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utils: add set_bitmap/test_bitmap functions

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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>
This commit is contained in:
Kevin Pouget 2019-11-25 09:52:25 +01:00 committed by Frediano Ziglio
parent b2f919f109
commit ec4e44200a
1 changed files with 24 additions and 0 deletions
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24
common/utils.h
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@ -21,6 +21,7 @@
#include <glib.h>
#include <glib-object.h>
#include <stdint.h>
G_BEGIN_DECLS
@ -28,6 +29,29 @@ const char *spice_genum_get_nick(GType enum_type, gint value);
int spice_genum_get_value(GType enum_type, const char *nick,
gint default_value);
#define BIT_BYTE(nr) ((nr) / 8)
#define BIT_MASK(nr) (1 << ((nr) % 8))
/**
* set_bitmap - Set a bit in memory
* @nr: the bit to set
* @addr: the address to start counting from
*/
static inline void set_bitmap(uint32_t nr, uint8_t *addr)
{
addr[BIT_BYTE(nr)] |= BIT_MASK(nr);
}
/**
* test_bitmap - Determine whether a bit is set
* @nr: bit number to test
* @addr: Address to start counting from
*/
static inline int test_bitmap(uint32_t nr, const uint8_t *addr)
{
return 1 & (addr[BIT_BYTE(nr)] >> (nr % 8));
}
G_END_DECLS
#endif //H_SPICE_COMMON_UTILS