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 || _POSIX_C_SOURCE >= 200112L; or cc -std=c99 DESCRIPTION When mode is zero, the fwide() function determines the current orienta- tion of stream. It returns a positive value if stream is wide-charac- ter 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--that is, if char I/O is permitted but wide-character I/O is dis- allowed. It returns zero if stream has no orientation yet; in this case the next I/O operation might change the orientation (to byte ori- ented 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 per- formed through the fwprintf(3) function with the %c and %s directives. SEE ALSO fprintf(3), fwprintf(3) COLOPHON This page is part of release 3.74 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/. GNU 2014-03-19 FWIDE(3)
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