lib/posix_memalign.c

   1 /* A posix_memalign() function that works around platform bugs.
   2    Copyright (C) 2020 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program 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 General Public License for more details.
  13
  14    You should have received a copy of the GNU 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 }