The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2004 Edition
Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.

#### NAME

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

#### SYNOPSIS

> ``#include <stdarg.h>
> #include <stdio.h>
> 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 IEEE Std 1003.1-2001 defers to the ISO C standard.

> The vprintf(), vfprintf(), vsnprintf(), and vsprintf() functions shall be equivalent to printf(), fprintf(), snprintf(), and sprintf() 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(), the Base Definitions volume of IEEE Std 1003.1-2001, <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.

End of informative text.

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