02-16-2017
Not so weird if you read the man page meticulously.
man find:
Quote:
-size n[cwbkMG]
File uses n units of space, rounding up.
.
.
.
The + and - prefixes signify greater than and less than, as usual. Bear in mind that the size is rounded up to the next unit. Therefore -size -1M is not equivalent to -size -1048576c. The former only matches empty files, the latter matches files from 1 to 1,048,575 bytes.
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LEARN ABOUT NETBSD
powerof2
ROUNDUP(9) BSD Kernel Developer's Manual ROUNDUP(9)
NAME
roundup -- macros for counting and rounding
SYNOPSIS
#include <sys/param.h>
size
howmany(x, size);
size
roundup(x, size);
size
rounddown(x, size);
size
roundup2(x, size);
int
powerof2(x);
DESCRIPTION
The roundup() and rounddown() macros return an integer from rounding x up and down, respectively, to the next size. The howmany() macro in
turn reveals how many times size fits into x, rounding the residual up.
The roundup2() macro also rounds up, but with the assumption that size is a power of two. If x is indeed a power of two, powerof2() return
1.
RETURN VALUES
The return value is an integer from the respective operation. If x is 0, all macros except powerof2() return 0. The behavior is undefined
if size is 0.
EXAMPLES
The following example rounds the variable rx to a 32-bit boundary:
uint16_t rx;
...
rx = roundup2(rx, sizeof(uint32_t));
SEE ALSO
ilog2(3), param(3), imax(9)
CAVEATS
All described macros make no assumptions about the type of the parameters. These are implicitly assumed to be unsigned integers.
BSD
June 1, 2011 BSD