The function can make a write position available only if

To make a write position available,

the function reallocates (or initially allocates) an array object

with a sufficient number of elements to hold

the current array object (if any), plus

at least

one additional write position.

the function alters the read end pointer

\tcode{egptr()}

to point just past the new write position.

\begin{libtab2}{\tcode{seekoff} positioning}{stringbuf.seekoff.pos}

{p{2.5in}l}{Conditions}{Result}

positions the input sequence \\ \rowsep

positions the output sequence \\ \rowsep

\tcode{way == ios_base::beg} or\br

\tcode{way == ios_base::end} &

positions both the input and the output sequences \\ \rowsep

If the open operation succeeds and

positions the file to the end

(as if by calling \tcode{fseek(file, 0, SEEK_END)}, where

\tcode{file} is the pointer returned by calling \tcode{fopen}).%