.\"
.\" $Id: bytes_by_prefix.3,v 1.1 2000/07/27 16:59:03 alaffin Exp $
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.TH BYTES_BY_PREFIX 3 07/25/2000 "Linux Test Project"
.SH NAME
bytes_by_prefix \- convert a string to a int byte count
lbytes_by_prefix \- convert a string to a long byte count
llbytes_by_prefix \- convert a string to a long long byte count
.SH SYNOPSIS
int bytes_by_prefix(char *\fIstr\fR);
.br
long lbytes_by_prefix(char *\fIstr\fR);
.br
long long llbytes_by_prefix(char *\fIstr\fR);
.SH DESCRIPTION
\fBbytes_by_prefix()\fR, \fBlbytes_by_prefix()\fR, and \fBllbytes_by_prefix()\fR converts
\fIstr\fR to an integer, long, or long long  byte count.  \fIstr\fR is an
floating point number optionally followed by a single character multiplier.
Currently the following multipliers are supported:
.sp
.nf
    Char  Meaning       Multiplier
    ----  ---------     --------------------------------
    b     Blocks        BSIZE or UBSIZE
    k     Kilobytes     2^10 (1024)
    K     Kilowords     2^10 (1024) * sizeof(long)
    m     Megabytes     2^20 (1048576)
    M     Megawords     2^20 (1048576) * sizeof(long)
    g     Gigabytes     2^30 (1073741824)
    G     Gigawords     2^30 (1073741824) * sizeof(long)
.fi
.sp
\fIstr\fR is interpreted as floating point number (base 10).
When using \fBllbytes_by_prefix()\fR, the uppercase suffix will result
in multiplying by the size of a (long long) or 8.
.SH RETURNS
-1 if the integer portion of \fIstr\fR is invalid, if an unsupported
multiplier is supplied, or if \fIstr\fR has extra leading or trailing
characters.  If \fIstr\fR contains a negative number, the return
value will be negative.
.SH EXAMPLES
\fBbytes_by_prefix("1000")\fR
.br
.RS 8
Returns 1000
.RE
.br
\fBbytes_by_prefix("5b")\fR
.br
.RS 8
Returns 5 * BSIZE.
.RE
\fBbytes_by_prefix("1.5m")\fR
.br
.RS 8
Returns 1.5 * 1048576 or 1572864
.RE

.SH LIMITATIONS

\fBbytes_by_prefix()\fR and \fBlbytes_by_prefix()\fR when compiled as
a 32 bit IRIX binary can only return a max number of 2g (2147483647).
However, \fBlbytes_by_prefix()\fR is not limited by the 2g limit when
compiled as 64 bit binary, where \fBbytes_by_prefix()\fR still is limited.

Note that the size of long will vary depending how if compiled as
a 32 or 64 bit binary.  The size of a long long is always 8.

Also note that on a traditional CRAY system, a block is 4096 bytes, where
on most IRIX systems a block is 1024 bytes.