mirror of
https://gitlab.uni-freiburg.de/opensourcevdi/spice-common
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ec4e44200a
This patch introduces `set_bitmap` and `test_bitmap` + relevant macros, adapted from `<qemu>/include/qemu/bitops.h`. These functions differ from `set_bit`/`test_bit` as they can set/test bits in bit arrays longer than scalar data-types. Signed-off-by: Kevin Pouget <kpouget@redhat.com> Acked-by: Frediano Ziglio <fziglio@redhat.com>
58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
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/*
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Copyright (C) 2010, 2011, 2018 Red Hat, Inc.
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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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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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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef H_SPICE_COMMON_UTILS
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#define H_SPICE_COMMON_UTILS
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#include <glib.h>
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#include <glib-object.h>
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#include <stdint.h>
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G_BEGIN_DECLS
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const char *spice_genum_get_nick(GType enum_type, gint value);
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int spice_genum_get_value(GType enum_type, const char *nick,
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gint default_value);
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#define BIT_BYTE(nr) ((nr) / 8)
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#define BIT_MASK(nr) (1 << ((nr) % 8))
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/**
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* set_bitmap - Set a bit in memory
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* @nr: the bit to set
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* @addr: the address to start counting from
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*/
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static inline void set_bitmap(uint32_t nr, uint8_t *addr)
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{
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addr[BIT_BYTE(nr)] |= BIT_MASK(nr);
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}
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/**
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* test_bitmap - Determine whether a bit is set
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* @nr: bit number to test
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* @addr: Address to start counting from
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*/
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static inline int test_bitmap(uint32_t nr, const uint8_t *addr)
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{
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return 1 & (addr[BIT_BYTE(nr)] >> (nr % 8));
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}
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G_END_DECLS
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#endif //H_SPICE_COMMON_UTILS
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