include: Add a lookup table of sizes

Adding a lookup table for the powers of two, with the appropriate size
prefixes. This is needed when a size has to be stringified, in which
case something like '(1 * KiB)' would become a literal '(1 * (1L << 10))'
string. Powers of two are used very often for sizes, so such a table
will also make it easier and more intuitive to write them.

This table is generatred using the following AWK script:

BEGIN {
	suffix="KMGTPE";
	for(i=10; i<64; i++) {
		val=2**i;
		s=substr(suffix, int(i/10), 1);
		n=2**(i%10);
		pad=21-int(log(n)/log(10));
		printf("#define S_%d%siB %*d\n", n, s, pad, val);
	}
}

Signed-off-by: Leonid Bloch <lbloch@janustech.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Leonid Bloch 2018-09-26 19:04:40 +03:00 committed by Kevin Wolf
parent 40fb215d48
commit 540b849261
1 changed files with 55 additions and 0 deletions

View File

@ -17,4 +17,59 @@
#define PiB (INT64_C(1) << 50)
#define EiB (INT64_C(1) << 60)
#define S_1KiB 1024
#define S_2KiB 2048
#define S_4KiB 4096
#define S_8KiB 8192
#define S_16KiB 16384
#define S_32KiB 32768
#define S_64KiB 65536
#define S_128KiB 131072
#define S_256KiB 262144
#define S_512KiB 524288
#define S_1MiB 1048576
#define S_2MiB 2097152
#define S_4MiB 4194304
#define S_8MiB 8388608
#define S_16MiB 16777216
#define S_32MiB 33554432
#define S_64MiB 67108864
#define S_128MiB 134217728
#define S_256MiB 268435456
#define S_512MiB 536870912
#define S_1GiB 1073741824
#define S_2GiB 2147483648
#define S_4GiB 4294967296
#define S_8GiB 8589934592
#define S_16GiB 17179869184
#define S_32GiB 34359738368
#define S_64GiB 68719476736
#define S_128GiB 137438953472
#define S_256GiB 274877906944
#define S_512GiB 549755813888
#define S_1TiB 1099511627776
#define S_2TiB 2199023255552
#define S_4TiB 4398046511104
#define S_8TiB 8796093022208
#define S_16TiB 17592186044416
#define S_32TiB 35184372088832
#define S_64TiB 70368744177664
#define S_128TiB 140737488355328
#define S_256TiB 281474976710656
#define S_512TiB 562949953421312
#define S_1PiB 1125899906842624
#define S_2PiB 2251799813685248
#define S_4PiB 4503599627370496
#define S_8PiB 9007199254740992
#define S_16PiB 18014398509481984
#define S_32PiB 36028797018963968
#define S_64PiB 72057594037927936
#define S_128PiB 144115188075855872
#define S_256PiB 288230376151711744
#define S_512PiB 576460752303423488
#define S_1EiB 1152921504606846976
#define S_2EiB 2305843009213693952
#define S_4EiB 4611686018427387904
#define S_8EiB 9223372036854775808
#endif