2001-08-20 Robert Anisko <robert.anisko@epita.fr>

[bison.git] / lib / xalloc.h

/* xalloc.h -- malloc with out-of-memory checking
   Copyright (C) 1990-1998, 1999, 2000 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 2, 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, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#ifndef XALLOC_H_
# define XALLOC_H_

# ifndef PARAMS
#  if defined PROTOTYPES || (defined __STDC__ && __STDC__)
#   define PARAMS(Args) Args
#  else
#   define PARAMS(Args) ()
#  endif
# endif

# ifndef __attribute__
#  if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__
#   define __attribute__(x)
#  endif
# endif

# ifndef ATTRIBUTE_NORETURN
#  define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
# endif

/* Exit value when the requested amount of memory is not available.
   It is initialized to EXIT_FAILURE, but the caller may set it to
   some other value.  */
extern int xalloc_exit_failure;

/* If this pointer is non-zero, run the specified function upon each
   allocation failure.  It is initialized to zero. */
extern void (*xalloc_fail_func) PARAMS ((void));

/* If XALLOC_FAIL_FUNC is undefined or a function that returns, this
   message is output.  It is translated via gettext.
   Its value is "memory exhausted".  */
extern char const xalloc_msg_memory_exhausted[];

/* 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 PARAMS ((void)) ATTRIBUTE_NORETURN;

void *xmalloc PARAMS ((size_t n));
void *xcalloc PARAMS ((size_t n, size_t s));
void *xrealloc PARAMS ((void *p, size_t n));
char *xstrdup PARAMS ((const char *str));

# define XMALLOC(Type, N_items) ((Type *) xmalloc (sizeof (Type) * (N_items)))
# define XCALLOC(Type, N_items) ((Type *) xcalloc (sizeof (Type), (N_items)))
# define XREALLOC(Ptr, Type, N_items) \
  ((Type *) xrealloc ((void *) (Ptr), sizeof (Type) * (N_items)))

/* Declare and alloc memory for VAR of type TYPE. */
# define NEW(Type, Var)  Type *(Var) = XMALLOC (Type, 1)

/* Free VAR only if non NULL. */
# define XFREE(Var)	\
   do {                 \
      if (Var)          \
        free (Var);     \
   } while (0)

/* Return a pointer to a malloc'ed copy of the array SRC of NUM elements. */
# define CCLONE(Src, Num) \
  (memcpy (xmalloc (sizeof (*Src) * (Num)), (Src), sizeof (*Src) * (Num)))

/* Return a malloc'ed copy of SRC. */
# define CLONE(Src) CCLONE (Src, 1)

/* Wrappers for standard functions. */
#define	CALLOC(t, n) ((t *) calloc (sizeof (t), (n)))
#define MALLOC(t, n) ((t *) xmalloc (sizeof (t) * (n)))
#define REALLOC(o, t, n) ((t *) xrealloc ((o), sizeof (t) * (n)))

#endif /* !XALLOC_H_ */