gl/xalloc.h

   1 /* xalloc.h -- malloc with out-of-memory checking
   2
   3    Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   4    1999, 2000, 2003 Free Software Foundation, Inc.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2, or (at your option)
   9    any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software Foundation,
  18    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 #ifndef XALLOC_H_
  21 # define XALLOC_H_
  22
  23 # include <stddef.h>
  24
  25 # ifndef __attribute__
  26 #  if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__
  27 #   define __attribute__(x)
  28 #  endif
  29 # endif
  30
  31 # ifndef ATTRIBUTE_NORETURN
  32 #  define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
  33 # endif
  34
  35 /* If this pointer is non-zero, run the specified function upon each
  36    allocation failure.  It is initialized to zero. */
  37 extern void (*xalloc_fail_func) (void);
  38
  39 /* If XALLOC_FAIL_FUNC is undefined or a function that returns, this
  40    message is output.  It is translated via gettext.
  41    Its value is "memory exhausted".  */
  42 extern char const xalloc_msg_memory_exhausted[];
  43
  44 /* This function is always triggered when memory is exhausted.  It is
  45    in charge of honoring the two previous items.  It exits with status
  46    exit_failure (defined in exitfail.h).  This is the
  47    function to call when one wants the program to die because of a
  48    memory allocation failure.  */
  49 extern void xalloc_die (void) ATTRIBUTE_NORETURN;
  50
  51 void *xmalloc (size_t n);
  52 void *xcalloc (size_t n, size_t s);
  53 void *xrealloc (void *p, size_t n);
  54 char *xstrdup (const char *str);
  55
  56 # define XMALLOC(Type, N_items) xmalloc (sizeof (Type) * (N_items))
  57 # define XCALLOC(Type, N_items) xcalloc (sizeof (Type), N_items)
  58 # define XREALLOC(Ptr, Type, N_items) xrealloc (Ptr, sizeof (Type) * (N_items))
  59
  60 /* Declare and alloc memory for VAR of type TYPE. */
  61 # define NEW(Type, Var)  Type *(Var) = XMALLOC (Type, 1)
  62
  63 /* Free VAR only if non NULL. */
  64 # define XFREE(Var)     \
  65    do {                 \
  66       if (Var)          \
  67         free (Var);     \
  68    } while (0)
  69
  70 /* Return a pointer to a malloc'ed copy of the array SRC of NUM elements. */
  71 # define CCLONE(Src, Num) \
  72   (memcpy (xmalloc (sizeof *(Src) * (Num)), Src, sizeof *(Src) * (Num)))
  73
  74 /* Return a malloc'ed copy of SRC. */
  75 # define CLONE(Src) CCLONE (Src, 1)
  76
  77
  78 #endif /* !XALLOC_H_ */