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-'\" t
-.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
-.\"
-.\" SPDX-License-Identifier: GPL-2.0-or-later
-.\"
-.\" References consulted:
-.\" GNU glibc-2 source code and manual
-.\" Dinkumware C library reference http://www.dinkumware.com/
-.\" OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
-.\" ISO/IEC 9899:1999
-.\"
-.TH wprintf 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-wprintf, fwprintf, swprintf, vwprintf, vfwprintf, vswprintf \- formatted
-wide-character output conversion
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <stdio.h>
-.B #include <wchar.h>
-.PP
-.BI "int wprintf(const wchar_t *restrict " format ", ...);"
-.BI "int fwprintf(FILE *restrict " stream ,
-.BI " const wchar_t *restrict " format ", ...);"
-.BI "int swprintf(wchar_t " wcs "[restrict ." maxlen "], size_t " maxlen ,
-.BI " const wchar_t *restrict " format ", ...);"
-.PP
-.BI "int vwprintf(const wchar_t *restrict " format ", va_list " args );
-.BI "int vfwprintf(FILE *restrict " stream ,
-.BI " const wchar_t *restrict " format ", va_list " args );
-.BI "int vswprintf(wchar_t " wcs "[restrict ." maxlen "], size_t " maxlen ,
-.BI " const wchar_t *restrict " format ", va_list " args );
-.fi
-.PP
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.PP
-All functions shown above:
-.\" .BR wprintf (),
-.\" .BR fwprintf (),
-.\" .BR swprintf (),
-.\" .BR vwprintf (),
-.\" .BR vfwprintf (),
-.\" .BR vswprintf ():
-.nf
- _XOPEN_SOURCE >= 500 || _ISOC99_SOURCE
- || _POSIX_C_SOURCE >= 200112L
-.fi
-.SH DESCRIPTION
-The
-.BR wprintf ()
-family of functions is
-the wide-character equivalent of the
-.BR printf (3)
-family of functions.
-It performs formatted output of wide
-characters.
-.PP
-The
-.BR wprintf ()
-and
-.BR vwprintf ()
-functions
-perform wide-character output to
-.IR stdout .
-.I stdout
-must not be byte oriented; see
-.BR fwide (3)
-for more information.
-.PP
-The
-.BR fwprintf ()
-and
-.BR vfwprintf ()
-functions
-perform wide-character output to
-.IR stream .
-.I stream
-must not be byte oriented; see
-.BR fwide (3)
-for more information.
-.PP
-The
-.BR swprintf ()
-and
-.BR vswprintf ()
-functions
-perform wide-character output
-to an array of wide characters.
-The programmer must ensure that there is
-room for at least
-.I maxlen
-wide
-characters at
-.IR wcs .
-.PP
-These functions are like
-the
-.BR printf (3),
-.BR vprintf (3),
-.BR fprintf (3),
-.BR vfprintf (3),
-.BR sprintf (3),
-.BR vsprintf (3)
-functions except for the
-following differences:
-.TP
-.B \[bu]
-The
-.I format
-string is a wide-character string.
-.TP
-.B \[bu]
-The output consists of wide characters, not bytes.
-.TP
-.B \[bu]
-.BR swprintf ()
-and
-.BR vswprintf ()
-take a
-.I maxlen
-argument,
-.BR sprintf (3)
-and
-.BR vsprintf (3)
-do not.
-.RB ( snprintf (3)
-and
-.BR vsnprintf (3)
-take a
-.I maxlen
-argument, but these functions do not return \-1 upon
-buffer overflow on Linux.)
-.PP
-The treatment of the conversion characters
-.B c
-and
-.B s
-is different:
-.TP
-.B c
-If no
-.B l
-modifier is present, the
-.I int
-argument is converted to a wide character by a call to the
-.BR btowc (3)
-function, and the resulting wide character is written.
-If an
-.B l
-modifier is present, the
-.I wint_t
-(wide character) argument is written.
-.TP
-.B s
-If no
-.B l
-modifier is present: the
-.I "const\ char\ *"
-argument is expected to be a pointer to an array of character type
-(pointer to a string) containing a multibyte character sequence beginning
-in the initial shift state.
-Characters from the array are converted to
-wide characters (each by a call to the
-.BR mbrtowc (3)
-function with a conversion state starting in the initial state before
-the first byte).
-The resulting wide characters are written up to
-(but not including) the terminating null wide character (L\[aq]\e0\[aq]).
-If a precision is
-specified, no more wide characters than the number specified are written.
-Note that the precision determines the number of
-.I wide characters
-written, not the number of
-.I bytes
-or
-.IR "screen positions" .
-The array must contain a terminating null byte (\[aq]\e0\[aq]),
-unless a precision is given
-and it is so small that the number of converted wide characters reaches it
-before the end of the array is reached.
-If an
-.B l
-modifier is present: the
-.I "const\ wchar_t\ *"
-argument is expected to be a pointer to an array of wide characters.
-Wide characters from the array are written up to (but not including) a
-terminating null wide character.
-If a precision is specified, no more than
-the number specified are written.
-The array must contain a terminating null
-wide character, unless a precision is given and it is smaller than or equal
-to the number of wide characters in the array.
-.SH RETURN VALUE
-The functions return the number of wide characters written, excluding the
-terminating null wide character in
-case of the functions
-.BR swprintf ()
-and
-.BR vswprintf ().
-They return \-1 when an error occurs.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.ad l
-.nh
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface Attribute Value
-T{
-.BR wprintf (),
-.BR fwprintf (),
-.BR swprintf (),
-.BR vwprintf (),
-.BR vfwprintf (),
-.BR vswprintf ()
-T} Thread safety MT-Safe locale
-.TE
-.hy
-.ad
-.sp 1
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001, C99.
-.SH NOTES
-The behavior of
-.BR wprintf ()
-et al. depends
-on the
-.B LC_CTYPE
-category of the
-current locale.
-.PP
-If the
-.I format
-string contains non-ASCII wide characters, the program
-will work correctly only if the
-.B LC_CTYPE
-category of the current locale at
-run time is the same as the
-.B LC_CTYPE
-category of the current locale at
-compile time.
-This is because the
-.I wchar_t
-representation is platform- and locale-dependent.
-(The glibc represents
-wide characters using their Unicode (ISO/IEC 10646) code point, but other
-platforms don't do this.
-Also, the use of C99 universal character names
-of the form \eunnnn does not solve this problem.)
-Therefore, in
-internationalized programs, the
-.I format
-string should consist of ASCII
-wide characters only, or should be constructed at run time in an
-internationalized way (e.g., using
-.BR gettext (3)
-or
-.BR iconv (3),
-followed by
-.BR mbstowcs (3)).
-.SH SEE ALSO
-.BR fprintf (3),
-.BR fputwc (3),
-.BR fwide (3),
-.BR printf (3),
-.BR snprintf (3)
-.\" .BR wscanf (3)