112 lines
4.3 KiB
C
112 lines
4.3 KiB
C
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/* GLIB - Library of useful routines for C programming
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Modified by the GLib Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GLib Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GLib at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#ifndef __G_MEM_H__
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#define __G_MEM_H__
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#include <limits.h>
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#include "gmacros.h"
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#define G_MAXSIZE ULONG_MAX
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/* Optimise: avoid the call to the (slower) _n function if we can
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* determine at compile-time that no overflow happens.
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*/
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#if defined (__GNUC__) && (__GNUC__ >= 2) && defined (__OPTIMIZE__)
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# define _G_NEW(struct_type, n_structs, func) \
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(struct_type *) (G_GNUC_EXTENSION ({ \
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gsize __n = (gsize) (n_structs); \
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gsize __s = sizeof (struct_type); \
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gpointer __p; \
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if (__s == 1) \
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__p = g_##func (__n); \
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else if (__builtin_constant_p (__n) && \
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(__s == 0 || __n <= G_MAXSIZE / __s)) \
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__p = g_##func (__n * __s); \
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else \
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__p = g_##func##_n (__n, __s); \
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__p; \
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}))
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# define _G_RENEW(struct_type, mem, n_structs, func) \
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(struct_type *) (G_GNUC_EXTENSION ({ \
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gsize __n = (gsize) (n_structs); \
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gsize __s = sizeof (struct_type); \
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gpointer __p = (gpointer) (mem); \
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if (__s == 1) \
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__p = g_##func (__p, __n); \
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else if (__builtin_constant_p (__n) && \
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(__s == 0 || __n <= G_MAXSIZE / __s)) \
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__p = g_##func (__p, __n * __s); \
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else \
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__p = g_##func##_n (__p, __n, __s); \
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__p; \
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}))
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#else
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/* Unoptimised version: always call the _n() function. */
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#define _G_NEW(struct_type, n_structs, func) \
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((struct_type *) g_##func##_n ((n_structs), sizeof (struct_type)))
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#define _G_RENEW(struct_type, mem, n_structs, func) \
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((struct_type *) g_##func##_n (mem, (n_structs), sizeof (struct_type)))
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#endif
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gpointer g_try_malloc (gsize n_bytes);
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gpointer g_try_malloc0 (gsize n_bytes);
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gpointer g_try_malloc_n (gsize n_blocks, gsize n_block_bytes);
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gpointer g_malloc0_n (gsize n_blocks, gsize n_block_bytes);
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gpointer g_realloc_n (gpointer mem, gsize n_blocks, gsize n_block_bytes);
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gpointer g_malloc_n (gsize n_blocks, gsize n_block_bytes);
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gpointer g_malloc0 (gsize n_bytes);
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gpointer g_malloc (gsize n_bytes);
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void g_free (gpointer mem);
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/**
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* g_try_new:
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* @struct_type: the type of the elements to allocate
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* @n_structs: the number of elements to allocate
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*
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* Attempts to allocate @n_structs elements of type @struct_type, and returns
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* %NULL on failure. Contrast with g_new(), which aborts the program on failure.
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* The returned pointer is cast to a pointer to the given type.
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* The function returns %NULL when @n_structs is 0 of if an overflow occurs.
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*
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* Since: 2.8
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* Returns: a pointer to the allocated memory, cast to a pointer to @struct_type
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*/
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#define g_try_new(struct_type, n_structs) _G_NEW (struct_type, n_structs, try_malloc)
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#define g_new0(struct_type, n_structs) _G_NEW (struct_type, n_structs, malloc0)
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#define g_new(struct_type, n_structs) _G_NEW (struct_type, n_structs, malloc)
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#define g_renew(struct_type, mem, n_structs) _G_RENEW (struct_type, mem, n_structs, realloc)
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#endif /* __G_MEM_H__ */
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