windows.c

   1 /*
   2  * This file is part of the libserialport project.
   3  *
   4  * Copyright (C) 2013-2014 Martin Ling <martin-libserialport@earth.li>
   5  * Copyright (C) 2014 Aurelien Jacobs <aurel@gnuage.org>
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Lesser General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "libserialport_internal.h"
  22
  23 /* USB path is a string of at most 8 decimal numbers < 128 separated by dots. */
  24 #define MAX_USB_PATH ((8 * 3) + (7 * 1) + 1)
  25
  26 static void enumerate_hub(struct sp_port *port, const char *hub_name,
  27                           const char *parent_path, DEVINST dev_inst);
  28
  29 static char *wc_to_utf8(PWCHAR wc_buffer, ULONG wc_bytes)
  30 {
  31         ULONG wc_length = wc_bytes / sizeof(WCHAR);
  32         ULONG utf8_bytes;
  33         WCHAR *wc_str = NULL;
  34         char *utf8_str = NULL;
  35
  36         /* Allocate aligned wide char buffer */
  37         if (!(wc_str = malloc((wc_length + 1) * sizeof(WCHAR))))
  38                 goto wc_to_utf8_end;
  39
  40         /* Zero-terminate the wide char string. */
  41         memcpy(wc_str, wc_buffer, wc_bytes);
  42         wc_str[wc_length] = 0;
  43
  44         /* Compute the size of the UTF-8 converted string. */
  45         if (!(utf8_bytes = WideCharToMultiByte(CP_ACP, WC_NO_BEST_FIT_CHARS, wc_str, -1,
  46                                          NULL, 0, NULL, NULL)))
  47                 goto wc_to_utf8_end;
  48
  49         /* Allocate UTF-8 output buffer. */
  50         if (!(utf8_str = malloc(utf8_bytes)))
  51                 goto wc_to_utf8_end;
  52
  53         /* Actually converted to UTF-8. */
  54         if (!WideCharToMultiByte(CP_ACP, WC_NO_BEST_FIT_CHARS, wc_str, -1,
  55                                  utf8_str, utf8_bytes, NULL, NULL)) {
  56                 free(utf8_str);
  57                 utf8_str = NULL;
  58                 goto wc_to_utf8_end;
  59         }
  60
  61 wc_to_utf8_end:
  62         if (wc_str)
  63                 free(wc_str);
  64
  65         return utf8_str;
  66 }
  67
  68 static char *get_root_hub_name(HANDLE host_controller)
  69 {
  70         USB_ROOT_HUB_NAME root_hub_name;
  71         PUSB_ROOT_HUB_NAME root_hub_name_wc;
  72         char *root_hub_name_utf8;
  73         ULONG size = 0;
  74
  75         /* Compute the size of the root hub name string. */
  76         if (!DeviceIoControl(host_controller, IOCTL_USB_GET_ROOT_HUB_NAME, 0, 0,
  77                              &root_hub_name, sizeof(root_hub_name), &size, NULL))
  78                 return NULL;
  79
  80         /* Allocate wide char root hub name string. */
  81         size = root_hub_name.ActualLength;
  82         if (!(root_hub_name_wc = malloc(size)))
  83                 return NULL;
  84
  85         /* Actually get the root hub name string. */
  86         if (!DeviceIoControl(host_controller, IOCTL_USB_GET_ROOT_HUB_NAME,
  87                              NULL, 0, root_hub_name_wc, size, &size, NULL)) {
  88                 free(root_hub_name_wc);
  89                 return NULL;
  90         }
  91
  92         /* Convert the root hub name string to UTF-8. */
  93         root_hub_name_utf8 = wc_to_utf8(root_hub_name_wc->RootHubName, size - offsetof(USB_ROOT_HUB_NAME, RootHubName));
  94         free(root_hub_name_wc);
  95         return root_hub_name_utf8;
  96 }
  97
  98 static char *get_external_hub_name(HANDLE hub, ULONG connection_index)
  99 {
 100         USB_NODE_CONNECTION_NAME ext_hub_name;
 101         PUSB_NODE_CONNECTION_NAME ext_hub_name_wc;
 102         char *ext_hub_name_utf8;
 103         ULONG size;
 104
 105         /* Compute the size of the external hub name string. */
 106         ext_hub_name.ConnectionIndex = connection_index;
 107         if (!DeviceIoControl(hub, IOCTL_USB_GET_NODE_CONNECTION_NAME,
 108                              &ext_hub_name, sizeof(ext_hub_name),
 109                              &ext_hub_name, sizeof(ext_hub_name), &size, NULL))
 110                 return NULL;
 111
 112         /* Allocate wide char external hub name string. */
 113         size = ext_hub_name.ActualLength;
 114         if (size <= sizeof(ext_hub_name)
 115             || !(ext_hub_name_wc = malloc(size)))
 116                 return NULL;
 117
 118         /* Get the name of the external hub attached to the specified port. */
 119         ext_hub_name_wc->ConnectionIndex = connection_index;
 120         if (!DeviceIoControl(hub, IOCTL_USB_GET_NODE_CONNECTION_NAME,
 121                              ext_hub_name_wc, size,
 122                              ext_hub_name_wc, size, &size, NULL)) {
 123                 free(ext_hub_name_wc);
 124                 return NULL;
 125         }
 126
 127         /* Convert the external hub name string to UTF-8. */
 128         ext_hub_name_utf8 = wc_to_utf8(ext_hub_name_wc->NodeName, size - offsetof(USB_NODE_CONNECTION_NAME, NodeName));
 129         free(ext_hub_name_wc);
 130         return ext_hub_name_utf8;
 131 }
 132
 133 static char *get_string_descriptor(HANDLE hub_device, ULONG connection_index,
 134                                    UCHAR descriptor_index)
 135 {
 136         char desc_req_buf[sizeof(USB_DESCRIPTOR_REQUEST) +
 137                           MAXIMUM_USB_STRING_LENGTH] = { 0 };
 138         PUSB_DESCRIPTOR_REQUEST desc_req = (void *)desc_req_buf;
 139         PUSB_STRING_DESCRIPTOR desc = (void *)(desc_req + 1);
 140         ULONG size = sizeof(desc_req_buf);
 141
 142         desc_req->ConnectionIndex = connection_index;
 143         desc_req->SetupPacket.wValue = (USB_STRING_DESCRIPTOR_TYPE << 8)
 144                                        | descriptor_index;
 145         desc_req->SetupPacket.wIndex = 0;
 146         desc_req->SetupPacket.wLength = (USHORT) (size - sizeof(*desc_req));
 147
 148         if (!DeviceIoControl(hub_device,
 149                              IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION,
 150                              desc_req, size, desc_req, size, &size, NULL)
 151             || size < 2
 152             || desc->bDescriptorType != USB_STRING_DESCRIPTOR_TYPE
 153             || desc->bLength != size - sizeof(*desc_req)
 154             || desc->bLength % 2)
 155                 return NULL;
 156
 157         return wc_to_utf8(desc->bString, desc->bLength - offsetof(USB_STRING_DESCRIPTOR, bString));
 158 }
 159
 160 static void enumerate_hub_ports(struct sp_port *port, HANDLE hub_device,
 161                                 ULONG nb_ports, const char *parent_path, DEVINST dev_inst)
 162 {
 163         char path[MAX_USB_PATH];
 164         ULONG index = 0;
 165
 166         for (index = 1; index <= nb_ports; index++) {
 167                 PUSB_NODE_CONNECTION_INFORMATION_EX connection_info_ex;
 168                 ULONG size = sizeof(*connection_info_ex) + (30 * sizeof(USB_PIPE_INFO));
 169
 170                 if (!(connection_info_ex = malloc(size)))
 171                         break;
 172
 173                 connection_info_ex->ConnectionIndex = index;
 174                 if (!DeviceIoControl(hub_device,
 175                                      IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX,
 176                                      connection_info_ex, size,
 177                                      connection_info_ex, size, &size, NULL)) {
 178                         /*
 179                          * Try to get CONNECTION_INFORMATION if
 180                          * CONNECTION_INFORMATION_EX did not work.
 181                          */
 182                         PUSB_NODE_CONNECTION_INFORMATION connection_info;
 183
 184                         size = sizeof(*connection_info) + (30 * sizeof(USB_PIPE_INFO));
 185                         if (!(connection_info = malloc(size))) {
 186                                 free(connection_info_ex);
 187                                 continue;
 188                         }
 189                         connection_info->ConnectionIndex = index;
 190                         if (!DeviceIoControl(hub_device,
 191                                              IOCTL_USB_GET_NODE_CONNECTION_INFORMATION,
 192                                              connection_info, size,
 193                                              connection_info, size, &size, NULL)) {
 194                                 free(connection_info);
 195                                 free(connection_info_ex);
 196                                 continue;
 197                         }
 198
 199                         connection_info_ex->ConnectionIndex = connection_info->ConnectionIndex;
 200                         connection_info_ex->DeviceDescriptor = connection_info->DeviceDescriptor;
 201                         connection_info_ex->DeviceIsHub = connection_info->DeviceIsHub;
 202                         connection_info_ex->DeviceAddress = connection_info->DeviceAddress;
 203                         free(connection_info);
 204                 }
 205
 206                 if (connection_info_ex->DeviceIsHub) {
 207                         /* Recursively enumerate external hub. */
 208                         PCHAR ext_hub_name;
 209                         if ((ext_hub_name = get_external_hub_name(hub_device, index))) {
 210                                 snprintf(path, sizeof(path), "%s%ld.",
 211                                          parent_path, connection_info_ex->ConnectionIndex);
 212                                 enumerate_hub(port, ext_hub_name, path, dev_inst);
 213                         }
 214                         free(connection_info_ex);
 215                 } else {
 216                         snprintf(path, sizeof(path), "%s%ld",
 217                                  parent_path, connection_info_ex->ConnectionIndex);
 218
 219                         /* Check if this device is the one we search for. */
 220                         if (strcmp(path, port->usb_path)) {
 221                                 free(connection_info_ex);
 222                                 continue;
 223                         }
 224
 225                         /* Finally grab detailed information regarding the device. */
 226                         port->usb_address = connection_info_ex->DeviceAddress + 1;
 227                         port->usb_vid = connection_info_ex->DeviceDescriptor.idVendor;
 228                         port->usb_pid = connection_info_ex->DeviceDescriptor.idProduct;
 229
 230                         if (connection_info_ex->DeviceDescriptor.iManufacturer)
 231                                 port->usb_manufacturer = get_string_descriptor(hub_device, index,
 232                                            connection_info_ex->DeviceDescriptor.iManufacturer);
 233                         if (connection_info_ex->DeviceDescriptor.iProduct)
 234                                 port->usb_product = get_string_descriptor(hub_device, index,
 235                                            connection_info_ex->DeviceDescriptor.iProduct);
 236                         if (connection_info_ex->DeviceDescriptor.iSerialNumber) {
 237                                 port->usb_serial = get_string_descriptor(hub_device, index,
 238                                            connection_info_ex->DeviceDescriptor.iSerialNumber);
 239                                 if (port->usb_serial == NULL) {
 240                                         //composite device, get the parent's serial number
 241                                         char device_id[MAX_DEVICE_ID_LEN];
 242                                         if (CM_Get_Parent(&dev_inst, dev_inst, 0) == CR_SUCCESS) {
 243                                                 if (CM_Get_Device_IDA(dev_inst, device_id, sizeof(device_id), 0) == CR_SUCCESS)
 244                                                         port->usb_serial = strdup(strrchr(device_id, '\\')+1);
 245                                         }
 246                                 }
 247                         }
 248
 249                         free(connection_info_ex);
 250                         break;
 251                 }
 252         }
 253 }
 254
 255 static void enumerate_hub(struct sp_port *port, const char *hub_name,
 256                           const char *parent_path, DEVINST dev_inst)
 257 {
 258         USB_NODE_INFORMATION hub_info;
 259         HANDLE hub_device;
 260         ULONG size = sizeof(hub_info);
 261         char *device_name;
 262
 263         /* Open the hub with its full name. */
 264         if (!(device_name = malloc(strlen("\\\\.\\") + strlen(hub_name) + 1)))
 265                 return;
 266         strcpy(device_name, "\\\\.\\");
 267         strcat(device_name, hub_name);
 268         hub_device = CreateFileA(device_name, GENERIC_WRITE, FILE_SHARE_WRITE,
 269                                  NULL, OPEN_EXISTING, 0, NULL);
 270         free(device_name);
 271         if (hub_device == INVALID_HANDLE_VALUE)
 272                 return;
 273
 274         /* Get the number of ports of the hub. */
 275         if (DeviceIoControl(hub_device, IOCTL_USB_GET_NODE_INFORMATION,
 276                             &hub_info, size, &hub_info, size, &size, NULL))
 277                 /* Enumerate the ports of the hub. */
 278                 enumerate_hub_ports(port, hub_device,
 279                    hub_info.u.HubInformation.HubDescriptor.bNumberOfPorts, parent_path, dev_inst);
 280
 281         CloseHandle(hub_device);
 282 }
 283
 284 static void enumerate_host_controller(struct sp_port *port,
 285                                       HANDLE host_controller_device,
 286                                       DEVINST dev_inst)
 287 {
 288         char *root_hub_name;
 289
 290         if ((root_hub_name = get_root_hub_name(host_controller_device))) {
 291                 enumerate_hub(port, root_hub_name, "", dev_inst);
 292                 free(root_hub_name);
 293         }
 294 }
 295
 296 static void get_usb_details(struct sp_port *port, DEVINST dev_inst_match)
 297 {
 298         HDEVINFO device_info;
 299         SP_DEVINFO_DATA device_info_data;
 300         ULONG i, size = 0;
 301
 302         device_info = SetupDiGetClassDevs(&GUID_CLASS_USB_HOST_CONTROLLER, NULL, NULL,
 303                                           DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
 304         device_info_data.cbSize = sizeof(device_info_data);
 305
 306         for (i = 0; SetupDiEnumDeviceInfo(device_info, i, &device_info_data); i++) {
 307                 SP_DEVICE_INTERFACE_DATA device_interface_data;
 308                 PSP_DEVICE_INTERFACE_DETAIL_DATA device_detail_data;
 309                 DEVINST dev_inst = dev_inst_match;
 310                 HANDLE host_controller_device;
 311
 312                 device_interface_data.cbSize = sizeof(device_interface_data);
 313                 if (!SetupDiEnumDeviceInterfaces(device_info, 0,
 314                                                  &GUID_CLASS_USB_HOST_CONTROLLER,
 315                                                  i, &device_interface_data))
 316                         continue;
 317
 318                 if (!SetupDiGetDeviceInterfaceDetail(device_info,&device_interface_data,
 319                                                      NULL, 0, &size, NULL)
 320                     && GetLastError() != ERROR_INSUFFICIENT_BUFFER)
 321                         continue;
 322
 323                 if (!(device_detail_data = malloc(size)))
 324                         continue;
 325                 device_detail_data->cbSize = sizeof(*device_detail_data);
 326                 if (!SetupDiGetDeviceInterfaceDetail(device_info,&device_interface_data,
 327                                                      device_detail_data, size, &size,
 328                                                      NULL)) {
 329                         free(device_detail_data);
 330                         continue;
 331                 }
 332
 333                 while (CM_Get_Parent(&dev_inst, dev_inst, 0) == CR_SUCCESS
 334                        && dev_inst != device_info_data.DevInst) { }
 335                 if (dev_inst != device_info_data.DevInst) {
 336                         free(device_detail_data);
 337                         continue;
 338                 }
 339
 340                 port->usb_bus = i + 1;
 341
 342                 host_controller_device = CreateFile(device_detail_data->DevicePath,
 343                                                     GENERIC_WRITE, FILE_SHARE_WRITE,
 344                                                     NULL, OPEN_EXISTING, 0, NULL);
 345                 if (host_controller_device != INVALID_HANDLE_VALUE) {
 346                         enumerate_host_controller(port, host_controller_device, dev_inst_match);
 347                         CloseHandle(host_controller_device);
 348                 }
 349                 free(device_detail_data);
 350         }
 351
 352         SetupDiDestroyDeviceInfoList(device_info);
 353         return;
 354 }
 355
 356 SP_PRIV enum sp_return get_port_details(struct sp_port *port)
 357 {
 358         /*
 359          * Description limited to 127 char, anything longer
 360          * would not be user friendly anyway.
 361          */
 362         char description[128];
 363         SP_DEVINFO_DATA device_info_data = { .cbSize = sizeof(device_info_data) };
 364         HDEVINFO device_info;
 365         int i;
 366
 367         device_info = SetupDiGetClassDevs(NULL, 0, 0,
 368                                           DIGCF_PRESENT | DIGCF_ALLCLASSES);
 369         if (device_info == INVALID_HANDLE_VALUE)
 370                 RETURN_FAIL("SetupDiGetClassDevs() failed");
 371
 372         for (i = 0; SetupDiEnumDeviceInfo(device_info, i, &device_info_data); i++) {
 373                 HKEY device_key;
 374                 DEVINST dev_inst;
 375                 char value[8], class[16];
 376                 DWORD size, type;
 377                 CONFIGRET cr;
 378
 379                 /* Check if this is the device we are looking for. */
 380                 device_key = SetupDiOpenDevRegKey(device_info, &device_info_data,
 381                                                   DICS_FLAG_GLOBAL, 0,
 382                                                   DIREG_DEV, KEY_QUERY_VALUE);
 383                 if (device_key == INVALID_HANDLE_VALUE)
 384                         continue;
 385                 size = sizeof(value);
 386                 if (RegQueryValueExA(device_key, "PortName", NULL, &type, (LPBYTE)value,
 387                                      &size) != ERROR_SUCCESS || type != REG_SZ) {
 388                         RegCloseKey(device_key);
 389                         continue;
 390                 }
 391                 RegCloseKey(device_key);
 392                 value[sizeof(value) - 1] = 0;
 393                 if (strcmp(value, port->name))
 394                         continue;
 395
 396                 /* Check port transport type. */
 397                 dev_inst = device_info_data.DevInst;
 398                 size = sizeof(class);
 399                 cr = CR_FAILURE;
 400                 while (CM_Get_Parent(&dev_inst, dev_inst, 0) == CR_SUCCESS &&
 401                        (cr = CM_Get_DevNode_Registry_PropertyA(dev_inst,
 402                                  CM_DRP_CLASS, 0, class, &size, 0)) != CR_SUCCESS) { }
 403                 if (cr == CR_SUCCESS) {
 404                         if (!strcmp(class, "USB"))
 405                                 port->transport = SP_TRANSPORT_USB;
 406                 }
 407
 408                 /* Get port description (friendly name). */
 409                 dev_inst = device_info_data.DevInst;
 410                 size = sizeof(description);
 411                 while ((cr = CM_Get_DevNode_Registry_PropertyA(dev_inst,
 412                           CM_DRP_FRIENDLYNAME, 0, description, &size, 0)) != CR_SUCCESS
 413                        && CM_Get_Parent(&dev_inst, dev_inst, 0) == CR_SUCCESS) { }
 414                 if (cr == CR_SUCCESS)
 415                         port->description = strdup(description);
 416
 417                 /* Get more informations for USB connected ports. */
 418                 if (port->transport == SP_TRANSPORT_USB) {
 419                         char usb_path[MAX_USB_PATH] = "", tmp[MAX_USB_PATH];
 420                         char device_id[MAX_DEVICE_ID_LEN];
 421
 422                         /* Recurse over parents to build the USB device path. */
 423                         dev_inst = device_info_data.DevInst;
 424                         do {
 425                                 /* Verify that this layer of the tree is USB related. */
 426                                 if (CM_Get_Device_IDA(dev_inst, device_id,
 427                                                       sizeof(device_id), 0) != CR_SUCCESS
 428                                     || strncmp(device_id, "USB\\", 4))
 429                                         continue;
 430
 431                                 /* Discard one layer for composite devices. */
 432                                 char compat_ids[512], *p = compat_ids;
 433                                 size = sizeof(compat_ids);
 434                                 if (CM_Get_DevNode_Registry_PropertyA(dev_inst,
 435                                                                       CM_DRP_COMPATIBLEIDS, 0,
 436                                                                       &compat_ids,
 437                                                                       &size, 0) == CR_SUCCESS) {
 438                                         while (*p) {
 439                                                 if (!strncmp(p, "USB\\COMPOSITE", 13))
 440                                                         break;
 441                                                 p += strlen(p) + 1;
 442                                         }
 443                                         if (*p)
 444                                                 continue;
 445                                 }
 446
 447                                 /* Stop the recursion when reaching the USB root. */
 448                                 if (!strncmp(device_id, "USB\\ROOT", 8))
 449                                         break;
 450
 451                                 /* Prepend the address of current USB layer to the USB path. */
 452                                 DWORD address;
 453                                 size = sizeof(address);
 454                                 if (CM_Get_DevNode_Registry_PropertyA(dev_inst, CM_DRP_ADDRESS,
 455                                                         0, &address, &size, 0) == CR_SUCCESS) {
 456                                         strcpy(tmp, usb_path);
 457                                         snprintf(usb_path, sizeof(usb_path), "%d%s%s",
 458                                                  (int)address, *tmp ? "." : "", tmp);
 459                                 }
 460                         } while (CM_Get_Parent(&dev_inst, dev_inst, 0) == CR_SUCCESS);
 461
 462                         port->usb_path = strdup(usb_path);
 463
 464                         /* Wake up the USB device to be able to read string descriptor. */
 465                         char *escaped_port_name;
 466                         HANDLE handle;
 467                         if (!(escaped_port_name = malloc(strlen(port->name) + 5)))
 468                                 RETURN_ERROR(SP_ERR_MEM, "Escaped port name malloc failed");
 469                         sprintf(escaped_port_name, "\\\\.\\%s", port->name);
 470                         handle = CreateFileA(escaped_port_name, GENERIC_READ, 0, 0,
 471                                              OPEN_EXISTING,
 472                                              FILE_ATTRIBUTE_NORMAL|FILE_FLAG_OVERLAPPED, 0);
 473                         free(escaped_port_name);
 474                         CloseHandle(handle);
 475
 476                         /* Retrieve USB device details from the device descriptor. */
 477                         get_usb_details(port, device_info_data.DevInst);
 478                 }
 479                 break;
 480         }
 481
 482         SetupDiDestroyDeviceInfoList(device_info);
 483
 484         RETURN_OK();
 485 }
 486
 487 SP_PRIV enum sp_return list_ports(struct sp_port ***list)
 488 {
 489         HKEY key;
 490         TCHAR *value, *data;
 491         DWORD max_value_len, max_data_size, max_data_len;
 492         DWORD value_len, data_size, data_len;
 493         DWORD type, index = 0;
 494         LSTATUS result;
 495         char *name;
 496         int name_len;
 497         int ret = SP_OK;
 498
 499         DEBUG("Opening registry key");
 500         if ((result = RegOpenKeyEx(HKEY_LOCAL_MACHINE, _T("HARDWARE\\DEVICEMAP\\SERIALCOMM"),
 501                         0, KEY_QUERY_VALUE, &key)) != ERROR_SUCCESS) {
 502                 /* It's possible for this key to not exist if there are no serial ports
 503                  * at all. In that case we're done. Return a failure for any other error. */
 504                 if (result != ERROR_FILE_NOT_FOUND) {
 505                         SetLastError(result);
 506                         SET_FAIL(ret, "RegOpenKeyEx() failed");
 507                 }
 508                 goto out_done;
 509         }
 510         DEBUG("Querying registry key value and data sizes");
 511         if ((result = RegQueryInfoKey(key, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
 512                                 &max_value_len, &max_data_size, NULL, NULL)) != ERROR_SUCCESS) {
 513                 SetLastError(result);
 514                 SET_FAIL(ret, "RegQueryInfoKey() failed");
 515                 goto out_close;
 516         }
 517         max_data_len = max_data_size / sizeof(TCHAR);
 518         if (!(value = malloc((max_value_len + 1) * sizeof(TCHAR)))) {
 519                 SET_ERROR(ret, SP_ERR_MEM, "Registry value malloc failed");
 520                 goto out_close;
 521         }
 522         if (!(data = malloc((max_data_len + 1) * sizeof(TCHAR)))) {
 523                 SET_ERROR(ret, SP_ERR_MEM, "Registry data malloc failed");
 524                 goto out_free_value;
 525         }
 526         DEBUG("Iterating over values");
 527         while (
 528                 value_len = max_value_len + 1,
 529                 data_size = max_data_size,
 530                 RegEnumValue(key, index, value, &value_len,
 531                         NULL, &type, (LPBYTE)data, &data_size) == ERROR_SUCCESS)
 532         {
 533                 if (type == REG_SZ) {
 534                         data_len = data_size / sizeof(TCHAR);
 535                         data[data_len] = '\0';
 536 #ifdef UNICODE
 537                         name_len = WideCharToMultiByte(CP_ACP, 0, data, -1, NULL, 0, NULL, NULL);
 538 #else
 539                         name_len = data_len + 1;
 540 #endif
 541                         if (!(name = malloc(name_len))) {
 542                                 SET_ERROR(ret, SP_ERR_MEM, "Registry port name malloc failed");
 543                                 goto out;
 544                         }
 545 #ifdef UNICODE
 546                         WideCharToMultiByte(CP_ACP, 0, data, -1, name, name_len, NULL, NULL);
 547 #else
 548                         strcpy(name, data);
 549 #endif
 550                         DEBUG_FMT("Found port %s", name);
 551                         if (!(*list = list_append(*list, name))) {
 552                                 SET_ERROR(ret, SP_ERR_MEM, "List append failed");
 553                                 free(name);
 554                                 goto out;
 555                         }
 556                         free(name);
 557                 }
 558                 index++;
 559         }
 560 out:
 561         free(data);
 562 out_free_value:
 563         free(value);
 564 out_close:
 565         RegCloseKey(key);
 566 out_done:
 567
 568         return ret;
 569 }