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/* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#include "mysys_priv.h"
#include "mysys_err.h"
#include <m_string.h>
/**
Allocate a sized block of memory.
@param size The size of the memory block in bytes.
@param flags Failure action modifiers (bitmasks).
@return A pointer to the allocated memory block, or NULL on failure.
*/
void *my_malloc(size_t size, myf my_flags)
{
void* point;
DBUG_ENTER("my_malloc");
DBUG_PRINT("my",("size: %lu my_flags: %d", (ulong) size, my_flags));
/* Safety */
if (!size)
size=1;
point= malloc(size);
DBUG_EXECUTE_IF("simulate_out_of_memory",
{
free(point);
point= NULL;
});
DBUG_EXECUTE_IF("simulate_persistent_out_of_memory",
{
free(point);
point= NULL;
});
if (point == NULL)
{
my_errno=errno;
if (my_flags & MY_FAE)
error_handler_hook=fatal_error_handler_hook;
if (my_flags & (MY_FAE+MY_WME))
my_error(EE_OUTOFMEMORY, MYF(ME_BELL + ME_WAITTANG +
ME_NOREFRESH + ME_FATALERROR),size);
DBUG_EXECUTE_IF("simulate_out_of_memory",
DBUG_SET("-d,simulate_out_of_memory"););
if (my_flags & MY_FAE)
exit(1);
}
else if (my_flags & MY_ZEROFILL)
bzero(point, size);
DBUG_PRINT("exit",("ptr: %p", point));
DBUG_RETURN(point);
}
/**
@brief wrapper around realloc()
@param oldpoint pointer to currently allocated area
@param size new size requested, must be >0
@param my_flags flags
@note if size==0 realloc() may return NULL; my_realloc() treats this as an
error which is not the intention of realloc()
*/
void *my_realloc(void *oldpoint, size_t size, myf my_flags)
{
void *point;
DBUG_ENTER("my_realloc");
DBUG_PRINT("my",("ptr: %p size: %lu my_flags: %d", oldpoint,
(ulong) size, my_flags));
DBUG_ASSERT(size > 0);
if (!oldpoint && (my_flags & MY_ALLOW_ZERO_PTR))
DBUG_RETURN(my_malloc(size, my_flags));
#ifdef USE_HALLOC
if (!(point = malloc(size)))
{
if (my_flags & MY_FREE_ON_ERROR)
my_free(oldpoint);
if (my_flags & MY_HOLD_ON_ERROR)
DBUG_RETURN(oldpoint);
my_errno=errno;
if (my_flags & MY_FAE+MY_WME)
my_error(EE_OUTOFMEMORY, MYF(ME_BELL + ME_WAITTANG + ME_FATALERROR),size);
}
else
{
memcpy(point,oldpoint,size);
free(oldpoint);
}
#else
if ((point= realloc(oldpoint, size)) == NULL)
{
if (my_flags & MY_FREE_ON_ERROR)
my_free(oldpoint);
if (my_flags & MY_HOLD_ON_ERROR)
DBUG_RETURN(oldpoint);
my_errno=errno;
if (my_flags & (MY_FAE+MY_WME))
my_error(EE_OUTOFMEMORY, MYF(ME_BELL + ME_WAITTANG + ME_FATALERROR), size);
}
#endif
DBUG_PRINT("exit",("ptr: %p", point));
DBUG_RETURN(point);
}
/**
Free memory allocated with my_malloc.
@remark Relies on free being able to handle a NULL argument.
@param ptr Pointer to the memory allocated by my_malloc.
*/
void my_free(void *ptr)
{
DBUG_ENTER("my_free");
DBUG_PRINT("my",("ptr: %p", ptr));
free(ptr);
DBUG_VOID_RETURN;
}
void *my_memdup(const void *from, size_t length, myf my_flags)
{
void *ptr;
if ((ptr= my_malloc(length,my_flags)) != 0)
memcpy(ptr, from, length);
return ptr;
}
char *my_strdup(const char *from, myf my_flags)
{
char *ptr;
size_t length= strlen(from)+1;
if ((ptr= (char*) my_malloc(length, my_flags)))
memcpy(ptr, from, length);
return ptr;
}
char *my_strndup(const char *from, size_t length, myf my_flags)
{
char *ptr;
if ((ptr= (char*) my_malloc(length+1, my_flags)))
{
memcpy(ptr, from, length);
ptr[length]= 0;
}
return ptr;
}
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