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.\" Copyright © 2002 - Philip Howard - All rights reserved
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.\" Lesser General Public License for more details.
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.TH vrb_data_len 3 2002-09-30 vrb "VRB Programmer's Manual"
.SH NAME
vrb_data_len - return the length of data
.SH LIBRARY
.B -lvrb
.SH SYNOPSIS
.B #include <vrb.h>
.sp
.IB "size_t " "vrb_data_len" "(vrb_p " "vrb" ");"
.SH DESCRIPTION
.B vrb_data_len
returns the total length of data presently in the given
virtual ring buffer.
.SH ARGUMENTS
.IB "vrb_p " vrb
.br
specifies the virtual ring buffer to obtain the data length of.
If a NULL or invalid pointer is given, results are unpredictable
and are likely to be disasterous.
.SH "RETURN VALUE"
.I size_t
.br
The total data length of the virtual ring buffer is returned.
.SH "SEE ALSO"
.BR vrb (3),
.BR vrb_capacity (3),
.BR vrb_data_ptr (3),
.BR vrb_destroy (3),
.BR vrb_get (3),
.BR vrb_get_min (3),
.BR vrb_give (3),
.BR vrb_init (3),
.BR vrb_init_opt (3),
.BR vrb_is_empty (3),
.BR vrb_is_full (3),
.BR vrb_is_not_empty (3),
.BR vrb_is_not_full (3),
.BR vrb_move (3),
.BR vrb_new (3),
.BR vrb_new_opt (3),
.BR vrb_put (3),
.BR vrb_put_all (3),
.BR vrb_read (3),
.BR vrb_read_min (3),
.BR vrb_resize (3),
.BR vrb_space_len (3),
.BR vrb_space_ptr (3),
.BR vrb_take (3),
.BR vrb_uninit (3),
.BR vrb_write (3),
.BR vrb_write_min (3)