You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
158 lines
5.1 KiB
158 lines
5.1 KiB
/* malloc with out of memory checking. |
|
Copyright (C) 2001-2004, 2006 Free Software Foundation, Inc. |
|
Written by Bruno Haible <haible@clisp.cons.org>, 2001. |
|
|
|
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 _XALLOC_H |
|
#define _XALLOC_H |
|
|
|
#include <stddef.h> |
|
|
|
|
|
#ifdef __cplusplus |
|
extern "C" { |
|
#endif |
|
|
|
|
|
/* Defined in xmalloc.c. */ |
|
|
|
/* Allocate SIZE bytes of memory dynamically, with error checking. */ |
|
extern void *xmalloc (size_t size); |
|
|
|
/* Allocate memory for NMEMB elements of SIZE bytes, with error checking. |
|
SIZE must be > 0. */ |
|
extern void *xnmalloc (size_t nmemb, size_t size); |
|
|
|
/* Allocate SIZE bytes of memory dynamically, with error checking, |
|
and zero it. */ |
|
extern void *xzalloc (size_t size); |
|
|
|
/* Allocate memory for NMEMB elements of SIZE bytes, with error checking, |
|
and zero it. */ |
|
extern void *xcalloc (size_t nmemb, size_t size); |
|
|
|
/* Change the size of an allocated block of memory PTR to SIZE bytes, |
|
with error checking. If PTR is NULL, run xmalloc. */ |
|
extern void *xrealloc (void *ptr, size_t size); |
|
#ifdef __cplusplus |
|
} |
|
template <typename T> |
|
inline T * xrealloc (T * ptr, size_t size) |
|
{ |
|
return (T *) xrealloc ((void *) ptr, size); |
|
} |
|
extern "C" { |
|
#endif |
|
|
|
/* This function is always triggered when memory is exhausted. It is |
|
in charge of honoring the three previous items. This is the |
|
function to call when one wants the program to die because of a |
|
memory allocation failure. */ |
|
extern void xalloc_die (void) |
|
#if (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 5)) && !__STRICT_ANSI__ |
|
__attribute__ ((__noreturn__)) |
|
#endif |
|
; |
|
|
|
/* In the following macros, T must be an elementary or structure/union or |
|
typedef'ed type, or a pointer to such a type. To apply one of the |
|
following macros to a function pointer or array type, you need to typedef |
|
it first and use the typedef name. */ |
|
|
|
/* Allocate an object of type T dynamically, with error checking. */ |
|
/* extern T *XMALLOC (typename T); */ |
|
#define XMALLOC(T) \ |
|
((T *) xmalloc (sizeof (T))) |
|
|
|
/* Allocate memory for NMEMB elements of type T, with error checking. */ |
|
/* extern T *XNMALLOC (size_t nmemb, typename T); */ |
|
#if HAVE_INLINE |
|
/* xnmalloc performs a division and multiplication by sizeof (T). Arrange to |
|
perform the division at compile-time and the multiplication with a factor |
|
known at compile-time. */ |
|
# define XNMALLOC(N,T) \ |
|
((T *) (sizeof (T) == 1 \ |
|
? xmalloc (N) \ |
|
: xnboundedmalloc(N, (size_t) (sizeof (ptrdiff_t) <= sizeof (size_t) ? -1 : -2) / sizeof (T), sizeof (T)))) |
|
static inline void * |
|
xnboundedmalloc (size_t n, size_t bound, size_t s) |
|
{ |
|
if (n > bound) |
|
xalloc_die (); |
|
return xmalloc (n * s); |
|
} |
|
#else |
|
# define XNMALLOC(N,T) \ |
|
((T *) (sizeof (T) == 1 ? xmalloc (N) : xnmalloc (N, sizeof (T)))) |
|
#endif |
|
|
|
/* Allocate an object of type T dynamically, with error checking, |
|
and zero it. */ |
|
/* extern T *XZALLOC (typename T); */ |
|
#define XZALLOC(T) \ |
|
((T *) xzalloc (sizeof (T))) |
|
|
|
/* Allocate memory for NMEMB elements of type T, with error checking, |
|
and zero it. */ |
|
/* extern T *XCALLOC (size_t nmemb, typename T); */ |
|
#define XCALLOC(N,T) \ |
|
((T *) xcalloc (N, sizeof (T))) |
|
|
|
/* Return a pointer to a new buffer of N bytes. This is like xmalloc, |
|
except it returns char *. */ |
|
#define xcharalloc(N) \ |
|
XNMALLOC (N, char) |
|
|
|
|
|
/* Defined in xstrdup.c. */ |
|
|
|
/* Return a newly allocated copy of the N bytes of memory starting at P. */ |
|
extern void *xmemdup (const void *p, size_t n); |
|
#ifdef __cplusplus |
|
} |
|
template <typename T> |
|
inline T * xmemdup (const T * p, size_t n) |
|
{ |
|
return (T *) xmemdup ((const void *) p, n); |
|
} |
|
extern "C" { |
|
#endif |
|
|
|
/* Return a newly allocated copy of STRING. */ |
|
extern char *xstrdup (const char *string); |
|
|
|
|
|
/* Return 1 if an array of N objects, each of size S, cannot exist due |
|
to size arithmetic overflow. S must be positive and N must be |
|
nonnegative. This is a macro, not an inline function, so that it |
|
works correctly even when SIZE_MAX < N. |
|
|
|
By gnulib convention, SIZE_MAX represents overflow in size |
|
calculations, so the conservative dividend to use here is |
|
SIZE_MAX - 1, since SIZE_MAX might represent an overflowed value. |
|
However, malloc (SIZE_MAX) fails on all known hosts where |
|
sizeof (ptrdiff_t) <= sizeof (size_t), so do not bother to test for |
|
exactly-SIZE_MAX allocations on such hosts; this avoids a test and |
|
branch when S is known to be 1. */ |
|
# define xalloc_oversized(n, s) \ |
|
((size_t) (sizeof (ptrdiff_t) <= sizeof (size_t) ? -1 : -2) / (s) < (n)) |
|
|
|
|
|
#ifdef __cplusplus |
|
} |
|
#endif |
|
|
|
|
|
#endif /* _XALLOC_H */
|
|
|