fix ftpget

src/ftpget.c

@@ -5,6 +5,16 @@
 
 #define kDefaultChunkSize 0x20
 
+static int recv(uint8_t* buf, uint8_t size) {
+    uint16_t ds = 0;
+    asm volatile ("push %%ds    \n\t"
+            "mov %0, %%ds \n\t"
+            "pop %0       \n" : "+r"(ds));
+    int len = read(kLpt1, buf, size);
+    asm volatile ("mov %0, %%ds" :: "r"(ds));
+    return len;
+}
+
 int main(int argc, uint16_t argv[]) {
     if (argc < 2) {
         return -1;
@@ -17,17 +27,26 @@ int main(int argc, uint16_t argv[]) {
         chunksize = argv[2];
     }
 
-    uint8_t ok = 0x42;
+    uint8_t ack = 0x42;
+    int i;
 
-    for (int i = 0; i < size;) {
-        runcomms(kUntilIdle);
+    for (i = 0; i < size;) {
         // delay?
 
-        int len = read(kLpt1, dest + i, chunksize);
+        int len;
+        for (int j = 0; j < 3; j++) {
+            int r = runcomms(kUntilIdle);
+            len = recv(dest + i, chunksize);
+            if (len > 0) {
+                break;
+            }
+        }
         if (len <= 0) {
             break;
         }
-        write(kLpt1, &ok, 1);
+        write(kLpt1, &ack, 1);
         i += len;
     }
+
+    return i;
 }