1 /* Safe automatic memory allocation with out of memory checking. 2 Copyright (C) 2003, 2005, 2007, 2009-2020 Free Software Foundation, Inc. 3 Written by Bruno Haible <bruno@clisp.org>, 2003. 4 5 This program is free software: you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <https://www.gnu.org/licenses/>. */ 17 18 #ifndef _XMALLOCA_H 19 #define _XMALLOCA_H 20 21 #include "malloca.h" 22 #include "xalloc.h" 23 24 25 #ifdef __cplusplus 26 extern "C" { 27 #endif 28 29 30 /* xmalloca(N) is a checking safe variant of alloca(N). It allocates N bytes 31 of memory allocated on the stack, that must be freed using freea() before 32 the function returns. Upon failure, it exits with an error message. */ 33 #if HAVE_ALLOCA 34 # define xmalloca(N) \ 35 ((N) < 4032 - (2 * sa_alignment_max - 1) \ 36 ? (void *) (((uintptr_t) (char *) alloca ((N) + 2 * sa_alignment_max - 1) \ 37 + (2 * sa_alignment_max - 1)) \ 38 & ~(uintptr_t)(2 * sa_alignment_max - 1)) \ 39 : xmmalloca (N)) 40 extern void * xmmalloca (size_t n); 41 #else 42 # define xmalloca(N) \ 43 xmalloc (N) 44 #endif 45 46 /* xnmalloca(N,S) is an overflow-safe variant of xmalloca (N * S). 47 It allocates an array of N objects, each with S bytes of memory, 48 on the stack. S must be positive and N must be nonnegative. 49 The array must be freed using freea() before the function returns. 50 Upon failure, it exits with an error message. */ 51 #if HAVE_ALLOCA 52 /* Rely on xmalloca (SIZE_MAX) calling xalloc_die (). */ 53 # define xnmalloca(n, s) \ 54 xmalloca (xalloc_oversized ((n), (s)) ? (size_t) (-1) : (n) * (s)) 55 #else 56 # define xnmalloca(n, s) \ 57 xnmalloc ((n), (s)) 58 #endif 59 60 61 #ifdef __cplusplus 62 } 63 #endif 64 65 66 #endif /* _XMALLOCA_H */ 67