tools/clang-tidy/test/bugprone-suspicious-memset-usage.cpp

   1 // https://clang.llvm.org/extra/clang-tidy/checks/bugprone-suspicious-memset-usage.html
   2
   3 #include "structures.h"
   4
   5 void test(int* ip, char* cp)
   6 {
   7   // Case 1: Fill value is a character '0' instead of NUL '\0'.
   8   memset(ip, '0', 1); // WARNING: suspicious for non-char pointers
   9   memset(cp, '0', 1); // OK for char pointers
  10
  11   // Case 2: Fill value is truncated.
  12   memset(ip, 0xabcd, 1); // WARNING: fill value gets truncated
  13   memset(ip, 0x00cd, 1); // OK because value 0xcd is not truncated.
  14   memset(ip, 0x00, 1);   // OK because value is not truncated.
  15
  16   // Case 3: Byte count is zero.
  17   memset(ip, sizeof(int), 0); // WARNING: zero length, potentially swapped
  18   memset(ip, sizeof(int), 1); // OK with non-zero length
  19
  20   // See clang bug https://bugs.llvm.org/show_bug.cgi?id=38098
  21   memset(ip, 8, 0); // OK with zero length without sizeof
  22 }