+++ /dev/null
-/* xalloc.h -- malloc with out-of-memory checking
-
- Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2003, 2004, 2006, 2007, 2008 Free Software Foundation, Inc.
-
- 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
-
-
-# ifndef __attribute__
-# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8)
-# define __attribute__(x)
-# endif
-# endif
-
-# ifndef ATTRIBUTE_NORETURN
-# define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
-# endif
-
-# ifndef ATTRIBUTE_MALLOC
-# if __GNUC__ >= 3
-# define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
-# else
-# define ATTRIBUTE_MALLOC
-# endif
-# endif
-
-/* This function is always triggered when memory is exhausted.
- It must be defined by the application, either explicitly
- or by using gnulib's xalloc-die module. This is the
- function to call when one wants the program to die because of a
- memory allocation failure. */
-extern void xalloc_die (void) ATTRIBUTE_NORETURN;
-
-void *xmalloc (size_t s) ATTRIBUTE_MALLOC;
-void *xzalloc (size_t s) ATTRIBUTE_MALLOC;
-void *xcalloc (size_t n, size_t s) ATTRIBUTE_MALLOC;
-void *xrealloc (void *p, size_t s);
-void *x2realloc (void *p, size_t *pn);
-void *xmemdup (void const *p, size_t s) ATTRIBUTE_MALLOC;
-char *xstrdup (char const *str) ATTRIBUTE_MALLOC;
-
-/* 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))
-
-
-/* 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 N elements of type T, with error checking. */
-/* extern t *XNMALLOC (size_t n, typename t); */
-# define XNMALLOC(n, t) \
- ((t *) (sizeof (t) == 1 ? xmalloc (n) : xnmalloc (n, sizeof (t))))
-
-/* 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 N elements of type T, with error checking,
- and zero it. */
-/* extern t *XCALLOC (size_t n, typename t); */
-# define XCALLOC(n, t) \
- ((t *) (sizeof (t) == 1 ? xzalloc (n) : xcalloc (n, sizeof (t))))
-
-
-# if HAVE_INLINE
-# define static_inline static inline
-# else
- void *xnmalloc (size_t n, size_t s) ATTRIBUTE_MALLOC;
- void *xnrealloc (void *p, size_t n, size_t s);
- void *x2nrealloc (void *p, size_t *pn, size_t s);
- char *xcharalloc (size_t n) ATTRIBUTE_MALLOC;
-# endif
-
-# ifdef static_inline
-
-/* Allocate an array of N objects, each with S bytes of memory,
- dynamically, with error checking. S must be nonzero. */
-
-static_inline void *xnmalloc (size_t n, size_t s) ATTRIBUTE_MALLOC;
-static_inline void *
-xnmalloc (size_t n, size_t s)
-{
- if (xalloc_oversized (n, s))
- xalloc_die ();
- return xmalloc (n * s);
-}
-
-/* Change the size of an allocated block of memory P to an array of N
- objects each of S bytes, with error checking. S must be nonzero. */
-
-static_inline void *
-xnrealloc (void *p, size_t n, size_t s)
-{
- if (xalloc_oversized (n, s))
- xalloc_die ();
- return xrealloc (p, n * s);
-}
-
-/* If P is null, allocate a block of at least *PN such objects;
- otherwise, reallocate P so that it contains more than *PN objects
- each of S bytes. *PN must be nonzero unless P is null, and S must
- be nonzero. Set *PN to the new number of objects, and return the
- pointer to the new block. *PN is never set to zero, and the
- returned pointer is never null.
-
- Repeated reallocations are guaranteed to make progress, either by
- allocating an initial block with a nonzero size, or by allocating a
- larger block.
-
- In the following implementation, nonzero sizes are increased by a
- factor of approximately 1.5 so that repeated reallocations have
- O(N) overall cost rather than O(N**2) cost, but the
- specification for this function does not guarantee that rate.
-
- Here is an example of use:
-
- int *p = NULL;
- size_t used = 0;
- size_t allocated = 0;
-
- void
- append_int (int value)
- {
- if (used == allocated)
- p = x2nrealloc (p, &allocated, sizeof *p);
- p[used++] = value;
- }
-
- This causes x2nrealloc to allocate a block of some nonzero size the
- first time it is called.
-
- To have finer-grained control over the initial size, set *PN to a
- nonzero value before calling this function with P == NULL. For
- example:
-
- int *p = NULL;
- size_t used = 0;
- size_t allocated = 0;
- size_t allocated1 = 1000;
-
- void
- append_int (int value)
- {
- if (used == allocated)
- {
- p = x2nrealloc (p, &allocated1, sizeof *p);
- allocated = allocated1;
- }
- p[used++] = value;
- }
-
- */
-
-static_inline void *
-x2nrealloc (void *p, size_t *pn, size_t s)
-{
- size_t n = *pn;
-
- if (! p)
- {
- if (! n)
- {
- /* The approximate size to use for initial small allocation
- requests, when the invoking code specifies an old size of
- zero. 64 bytes is the largest "small" request for the
- GNU C library malloc. */
- enum { DEFAULT_MXFAST = 64 };
-
- n = DEFAULT_MXFAST / s;
- n += !n;
- }
- }
- else
- {
- /* Set N = ceil (1.5 * N) so that progress is made if N == 1.
- Check for overflow, so that N * S stays in size_t range.
- The check is slightly conservative, but an exact check isn't
- worth the trouble. */
- if ((size_t) -1 / 3 * 2 / s <= n)
- xalloc_die ();
- n += (n + 1) / 2;
- }
-
- *pn = n;
- return xrealloc (p, n * s);
-}
-
-/* Return a pointer to a new buffer of N bytes. This is like xmalloc,
- except it returns char *. */
-
-static_inline char *xcharalloc (size_t n) ATTRIBUTE_MALLOC;
-static_inline char *
-xcharalloc (size_t n)
-{
- return XNMALLOC (n, char);
-}
-
-# endif
-
-# ifdef __cplusplus
-}
-
-/* C++ does not allow conversions from void * to other pointer types
- without a cast. Use templates to work around the problem when
- possible. */
-
-template <typename T> inline T *
-xrealloc (T *p, size_t s)
-{
- return (T *) xrealloc ((void *) p, s);
-}
-
-template <typename T> inline T *
-xnrealloc (T *p, size_t n, size_t s)
-{
- return (T *) xnrealloc ((void *) p, n, s);
-}
-
-template <typename T> inline T *
-x2realloc (T *p, size_t *pn)
-{
- return (T *) x2realloc ((void *) p, pn);
-}
-
-template <typename T> inline T *
-x2nrealloc (T *p, size_t *pn, size_t s)
-{
- return (T *) x2nrealloc ((void *) p, pn, s);
-}
-
-template <typename T> inline T *
-xmemdup (T const *p, size_t s)
-{
- return (T *) xmemdup ((void const *) p, s);
-}
-
-# endif
-
-
-#endif /* !XALLOC_H_ */
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