Movatterモバイル変換

vfwprintf(3p) — Linux manual page

VFWPRINTF(3P)           POSIX Programmer's ManualVFWPRINTF(3P)

PROLOG        top

       This manual page is part of the POSIX Programmer's Manual.  The       Linux implementation of this interface may differ (consult the       corresponding Linux manual page for details of Linux behavior), or       the interface may not be implemented on Linux.

NAME        top

       vfwprintf, vswprintf, vwprintf — wide-character formatted output       of a stdarg argument list

SYNOPSIS        top

       #include <stdarg.h>       #include <stdio.h>       #include <wchar.h>       int vfwprintf(FILE *restrictstream, const wchar_t *restrictformat,           va_listarg);       int vswprintf(wchar_t *restrictws, size_tn,           const wchar_t *restrictformat, va_listarg);       int vwprintf(const wchar_t *restrictformat, va_listarg);

DESCRIPTION        top

       The functionality described on this reference page is aligned with       the ISO C standard. Any conflict between the requirements       described here and the ISO C standard is unintentional. This       volume of POSIX.1‐2017 defers to the ISO C standard.       Thevfwprintf(),vswprintf(), andvwprintf() functions shall be       equivalent tofwprintf(),swprintf(), andwprintf() respectively,       except that instead of being called with a variable number of       arguments, they are called with an argument list as defined by<stdarg.h>.       These functions shall not invoke theva_end macro. However, as       these functions do invoke theva_arg macro, the value ofap after       the return is unspecified.

RETURN VALUE        top

       Refer tofwprintf(3p).

ERRORS        top

       Refer tofwprintf(3p).The following sections are informative.

EXAMPLES        top

       None.

APPLICATION USAGE        top

       Applications using these functions should callva_end(ap)       afterwards to clean up.

RATIONALE        top

       None.

FUTURE DIRECTIONS        top

       None.

SEE ALSO        top

Section 2.5,Standard I/O Streams,fwprintf(3p)       The Base Definitions volume of POSIX.1‐2017,stdarg.h(0p),stdio.h(0p),wchar.h(0p)

COPYRIGHT        top

       Portions of this text are reprinted and reproduced in electronic       form from IEEE Std 1003.1-2017, Standard for Information       Technology -- Portable Operating System Interface (POSIX), The       Open Group Base Specifications Issue 7, 2018 Edition, Copyright       (C) 2018 by the Institute of Electrical and Electronics Engineers,       Inc and The Open Group.  In the event of any discrepancy between       this version and the original IEEE and The Open Group Standard,       the original IEEE and The Open Group Standard is the referee       document. The original Standard can be obtained online athttp://www.opengroup.org/unix/online.html .       Any typographical or formatting errors that appear in this page       are most likely to have been introduced during the conversion of       the source files to man page format. To report such errors, seehttps://www.kernel.org/doc/man-pages/reporting_bugs.html .IEEE/The Open Group                2017VFWPRINTF(3P)

Pages that refer to this page:wchar.h(0p), vswprintf(3p), vwprintf(3p)

HTML rendering created 2025-09-06 byMichael Kerrisk, author ofThe Linux Programming Interface. For details of in-depthLinux/UNIX system programming training courses that I teach, lookhere. Hosting byjambit GmbH.