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In the event of any discrepancy .\" between these versions and the original IEEE and The Open Group .\" Standard, the original IEEE and The Open Group Standard is the referee .\" document. 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All Rights Reserved. .\" Portions Copyright (c) 2002, Sun Microsystems, Inc. All Rights Reserved. .\" .TH FPUTWC 3C "March 25, 2020" .SH NAME fputwc, putwc, putwchar \- put wide-character code on a stream .SH SYNOPSIS .nf #include #include \fBwint_t\fR \fBfputwc\fR(\fBwchar_t\fR \fIwc\fR, \fBFILE*\fR\fIstream\fR); .fi .LP .nf \fBwint_t\fR \fBputwc\fR(\fBwchar_t\fR \fIwc\fR, \fBFILE*\fR\fIstream\fR); .fi .LP .nf #include \fBwint_t\fR \fBputwchar\fR(\fBwchar_t\fR \fIwc\fR); .fi .SH DESCRIPTION The \fBfputwc()\fR function writes the character corresponding to the wide-character code \fIwc\fR to the output stream pointed to by \fIstream\fR, at the position indicated by the associated file-position indicator for the stream (if defined), and advances the indicator appropriately. If the file cannot support positioning requests, or if the stream was opened with append mode, the character is appended to the output stream. If an error occurs while writing the character, the shift state of the output file is left in an undefined state. .sp .LP The \fBst_ctime\fR and \fBst_mtime\fR fields of the file will be marked for update between the successful execution of \fBfputwc()\fR and the next successful completion of a call to \fBfflush\fR(3C) or \fBfclose\fR(3C) on the same stream or a call to \fBexit\fR(2) or \fBabort\fR(3C). .sp .LP The \fBputwc()\fR function is equivalent to \fBfputwc()\fR, except that it is implemented as a macro. .sp .LP The call \fBputwchar(\fR\fIwc\fR\fB)\fR is equivalent to \fBputwc(\fR\fIwc,\fR\fB stdout)\fR\fI\&.\fR The \fBputwchar()\fR routine is implemented as a macro. .SH RETURN VALUES Upon successful completion, \fBfputwc()\fR, \fBputwc()\fR, and \fBputwchar()\fR return \fIwc\fR. Otherwise, they return \fBWEOF\fR, the error indicator for the stream is set, and \fBerrno\fR is set to indicate the error. .SH ERRORS The \fBfputwc()\fR, \fBputwc()\fR, and \fBputwchar()\fR functions will fail if either the stream is unbuffered or data in the \fIstream\fR's buffer needs to be written, and: .sp .ne 2 .na \fB\fBEAGAIN\fR\fR .ad .RS 10n The \fBO_NONBLOCK\fR flag is set for the file descriptor underlying \fIstream\fR and the process would be delayed in the write operation. .RE .sp .ne 2 .na \fB\fBEBADF\fR\fR .ad .RS 10n The file descriptor underlying \fIstream\fR is not a valid file descriptor open for writing. .RE .sp .ne 2 .na \fB\fBEFBIG\fR\fR .ad .RS 10n An attempt was made to write to a file that exceeds the maximum file size or the process's file size limit; or the file is a regular file and an attempt was made to write at or beyond the offset maximum associated with the corresponding stream. .RE .sp .ne 2 .na \fB\fBEINTR\fR\fR .ad .RS 10n The write operation was terminated due to the receipt of a signal, and no data was transferred. .RE .sp .ne 2 .na \fB\fBEIO\fR\fR .ad .RS 10n A physical I/O error has occurred, or the process is a member of a background process group attempting to write to its controlling terminal, \fBTOSTOP\fR is set, the process is neither ignoring nor blocking \fBSIGTTOU\fR, and the process group of the process is orphaned. \fIstream\fR was created by \fBopen_wmemstream\fR(3C) and a wide-character or byte sequence buffered is invalid in the current locale. .RE .sp .ne 2 .na \fB\fBENOSPC\fR\fR .ad .RS 10n There was no free space remaining on the device containing the file. .RE .sp .ne 2 .na \fB\fBEPIPE\fR\fR .ad .RS 10n An attempt is made to write to a pipe or \fBFIFO\fR that is not open for reading by any process. A \fBSIGPIPE\fR signal will also be sent to the calling thread. .RE .sp .LP The \fBfputwc()\fR, \fBputwc()\fR, and \fBputwchar()\fR functions may fail if: .sp .ne 2 .na \fB\fBENOMEM\fR\fR .ad .RS 10n Insufficient storage space is available. .RE .sp .ne 2 .na \fB\fBENXIO\fR\fR .ad .RS 10n A request was made of a non-existent device, or the request was outside the capabilities of the device. .RE .sp .ne 2 .na \fB\fBEILSEQ\fR\fR .ad .RS 10n The wide-character code \fIwc\fR does not correspond to a valid character. .RE .SH USAGE Functions exist for the \fBputwc()\fR and \fBputwchar()\fR macros. To get the function form, the macro name must be undefined (for example, \fB#undef putc\fR). .sp .LP When the macro form is used, \fBputwc()\fR evaluates the \fIstream\fR argument more than once. In particular, \fBputwc(\fR\fIwc\fR\fB, \fR\fI*f++\fR\fB)\fR does not work sensibly. The \fBfputwc()\fR function should be used instead when evaluating the \fIstream\fR argument has side effects. .SH ATTRIBUTES See \fBattributes\fR(5) for descriptions of the following attributes: .sp .sp .TS box; l | l l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE _ Interface Stability Standard _ MT-Level MT-Safe .TE .SH SEE ALSO \fBexit\fR(2), \fBulimit\fR(2), \fBabort\fR(3C), \fBfclose\fR(3C), \fBferror\fR(3C), \fBfflush\fR(3C), \fBfopen\fR(3C), \fBsetbuf\fR(3C), \fBattributes\fR(5), \fBstandards\fR(5)