Remove legacy EEPROM fields from FT4232H.

[libftdi] / src / ftdi.c

diff --git a/src/ftdi.c b/src/ftdi.c
index db66b87..2f77ac3 100644 (file)
--- a/src/ftdi.c
+++ b/src/ftdi.c
@@ -485,27 +485,39 @@ int ftdi_usb_get_strings2(struct ftdi_context *ftdi, struct libusb_device *dev,
     if (libusb_get_device_descriptor(dev, &desc) < 0)
         ftdi_error_return(-11, "libusb_get_device_descriptor() failed");
 
-    if (manufacturer != NULL)
+    if (manufacturer != NULL && mnf_len > 0)
     {
-        if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iManufacturer, (unsigned char *)manufacturer, mnf_len) < 0)
+        if (desc.iManufacturer == 0)
+        {
+            manufacturer[0] = '\0';
+        }
+        else if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iManufacturer, (unsigned char *)manufacturer, mnf_len) < 0)
         {
             ftdi_usb_close_internal (ftdi);
             ftdi_error_return(-7, "libusb_get_string_descriptor_ascii() failed");
         }
     }
 
-    if (description != NULL)
+    if (description != NULL && desc_len > 0)
     {
-        if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iProduct, (unsigned char *)description, desc_len) < 0)
+        if (desc.iProduct == 0)
+        {
+            description[0] = '\0';
+        }
+        else if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iProduct, (unsigned char *)description, desc_len) < 0)
         {
             ftdi_usb_close_internal (ftdi);
             ftdi_error_return(-8, "libusb_get_string_descriptor_ascii() failed");
         }
     }
 
-    if (serial != NULL)
+    if (serial != NULL && serial_len > 0)
     {
-        if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iSerialNumber, (unsigned char *)serial, serial_len) < 0)
+        if (desc.iSerialNumber == 0)
+        {
+            serial[0] = '\0';
+        }
+        else if (libusb_get_string_descriptor_ascii(ftdi->usb_dev, desc.iSerialNumber, (unsigned char *)serial, serial_len) < 0)
         {
             ftdi_usb_close_internal (ftdi);
             ftdi_error_return(-9, "libusb_get_string_descriptor_ascii() failed");
@@ -2576,8 +2588,8 @@ int ftdi_set_error_char(struct ftdi_context *ftdi,
     \retval -2: No struct ftdi_eeprom
     \retval -3: No connected device or device not yet opened
 */
-int ftdi_eeprom_initdefaults(struct ftdi_context *ftdi, char * manufacturer,
-                             char * product, char * serial)
+int ftdi_eeprom_initdefaults(struct ftdi_context *ftdi, const char * manufacturer,
+                             const char * product, const char * serial)
 {
     struct ftdi_eeprom *eeprom;
 
@@ -3101,7 +3113,8 @@ int ftdi_eeprom_build(struct ftdi_context *ftdi)
     }
 
     // Legacy port name and PnP fields for FT2232 and newer chips
-    if (ftdi->type > TYPE_BM)
+    // It doesn't appear when written with FT_Prog for FT4232H chip.
+    if (ftdi->type > TYPE_BM && ftdi->type != TYPE_4232H)
     {
         output[i & eeprom_size_mask] = 0x02; /* as seen when written with FTD2XX */
         i++;