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58 lines
2.1 KiB
C
58 lines
2.1 KiB
C
/*
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* libvirt-utils.h: misc helper APIs for python binding
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*
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* Copyright (C) 2013 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef __LIBVIRT_UTILS_H__
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# define __LIBVIRT_UTILS_H__
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# define STREQ(a,b) (strcmp(a,b) == 0)
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# ifndef MIN
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# define MIN(a,b) (((a) < (b)) ? (a) : (b))
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# endif
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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 a 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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/* The __attribute__((__warn_unused_result__)) feature
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is available in gcc versions 3.4 and newer,
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while the typeof feature has been available since 2.7 at least. */
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# if 3 < __GNUC__ + (4 <= __GNUC_MINOR__)
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# define ignore_value(x) \
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(__extension__ ({ __typeof__ (x) __x = (x); (void) __x; }))
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# else
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# define ignore_value(x) ((void) (x))
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# endif
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#endif /* __LIBVIRT_UTILS_H__ */
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