root/maint/gnulib/lib/posix_memalign.c

/* */

DEFINITIONS

1. posix_memalign

   1 /* A posix_memalign() function that works around platform bugs.
   2    Copyright (C) 2020-2021 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 }

/* */