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-.\" Copyright (c) 2013 Hudson River Trading LLC
-.\" Written by: John H. Baldwin <jhb@FreeBSD.org>
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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-.\" $FreeBSD$
-.\"
-.Dd August 1, 2015
-.Dt OPEN_MEMSTREAM 3
-.Os
-.Sh NAME
-.Nm open_memstream ,
-.Nm open_wmemstream
-.Nd dynamic memory buffer stream open functions
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In stdio.h
-.Ft FILE *
-.Fn open_memstream "char **bufp" "size_t *sizep"
-.In wchar.h
-.Ft FILE *
-.Fn open_wmemstream "wchar_t **bufp" "size_t *sizep"
-.Sh DESCRIPTION
-The
-.Fn open_memstream
-and
-.Fn open_wmemstream
-functions create a write-only, seekable stream backed by a dynamically
-allocated memory buffer.
-The
-.Fn open_memstream
-function creates a byte-oriented stream,
-while the
-.Fn open_wmemstream
-function creates a wide-oriented stream.
-.Pp
-Each stream maintains a current position and size.
-Initially,
-the position and size are set to zero.
-Each write begins at the current position and advances it the number of
-successfully written bytes for
-.Fn open_memstream
-or wide characters for
-.Fn open_wmemstream .
-If a write moves the current position beyond the length of the buffer,
-the length of the buffer is extended and a null character is appended to the
-buffer.
-.Pp
-A stream's buffer always contains a null character at the end of the buffer
-that is not included in the current length.
-.Pp
-If a stream's current position is moved beyond the current length via a
-seek operation and a write is performed,
-the characters between the current length and the current position are filled
-with null characters before the write is performed.
-.Pp
-After a successful call to
-.Xr fclose 3
-or
-.Xr fflush 3 ,
-the pointer referenced by
-.Fa bufp
-will contain the start of the memory buffer and the variable referenced by
-.Fa sizep
-will contain the smaller of the current position and the current buffer length.
-.Pp
-After a successful call to
-.Xr fflush 3 ,
-the pointer referenced by
-.Fa bufp
-and the variable referenced by
-.Fa sizep
-are only valid until the next write operation or a call to
-.Xr fclose 3 .
-.Pp
-Once a stream is closed,
-the allocated buffer referenced by
-.Fa bufp
-should be released via a call to
-.Xr free 3
-when it is no longer needed.
-.Sh IMPLEMENTATION NOTES
-Internally all I/O streams are effectively byte-oriented,
-so using wide-oriented operations to write to a stream opened via
-.Fn open_wmemstream
-results in wide characters being expanded to a stream of multibyte characters
-in stdio's internal buffers.
-These multibyte characters are then converted back to wide characters when
-written into the stream.
-As a result,
-the wide-oriented streams maintain an internal multibyte character conversion
-state that is cleared on any seek opertion that changes the current position.
-This should have no effect as long as wide-oriented output operations are used
-on a wide-oriented stream.
-.Sh RETURN VALUES
-Upon successful completion,
-.Fn open_memstream
-and
-.Fn open_wmemstream
-return a
-.Tn FILE
-pointer.
-Otherwise,
-.Dv NULL
-is returned and the global variable
-.Va errno
-is set to indicate the error.
-.Sh ERRORS
-.Bl -tag -width Er
-.It Bq Er EINVAL
-The
-.Fa bufp
-or
-.Fa sizep
-argument was
-.Dv NULL .
-.It Bq Er ENOMEM
-Memory for the stream or buffer could not be allocated.
-.El
-.Sh SEE ALSO
-.Xr fclose 3 ,
-.Xr fflush 3 ,
-.Xr fopen 3 ,
-.Xr free 3 ,
-.Xr fseek 3 ,
-.Xr stdio 3 ,
-.Xr sbuf 9
-.Sh STANDARDS
-The
-.Fn open_memstream
-and
-.Fn open_wmemstream
-functions conform to
-.St -p1003.1-2008 .