fwide - Sets stream orientation to byte or wide-character
Standard C Library (libc.so, libc.a)
#include <stdarg.h> #include <wchar.h>
Interfaces documented on this reference page conform to industry standards as follows:
fwide(): ISO C
Refer to the standards(5) reference page for more information about industry standards and associated tags.
Points to a FILE structure specifying an open stream Specifies an integer that determines the orientation of the stream. If the integer is greater than zero, the function attempts to make the stream wide-character oriented. If the integer is less than zero, the function attempts to make the stream byte oriented. If the integer is zero, the function does not attempt to alter the stream orientation.
The fwide() function, depending on the value of the mode parameter, sets or queries the orientation of a stream of data specified by a FILE structure.
If the stream has no orientation, a positive or negative mode value causes the function to change the stream orientation to wide character or byte, respectively. The function does not change stream orientation when it is already set. When the stream orientation is already set, the application must first call freopen() to reinitialize the stream and then call fwide() to reset the stream orientation.
A mode value of zero causes the function to return the current stream orientation without attempting to change it.
The fwide() function returns an integer value to indicate the stream orientation after the call. The function returns a value greater than zero if the stream orientation is wide-character, a value less than zero if the stream orientation is byte, and 0 (zero) if the stream has no orientation. On error, the function returns 0 (zero) and sets errno to indicate the condition.
The file descriptor associated with stream is invalid.
Functions: fopen(3) delim off