vsnprintf — Format a string and place it in a buffer
int vsnprintf (char * buf, size_t size, const char * fmt, va_list args);
bufThe buffer to place the result into
sizeThe size of the buffer, including the trailing null space
fmtThe format string to use
argsArguments for the format string
The return value is the number of characters which would
be generated for the given input, excluding the trailing
'\0', as per ISO C99. If you want to have the exact
number of characters written into buf as return value
(not including the trailing '\0'), use vscnprintf. If the
return is greater than or equal to size, the resulting
string is truncated.
Call this function if you are already dealing with a va_list. You probably want snprintf instead.