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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [stdio/] [fwide.c] - Rev 262
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/* FUNCTION <<fwide>>---set and determine the orientation of a FILE stream INDEX fwide INDEX _fwide_r ANSI_SYNOPSIS #include <wchar.h> int fwide(FILE *<[fp]>, int <[mode]>) int _fwide_r(struct _reent *<[ptr]>, FILE *<[fp]>, int <[mode]>) TRAD_SYNOPSIS #include <wchar.h> int fwide(<[fp]>, <[mode]>) FILE *<[fp]>; int <[mode]>; int _fwide_r(<[ptr]>, <[fp]>, <[mode]>) struct _reent *<[ptr]>; FILE *<[fp]>; int <[mode]>; DESCRIPTION When <[mode]> is zero, the <<fwide>> function determines the current orientation of <[fp]>. It returns a value > 0 if <[fp]> is wide-character oriented, i.e. if wide character I/O is permitted but char I/O is disallowed. It returns a value < 0 if <[fp]> is byte oriented, i.e. if char I/O is permitted but wide character I/O is disallowed. It returns zero if <[fp]> 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, unless the stream is re-opened with freopen, which removes the orientation of the stream. When <[mode]> is non-zero, the <<fwide>> function first attempts to set <[fp]>'s orientation (to wide-character oriented if <[mode]> > 0, or to byte oriented if <[mode]> < 0). It then returns a value denoting the current orientation, as above. RETURNS The <<fwide>> function returns <[fp]>'s orientation, after possibly changing it. A return value > 0 means wide-character oriented. A return value < 0 means byte oriented. A return value of zero means undecided. PORTABILITY C99, POSIX.1-2001. */ #include <_ansi.h> #include <wchar.h> #include "local.h" int _DEFUN(_fwide_r, (ptr, fp, mode), struct _reent *ptr _AND FILE *fp _AND int mode) { int ret; CHECK_INIT(ptr, fp); _flockfile (fp); if (mode != 0) { ORIENT (fp, mode); } if (!(fp->_flags & __SORD)) ret = 0; else ret = (fp->_flags2 & __SWID) ? 1 : -1; _funlockfile (fp); return ret; } int _DEFUN(fwide, (fp, mode), FILE *fp _AND int mode) { return _fwide_r (_REENT, fp, mode); }
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