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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the COPYING file, which can be found at the root of the source code *
* distribution tree, or in https://www.hdfgroup.org/licenses. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*-------------------------------------------------------------------------
*
* Created: H5MM.c
*
* Purpose: Memory management functions
*
*-------------------------------------------------------------------------
*/
/****************/
/* Module Setup */
/****************/
/***********/
/* Headers */
/***********/
#include "H5private.h" /* Generic Functions */
#include "H5Eprivate.h" /* Error handling */
#include "H5MMprivate.h" /* Memory management */
/****************/
/* Local Macros */
/****************/
/******************/
/* Local Typedefs */
/******************/
/********************/
/* Local Prototypes */
/********************/
/*********************/
/* Package Variables */
/*********************/
/*****************************/
/* Library Private Variables */
/*****************************/
/*******************/
/* Local Variables */
/*******************/
/*-------------------------------------------------------------------------
* Function: H5MM_malloc
*
* Purpose: Similar to the C89 version of malloc().
*
* On size of 0, we return a NULL pointer instead of the
* standard-allowed 'special' pointer since that's more
* difficult to check as a return value. This is still
* considered an error condition since allocations of zero
* bytes usually indicate problems.
*
* Return: Success: Pointer to new memory
* Failure: NULL
*-------------------------------------------------------------------------
*/
void *
H5MM_malloc(size_t size)
{
void *ret_value = NULL;
/* Use FUNC_ENTER_NOAPI_NOINIT_NOERR here to avoid performance issues */
FUNC_ENTER_NOAPI_NOINIT_NOERR
ret_value = malloc(size);
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5MM_malloc() */
/*-------------------------------------------------------------------------
* Function: H5MM_calloc
*
* Purpose: Similar to the C89 version of calloc(), except this
* routine just takes a 'size' parameter.
*
* On size of 0, we return a NULL pointer instead of the
* standard-allowed 'special' pointer since that's more
* difficult to check as a return value. This is still
* considered an error condition since allocations of zero
* bytes usually indicate problems.
*
* Return: Success: Pointer to new memory
* Failure: NULL
*-------------------------------------------------------------------------
*/
void *
H5MM_calloc(size_t size)
{
void *ret_value = NULL;
/* Use FUNC_ENTER_NOAPI_NOINIT_NOERR here to avoid performance issues */
FUNC_ENTER_NOAPI_NOINIT_NOERR
ret_value = calloc(1, size);
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5MM_calloc() */
/*-------------------------------------------------------------------------
* Function: H5MM_realloc
*
* Purpose: Similar semantics as C89's realloc(). Specifically, the
* following calls are equivalent:
*
* H5MM_realloc(NULL, size) <==> H5MM_malloc(size)
* H5MM_realloc(ptr, 0) <==> H5MM_xfree(ptr)
* H5MM_realloc(NULL, 0) <==> NULL
*
* Note that the (NULL, 0) combination is undefined behavior
* in the C standard.
*
* Return: Success: Ptr to new memory if size > 0
* NULL if size is zero
* Failure: NULL (input buffer is unchanged on failure)
*-------------------------------------------------------------------------
*/
void *
H5MM_realloc(void *mem, size_t size)
{
void *ret_value = NULL;
/* Use FUNC_ENTER_NOAPI_NOINIT_NOERR here to avoid performance issues */
FUNC_ENTER_NOAPI_NOINIT_NOERR
if (NULL == mem && 0 == size)
/* Not defined in the standard, return NULL */
ret_value = NULL;
else {
ret_value = realloc(mem, size);
/* Some platforms do not return NULL if size is zero. */
if (0 == size)
ret_value = NULL;
}
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5MM_realloc() */
/*-------------------------------------------------------------------------
* Function: H5MM_xstrdup
*
* Purpose: Duplicates a string, including memory allocation.
* NULL is an acceptable value for the input string.
*
* Return: Success: Pointer to a new string (NULL if s is NULL).
* Failure: NULL
*-------------------------------------------------------------------------
*/
char *
H5MM_xstrdup(const char *s)
{
char *ret_value = NULL;
FUNC_ENTER_NOAPI(NULL)
if (s)
if (NULL == (ret_value = HDstrdup(s)))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "string duplication failed");
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5MM_xstrdup() */
/*-------------------------------------------------------------------------
* Function: H5MM_strdup
*
* Purpose: Duplicates a string, including memory allocation.
* NULL is NOT an acceptable value for the input string.
*
* If the string to be duplicated is the NULL pointer, then
* an error will be raised.
*
* Return: Success: Pointer to a new string
* Failure: NULL
*-------------------------------------------------------------------------
*/
char *
H5MM_strdup(const char *s)
{
char *ret_value = NULL;
FUNC_ENTER_NOAPI(NULL)
if (!s)
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "NULL string not allowed");
if (NULL == (ret_value = HDstrdup(s)))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "string duplication failed");
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5MM_strdup() */
/*-------------------------------------------------------------------------
* Function: H5MM_strndup
*
* Purpose: Duplicates a string, including memory allocation, but only
* copies at most `n` bytes from the string to be duplicated.
* If the string to be duplicated is longer than `n`, only `n`
* bytes are copied and a terminating null byte is added.
* NULL is NOT an acceptable value for the input string.
*
* If the string to be duplicated is the NULL pointer, then
* an error will be raised.
*
* Return: Success: Pointer to a new string
* Failure: NULL
*-------------------------------------------------------------------------
*/
char *
H5MM_strndup(const char *s, size_t n)
{
char *ret_value = NULL;
FUNC_ENTER_NOAPI(NULL)
if (!s)
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "NULL string not allowed");
if (NULL == (ret_value = HDstrndup(s, n)))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "string duplication failed");
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5MM_strndup() */
/*-------------------------------------------------------------------------
* Function: H5MM_xfree
*
* Purpose: Just like free(3) except the return value (always NULL) can
* be assigned to the pointer whose memory was just freed:
*
* thing = H5MM_xfree(thing);
*
* Return: Success: NULL
* Failure: never fails
*-------------------------------------------------------------------------
*/
void *
H5MM_xfree(void *mem)
{
/* Use FUNC_ENTER_NOAPI_NOINIT_NOERR here to avoid performance issues */
FUNC_ENTER_NOAPI_NOINIT_NOERR
free(mem);
FUNC_LEAVE_NOAPI(NULL)
} /* end H5MM_xfree() */
/*-------------------------------------------------------------------------
* Function: H5MM_xfree_const
*
* Purpose: H5MM_xfree() wrapper that handles const pointers without
* warnings. Used for freeing buffers that should be regarded
* as const in use but need to be freed when no longer needed.
*
* Return: Success: NULL
* Failure: never fails
*-------------------------------------------------------------------------
*/
void *
H5MM_xfree_const(const void *mem)
{
/* Use FUNC_ENTER_NOAPI_NOINIT_NOERR here to avoid performance issues */
FUNC_ENTER_NOAPI_NOINIT_NOERR
/* Cast through uintptr_t to de-const memory */
H5MM_xfree((void *)(uintptr_t)mem);
FUNC_LEAVE_NOAPI(NULL)
} /* end H5MM_xfree_const() */
/*-------------------------------------------------------------------------
* Function: H5MM_memcpy
*
* Purpose: Like memcpy(3) but with sanity checks on the parameters,
* particularly buffer overlap.
*
* Return: Success: pointer to dest
* Failure: NULL
*-------------------------------------------------------------------------
*/
void *
H5MM_memcpy(void *dest, const void *src, size_t n)
{
void *ret = NULL;
/* Use FUNC_ENTER_NOAPI_NOINIT_NOERR here to avoid performance issues */
FUNC_ENTER_NOAPI_NOINIT_NOERR
assert(dest);
assert(src);
/* Check for buffer overlap */
assert((char *)dest >= (const char *)src + n || (const char *)src >= (char *)dest + n);
/* Copy */
ret = memcpy(dest, src, n);
FUNC_LEAVE_NOAPI(ret)
} /* end H5MM_memcpy() */
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