Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
C6383
Collapse the table of content
Expand the table of content

C6383

warning C6383: buffer overrun due to conversion of an element count into a byte count: an element count is expected for parameter <number> in call to <function>

This warning indicates that a non-constant byte count is being passed when an element count is required. Typically, this occurs when a variable is multiplied by the sizeof a type, but code analysis suggests that an element count is required.

The following code generates this warning:

#include <string.h>

void f( wchar_t* t, wchar_t* s, int n )
{
  // code...
  wcsncpy (t, s, n*sizeof(wchar_t)); // warning 6383
  // code ...
}

To correct this warning, do not multiply the variable with the sizeof a type as shown in the following code:

void f( wchar_t* t, wchar_t* s, int n )
{
  // code 
  wcsncpy (t, s, n);
  // code ...
}

The following code corrects this warning by using the safe string manipulation function:

void f(wchar_t* t, wchar_t* s, size_t n)
{
  // code...
  wcsncpy_s( t, sizeof(s), s, n );
  // code...
} 
Show:
© 2015 Microsoft