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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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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.1‐2017 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.1‐2017, stdarg.h(0p),
stdio.h(0p)
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 VFPRINTF(3P)
Pages that refer to this page: stdio.h(0p), stdin(3p), vprintf(3p), vsnprintf(3p)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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