'\" t
.\"     Title: bitmap_ord_to_pos
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: May 2018
.\"    Manual: Basic Kernel Library Functions
.\"    Source: Kernel Hackers Manual 3.16.56
.\"  Language: English
.\"
.TH "BITMAP_ORD_TO_POS" "9" "May 2018" "Kernel Hackers Manual 3\&.16\&" "Basic Kernel Library Functions"
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.SH "NAME"
bitmap_ord_to_pos \- find position of n\-th set bit in bitmap
.SH "SYNOPSIS"
.HP \w'int\ bitmap_ord_to_pos('u
.BI "int bitmap_ord_to_pos(const\ unsigned\ long\ *\ " "buf" ", int\ " "ord" ", int\ " "bits" ");"
.SH "ARGUMENTS"
.PP
\fIbuf\fR
.RS 4
pointer to bitmap
.RE
.PP
\fIord\fR
.RS 4
ordinal bit position (n\-th set bit, n >= 0)
.RE
.PP
\fIbits\fR
.RS 4
number of valid bit positions in
\fIbuf\fR
.RE
.SH "DESCRIPTION"
.PP
Map the ordinal offset of bit
\fIord\fR
in
\fIbuf\fR
to its position in
\fIbuf\fR\&. Value of
\fIord\fR
should be in range 0 <=
\fIord\fR
< weight(buf), else results are undefined\&.
.PP
If for example, just bits 4 through 7 are set in
\fIbuf\fR, then
\fIord\fR
values 0 through 3 will get mapped to 4 through 7, respectively, and all other
\fIord\fR
values return undefined values\&. When
\fIord\fR
value 3 gets mapped to (returns)
\fIpos\fR
value 7 in this example, that means that the 3rd set bit (starting with 0th) is at position 7 in
\fIbuf\fR\&.
.PP
The bit positions 0 through
\fIbits\fR
are valid positions in
\fIbuf\fR\&.
.SH "COPYRIGHT"
.br