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The Open Group Base Specifications Issue 7
IEEE Std 1003.1-2008
Copyright © 2001-2008 The IEEE and The Open Group

#### NAME

> vdprintf, vfprintf, vprintf, vsnprintf, vsprintf - format output of a stdarg argument list

#### SYNOPSIS

> ``#include <stdarg.h>
> #include <stdio.h>
> ``

> ``[CX] 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`);
> `

#### DESCRIPTION

> [CX] 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 [CX] vdprintf(), vfprintf(), vprintf(), vsnprintf(), and vsprintf() functions shall be equivalent to the [CX] 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.

#### RETURN VALUE

> Refer to fprintf .

#### ERRORS

> Refer to fprintf .

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

> fprintf

> XBD <stdarg.h> , <stdio.h>

#### CHANGE HISTORY

> First released in Issue 1. Derived from Issue 1 of the SVID.

#### Issue 5

> The vsnprintf() function is added.

#### Issue 6

> The vfprintf(), vprintf(), vsnprintf(), and vsprintf() functions are updated for alignment with the ISO/IEC 9899:1999 standard.

#### Issue 7

> The vdprintf() function is added to complement the dprintf() function from The Open Group Technical Standard, 2006, Extended API Set Part 1.

End of informative text.

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Copyright © 2001-2008 The IEEE and The Open Group, All Rights Reserved
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