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WPRINTF(3)                 Linux Programmer's ManualWPRINTF(3)NAME       wprintf, fwprintf, swprintf, vwprintf, vfwprintf, vswprintf - formatted       wide-character output conversionSYNOPSIS       #include <stdio.h>       #include <wchar.h>       int wprintf(const wchar_t *format, ...);       int fwprintf(FILE *stream, const wchar_t *format, ...);       int swprintf(wchar_t *wcs, size_t maxlen,                    const wchar_t *format, ...);       int vwprintf(const wchar_t *format, va_list args);       int vfwprintf(FILE *stream, const wchar_t *format, va_list args);       int vswprintf(wchar_t *wcs, size_t maxlen,                     const wchar_t *format, va_list args);   Feature Test Macro Requirements for glibc (seefeature_test_macros(7)):       All functions shown above:           _XOPEN_SOURCE >= 500 || _ISOC99_SOURCE ||           _POSIX_C_SOURCE >= 200112LDESCRIPTION       The wprintf() family of functions is the wide-character  equivalent  of       theprintf(3)  family  of  functions.  It performs formatted output of       wide characters.       The wprintf() and vwprintf() functions perform wide-character output to       stdout.  stdout must not be byte oriented; seefwide(3) for more infor-       mation.       The fwprintf() and vfwprintf() functions perform wide-character  output       to stream.  stream must not be byte oriented; seefwide(3) for more in-       formation.       The swprintf() and vswprintf() functions perform wide-character  output       to  an array of wide characters.  The programmer must ensure that there       is room for at least maxlen wide characters at wcs.       These functions are like theprintf(3),vprintf(3),fprintf(3),  vf-printf(3),sprintf(3),vsprintf(3) functions except for the following       differences:       o      The format string is a wide-character string.       o      The output consists of wide characters, not bytes.       o      swprintf() and vswprintf() take a  maxlen  argument,sprintf(3)              andvsprintf(3)  do  not.  (snprintf(3) andvsnprintf(3) take a              maxlen argument, but these functions do not return -1 upon  buf-              fer overflow on Linux.)       The treatment of the conversion characters c and s is different:       c      If  no l modifier is present, the int argument is converted to a              wide character by a call to thebtowc(3) function, and  the  re-              sulting wide character is written.  If an l modifier is present,              the wint_t (wide character) argument is written.       s      If no l modifier is present: the const char *  argument  is  ex-              pected 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 con-              verted to wide characters (each by  a  call  to  thembrtowc(3)              function  with  a conversion state starting in the initial state              before the first byte).  The resulting wide characters are writ-              ten  up to (but not including) the terminating null wide charac-              ter (L'\0').  If a precision is specified, no more wide  charac-              ters  than the number specified are written.  Note that the pre-              cision determines the number of wide characters written, not the              number  of  bytes or screen positions.  The array must contain a              terminating null byte ('\0'), 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 l modifier  is              present:  the  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 ter-              minating null wide character, unless a precision is given and it              is smaller than or equal to the number of wide characters in the              array.RETURN VALUE       The functions return the number of wide characters  written,  excluding       the terminating null wide character in case of the functions swprintf()       and vswprintf().  They return -1 when an error occurs.ATTRIBUTES       For an  explanation  of  the  terms  used  in  this  section,  see  at-tributes(7).       +-------------------------+---------------+----------------+       |Interface                | Attribute     | Value          |       +-------------------------+---------------+----------------+       |wprintf(), fwprintf(),   | Thread safety | MT-Safe locale |       |swprintf(), vwprintf(),  |               |                |       |vfwprintf(), vswprintf() |               |                |       +-------------------------+---------------+----------------+CONFORMING TO       POSIX.1-2001, POSIX.1-2008, C99.NOTES       The  behavior  of  wprintf() et al. depends on the LC_CTYPE category of       the current locale.       If the format string contains non-ASCII wide  characters,  the  program       will work correctly only if the LC_CTYPE category of the current locale       at run time is the same as the LC_CTYPE category of the current  locale       at  compile  time.  This is because the wchar_t representation is plat-       form- and locale-dependent.  (The glibc represents wide characters  us-       ing  their Unicode (ISO-10646) code point, but other platforms don't do       this.  Also, the use of C99  universal  character  names  of  the  form       \unnnn  does  not solve this problem.)  Therefore, in internationalized       programs, the format string should consist  of  ASCII  wide  characters       only,  or should be constructed at run time in an internationalized way       (e.g., usinggettext(3) oriconv(3), followed bymbstowcs(3)).SEE ALSOfprintf(3),fputwc(3),fwide(3),printf(3),snprintf(3)COLOPHON       This page is part of release 5.05 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       https://www.kernel.org/doc/man-pages/.GNU                               2019-03-06WPRINTF(3)