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Diffstat (limited to 'lib/xmalloca.h')
-rw-r--r-- | lib/xmalloca.h | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/lib/xmalloca.h b/lib/xmalloca.h new file mode 100644 index 0000000..1a5fb6d --- /dev/null +++ b/lib/xmalloca.h @@ -0,0 +1,64 @@ +/* Safe automatic memory allocation with out of memory checking. + Copyright (C) 2003, 2005, 2007, 2009, 2010 Free Software Foundation, Inc. + Written by Bruno Haible <bruno@clisp.org>, 2003. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. */ + +#ifndef _XMALLOCA_H +#define _XMALLOCA_H + +#include "malloca.h" +#include "xalloc.h" + + +#ifdef __cplusplus +extern "C" { +#endif + + +/* xmalloca(N) is a checking safe variant of alloca(N). It allocates N bytes + of memory allocated on the stack, that must be freed using freea() before + the function returns. Upon failure, it exits with an error message. */ +#if HAVE_ALLOCA +# define xmalloca(N) \ + ((N) < 4032 - sa_increment \ + ? (void *) ((char *) alloca ((N) + sa_increment) + sa_increment) \ + : xmmalloca (N)) +extern void * xmmalloca (size_t n); +#else +# define xmalloca(N) \ + xmalloc (N) +#endif + +/* xnmalloca(N,S) is an overflow-safe variant of xmalloca (N * S). + It allocates an array of N objects, each with S bytes of memory, + on the stack. S must be positive and N must be nonnegative. + The array must be freed using freea() before the function returns. + Upon failure, it exits with an error message. */ +#if HAVE_ALLOCA +/* Rely on xmalloca (SIZE_MAX) calling xalloc_die (). */ +# define xnmalloca(n, s) \ + xmalloca (xalloc_oversized ((n), (s)) ? (size_t) (-1) : (n) * (s)) +#else +# define xnmalloca(n, s) \ + xnmalloc ((n), (s)) +#endif + + +#ifdef __cplusplus +} +#endif + + +#endif /* _XMALLOCA_H */ |