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 <config.h>
  22 #include "libserialport.h"
  23 #include "libserialport_internal.h"
  24
  25 /* USB path is a string of at most 8 decimal numbers < 128 separated by dots. */
  26 #define MAX_USB_PATH ((8 * 3) + (7 * 1) + 1)
  27
  28 static void enumerate_hub(struct sp_port *port, const char *hub_name,
  29                           const char *parent_path, DEVINST dev_inst);
  30
  31 static char *wc_to_utf8(PWCHAR wc_buffer, ULONG wc_bytes)
  32 {
  33         ULONG wc_length = wc_bytes / sizeof(WCHAR);
  34         ULONG utf8_bytes;
  35         WCHAR *wc_str = NULL;
  36         char *utf8_str = NULL;
  37
  38         /* Allocate aligned wide char buffer */
  39         if (!(wc_str = malloc((wc_length + 1) * sizeof(WCHAR))))
  40                 goto wc_to_utf8_end;
  41
  42         /* Zero-terminate the wide char string. */
  43         memcpy(wc_str, wc_buffer, wc_bytes);
  44         wc_str[wc_length] = 0;
  45
  46         /* Compute the size of the UTF-8 converted string. */
  47         if (!(utf8_bytes = WideCharToMultiByte(CP_ACP, WC_NO_BEST_FIT_CHARS, wc_str, -1,
  48                                          NULL, 0, NULL, NULL)))
  49                 goto wc_to_utf8_end;
  50
  51         /* Allocate UTF-8 output buffer. */
  52         if (!(utf8_str = malloc(utf8_bytes)))
  53                 goto wc_to_utf8_end;
  54
  55         /* Actually converted to UTF-8. */
  56         if (!WideCharToMultiByte(CP_ACP, WC_NO_BEST_FIT_CHARS, wc_str, -1,
  57                                  utf8_str, utf8_bytes, NULL, NULL)) {
  58                 free(utf8_str);
  59                 utf8_str = NULL;
  60                 goto wc_to_utf8_end;
  61         }
  62
  63 wc_to_utf8_end:
  64         if (wc_str)
  65                 free(wc_str);
  66
  67         return utf8_str;
  68 }
  69
  70 static char *get_root_hub_name(HANDLE host_controller)
  71 {
  72         USB_ROOT_HUB_NAME root_hub_name;
  73         PUSB_ROOT_HUB_NAME root_hub_name_wc;
  74         char *root_hub_name_utf8;
  75         ULONG size = 0;
  76
  77         /* Compute the size of the root hub name string. */
  78         if (!DeviceIoControl(host_controller, IOCTL_USB_GET_ROOT_HUB_NAME, 0, 0,
  79                              &root_hub_name, sizeof(root_hub_name), &size, NULL))
  80                 return NULL;
  81
  82         /* Allocate wide char root hub name string. */
  83         size = root_hub_name.ActualLength;
  84         if (!(root_hub_name_wc = malloc(size)))
  85                 return NULL;
  86
  87         /* Actually get the root hub name string. */
  88         if (!DeviceIoControl(host_controller, IOCTL_USB_GET_ROOT_HUB_NAME,
  89                              NULL, 0, root_hub_name_wc, size, &size, NULL)) {
  90                 free(root_hub_name_wc);
  91                 return NULL;
  92         }
  93
  94         /* Convert the root hub name string to UTF-8. */
  95         root_hub_name_utf8 = wc_to_utf8(root_hub_name_wc->RootHubName, size - offsetof(USB_ROOT_HUB_NAME, RootHubName));
  96         free(root_hub_name_wc);
  97         return root_hub_name_utf8;
  98 }
  99
 100 static char *get_external_hub_name(HANDLE hub, ULONG connection_index)
 101 {
 102         USB_NODE_CONNECTION_NAME ext_hub_name;
 103         PUSB_NODE_CONNECTION_NAME ext_hub_name_wc;
 104         char *ext_hub_name_utf8;
 105         ULONG size;
 106
 107         /* Compute the size of the external hub name string. */
 108         ext_hub_name.ConnectionIndex = connection_index;
 109         if (!DeviceIoControl(hub, IOCTL_USB_GET_NODE_CONNECTION_NAME,
 110                              &ext_hub_name, sizeof(ext_hub_name),
 111                              &ext_hub_name, sizeof(ext_hub_name), &size, NULL))
 112                 return NULL;
 113
 114         /* Allocate wide char external hub name string. */
 115         size = ext_hub_name.ActualLength;
 116         if (size <= sizeof(ext_hub_name)
 117             || !(ext_hub_name_wc = malloc(size)))
 118                 return NULL;
 119
 120         /* Get the name of the external hub attached to the specified port. */
 121         ext_hub_name_wc->ConnectionIndex = connection_index;
 122         if (!DeviceIoControl(hub, IOCTL_USB_GET_NODE_CONNECTION_NAME,
 123                              ext_hub_name_wc, size,
 124                              ext_hub_name_wc, size, &size, NULL)) {
 125                 free(ext_hub_name_wc);
 126                 return NULL;
 127         }
 128
 129         /* Convert the external hub name string to UTF-8. */
 130         ext_hub_name_utf8 = wc_to_utf8(ext_hub_name_wc->NodeName, size - offsetof(USB_NODE_CONNECTION_NAME, NodeName));
 131         free(ext_hub_name_wc);
 132         return ext_hub_name_utf8;
 133 }
 134
 135 static char *get_string_descriptor(HANDLE hub_device, ULONG connection_index,
 136                                    UCHAR descriptor_index)
 137 {
 138         char desc_req_buf[sizeof(USB_DESCRIPTOR_REQUEST) +
 139                           MAXIMUM_USB_STRING_LENGTH] = { 0 };
 140         PUSB_DESCRIPTOR_REQUEST desc_req = (void *)desc_req_buf;
 141         PUSB_STRING_DESCRIPTOR desc = (void *)(desc_req + 1);
 142         ULONG size = sizeof(desc_req_buf);
 143
 144         desc_req->ConnectionIndex = connection_index;
 145         desc_req->SetupPacket.wValue = (USB_STRING_DESCRIPTOR_TYPE << 8)
 146                                        | descriptor_index;
 147         desc_req->SetupPacket.wIndex = 0;
 148         desc_req->SetupPacket.wLength = size - sizeof(*desc_req);
 149
 150         if (!DeviceIoControl(hub_device,
 151                              IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION,
 152                              desc_req, size, desc_req, size, &size, NULL)
 153             || size < 2
 154             || desc->bDescriptorType != USB_STRING_DESCRIPTOR_TYPE
 155             || desc->bLength != size - sizeof(*desc_req)
 156             || desc->bLength % 2)
 157                 return NULL;
 158
 159         return wc_to_utf8(desc->bString, desc->bLength - offsetof(USB_STRING_DESCRIPTOR, bString));
 160 }
 161
 162 static void enumerate_hub_ports(struct sp_port *port, HANDLE hub_device,
 163                                 ULONG nb_ports, const char *parent_path, DEVINST dev_inst)
 164 {
 165         char path[MAX_USB_PATH];
 166         ULONG index = 0;
 167
 168         for (index = 1; index <= nb_ports; index++) {
 169                 PUSB_NODE_CONNECTION_INFORMATION_EX connection_info_ex;
 170                 ULONG size = sizeof(*connection_info_ex) + (30 * sizeof(USB_PIPE_INFO));
 171
 172                 if (!(connection_info_ex = malloc(size)))
 173                         break;
 174
 175                 connection_info_ex->ConnectionIndex = index;
 176                 if (!DeviceIoControl(hub_device,
 177                                      IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX,
 178                                      connection_info_ex, size,
 179                                      connection_info_ex, size, &size, NULL)) {
 180                         /*
 181                          * Try to get CONNECTION_INFORMATION if
 182                          * CONNECTION_INFORMATION_EX did not work.
 183                          */
 184                         PUSB_NODE_CONNECTION_INFORMATION connection_info;
 185
 186                         size = sizeof(*connection_info) + (30 * sizeof(USB_PIPE_INFO));
 187                         if (!(connection_info = malloc(size))) {
 188                                 free(connection_info_ex);
 189                                 continue;
 190                         }
 191                         connection_info->ConnectionIndex = index;
 192                         if (!DeviceIoControl(hub_device,
 193                                              IOCTL_USB_GET_NODE_CONNECTION_INFORMATION,
 194                                              connection_info, size,
 195                                              connection_info, size, &size, NULL)) {
 196                                 free(connection_info);
 197                                 free(connection_info_ex);
 198                                 continue;
 199                         }
 200
 201                         connection_info_ex->ConnectionIndex = connection_info->ConnectionIndex;
 202                         connection_info_ex->DeviceDescriptor = connection_info->DeviceDescriptor;
 203                         connection_info_ex->DeviceIsHub = connection_info->DeviceIsHub;
 204                         connection_info_ex->DeviceAddress = connection_info->DeviceAddress;
 205                         free(connection_info);
 206                 }
 207
 208                 if (connection_info_ex->DeviceIsHub) {
 209                         /* Recursively enumerate external hub. */
 210                         PCHAR ext_hub_name;
 211                         if ((ext_hub_name = get_external_hub_name(hub_device, index))) {
 212                                 snprintf(path, sizeof(path), "%s%ld.",
 213                                          parent_path, connection_info_ex->ConnectionIndex);
 214                                 enumerate_hub(port, ext_hub_name, path, dev_inst);
 215                         }
 216                         free(connection_info_ex);
 217                 } else {
 218                         snprintf(path, sizeof(path), "%s%ld",
 219                                  parent_path, connection_info_ex->ConnectionIndex);
 220
 221                         /* Check if this device is the one we search for. */
 222                         if (strcmp(path, port->usb_path)) {
 223                                 free(connection_info_ex);
 224                                 continue;
 225                         }
 226
 227                         /* Finally grab detailed information regarding the device. */
 228                         port->usb_address = connection_info_ex->DeviceAddress + 1;
 229                         port->usb_vid = connection_info_ex->DeviceDescriptor.idVendor;
 230                         port->usb_pid = connection_info_ex->DeviceDescriptor.idProduct;
 231
 232                         if (connection_info_ex->DeviceDescriptor.iManufacturer)
 233                                 port->usb_manufacturer = get_string_descriptor(hub_device, index,
 234                                            connection_info_ex->DeviceDescriptor.iManufacturer);
 235                         if (connection_info_ex->DeviceDescriptor.iProduct)
 236                                 port->usb_product = get_string_descriptor(hub_device, index,
 237                                            connection_info_ex->DeviceDescriptor.iProduct);
 238                         if (connection_info_ex->DeviceDescriptor.iSerialNumber) {
 239                                 port->usb_serial = get_string_descriptor(hub_device, index,
 240                                            connection_info_ex->DeviceDescriptor.iSerialNumber);
 241                                 if (port->usb_serial == NULL) {
 242                                         //composite device, get the parent's serial number
 243                                         char device_id[MAX_DEVICE_ID_LEN];
 244                                         if (CM_Get_Parent(&dev_inst, dev_inst, 0) == CR_SUCCESS) {
 245                                                 if (CM_Get_Device_IDA(dev_inst, device_id, sizeof(device_id), 0) == CR_SUCCESS)
 246                                                         port->usb_serial = strdup(strrchr(device_id, '\\')+1);
 247                                         }
 248                                 }
 249                         }
 250
 251                         free(connection_info_ex);
 252                         break;
 253                 }
 254         }
 255 }
 256
 257 static void enumerate_hub(struct sp_port *port, const char *hub_name,
 258                           const char *parent_path, DEVINST dev_inst)
 259 {
 260         USB_NODE_INFORMATION hub_info;
 261         HANDLE hub_device;
 262         ULONG size = sizeof(hub_info);
 263         char *device_name;
 264
 265         /* Open the hub with its full name. */
 266         if (!(device_name = malloc(strlen("\\\\.\\") + strlen(hub_name) + 1)))
 267                 return;
 268         strcpy(device_name, "\\\\.\\");
 269         strcat(device_name, hub_name);
 270         hub_device = CreateFile(device_name, GENERIC_WRITE, FILE_SHARE_WRITE,
 271                                 NULL, OPEN_EXISTING, 0, NULL);
 272         free(device_name);
 273         if (hub_device == INVALID_HANDLE_VALUE)
 274                 return;
 275
 276         /* Get the number of ports of the hub. */
 277         if (DeviceIoControl(hub_device, IOCTL_USB_GET_NODE_INFORMATION,
 278                             &hub_info, size, &hub_info, size, &size, NULL))
 279                 /* Enumerate the ports of the hub. */
 280                 enumerate_hub_ports(port, hub_device,
 281                    hub_info.u.HubInformation.HubDescriptor.bNumberOfPorts, parent_path, dev_inst);
 282
 283         CloseHandle(hub_device);
 284 }
 285
 286 static void enumerate_host_controller(struct sp_port *port,
 287                                       HANDLE host_controller_device,
 288                                       DEVINST dev_inst)
 289 {
 290         char *root_hub_name;
 291
 292         if ((root_hub_name = get_root_hub_name(host_controller_device))) {
 293                 enumerate_hub(port, root_hub_name, "", dev_inst);
 294                 free(root_hub_name);
 295         }
 296 }
 297
 298 static void get_usb_details(struct sp_port *port, DEVINST dev_inst_match)
 299 {
 300         HDEVINFO device_info;
 301         SP_DEVINFO_DATA device_info_data;
 302         ULONG i, size = 0;
 303
 304         device_info = SetupDiGetClassDevs(&GUID_CLASS_USB_HOST_CONTROLLER, NULL, NULL,
 305                                           DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
 306         device_info_data.cbSize = sizeof(device_info_data);
 307
 308         for (i = 0; SetupDiEnumDeviceInfo(device_info, i, &device_info_data); i++) {
 309                 SP_DEVICE_INTERFACE_DATA device_interface_data;
 310                 PSP_DEVICE_INTERFACE_DETAIL_DATA device_detail_data;
 311                 DEVINST dev_inst = dev_inst_match;
 312                 HANDLE host_controller_device;
 313
 314                 device_interface_data.cbSize = sizeof(device_interface_data);
 315                 if (!SetupDiEnumDeviceInterfaces(device_info, 0,
 316                                                  &GUID_CLASS_USB_HOST_CONTROLLER,
 317                                                  i, &device_interface_data))
 318                         continue;
 319
 320                 if (!SetupDiGetDeviceInterfaceDetail(device_info,&device_interface_data,
 321                                                      NULL, 0, &size, NULL)
 322                     && GetLastError() != ERROR_INSUFFICIENT_BUFFER)
 323                         continue;
 324
 325                 if (!(device_detail_data = malloc(size)))
 326                         continue;
 327                 device_detail_data->cbSize = sizeof(*device_detail_data);
 328                 if (!SetupDiGetDeviceInterfaceDetail(device_info,&device_interface_data,
 329                                                      device_detail_data, size, &size,
 330                                                      NULL)) {
 331                         free(device_detail_data);
 332                         continue;
 333                 }
 334
 335                 while (CM_Get_Parent(&dev_inst, dev_inst, 0) == CR_SUCCESS
 336                        && dev_inst != device_info_data.DevInst) { }
 337                 if (dev_inst != device_info_data.DevInst) {
 338                         free(device_detail_data);
 339                         continue;
 340                 }
 341
 342                 port->usb_bus = i + 1;
 343
 344                 host_controller_device = CreateFile(device_detail_data->DevicePath,
 345                                                     GENERIC_WRITE, FILE_SHARE_WRITE,
 346                                                     NULL, OPEN_EXISTING, 0, NULL);
 347                 if (host_controller_device != INVALID_HANDLE_VALUE) {
 348                         enumerate_host_controller(port, host_controller_device, dev_inst_match);
 349                         CloseHandle(host_controller_device);
 350                 }
 351                 free(device_detail_data);
 352         }
 353
 354         SetupDiDestroyDeviceInfoList(device_info);
 355         return;
 356 }
 357
 358 SP_PRIV enum sp_return get_port_details(struct sp_port *port)
 359 {
 360         /*
 361          * Description limited to 127 char, anything longer
 362          * would not be user friendly anyway.
 363          */
 364         char description[128];
 365         SP_DEVINFO_DATA device_info_data = { .cbSize = sizeof(device_info_data) };
 366         HDEVINFO device_info;
 367         int i;
 368
 369         device_info = SetupDiGetClassDevs(NULL, 0, 0,
 370                                           DIGCF_PRESENT | DIGCF_ALLCLASSES);
 371         if (device_info == INVALID_HANDLE_VALUE)
 372                 RETURN_FAIL("SetupDiGetClassDevs() failed");
 373
 374         for (i = 0; SetupDiEnumDeviceInfo(device_info, i, &device_info_data); i++) {
 375                 HKEY device_key;
 376                 DEVINST dev_inst;
 377                 char value[8], class[16];
 378                 DWORD size, type;
 379                 CONFIGRET cr;
 380
 381                 /* Check if this is the device we are looking for. */
 382                 device_key = SetupDiOpenDevRegKey(device_info, &device_info_data,
 383                                                   DICS_FLAG_GLOBAL, 0,
 384                                                   DIREG_DEV, KEY_QUERY_VALUE);
 385                 if (device_key == INVALID_HANDLE_VALUE)
 386                         continue;
 387                 size = sizeof(value);
 388                 if (RegQueryValueExA(device_key, "PortName", NULL, &type, (LPBYTE)value,
 389                                      &size) != ERROR_SUCCESS || type != REG_SZ) {
 390                         RegCloseKey(device_key);
 391                         continue;
 392                 }
 393                 RegCloseKey(device_key);
 394                 value[sizeof(value) - 1] = 0;
 395                 if (strcmp(value, port->name))
 396                         continue;
 397
 398                 /* Check port transport type. */
 399                 dev_inst = device_info_data.DevInst;
 400                 size = sizeof(class);
 401                 cr = CR_FAILURE;
 402                 while (CM_Get_Parent(&dev_inst, dev_inst, 0) == CR_SUCCESS &&
 403                        (cr = CM_Get_DevNode_Registry_PropertyA(dev_inst,
 404                                  CM_DRP_CLASS, 0, class, &size, 0)) != CR_SUCCESS) { }
 405                 if (cr == CR_SUCCESS) {
 406                         if (!strcmp(class, "USB"))
 407                                 port->transport = SP_TRANSPORT_USB;
 408                 }
 409
 410                 /* Get port description (friendly name). */
 411                 dev_inst = device_info_data.DevInst;
 412                 size = sizeof(description);
 413                 while ((cr = CM_Get_DevNode_Registry_PropertyA(dev_inst,
 414                           CM_DRP_FRIENDLYNAME, 0, description, &size, 0)) != CR_SUCCESS
 415                        && CM_Get_Parent(&dev_inst, dev_inst, 0) == CR_SUCCESS) { }
 416                 if (cr == CR_SUCCESS)
 417                         port->description = strdup(description);
 418
 419                 /* Get more informations for USB connected ports. */
 420                 if (port->transport == SP_TRANSPORT_USB) {
 421                         char usb_path[MAX_USB_PATH] = "", tmp[MAX_USB_PATH];
 422                         char device_id[MAX_DEVICE_ID_LEN];
 423
 424                         /* Recurse over parents to build the USB device path. */
 425                         dev_inst = device_info_data.DevInst;
 426                         do {
 427                                 /* Verify that this layer of the tree is USB related. */
 428                                 if (CM_Get_Device_IDA(dev_inst, device_id,
 429                                                       sizeof(device_id), 0) != CR_SUCCESS
 430                                     || strncmp(device_id, "USB\\", 4))
 431                                         continue;
 432
 433                                 /* Discard one layer for composite devices. */
 434                                 char compat_ids[512], *p = compat_ids;
 435                                 size = sizeof(compat_ids);
 436                                 if (CM_Get_DevNode_Registry_PropertyA(dev_inst,
 437                                                                       CM_DRP_COMPATIBLEIDS, 0,
 438                                                                       &compat_ids,
 439                                                                       &size, 0) == CR_SUCCESS) {
 440                                         while (*p) {
 441                                                 if (!strncmp(p, "USB\\COMPOSITE", 13))
 442                                                         break;
 443                                                 p += strlen(p) + 1;
 444                                         }
 445                                         if (*p)
 446                                                 continue;
 447                                 }
 448
 449                                 /* Stop the recursion when reaching the USB root. */
 450                                 if (!strncmp(device_id, "USB\\ROOT", 8))
 451                                         break;
 452
 453                                 /* Prepend the address of current USB layer to the USB path. */
 454                                 DWORD address;
 455                                 size = sizeof(address);
 456                                 if (CM_Get_DevNode_Registry_PropertyA(dev_inst, CM_DRP_ADDRESS,
 457                                                         0, &address, &size, 0) == CR_SUCCESS) {
 458                                         strcpy(tmp, usb_path);
 459                                         snprintf(usb_path, sizeof(usb_path), "%d%s%s",
 460                                                  (int)address, *tmp ? "." : "", tmp);
 461                                 }
 462                         } while (CM_Get_Parent(&dev_inst, dev_inst, 0) == CR_SUCCESS);
 463
 464                         port->usb_path = strdup(usb_path);
 465
 466                         /* Wake up the USB device to be able to read string descriptor. */
 467                         char *escaped_port_name;
 468                         HANDLE handle;
 469                         if (!(escaped_port_name = malloc(strlen(port->name) + 5)))
 470                                 RETURN_ERROR(SP_ERR_MEM, "Escaped port name malloc failed");
 471                         sprintf(escaped_port_name, "\\\\.\\%s", port->name);
 472                         handle = CreateFile(escaped_port_name, GENERIC_READ, 0, 0,
 473                                             OPEN_EXISTING,
 474                                             FILE_ATTRIBUTE_NORMAL|FILE_FLAG_OVERLAPPED, 0);
 475                         free(escaped_port_name);
 476                         CloseHandle(handle);
 477
 478                         /* Retrieve USB device details from the device descriptor. */
 479                         get_usb_details(port, device_info_data.DevInst);
 480                 }
 481                 break;
 482         }
 483
 484         SetupDiDestroyDeviceInfoList(device_info);
 485
 486         RETURN_OK();
 487 }
 488
 489 SP_PRIV enum sp_return list_ports(struct sp_port ***list)
 490 {
 491         HKEY key;
 492         TCHAR *value, *data;
 493         DWORD max_value_len, max_data_size, max_data_len;
 494         DWORD value_len, data_size, data_len;
 495         DWORD type, index = 0;
 496         LSTATUS result;
 497         char *name;
 498         int name_len;
 499         int ret = SP_OK;
 500
 501         DEBUG("Opening registry key");
 502         if ((result = RegOpenKeyEx(HKEY_LOCAL_MACHINE, _T("HARDWARE\\DEVICEMAP\\SERIALCOMM"),
 503                         0, KEY_QUERY_VALUE, &key)) != ERROR_SUCCESS) {
 504                 /* It's possible for this key to not exist if there are no serial ports
 505                  * at all. In that case we're done. Return a failure for any other error. */
 506                 if (result != ERROR_FILE_NOT_FOUND) {
 507                         SetLastError(result);
 508                         SET_FAIL(ret, "RegOpenKeyEx() failed");
 509                 }
 510                 goto out_done;
 511         }
 512         DEBUG("Querying registry key value and data sizes");
 513         if ((result = RegQueryInfoKey(key, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
 514                                 &max_value_len, &max_data_size, NULL, NULL)) != ERROR_SUCCESS) {
 515                 SetLastError(result);
 516                 SET_FAIL(ret, "RegQueryInfoKey() failed");
 517                 goto out_close;
 518         }
 519         max_data_len = max_data_size / sizeof(TCHAR);
 520         if (!(value = malloc((max_value_len + 1) * sizeof(TCHAR)))) {
 521                 SET_ERROR(ret, SP_ERR_MEM, "Registry value malloc failed");
 522                 goto out_close;
 523         }
 524         if (!(data = malloc((max_data_len + 1) * sizeof(TCHAR)))) {
 525                 SET_ERROR(ret, SP_ERR_MEM, "Registry data malloc failed");
 526                 goto out_free_value;
 527         }
 528         DEBUG("Iterating over values");
 529         while (
 530                 value_len = max_value_len + 1,
 531                 data_size = max_data_size,
 532                 RegEnumValue(key, index, value, &value_len,
 533                         NULL, &type, (LPBYTE)data, &data_size) == ERROR_SUCCESS)
 534         {
 535                 if (type == REG_SZ) {
 536                         data_len = data_size / sizeof(TCHAR);
 537                         data[data_len] = '\0';
 538 #ifdef UNICODE
 539                         name_len = WideCharToMultiByte(CP_ACP, 0, data, -1, NULL, 0, NULL, NULL);
 540 #else
 541                         name_len = data_len + 1;
 542 #endif
 543                         if (!(name = malloc(name_len))) {
 544                                 SET_ERROR(ret, SP_ERR_MEM, "Registry port name malloc failed");
 545                                 goto out;
 546                         }
 547 #ifdef UNICODE
 548                         WideCharToMultiByte(CP_ACP, 0, data, -1, name, name_len, NULL, NULL);
 549 #else
 550                         strcpy(name, data);
 551 #endif
 552                         DEBUG_FMT("Found port %s", name);
 553                         if (!(*list = list_append(*list, name))) {
 554                                 SET_ERROR(ret, SP_ERR_MEM, "List append failed");
 555                                 free(name);
 556                                 goto out;
 557                         }
 558                         free(name);
 559                 }
 560                 index++;
 561         }
 562 out:
 563         free(data);
 564 out_free_value:
 565         free(value);
 566 out_close:
 567         RegCloseKey(key);
 568 out_done:
 569
 570         return ret;
 571 }