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FreeBSD 11.0 - man page for open_wmemstream (freebsd section 3)

OPEN_MEMSTREAM(3)					   BSD Library Functions Manual 					 OPEN_MEMSTREAM(3)

open_memstream, open_wmemstream -- dynamic memory buffer stream open functions
Standard C Library (libc, -lc)
#include <stdio.h> FILE * open_memstream(char **bufp, size_t *sizep); #include <wchar.h> FILE * open_wmemstream(wchar_t **bufp, size_t *sizep);
The open_memstream() and open_wmemstream() functions create a write-only, seekable stream backed by a dynamically allocated memory buffer. The open_memstream() function creates a byte-oriented stream, while the open_wmemstream() function creates a wide-oriented stream. Each stream maintains a current position and size. Initially, the position and size are set to zero. Each write begins at the current posi- tion and advances it the number of successfully written bytes for open_memstream() or wide characters for 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 buf- fer. A stream's buffer always contains a null character at the end of the buffer that is not included in the current length. 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. After a successful call to fclose(3) or fflush(3), the pointer referenced by bufp will contain the start of the memory buffer and the vari- able referenced by sizep will contain the smaller of the current position and the current buffer length. After a successful call to fflush(3,) the pointer referenced by bufp and the variable referenced by sizep are only valid until the next write operation or a call to fclose(3.) Once a stream is closed, the allocated buffer referenced by bufp should be released via a call to free(3) when it is no longer needed.
Internally all I/O streams are effectively byte-oriented, so using wide-oriented operations to write to a stream opened via 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.
Upon successful completion, open_memstream() and open_wmemstream() return a FILE pointer. Otherwise, NULL is returned and the global vari- able errno is set to indicate the error.
[EINVAL] The bufp or sizep argument was NULL. [ENOMEM] Memory for the stream or buffer could not be allocated.
fclose(3), fflush(3), fopen(3), free(3), fseek(3), sbuf(3), stdio(3)
The open_memstream() and open_wmemstream() functions conform to IEEE Std 1003.1-2008 (``POSIX.1'').
October 28, 2014 BSD

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