preproc.h File Reference

Preprocessor macros for global use. More...

#include <fcntl.h>
#include <sys/stat.h>

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Defines
#define	MODE_T_SHIFT_BITS   (_BITCOUNT(S_IFMT ^ (S_IFMT-1)) -1)
	How many bits a mode_t must be shifted to get the packed representation.
#define	PACKED_MODE_T_NEEDED_BITS   (_BITCOUNT(S_IFMT))
	The number of bits needed for storage.
#define	TEST_PACKED(test, val)   test(PACKED_to_MODE_T(val))
	Simplification for testing packed modes.
#define	_BITCOUNTx(x, m, s)   ( ((x) & m) + (((x) & (m << s)) >> s) )
	Macros for counting the bits set.
#define	_BITCOUNT6(x)   (_BITCOUNTx( (x), 0x5555555555555555ULL, 1))
#define	_BITCOUNT5(x)   (_BITCOUNTx(_BITCOUNT6(x), 0x3333333333333333ULL, 2))
#define	_BITCOUNT4(x)   (_BITCOUNTx(_BITCOUNT5(x), 0x0f0f0f0f0f0f0f0fULL, 4))
#define	_BITCOUNT3(x)   (_BITCOUNTx(_BITCOUNT4(x), 0x00ff00ff00ff00ffULL, 8))
#define	_BITCOUNT2(x)   (_BITCOUNTx(_BITCOUNT3(x), 0x0000ffff0000ffffULL, 16))
#define	_BITCOUNT1(x)   (_BITCOUNTx(_BITCOUNT2(x), 0x00000000ffffffffULL, 32))
#define	_BITCOUNT(x)   ( (int)_BITCOUNT1(x) )
#define	MODE_T_to_PACKED(mode)   ((mode) >> MODE_T_SHIFT_BITS)
	How to convert from mode_t to the packed representation (in struct estat) and back.
#define	PACKED_to_MODE_T(p)   ((p) << MODE_T_SHIFT_BITS)

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Detailed Description

Preprocessor macros for global use.

Definition in file preproc.h.

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Define Documentation

#define _BITCOUNT

(

x

)

( (int)_BITCOUNT1(x) )

Definition at line 29 of file preproc.h.

#define _BITCOUNT1

(

x

)

(_BITCOUNTx(_BITCOUNT2(x), 0x00000000ffffffffULL, 32))

Definition at line 28 of file preproc.h.

#define _BITCOUNT2

(

x

)

(_BITCOUNTx(_BITCOUNT3(x), 0x0000ffff0000ffffULL, 16))

Definition at line 27 of file preproc.h.

#define _BITCOUNT3

(

x

)

(_BITCOUNTx(_BITCOUNT4(x), 0x00ff00ff00ff00ffULL, 8))

Definition at line 26 of file preproc.h.

#define _BITCOUNT4

(

x

)

(_BITCOUNTx(_BITCOUNT5(x), 0x0f0f0f0f0f0f0f0fULL, 4))

Definition at line 25 of file preproc.h.

#define _BITCOUNT5

(

x

)

(_BITCOUNTx(_BITCOUNT6(x), 0x3333333333333333ULL, 2))

Definition at line 24 of file preproc.h.

#define _BITCOUNT6

(

x

)

(_BITCOUNTx( (x), 0x5555555555555555ULL, 1))

Definition at line 23 of file preproc.h.

#define _BITCOUNTx	(	x,
		m,
		s		)	( ((x) & m) + (((x) & (m << s)) >> s) )

Macros for counting the bits set.

The interested party is referred to "<i>Numerical Recipes</i>".

Definition at line 22 of file preproc.h.

#define MODE_T_SHIFT_BITS   (_BITCOUNT(S_IFMT ^ (S_IFMT-1)) -1)

How many bits a mode_t must be shifted to get the packed representation.

Definition at line 36 of file preproc.h.

#define MODE_T_to_PACKED

(

mode

)

((mode) >> MODE_T_SHIFT_BITS)

How to convert from mode_t to the packed representation (in struct estat) and back.

Definition at line 45 of file preproc.h.

Referenced by cb__add_entry(), dir__enumerator(), ops__load_1entry(), ops__string_to_dev(), ops__update_single_entry(), rev__install_file(), and up__parse_prop().

#define PACKED_MODE_T_NEEDED_BITS   (_BITCOUNT(S_IFMT))

The number of bits needed for storage.

Definition at line 39 of file preproc.h.

#define PACKED_to_MODE_T

(

p

)

((p) << MODE_T_SHIFT_BITS)

Definition at line 46 of file preproc.h.

Referenced by cb__add_entry(), DEBUGP_dump_estat(), df___diff_wc_remote(), sync__progress(), up__handle_special(), up__parse_prop(), up__set_meta_data(), and waa__update_tree().

#define TEST_PACKED	(	test,
		val		)	test(PACKED_to_MODE_T(val))

Simplification for testing packed modes.

Used with S_ISDIR etc.

Definition at line 50 of file preproc.h.

Referenced by rev___undo_change(), up__parse_prop(), waa___finish_directory(), waa___recurse_tree(), and waa__update_tree().