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fwide(3) [redhat man page]

FWIDE(3)						     Linux Programmer's Manual							  FWIDE(3)

NAME
fwide - set and determine the orientation of a FILE stream SYNOPSIS
#include <wchar.h> int fwide(FILE *stream, int mode); DESCRIPTION
When mode is zero, the fwide function determines the current orientation of stream. It returns a value > 0 if stream is wide-character ori- ented, i.e. if wide character I/O is permitted but char I/O is disallowed. It returns a value < 0 if stream is byte oriented, i.e. 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 opera- tion 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 non-zero, the fwide function first attempts to set stream'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. RETURN VALUE
The fwide function returns the stream's orientation, after possibly changing it. A return value > 0 means wide-character oriented. A return value < 0 means byte oriented. A return value zero means undecided. CONFORMING TO
ISO/ANSI C, UNIX98 SEE ALSO
fprintf(3), fwprintf(3) NOTES
Wide-character output to a byte oriented stream can be performed through the fprintf function with the %lc and %ls directives. Char oriented output to a wide-character oriented stream can be performed through the fwprintf function with the %c and %s directives. GNU
1999-11-17 FWIDE(3)

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FWIDE(3)						     Linux Programmer's Manual							  FWIDE(3)

NAME
fwide - set and determine the orientation of a FILE stream SYNOPSIS
#include <wchar.h> int fwide(FILE *stream, int mode); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): fwide(): _XOPEN_SOURCE >= 500 || _ISOC99_SOURCE || _ISOC95_SOURCE /* Since glibc 2.12 */ || _POSIX_C_SOURCE >= 200112L; or cc -std=c99 DESCRIPTION
When mode is zero, the fwide() function determines the current orientation of stream. It returns a positive value if stream is wide-char- acter 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 ori- ented, i.e., 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'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'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. CONFORMING TO
C99, POSIX.1-2001. 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. SEE ALSO
fprintf(3), fwprintf(3) COLOPHON
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. GNU
2011-09-17 FWIDE(3)

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