diff options
Diffstat (limited to 'lib/malloca.h')
| -rw-r--r-- | lib/malloca.h | 56 |
1 files changed, 23 insertions, 33 deletions
diff --git a/lib/malloca.h b/lib/malloca.h index 8e47c166..7ec235f3 100644 --- a/lib/malloca.h +++ b/lib/malloca.h @@ -1,28 +1,19 @@ /* Safe automatic memory allocation. - Copyright (C) 2003-2007, 2009-2018 Free Software Foundation, Inc. + Copyright (C) 2003-2007, 2009-2022 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 either: + This file is free software: you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. - * the GNU Lesser General Public License as published by the Free - Software Foundation; either version 3 of the License, or (at your - option) any later version. - - or - - * the GNU General Public License as published by the Free - Software Foundation; either version 2 of the License, or (at your - option) any later version. - - or both in parallel, as here. - This program is distributed in the hope that it will be useful, + This file 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. + GNU Lesser 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 <https://www.gnu.org/licenses/>. */ + You should have received a copy of the GNU Lesser General Public License + along with this program. If not, see <https://www.gnu.org/licenses/>. */ #ifndef _MALLOCA_H #define _MALLOCA_H @@ -60,6 +51,13 @@ extern "C" { # define safe_alloca(N) ((void) (N), NULL) #endif +/* Free a block of memory allocated through malloca(). */ +#if HAVE_ALLOCA +extern void freea (void *p); +#else +# define freea free +#endif + /* malloca(N) is a 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 returns NULL. */ @@ -74,20 +72,16 @@ extern "C" { # define malloca(N) \ mmalloca (N) #endif -extern void * mmalloca (size_t n); - -/* Free a block of memory allocated through malloca(). */ -#if HAVE_ALLOCA -extern void freea (void *p); -#else -# define freea free -#endif +extern void *mmalloca (size_t n) + _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC (freea, 1) + _GL_ATTRIBUTE_ALLOC_SIZE ((1)); /* nmalloca(N,S) is an overflow-safe variant of malloca (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. + on the stack. N and S should be nonnegative and free of side effects. The array must be freed using freea() before the function returns. */ -#define nmalloca(n, s) (xalloc_oversized (n, s) ? NULL : malloca ((n) * (s))) +#define nmalloca(n, s) \ + (xalloc_oversized (n, s) ? NULL : malloca ((n) * (size_t) (s))) #ifdef __cplusplus @@ -98,7 +92,7 @@ extern void freea (void *p); /* ------------------- Auxiliary, non-public definitions ------------------- */ /* Determine the alignment of a type at compile time. */ -#if defined __GNUC__ || defined __IBM__ALIGNOF__ +#if defined __GNUC__ || defined __clang__ || defined __IBM__ALIGNOF__ # define sa_alignof __alignof__ #elif defined __cplusplus template <class type> struct sa_alignof_helper { char __slot1; type __slot2; }; @@ -121,14 +115,10 @@ enum among all elementary types. */ sa_alignment_long = sa_alignof (long), sa_alignment_double = sa_alignof (double), -#if HAVE_LONG_LONG_INT sa_alignment_longlong = sa_alignof (long long), -#endif sa_alignment_longdouble = sa_alignof (long double), sa_alignment_max = ((sa_alignment_long - 1) | (sa_alignment_double - 1) -#if HAVE_LONG_LONG_INT | (sa_alignment_longlong - 1) -#endif | (sa_alignment_longdouble - 1) ) + 1 }; |