BLI: add new 'memory_utils' module with func checking a whole memory chunk is filled of zero,
and an helper to ensure all memory of a given structure passed a given member is filled of zero.
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/*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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#ifndef __BLI_MEMORY_UTILS_H__
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#define __BLI_MEMORY_UTILS_H__
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/** \file BLI_memory_utils.h
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* \ingroup bli
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* \brief Generic memory manipulation API.
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*/
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/* it may be defined already */
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#ifndef __BLI_UTILDEFINES_H__
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bool BLI_memory_is_zero(const void *arr, const size_t size);
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#endif
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#endif /* __BLI_MEMORY_UTILS_H__ */
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@ -513,6 +513,17 @@ extern "C" {
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sizeof(*(struct_var)) - OFFSETOF_STRUCT(struct_var, member)); \
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} (void)0
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/* defined
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* in memory_utils.c for now. I do not know where we should put it actually... */
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#ifndef __BLI_MEMORY_UTILS_H__
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extern bool BLI_memory_is_zero(const void *arr, const size_t arr_size);
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#endif
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#define MEMCMP_STRUCT_OFS_IS_ZERO(struct_var, member) \
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(BLI_memory_is_zero( \
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(char *)(struct_var) + OFFSETOF_STRUCT(struct_var, member), \
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sizeof(*(struct_var)) - OFFSETOF_STRUCT(struct_var, member)))
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/* Warning-free macros for storing ints in pointers. Use these _only_
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* for storing an int in a pointer, not a pointer in an int (64bit)! */
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#define SET_INT_IN_POINTER(i) ((void *)(intptr_t)(i))
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@ -88,6 +88,7 @@ set(SRC
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intern/math_statistics.c
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intern/math_vector.c
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intern/math_vector_inline.c
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intern/memory_utils.c
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intern/noise.c
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intern/path_util.c
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intern/polyfill2d.c
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@ -169,6 +170,7 @@ set(SRC
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BLI_math_statistics.h
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BLI_math_vector.h
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BLI_memarena.h
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BLI_memory_utils.h
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BLI_mempool.h
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BLI_noise.h
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BLI_path_util.h
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@ -0,0 +1,50 @@
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/*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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/** \file blender/blenlib/intern/memory_utils.c
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* \ingroup bli
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* \brief Generic memory manipulation API.
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*
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* This is to extend on existing functions
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* such as ``memcpy`` & ``memcmp``.
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*/
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#include <string.h>
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#include "BLI_sys_types.h"
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#include "BLI_utildefines.h"
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#include "BLI_memory_utils.h"
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#include "BLI_strict_flags.h"
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/**
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* Check if memory is zero'd, as with memset(s, 0, nbytes)
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*/
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bool BLI_memory_is_zero(const void *s, const size_t nbytes)
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{
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const char *s_byte = s;
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const char *s_end = (const char *)s + nbytes;
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while ((s_byte != s_end) && (*s_byte == 0)) {
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s_byte++;
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}
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return (s_byte == s_end);
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}
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