Fix up backupable_db stack corruption.

Summary:
Fix up OACR(Lint) warnings.
Closes https://github.com/facebook/rocksdb/pull/3674

Differential Revision: D7563869

Pulled By: ajkr

fbshipit-source-id: 8c1e5045c8a6a2d85b2933fdbc60fde93bf0c9de

third-party/gtest-1.7.0/fused-src/gtest/gtest.h

@@ -3410,10 +3410,6 @@ inline bool IsDir(const StatStruct& st) { return S_ISDIR(st.st_mode); }
 
 GTEST_DISABLE_MSC_WARNINGS_PUSH_(4996 /* deprecated function */)
 
-inline const char* StrNCpy(char* dest, const char* src, size_t n) {
-  return strncpy(dest, src, n);
-}
-
 // ChDir(), FReopen(), FDOpen(), Read(), Write(), Close(), and
 // StrError() aren't needed on Windows CE at this time and thus not
 // defined there.

util/status.cc

@@ -15,9 +15,17 @@
 namespace rocksdb {
 
 const char* Status::CopyState(const char* state) {
+  const size_t cch = 
+      std::strlen(state) + 1; // +1 for the null terminator
   char* const result =
-      new char[std::strlen(state) + 1];  // +1 for the null terminator
-  std::strcpy(result, state);
+      new char[cch]; 
+#ifdef OS_WIN
+  errno_t ret;
+  ret = strncpy_s(result, cch, state, cch - 1);
+  assert(ret == 0);
+#else
+  std::strncpy(result, state, cch - 1);
+#endif
   return result;
 }
 

utilities/backupable/backupable_db.cc

@@ -1770,7 +1770,8 @@ Status BackupEngineImpl::BackupMeta::StoreToFile(bool sync) {
   }
 
   char writelen_temp[19];
-  if (len + sprintf(writelen_temp, "%" ROCKSDB_PRIszt "\n", files_.size()) >= buf_size) {
+  if (len + snprintf(writelen_temp, sizeof(writelen_temp),
+                     "%" ROCKSDB_PRIszt "\n", files_.size()) >= buf_size) {
     backup_meta_file->Append(Slice(buf.get(), len));
     buf.reset();
     unique_ptr<char[]> new_reset_buf(new char[max_backup_meta_file_size_]);
@@ -1785,7 +1786,8 @@ Status BackupEngineImpl::BackupMeta::StoreToFile(bool sync) {
   for (const auto& file : files_) {
     // use crc32 for now, switch to something else if needed
 
-    size_t newlen = len + file->filename.length() + sprintf(writelen_temp, " crc32 %u\n", file->checksum_value);
+    size_t newlen = len + file->filename.length() + snprintf(writelen_temp,
+      sizeof(writelen_temp), " crc32 %u\n", file->checksum_value);
     const char *const_write = writelen_temp;
     if (newlen >= buf_size) {
       backup_meta_file->Append(Slice(buf.get(), len));