PROLOG

       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

       vfscanf, vscanf, vsscanf — format input of a stdarg argument list

SYNOPSIS

       #include <stdarg.h>
       #include <stdio.h>

       int vfscanf(FILE *restrict stream, const char *restrict format,
           va_list arg);
       int vscanf(const char *restrict format, va_list arg);
       int vsscanf(const char *restrict s, const char *restrict format,
           va_list arg);

DESCRIPTION

       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.1‐2008 defers to the ISO C standard.

       The  vscanf(),  vfscanf(),  and  vsscanf()  functions  shall  be equivalent to the scanf(), fscanf(), and
       sscanf() functions, respectively, except  that  instead  of  being  called  with  a  variable  number  of
       arguments,  they  are  called  with an argument list as defined in the <stdarg.h> header. These functions
       shall not invoke the va_end macro. As these functions invoke the va_arg macro, the value of ap after  the
       return is unspecified.

RETURN VALUE

       Refer to fscanf().

ERRORS

       Refer to fscanf().

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

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

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       Section 2.5, Standard I/O Streams, fscanf()

       The Base Definitions volume of POSIX.1‐2008, <stdarg.h>, <stdio.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition,
       Standard  for  Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers,  Inc
       and  The  Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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 at
       http://www.unix.org/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,   see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                                   2013                                       VFSCANF(3POSIX)