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
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
fscanf(), the Base Definitions volume of IEEE Std 1003.1-2001,
<stdarg.h>,
<stdio.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 .