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 }