wget/src/xmalloc.h

/* xmalloc.c declarations.
   Copyright (C) 2003 Free Software Foundation, Inc.

This file is part of GNU Wget.

GNU Wget 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 2 of the License, or
 (at your option) any later version.

GNU Wget 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 Wget; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

In addition, as a special exception, the Free Software Foundation
gives permission to link the code of its release of Wget with the
OpenSSL project's "OpenSSL" library (or with modified versions of it
that use the same license as the "OpenSSL" library), and distribute
the linked executables.  You must obey the GNU General Public License
in all respects for all of the code used other than "OpenSSL".  If you
modify this file, you may extend this exception to your version of the
file, but you are not obligated to do so.  If you do not wish to do
so, delete this exception statement from your version.  */

#ifndef XMALLOC_H
#define XMALLOC_H

/* Define this to use Wget's builtin malloc debugging, which is crude
   but occasionally useful.  It will make Wget a lot slower and
   larger, and susceptible to aborting if malloc_table overflows, so
   it should be used by developers only.  */
#undef DEBUG_MALLOC

/* When DEBUG_MALLOC is not defined (which is normally the case), the
   allocator identifiers are mapped to checking_* wrappers, which exit
   Wget if malloc/realloc/strdup return NULL

   In DEBUG_MALLOC mode, the allocators are mapped to debugging_*
   wrappers, which also record the file and line from which the
   allocation was attempted.  At the end of the program, a detailed
   summary of unfreed allocations is displayed.

   *Note*: xfree(NULL) aborts in both modes.  If the pointer you're
   freeing can be NULL, use xfree_null instead.  */

#ifndef DEBUG_MALLOC

#define xmalloc  checking_malloc
#define xmalloc0 checking_malloc0
#define xrealloc checking_realloc
#define xstrdup  checking_strdup
#define xfree    checking_free

void *checking_malloc (size_t);
void *checking_malloc0 (size_t);
void *checking_realloc (void *, size_t);
char *checking_strdup (const char *);
void checking_free (void *);

#else  /* DEBUG_MALLOC */

#define xmalloc(s)     debugging_malloc (s, __FILE__, __LINE__)
#define xmalloc0(s)    debugging_malloc0 (s, __FILE__, __LINE__)
#define xrealloc(p, s) debugging_realloc (p, s, __FILE__, __LINE__)
#define xstrdup(p)     debugging_strdup (p, __FILE__, __LINE__)
#define xfree(p)       debugging_free (p, __FILE__, __LINE__)

void *debugging_malloc (size_t, const char *, int);
void *debugging_malloc0 (size_t, const char *, int);
void *debugging_realloc (void *, size_t, const char *, int);
char *debugging_strdup (const char *, const char *, int);
void debugging_free (void *, const char *, int);

#endif /* DEBUG_MALLOC */

/* Macros that interface to malloc, but know about type sizes, and
   cast the result to the appropriate type.  The casts are not
   necessary in standard C, but Wget performs them anyway for the sake
   of pre-standard environments and possibly C++.  */

#define xnew(type) (xmalloc (sizeof (type)))
#define xnew0(type) (xmalloc0 (sizeof (type)))
#define xnew_array(type, len) (xmalloc ((len) * sizeof (type)))
#define xnew0_array(type, len) (xmalloc0 ((len) * sizeof (type)))

#define alloca_array(type, size) ((type *) alloca ((size) * sizeof (type)))

/* Free P if it is non-NULL.  C requires free() to behaves this way by
   default, but Wget's code is historically careful not to pass NULL
   to free.  This allows us to assert p!=NULL in xfree to check
   additional errors.  (But we currently don't do that!)  */
#define xfree_null(p) if (!(p)) ; else xfree (p)

#endif /* XMALLOC_H */