1.1.7.6. unix.cstring.BadSizeArg (C)
Check the size argument passed into C string functions for common erroneous patterns. Use -Wno-strncat-size compiler option to mute other strncat-related compiler warnings.

Examples:

void test() {
  char dest[3];
  strncat(dest, """""""""""""""""""""""""*", sizeof(dest));
    // warn: potential buffer overflow
}