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.1-2017
       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.1-2017, <stdarg.h>, <stdio.h>

COPYRIGHT
       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 at http://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, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                  2017                          VFSCANF(3P)