27b06c6ddb
* include/stddef.h (max_align_t): Add typedef for max_align_t. * lib/stdlib/malloc.c (malloc): Align the blocks it gives out to multiples of max_align_t.
53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2016,2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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* Copyright © 2021 Danny Milosavljevic <dannym@scratchpost.org>
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*
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* This file is part of GNU Mes.
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*
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* GNU Mes is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* GNU Mes is distributed in the hope that it will be useful, but
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* 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 GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <mes/lib.h>
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#include <string.h>
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#include <stddef.h>
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#include <stdint.h>
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/* FIXME: We want bin/mes-mescc's x86-linux sha256sum to stay the same.
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Therfore we cannot remove stdlib/malloc from libc_SOURCES, which is
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what GNU suggests.
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move stdlib/malloc.c to unix/malloc.c and move it from shared
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libc_SOURCES to linux-specific list when the checksum of mes.c
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changes. */
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#if !__GNU__
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char *__brk = 0;
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void *
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malloc (size_t size)
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{
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if (!__brk)
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__brk = (char *) brk (0);
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/* align what we give back. */
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__brk = (char*) (((uintptr_t) __brk
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+ sizeof (max_align_t) - 1) & -sizeof (max_align_t));
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if (brk (__brk + size) == -1)
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return 0;
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char *p = __brk;
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__brk += size;
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return p;
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}
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#endif /* !__GNU__ */
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