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VFSCANF(3P)                POSIX Programmer's Manual               VFSCANF(3P)
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  unspeci-
       fied.
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 Electri-
       cal 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.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                          VFSCANF(3P)