Prevent Stockfish from exiting if DTZ table is not present

[stockfish] / src / syzygy / tbprobe.cpp

diff --git a/src/syzygy/tbprobe.cpp b/src/syzygy/tbprobe.cpp
index 8b87c250662ef60d013331911f41adafd0fc815e..4aff3b2da4bfe4d3b5f4f74c57be09d7b614647c 100644 (file)
--- a/src/syzygy/tbprobe.cpp
+++ b/src/syzygy/tbprobe.cpp
@@ -341,6 +341,10 @@ public:
 #ifndef _WIN32
         struct stat statbuf;
         int fd = ::open(fname.c_str(), O_RDONLY);
+
+        if (fd == -1)
+            return *baseAddress = nullptr, nullptr;
+
         fstat(fd, &statbuf);
         *mapping = statbuf.st_size;
         *baseAddress = mmap(nullptr, statbuf.st_size, PROT_READ, MAP_SHARED, fd, 0);
@@ -353,6 +357,10 @@ public:
 #else
         HANDLE fd = CreateFile(fname.c_str(), GENERIC_READ, FILE_SHARE_READ, nullptr,
                                OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr);
+
+        if (fd == INVALID_HANDLE_VALUE)
+            return *baseAddress = nullptr, nullptr;
+
         DWORD size_high;
         DWORD size_low = GetFileSize(fd, &size_high);
         HANDLE mmap = CreateFileMapping(fd, nullptr, PAGE_READONLY, size_high, size_low, nullptr);
@@ -380,8 +388,7 @@ public:
             || *data++ != *TB_MAGIC) {
             std::cerr << "Corrupted table in file " << fname << std::endl;
             unmap(*baseAddress, *mapping);
-            *baseAddress = nullptr;
-            return nullptr;
+            return *baseAddress = nullptr, nullptr;
         }
 
         return data;
@@ -482,7 +489,7 @@ void HashTable::insert(const std::vector<PieceType>& pieces) {
 
     TBFile file(code.insert(code.find('K', 1), "v") + ".rtbw"); // KRK -> KRvK
 
-    if (!file.is_open())
+    if (!file.is_open()) // Only WDL file is checked
         return;
 
     file.close();