)ptr)+LDB_ALLOC_OFS;
return NULL;
}
if (size == 0) {
free(((char *)ptr)-LDB_ALLOC_OFS);
return NULL;
}
ptr = realloc(((char *)ptr)-LDB_ALLOC_OFS, size+LDB_ALLOC_OFS);
if (ptr) {
return ((char *)ptr)+LDB_ALLOC_OFS;
}
return NULL;
}
/*
all memory allocation goes via this function
*/
void *ldb_realloc(struct ldb_context *ldb, void *ptr, size_t size)
{
if (!ldb->alloc_ops.alloc) {
ldb_set_alloc(ldb, ldb_default_alloc, NULL);
}
return ldb->alloc_ops.alloc(ldb->alloc_ops.context, ptr, size);
}
void *ldb_malloc(struct ldb_context *ldb, size_t size)
{
return ldb_realloc(ldb, NULL, size);
}
void ldb_free(struct ldb_context *ldb, void *ptr)
{
if (ptr != NULL) {
ldb_realloc(ldb, ptr, 0);
}
}
void *ldb_strndup(struct ldb_context *ldb, const char *str, size_t maxlen)
{
size_t len = strnlen(str, maxlen);
void *ret;
ret = ldb_realloc(ldb, NULL, len+1);
if (ret) {
memcpy(ret, str, len);
((char *)ret)[len] = 0;
}
return ret;
}
void *ldb_strdup(struct ldb_context *ldb, const char *str)
{
size_t len = strlen(str);
void *ret;
ret = ldb_realloc(ldb, NULL, len+1);
if (ret) {
memcpy(ret, str, len+1);
}
return ret;
}
/*
a ldb wrapper for asprintf(), using ldb_malloc()
*/
int ldb_asprintf(struct ldb_context *ldb, char **strp, const char *fmt, ...) _PRINTF_ATTRIBUTE(3, 4)
{
int len, len2;
va_list ap;
*strp = NULL;
va_start(ap, fmt);
len = vsnprintf(NULL, 0, fmt, ap);
va_end(ap);
if (len < 0) {
return len;
}
*strp = ldb_malloc(ldb, len+1);
if (! *strp) {
return -1;
}
va_start(ap, fmt);
len2 = vsnprintf(*strp, len+1, fmt, ap);
va_end(ap);
if (len2 != len) {
/* buggy (or non-C99) vsnprintf function */
ldb_free(ldb, *strp);
return -1;
}
return len;
}
/*
realloc an array, checking for integer overflow in the array size
*/
void *ldb_realloc_array(struct ldb_context *ldb,
void *ptr, size_t el_size, unsigned count)
{
#define MAX_MALLOC_SIZE 0x7fffffff
if (count == 0 ||
count >= MAX_MALLOC_SIZE/el_size) {
return NULL;
}
if (!ptr) {
return ldb_malloc(ldb, el_size * count);
}
return ldb_realloc(ldb, ptr, el_size * count);
}
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