Section (3) fwide
Name
fwide — set and determine the orientation of a FILE stream
Synopsis
#include <wchar.h>
int
fwide( |
FILE *stream, |
int mode) ; |
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DESCRIPTION
When mode
is zero,
the fwide
() function determines
the current orientation of stream
. It returns a positive
value if stream
is
wide-character oriented, that is, if wide-character I/O is
permitted but char I/O is disallowed. It returns a negative
value if stream
is
byte oriented—that is, if char I/O is permitted but
wide-character I/O is disallowed. It returns zero if
stream
has no
orientation yet; in this case the next I/O operation might
change the orientation (to byte oriented if it is a char I/O
operation, or to wide-character oriented if it is a
wide-character I/O operation).
Once a stream has an orientation, it cannot be changed and persists until the stream is closed.
When mode
is
nonzero, the fwide
() function
first attempts to set stream
_zsingle_quotesz_s orientation (to
wide-character oriented if mode
is greater than 0, or to
byte oriented if mode
is less than 0). It then returns a value denoting the current
orientation, as above.
RETURN VALUE
The fwide
() function returns
the stream_zsingle_quotesz_s orientation, after possibly changing it. A
positive return value means wide-character oriented. A
negative return value means byte oriented. A return value of
zero means undecided.
NOTES
Wide-character output to a byte oriented stream can be
performed through the fprintf(3) function with
the %lc
and
%ls
directives.
Char oriented output to a wide-character oriented stream
can be performed through the fwprintf(3) function with
the %c
and
%s
directives.
COLOPHON
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Copyright (c) Bruno Haible <haibleclisp.cons.org> %%%LICENSE_START(GPLv2+_DOC_ONEPARA) This is free documentation; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. %%%LICENSE_END References consulted: GNU glibc-2 source code and manual Dinkumware C library reference http://www.dinkumware.com/ OpenGroup_zsingle_quotesz_s Single UNIX specification http://www.UNIX-systems.org/online.html ISO/IEC 9899:1999 |