Mercurial > gnulib
annotate lib/xmalloca.h @ 40203:30d91797009f
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| author | Karl Berry <karl@freefriends.org> |
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| date | Fri, 01 Mar 2019 08:42:42 -0800 |
| parents | b06060465f09 |
| children |
| rev | line source |
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| 8944 | 1 /* Safe automatic memory allocation with out of memory checking. |
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maint: Run 'make update-copyright'
Paul Eggert <eggert@cs.ucla.edu>
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2 Copyright (C) 2003, 2005, 2007, 2009-2019 Free Software Foundation, Inc. |
| 8944 | 3 Written by Bruno Haible <bruno@clisp.org>, 2003. |
| 4 | |
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Change copyright notice from GPLv2+ to GPLv3+.
Bruno Haible <bruno@clisp.org>
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5 This program is free software: you can redistribute it and/or modify |
| 8944 | 6 it under the terms of the GNU General Public License as published by |
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Bruno Haible <bruno@clisp.org>
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7 the Free Software Foundation; either version 3 of the License, or |
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8 (at your option) any later version. |
| 8944 | 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 | |
| 19190 | 16 along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| 8944 | 17 |
| 18 #ifndef _XMALLOCA_H | |
| 19 #define _XMALLOCA_H | |
| 20 | |
| 21 #include "malloca.h" | |
| 9559 | 22 #include "xalloc.h" |
| 8944 | 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 | |
| 9318 | 31 of memory allocated on the stack, that must be freed using freea() before |
| 8944 | 32 the function returns. Upon failure, it exits with an error message. */ |
| 33 #if HAVE_ALLOCA | |
| 34 # define xmalloca(N) \ | |
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35 ((N) < 4032 - (2 * sa_alignment_max - 1) \ |
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36 ? (void *) (((uintptr_t) (char *) alloca ((N) + 2 * sa_alignment_max - 1) \ |
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37 + (2 * sa_alignment_max - 1)) \ |
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38 & ~(uintptr_t)(2 * sa_alignment_max - 1)) \ |
| 8944 | 39 : xmmalloca (N)) |
| 40 extern void * xmmalloca (size_t n); | |
| 41 #else | |
| 42 # define xmalloca(N) \ | |
| 43 xmalloc (N) | |
| 44 #endif | |
| 45 | |
| 9559 | 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 | |
| 8944 | 59 |
| 60 | |
| 61 #ifdef __cplusplus | |
| 62 } | |
| 63 #endif | |
| 64 | |
| 65 | |
| 66 #endif /* _XMALLOCA_H */ |