vsprintf
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## Name

vsprintf — Format a string and place it in a buffer

## Synopsis

`int vsprintf (` | char * buf,
| const char * fmt,
| va_list args`)`;

## Arguments

`buf`

  The buffer to place the result into

`fmt`

  The format string to use

`args`

  Arguments for the format string

## Description

The function returns the number of characters written into `buf`. Use `vsnprintf` or `vscnprintf` in order to avoid buffer overflows.

If you're not already dealing with a va_list consider using `sprintf`.

See the `vsnprintf` documentation for format string extensions over C99.

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