1  /* A posix_memalign() function that works around platform bugs.
       2     Copyright (C) 2020-2023 Free Software Foundation, Inc.
       3  
       4     This file is free software: you can redistribute it and/or modify
       5     it under the terms of the GNU Lesser General Public License as
       6     published by the Free Software Foundation; either version 2.1 of the
       7     License, or (at your option) any later version.
       8  
       9     This file is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12     GNU Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public License
      15     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      16  
      17  #include <config.h>
      18  
      19  /* Specification.  */
      20  #include <stdlib.h>
      21  
      22  #include <errno.h>
      23  
      24  int
      25  posix_memalign (void **memptr, size_t alignment, size_t size)
      26  #undef posix_memalign
      27  {
      28    /* Round up SIZE to the next multiple of ALIGNMENT, namely
      29       (SIZE + ALIGNMENT - 1) & ~(ALIGNMENT - 1).  */
      30    size += alignment - 1;
      31    if (size >= alignment - 1) /* no overflow? */
      32      return posix_memalign (memptr, alignment, size & ~(size_t)(alignment - 1));
      33    else
      34      return ENOMEM;
      35  }