Warning C6383
Buffer overrun due to conversion of an element count into a byte count: an element count is expected for parameter
*parameter_name*in call to*function_name*
This warning indicates that a non-constant byte count is being passed when an element count is instead required.
Remarks
Typically, this warning occurs when a variable is multiplied by the sizeof a type. This issue will likely result in more bytes being copied to the buffer than it can hold.
Code analysis name: ELEMENTS_TO_BYTES
Example
The following code generates this warning. wcsncpy will allow n * sizeof(wchar_t) characters to be copied, but the buffer can only hold n characters. It should be noted that wcsncpy is an unsafe function, and shouldn't be used per C28719. The unsafe variant is used here only for the purposes of demonstrating this warning:
void f(wchar_t* t, wchar_t* s, int n)
{
wcsncpy (t, s, n*sizeof(wchar_t));
}
The following code corrects this warning by sending element count instead of the byte count:
void f( wchar_t* t, wchar_t* s, int n )
{
wcsncpy (t, s, n);
}