Improve MinGW compatibility

src/main.c

@@ -712,7 +712,11 @@ int main () {
     }
     // Handle packet data
     handlePacket(client_fd, length - sizeVarInt(packet_id), packet_id, state);
-    if (recv_count == 0 || (recv_count == -1 && errno != EAGAIN && errno != EWOULDBLOCK)) {
+    #ifdef _WIN32
+      if (recv_count == 0 || (recv_count == -1 && WSAGetLastError() != WSAEWOULDBLOCK)) {
+    #else
+      if (recv_count == 0 || (recv_count == -1 && errno != EAGAIN && errno != EWOULDBLOCK)) {
+    #endif
       disconnectClient(&clients[client_index], 4);
       continue;
     }

src/tools.c

@@ -53,7 +53,11 @@ ssize_t recv_all (int client_fd, void *buf, size_t n, uint8_t require_first) {
   if (require_first) {
     ssize_t r = recv(client_fd, p, 1, MSG_PEEK);
     if (r <= 0) {
-      if (r < 0 && (errno == EAGAIN || errno == EWOULDBLOCK)) {
+      #ifdef _WIN32
+        if (r < 0 && (WSAGetLastError() == WSAEWOULDBLOCK)) {
+      #else
+        if (r < 0 && (errno == EAGAIN || errno == EWOULDBLOCK)) {
+      #endif
         return 0; // no first byte available yet
       }
       return -1; // error or connection closed
@@ -64,7 +68,11 @@ ssize_t recv_all (int client_fd, void *buf, size_t n, uint8_t require_first) {
   while (total < n) {
     ssize_t r = recv(client_fd, p + total, n - total, 0);
     if (r < 0) {
-      if (errno == EAGAIN || errno == EWOULDBLOCK) {
+      #ifdef _WIN32
+        if (WSAGetLastError() == WSAEWOULDBLOCK) {
+      #else
+        if (errno == EAGAIN || errno == EWOULDBLOCK) {
+      #endif
         // handle network timeout
         if (get_program_time() - last_update_time > NETWORK_TIMEOUT_TIME) {
           disconnectClient(&client_fd, -1);
@@ -111,7 +119,11 @@ ssize_t send_all (int client_fd, const void *buf, ssize_t len) {
       continue;
     }
     if (n == 0) { // connection was closed, treat this as an error
-      errno = ECONNRESET;
+      #ifdef _WIN32
+        errno = WSAECONNRESET;
+      #else
+        errno = ECONNRESET;
+      #endif
       return -1;
     }
     // not yet ready to transmit, try again
@@ -277,8 +289,15 @@ uint64_t splitmix64 (uint64_t state) {
 // the start of the program*, and NOT wall clock time. To ensure
 // compatibility, this should only be used to measure time intervals.
 int64_t get_program_time () {
-  struct timespec ts;
-  clock_gettime(CLOCK_MONOTONIC, &ts);
-  return (int64_t)ts.tv_sec * 1000000LL + ts.tv_nsec / 1000LL;
+  #ifdef _WIN32
+    LARGE_INTEGER frequency, counter;
+    QueryPerformanceFrequency(&frequency);
+    QueryPerformanceCounter(&counter);
+    return (int64_t)(counter.QuadPart * 1000000LL / frequency.QuadPart);
+  #else
+    struct timespec ts;
+    clock_gettime(CLOCK_MONOTONIC, &ts);
+    return (int64_t)ts.tv_sec * 1000000LL + ts.tv_nsec / 1000LL;
+  #endif
 }
 #endif