vfscanf(3p) — Linux manual page

VFSCANF(3P)             POSIX Programmer's Manual            VFSCANF(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

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

SYNOPSIS         top

       #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         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.

       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         top

       Refer to fscanf(3p).

ERRORS         top

       Refer to fscanf(3p).

       The following sections are informative.

EXAMPLES         top

       None.

APPLICATION USAGE         top

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

RATIONALE         top

       None.

FUTURE DIRECTIONS         top

       None.

SEE ALSO         top

       Section 2.5, Standard I/O Streams, fscanf(3p)

       The Base Definitions volume of POSIX.1‐2017, stdarg.h(0p),
       stdio.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 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)

Pages that refer to this page: stdio.h(0p),  vscanf(3p),  vsscanf(3p)

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