lib/posix_memalign.c

/* A posix_memalign() function that works around platform bugs.
   Copyright (C) 2020-2026 Free Software Foundation, Inc.

   This file 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 file 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 program.  If not, see <https://www.gnu.org/licenses/>.  */

#include <config.h>

/* Specification.  */
#include <stdlib.h>

#include <errno.h>
#include <stdckdint.h>

int
posix_memalign (void **memptr, size_t alignment, size_t size)
#undef posix_memalign
{
  /* Round SIZE up to the next multiple of ALIGNMENT.
     However, treat a zero size as if it were ALIGNMENT.  */
  size_t aligned_size;
  if (ckd_add (&aligned_size, size, alignment - !!size))
    return ENOMEM;
  aligned_size &= -alignment;
  return posix_memalign (memptr, alignment, aligned_size);
}