NAME
       vrb_space_len - return the length of space
LIBRARY
       -lvrb
SYNOPSIS
       #include <vrb.h>
       size_t vrb_space_len(vrb_p vrb);
DESCRIPTION
       vrb_space_len  returns the total length of space available in the given
       virtual ring buffer.  This is the maximum space the  caller  may  store
       into the buffer from the pointer returned by vrb_space_ptr(3).
ARGUMENTS
       vrb_p vrb
       specifies  the  virtual  ring  buffer to obtain the length of available
       space in.   If  a  NULL  or  invalid  pointer  is  given,  results  are
       unpredictable and are likely to be disasterous.
RETURN VALUE
       size_t
       The length of available space in the virtual ring buffer is returned.
SEE ALSO
       vrb(3),      vrb_capacity(3),     vrb_data_len(3),     vrb_data_ptr(3),
       vrb_destroy(3), vrb_get(3), vrb_get_min(3),  vrb_give(3),  vrb_init(3),
       vrb_init_opt(3),  vrb_is_empty(3), vrb_is_full(3), vrb_is_not_empty(3),
       vrb_is_not_full(3),    vrb_move(3),     vrb_new(3),     vrb_new_opt(3),
       vrb_put(3),      vrb_put_all(3),      vrb_read(3),     vrb_read_min(3),
       vrb_resize(3),    vrb_space_ptr(3),     vrb_take(3),     vrb_uninit(3),
       vrb_write(3), vrb_write_min(3)