# OS_VPrintf

## Syntax

  `#include <nitro/os.h>`
  `void OS_VPrintf( const char *fmt, va_list vlist );`

## Arguments

fmt | Output format string.
vlist | Variable argument list.

## Return Values

None.

## Description

Outputs a string. It is possible to provide a variable argument list following the string format (string output format). This function is equivalent to `OS_Printf()` except for the argument format.

This function is compiled with weak symbols. Therefore, you can overwrite them with your own function definitions.

The maximum string length that can be displayed is 255 characters. If a string with 256 or more characters is specified, all characters from the 256th character are ignored.

This function is used for debugging. It will not be included in the final ROM version (`FINALROM`).

## See Also

`OS_PutString`
`OS_Printf`

## Revision History

2009/10/02 Explained the maximum displayable string length.
2004/11/25 Added a description of the weak symbol.
2004/09/10 Initial version.

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