2004-07-16 06:06:09 +00:00
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.\" Copyright (c) 1990, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" are met:
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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2017-02-28 23:42:47 +00:00
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.\" 3. Neither the name of the University nor the names of its contributors
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2004-07-16 06:06:09 +00:00
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)fgetln.3 8.3 (Berkeley) 4/19/94
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.\"
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.Dd July 16, 2004
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.Dt FGETWLN 3
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.Os
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.Sh NAME
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2005-09-18 15:40:03 +00:00
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.Nm fgetwln
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2004-07-16 06:06:09 +00:00
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.Nd get a line of wide characters from a stream
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In stdio.h
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.In wchar.h
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.Ft wchar_t *
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.Fn fgetwln "FILE * restrict stream" "size_t * restrict len"
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.Sh DESCRIPTION
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The
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.Fn fgetwln
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function
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returns a pointer to the next line from the stream referenced by
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.Fa stream .
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This line is
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.Em not
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a standard wide character string as it does not end with a terminating
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null wide character.
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The length of the line, including the final newline,
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is stored in the memory location to which
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.Fa len
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points.
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(Note, however, that if the line is the last
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in a file that does not end in a newline,
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the returned text will not contain a newline.)
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.Sh RETURN VALUES
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Upon successful completion a pointer is returned;
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this pointer becomes invalid after the next
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.Tn I/O
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operation on
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.Fa stream
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(whether successful or not)
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or as soon as the stream is closed.
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Otherwise,
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.Dv NULL
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is returned.
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The
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.Fn fgetwln
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function
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does not distinguish between end-of-file and error; the routines
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.Xr feof 3
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and
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.Xr ferror 3
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must be used
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to determine which occurred.
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If an error occurs, the global variable
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.Va errno
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is set to indicate the error.
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The end-of-file condition is remembered, even on a terminal, and all
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subsequent attempts to read will return
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.Dv NULL
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until the condition is
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cleared with
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.Xr clearerr 3 .
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.Pp
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The text to which the returned pointer points may be modified,
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provided that no changes are made beyond the returned size.
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These changes are lost as soon as the pointer becomes invalid.
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.Sh ERRORS
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.Bl -tag -width Er
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.It Bq Er EBADF
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The argument
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.Fa stream
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is not a stream open for reading.
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.El
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.Pp
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The
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.Fn fgetwln
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function
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may also fail and set
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.Va errno
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for any of the errors specified for the routines
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.Xr mbrtowc 3 ,
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.Xr realloc 3 ,
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or
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.Xr read 2 .
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.Sh SEE ALSO
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.Xr ferror 3 ,
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.Xr fgetln 3 ,
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.Xr fgetws 3 ,
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.Xr fopen 3
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