80 lines
2.7 KiB
C
80 lines
2.7 KiB
C
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/* xalloc.h -- malloc with out-of-memory checking
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Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
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1999, 2000, 2003, 2004 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#ifndef XALLOC_H_
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# define XALLOC_H_
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# include <stddef.h>
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# ifdef __cplusplus
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extern "C" {
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# endif
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# ifndef __attribute__
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# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__
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# define __attribute__(x)
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# endif
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# endif
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# ifndef ATTRIBUTE_NORETURN
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# define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
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# endif
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/* This function is always triggered when memory is exhausted.
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It must be defined by the application, either explicitly
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or by using gnulib's xalloc-die module. This is the
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function to call when one wants the program to die because of a
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memory allocation failure. */
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extern void xalloc_die (void) ATTRIBUTE_NORETURN;
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void *xmalloc (size_t s);
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void *xnmalloc (size_t n, size_t s);
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void *xzalloc (size_t s);
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void *xcalloc (size_t n, size_t s);
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void *xrealloc (void *p, size_t s);
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void *xnrealloc (void *p, size_t n, size_t s);
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void *x2realloc (void *p, size_t *pn);
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void *x2nrealloc (void *p, size_t *pn, size_t s);
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void *xmemdup (void const *p, size_t s);
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char *xstrdup (char const *str);
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/* Return 1 if an array of N objects, each of size S, cannot exist due
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to size arithmetic overflow. S must be positive and N must be
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nonnegative. This is a macro, not an inline function, so that it
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works correctly even when SIZE_MAX < N.
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By gnulib convention, SIZE_MAX represents overflow in size
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calculations, so the conservative dividend to use here is
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SIZE_MAX - 1, since SIZE_MAX might represent an overflowed value.
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However, malloc (SIZE_MAX) fails on all known hosts where
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sizeof (ptrdiff_t) <= sizeof (size_t), so do not bother to test for
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exactly-SIZE_MAX allocations on such hosts; this avoids a test and
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branch when S is known to be 1. */
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# define xalloc_oversized(n, s) \
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((size_t) (sizeof (ptrdiff_t) <= sizeof (size_t) ? -1 : -2) / (s) < (n))
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# ifdef __cplusplus
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}
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# endif
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#endif /* !XALLOC_H_ */
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