112 lines
4.3 KiB
C
112 lines
4.3 KiB
C
/* GLIB - Library of useful routines for C programming
|
|
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
|
|
*
|
|
* 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 2.1 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, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/*
|
|
* Modified by the GLib Team and others 1997-2000. See the AUTHORS
|
|
* file for a list of people on the GLib Team. See the ChangeLog
|
|
* files for a list of changes. These files are distributed with
|
|
* GLib at ftp://ftp.gtk.org/pub/gtk/.
|
|
*/
|
|
|
|
#ifndef __G_MEM_H__
|
|
#define __G_MEM_H__
|
|
|
|
#include <limits.h>
|
|
#include "gmacros.h"
|
|
|
|
#define G_MAXSIZE ULONG_MAX
|
|
|
|
/* Optimise: avoid the call to the (slower) _n function if we can
|
|
* determine at compile-time that no overflow happens.
|
|
*/
|
|
#if defined (__GNUC__) && (__GNUC__ >= 2) && defined (__OPTIMIZE__)
|
|
# define _G_NEW(struct_type, n_structs, func) \
|
|
(struct_type *) (G_GNUC_EXTENSION ({ \
|
|
gsize __n = (gsize) (n_structs); \
|
|
gsize __s = sizeof (struct_type); \
|
|
gpointer __p; \
|
|
if (__s == 1) \
|
|
__p = g_##func (__n); \
|
|
else if (__builtin_constant_p (__n) && \
|
|
(__s == 0 || __n <= G_MAXSIZE / __s)) \
|
|
__p = g_##func (__n * __s); \
|
|
else \
|
|
__p = g_##func##_n (__n, __s); \
|
|
__p; \
|
|
}))
|
|
# define _G_RENEW(struct_type, mem, n_structs, func) \
|
|
(struct_type *) (G_GNUC_EXTENSION ({ \
|
|
gsize __n = (gsize) (n_structs); \
|
|
gsize __s = sizeof (struct_type); \
|
|
gpointer __p = (gpointer) (mem); \
|
|
if (__s == 1) \
|
|
__p = g_##func (__p, __n); \
|
|
else if (__builtin_constant_p (__n) && \
|
|
(__s == 0 || __n <= G_MAXSIZE / __s)) \
|
|
__p = g_##func (__p, __n * __s); \
|
|
else \
|
|
__p = g_##func##_n (__p, __n, __s); \
|
|
__p; \
|
|
}))
|
|
|
|
#else
|
|
/* Unoptimised version: always call the _n() function. */
|
|
#define _G_NEW(struct_type, n_structs, func) \
|
|
((struct_type *) g_##func##_n ((n_structs), sizeof (struct_type)))
|
|
#define _G_RENEW(struct_type, mem, n_structs, func) \
|
|
((struct_type *) g_##func##_n (mem, (n_structs), sizeof (struct_type)))
|
|
|
|
#endif
|
|
|
|
gpointer g_try_malloc (gsize n_bytes);
|
|
|
|
gpointer g_try_malloc0 (gsize n_bytes);
|
|
|
|
gpointer g_try_malloc_n (gsize n_blocks, gsize n_block_bytes);
|
|
|
|
gpointer g_malloc0_n (gsize n_blocks, gsize n_block_bytes);
|
|
|
|
gpointer g_realloc_n (gpointer mem, gsize n_blocks, gsize n_block_bytes);
|
|
|
|
gpointer g_malloc_n (gsize n_blocks, gsize n_block_bytes);
|
|
|
|
gpointer g_malloc0 (gsize n_bytes);
|
|
|
|
gpointer g_malloc (gsize n_bytes);
|
|
|
|
void g_free (gpointer mem);
|
|
|
|
/**
|
|
* g_try_new:
|
|
* @struct_type: the type of the elements to allocate
|
|
* @n_structs: the number of elements to allocate
|
|
*
|
|
* Attempts to allocate @n_structs elements of type @struct_type, and returns
|
|
* %NULL on failure. Contrast with g_new(), which aborts the program on failure.
|
|
* The returned pointer is cast to a pointer to the given type.
|
|
* The function returns %NULL when @n_structs is 0 of if an overflow occurs.
|
|
*
|
|
* Since: 2.8
|
|
* Returns: a pointer to the allocated memory, cast to a pointer to @struct_type
|
|
*/
|
|
#define g_try_new(struct_type, n_structs) _G_NEW (struct_type, n_structs, try_malloc)
|
|
#define g_new0(struct_type, n_structs) _G_NEW (struct_type, n_structs, malloc0)
|
|
#define g_new(struct_type, n_structs) _G_NEW (struct_type, n_structs, malloc)
|
|
#define g_renew(struct_type, mem, n_structs) _G_RENEW (struct_type, mem, n_structs, realloc)
|
|
|
|
#endif /* __G_MEM_H__ */
|