malloc.c (1375B)
1 /* -*-comment-start: "//";comment-end:""-*- 2 * GNU Mes --- Maxwell Equations of Software 3 * Copyright © 2016,2017,2018,2019,2021,2022 Jan (janneke) Nieuwenhuizen <janneke@gnu.org> 4 * Copyright © 2021 Danny Milosavljevic <dannym@scratchpost.org> 5 * 6 * This file is part of GNU Mes. 7 * 8 * GNU Mes is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 3 of the License, or (at 11 * your option) any later version. 12 * 13 * GNU Mes is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with GNU Mes. If not, see <http://www.gnu.org/licenses/>. 20 */ 21 22 #include <mes/lib.h> 23 #include <string.h> 24 #include <stddef.h> 25 #include <stdint.h> 26 27 char *__brk = 0; 28 29 void * 30 malloc (size_t size) 31 { 32 if (!__brk) 33 __brk = cast_long_to_charp (brk (0)); 34 #if !__M2__ 35 /* align what we give back. */ 36 __brk = (char*) (((uintptr_t) __brk 37 + sizeof (max_align_t) - 1) & -sizeof (max_align_t)); 38 #endif 39 if (brk (__brk + size) == -1) 40 return 0; 41 char *p = __brk; 42 __brk = __brk + size; 43 return p; 44 }