Index for Section 3

Alphabetical listing for P

putwc(3)
NAME
  putwc, putwchar, fputwc - Write a wide character to a stream

LIBRARY
  Standard C Library (libc.so, libc.a)

SYNOPSIS
  #include <wchar.h>

  wint_t putwc(
	  wint_t wc,
	  FILE *stream);

  wint_t putwchar(
	  wchar_t wc );

  wint_t fputwc(
	  wint_t wc,
	  FILE *stream);

  For the fputwc() and putwc() functions, application developers may want to
  specify an #include statement for <stdio.h> before the one for <wchar.h> if
  programs are being developed for multiple platforms. The additional
  #include statement is not required on Tru64 UNIX systems or by ISO or
  X/Open standards, but may be required on other vendors' systems that
  conform to these standards.  For the putwchar() function, the XPG4 standard
  specifies the parameter type wint_t rather than wchar_t, which is required
  by the current version of the ISO C standard. On Tru64 UNIX systems, both
  types resolve to int; however, wchar_t and wint_t may not be equivalent
  types on other systems that conform to these standards.

STANDARDS
  Interfaces documented on this reference page conform to industry standards
  as follows:

  fputwc(), putwc(), putwchar():  XPG4, XPG4-UNIX

  Refer to the standards(5) reference page for more information about
  industry standards and associated tags.

PARAMETERS
  wc  Specifies the wide character to be converted and written.

  stream
      Points to the output data.



DESCRIPTION
  The fputwc() function converts the wchar_t specified by the wc parameter to
  its equivalent multibyte character and then writes the multibyte character
  to the file or terminal associated with the stream parameter. The function
  also advances the file position indicator for stream if the associated file
  supports positioning requests.  If the file does not support positioning
  requests or was opened in append mode, the function appends the character
  to the end of stream.	 The st_ctime and st_mtime fields of the FILE
  structure are marked for update between a successful execution of fputwc()
  and completion of one of the following:

    ·  A successfully executed call to fflush() or fclose() on the same
       stream

    ·  A call to exit() or abort()

  If an error occurs while the character is being written, the shift state of
  the output file is undefined. See the RESTRICTIONS section for information
  about support for shift-state encoding.

  The putwc() function performs the same operation as fputwc(), but can be
  implemented as a macro on some implementations that conform to X/Open
  standards.  If implemented as a macro, this function may evaluate stream
  more than once; therefore, stream should never be implemented as an
  expression with side effects (for example, as in putwc(wc,*f++)).

  The putwchar() macro works like the putwc() function, except that
  putwchar() writes the character to the standard output stream (stdout). The
  call putwchar(wc) is equivalent to putwc(wc, stdout).

  [Digital]  With the exception of stderr, output streams are, by default,
  buffered if they refer to files, or line buffered if they refer to
  terminals. The standard error output stream, stderr, is unbuffered by
  default, but using the freopen() function causes it to become buffered or
  line buffered. Use the setbuf() function to change the stream's buffering
  strategy.

RESTRICTIONS
  Currently, the Tru64 UNIX product does not include locales whose codesets
  use shift-state encoding.  Some sections of this reference page refer to
  function behavior with respect to shift sequences.  This information is
  included only for your convenience in developing portable applications that
  run on multiple platforms, some of which may supply locales whose codesets
  do use shift-state encoding.

RETURN VALUES
  On successful completion, these functions return the value written. If
  these functions fail, they return the constant WEOF, set the error
  indicator for the stream, and set errno to indicate the error.

ERRORS
  If any of the following conditions occur, the putwc(), fputwc(), and
  putwchar() functions set errno to the corresponding value:

  [EAGAIN]
	 The O_NONBLOCK flag is set for the file descriptor underlying stream
	 and the process would be delayed in the write operation.

  [EBADF]
	 The file descriptor underlying stream is not a valid file descriptor
	 open for writing.

  [EFBIG]
	 An attempt was made to write to a file that exceeds the process's
	 file size limit or the maximum file size.

  [EINTR]
	 The write operation was interrupted by a signal that was caught, and
	 no data was transferred.

  [EILSEQ]
	 The wide-character code specified by the wc parameter does not
	 correspond to a valid character in the current locale.

  [EIO]	 One of the following errors occurred:

	   ·
	   The process is a member of a background process group attempting
	   to write to its controlling terminal; TOSTOP is set; the process
	   is neither ignoring nor blocking SIGTTOU; and the process group of
	   the process is orphaned.

	   ·
	   [XPG4-UNIX]	A physical I/O error occurred.

  [ENOSPC]
	 There was no free space remaining on the device containing the file.

  [EPIPE]
	 An attempt was made to write to a pipe or FIFO that is not open for
	 reading by any process.  A SIGPIPE signal will also be sent to the
	 process.

RELATED INFORMATION
  Functions: getc(3), getwc(3), printf(3), putc(3), puts(3), wctomb(3),
  wprintf(3)

  Others: i18n_intro(5), l10n_intro(5), standards(5)