Dogcows Code - chaz/tar/blob - lib/xalloc.h

   1 /* xalloc.h -- malloc with out-of-memory checking
   2    Copyright (C) 1990-1998, 1999, 2000 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 #ifndef XALLOC_H_
  19 # define XALLOC_H_
  20
  21 # ifndef PARAMS
  22 #  if defined PROTOTYPES || (defined __STDC__ && __STDC__)
  23 #   define PARAMS(Args) Args
  24 #  else
  25 #   define PARAMS(Args) ()
  26 #  endif
  27 # endif
  28
  29 # ifndef __attribute__
  30 #  if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__
  31 #   define __attribute__(x)
  32 #  endif
  33 # endif
  34
  35 # ifndef ATTRIBUTE_NORETURN
  36 #  define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
  37 # endif
  38
  39 /* Exit value when the requested amount of memory is not available.
  40    It is initialized to EXIT_FAILURE, but the caller may set it to
  41    some other value.  */
  42 extern int xalloc_exit_failure;
  43
  44 /* If this pointer is non-zero, run the specified function upon each
  45    allocation failure.  It is initialized to zero. */
  46 extern void (*xalloc_fail_func) PARAMS ((void));
  47
  48 /* If XALLOC_FAIL_FUNC is undefined or a function that returns, this
  49    message is output.  It is translated via gettext.
  50    Its value is "memory exhausted".  */
  51 extern char const xalloc_msg_memory_exhausted[];
  52
  53 /* This function is always triggered when memory is exhausted.  It is
  54    in charge of honoring the three previous items.  This is the
  55    function to call when one wants the program to die because of a
  56    memory allocation failure.  */
  57 extern void xalloc_die PARAMS ((void)) ATTRIBUTE_NORETURN;
  58
  59 void *xmalloc PARAMS ((size_t n));
  60 void *xcalloc PARAMS ((size_t n, size_t s));
  61 void *xrealloc PARAMS ((void *p, size_t n));
  62 char *xstrdup PARAMS ((const char *str));
  63
  64 # define XMALLOC(Type, N_items) ((Type *) xmalloc (sizeof (Type) * (N_items)))
  65 # define XCALLOC(Type, N_items) ((Type *) xcalloc (sizeof (Type), (N_items)))
  66 # define XREALLOC(Ptr, Type, N_items) \
  67   ((Type *) xrealloc ((void *) (Ptr), sizeof (Type) * (N_items)))
  68
  69 /* Declare and alloc memory for VAR of type TYPE. */
  70 # define NEW(Type, Var)  Type *(Var) = XMALLOC (Type, 1)
  71
  72 /* Free VAR only if non NULL. */
  73 # define XFREE(Var)     \
  74    do {                 \
  75       if (Var)          \
  76         free (Var);     \
  77    } while (0)
  78
  79 /* Return a pointer to a malloc'ed copy of the array SRC of NUM elements. */
  80 # define CCLONE(Src, Num) \
  81   (memcpy (xmalloc (sizeof (*Src) * (Num)), (Src), sizeof (*Src) * (Num)))
  82
  83 /* Return a malloc'ed copy of SRC. */
  84 # define CLONE(Src) CCLONE (Src, 1)
  85
  86
  87 #endif /* !XALLOC_H_ */