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VFPRINTF(3P) POSIX Programmer's Manual VFPRINTF(3P)
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.
vdprintf, vfprintf, vprintf, vsnprintf, vsprintf — format output of a
stdarg argument list
#include <stdarg.h>
#include <stdio.h>
int vdprintf(int fildes, const char *restrict format, va_list ap);
int vfprintf(FILE *restrict stream, const char *restrict format,
va_list ap);
int vprintf(const char *restrict format, va_list ap);
int vsnprintf(char *restrict s, size_t n, const char *restrict format,
va_list ap);
int vsprintf(char *restrict s, const char *restrict format, va_list ap);
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 vdprintf(), vfprintf(), vprintf(), vsnprintf(), and vsprintf()
functions shall be equivalent to the dprintf(), fprintf(), printf(),
snprintf(), and sprintf() functions respectively, except that instead
of being called with a variable number of arguments, they are called
with an argument list as defined by <stdarg.h>.
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.
Refer to fprintf(3p).
Refer to fprintf(3p).
The following sections are informative.
None.
Applications using these functions should call va_end(ap) afterwards
to clean up.
None.
None.
Section 2.5, Standard I/O Streams, fprintf(3p)
The Base Definitions volume of POSIX.1‐2008, stdarg.h(0p),
stdio.h(0p)
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 VFPRINTF(3P)
Pages that refer to this page: stdio.h(0p), stdin(3p), vprintf(3p), vsnprintf(3p)