git.ozlabs.org Git - petitboot/blob - ui/ncurses/nc-config.c

   1 /*
   2  *  Copyright (C) 2013 IBM Corporation
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; version 2 of the License.
   7  *
   8  *  This program is distributed in the hope that it will be useful,
   9  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  *  GNU General Public License for more details.
  12  *
  13  *  You should have received a copy of the GNU General Public License
  14  *  along with this program; if not, write to the Free Software
  15  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  16  */
  17
  18 #if defined(HAVE_CONFIG_H)
  19 #include "config.h"
  20 #endif
  21
  22 #include <errno.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25
  26 #include <pb-config/pb-config.h>
  27 #include <talloc/talloc.h>
  28 #include <types/types.h>
  29 #include <log/log.h>
  30
  31 #include "nc-cui.h"
  32 #include "nc-config.h"
  33 #include "nc-widgets.h"
  34
  35 #define N_FIELDS        23
  36
  37 enum net_conf_type {
  38         NET_CONF_TYPE_DHCP_ALL,
  39         NET_CONF_TYPE_DHCP_ONE,
  40         NET_CONF_TYPE_STATIC,
  41 };
  42
  43 struct config_screen {
  44         struct nc_scr           scr;
  45         struct cui              *cui;
  46         struct nc_widgetset     *widgetset;
  47         WINDOW                  *pad;
  48
  49         bool                    exit;
  50         void                    (*on_exit)(struct cui *);
  51
  52         int                     scroll_y;
  53
  54         int                     label_x;
  55         int                     field_x;
  56         int                     network_config_y;
  57
  58         enum net_conf_type      net_conf_type;
  59
  60         struct {
  61                 struct nc_widget_checkbox       *autoboot_f;
  62                 struct nc_widget_label          *autoboot_l;
  63                 struct nc_widget_textbox        *timeout_f;
  64                 struct nc_widget_label          *timeout_l;
  65                 struct nc_widget_label          *timeout_help_l;
  66
  67                 struct nc_widget_label          *network_l;
  68                 struct nc_widget_select         *network_f;
  69
  70                 struct nc_widget_label          *iface_l;
  71                 struct nc_widget_select         *iface_f;
  72                 struct nc_widget_label          *ip_addr_l;
  73                 struct nc_widget_textbox        *ip_addr_f;
  74                 struct nc_widget_label          *ip_mask_l;
  75                 struct nc_widget_textbox        *ip_mask_f;
  76                 struct nc_widget_label          *ip_addr_mask_help_l;
  77                 struct nc_widget_label          *gateway_l;
  78                 struct nc_widget_textbox        *gateway_f;
  79                 struct nc_widget_label          *gateway_help_l;
  80                 struct nc_widget_label          *dns_l;
  81                 struct nc_widget_textbox        *dns_f;
  82                 struct nc_widget_label          *dns_dhcp_help_l;
  83                 struct nc_widget_label          *dns_help_l;
  84
  85                 struct nc_widget_button         *ok_b;
  86                 struct nc_widget_button         *cancel_b;
  87         } widgets;
  88 };
  89
  90 static struct config_screen *config_screen_from_scr(struct nc_scr *scr)
  91 {
  92         struct config_screen *config_screen;
  93
  94         assert(scr->sig == pb_config_screen_sig);
  95         config_screen = (struct config_screen *)
  96                 ((char *)scr - (size_t)&((struct config_screen *)0)->scr);
  97         assert(config_screen->scr.sig == pb_config_screen_sig);
  98         return config_screen;
  99 }
 100
 101 static void pad_refresh(struct config_screen *screen)
 102 {
 103         int y, x, rows, cols;
 104
 105         getmaxyx(screen->scr.sub_ncw, rows, cols);
 106         getbegyx(screen->scr.sub_ncw, y, x);
 107
 108         prefresh(screen->pad, screen->scroll_y, 0, y, x, rows, cols);
 109 }
 110
 111 static void config_screen_process_key(struct nc_scr *scr, int key)
 112 {
 113         struct config_screen *screen = config_screen_from_scr(scr);
 114         bool handled;
 115
 116         handled = widgetset_process_key(screen->widgetset, key);
 117         if (screen->exit)
 118                 screen->on_exit(screen->cui);
 119         else if (handled)
 120                 pad_refresh(screen);
 121 }
 122
 123 static void config_screen_resize(struct nc_scr *scr)
 124 {
 125         struct config_screen *screen = config_screen_from_scr(scr);
 126         (void)screen;
 127 }
 128
 129 static int config_screen_post(struct nc_scr *scr)
 130 {
 131         struct config_screen *screen = config_screen_from_scr(scr);
 132         widgetset_post(screen->widgetset);
 133         nc_scr_frame_draw(scr);
 134         redrawwin(scr->main_ncw);
 135         wrefresh(screen->scr.main_ncw);
 136         pad_refresh(screen);
 137         return 0;
 138 }
 139
 140 static int config_screen_unpost(struct nc_scr *scr)
 141 {
 142         struct config_screen *screen = config_screen_from_scr(scr);
 143         widgetset_unpost(screen->widgetset);
 144         return 0;
 145 }
 146
 147 struct nc_scr *config_screen_scr(struct config_screen *screen)
 148 {
 149         return &screen->scr;
 150 }
 151
 152 static int screen_process_form(struct config_screen *screen)
 153 {
 154         const struct system_info *sysinfo = screen->cui->sysinfo;
 155         enum net_conf_type net_conf_type;
 156         struct interface_config *iface;
 157         struct config *config;
 158         char *str, *end;
 159         int rc;
 160
 161         config = config_copy(screen, screen->cui->config);
 162
 163         config->autoboot_enabled =
 164                 widget_checkbox_get_value(screen->widgets.autoboot_f);
 165
 166
 167         str = widget_textbox_get_value(screen->widgets.timeout_f);
 168         if (str) {
 169                 unsigned long x;
 170                 errno = 0;
 171                 x = strtoul(str, &end, 10);
 172                 if (!errno && end != str)
 173                         config->autoboot_timeout_sec = x;
 174         }
 175
 176         net_conf_type = widget_select_get_value(screen->widgets.network_f);
 177
 178         /* if we don't have any network interfaces, prevent per-interface
 179          * configuration */
 180         if (sysinfo->n_interfaces == 0)
 181                 net_conf_type = NET_CONF_TYPE_DHCP_ALL;
 182
 183         if (net_conf_type == NET_CONF_TYPE_DHCP_ALL) {
 184                 config->network.n_interfaces = 0;
 185
 186         } else {
 187                 int idx;
 188
 189                 iface = talloc_zero(config, struct interface_config);
 190                 config->network.n_interfaces = 1;
 191                 config->network.interfaces = talloc_array(config,
 192                                 struct interface_config *, 1);
 193                 config->network.interfaces[0] = iface;
 194
 195                 /* copy hwaddr (from the sysinfo interface data) to
 196                  * the configuration */
 197                 idx = widget_select_get_value(screen->widgets.iface_f);
 198                 memcpy(iface->hwaddr, sysinfo->interfaces[idx]->hwaddr,
 199                                 sizeof(iface->hwaddr));
 200         }
 201
 202         if (net_conf_type == NET_CONF_TYPE_DHCP_ONE) {
 203                 iface->method = CONFIG_METHOD_DHCP;
 204         }
 205
 206         if (net_conf_type == NET_CONF_TYPE_STATIC) {
 207                 char *ip, *mask, *gateway;
 208
 209                 ip = widget_textbox_get_value(screen->widgets.ip_addr_f);
 210                 mask = widget_textbox_get_value(screen->widgets.ip_mask_f);
 211                 gateway = widget_textbox_get_value(screen->widgets.gateway_f);
 212
 213                 if (!ip || !*ip || !mask || !*mask) {
 214                         screen->scr.frame.status =
 215                                 "No IP / mask values are set";
 216                         nc_scr_frame_draw(&screen->scr);
 217                         talloc_free(config);
 218                         return -1;
 219                 }
 220
 221                 iface->method = CONFIG_METHOD_STATIC;
 222                 iface->static_config.address = talloc_asprintf(iface, "%s/%s",
 223                                 ip, mask);
 224                 iface->static_config.gateway = talloc_strdup(iface, gateway);
 225         }
 226
 227         str = widget_textbox_get_value(screen->widgets.dns_f);
 228         if (str && strlen(str)) {
 229                 char *dns, *tmp;
 230                 int i;
 231
 232                 for (;;) {
 233                         dns = strtok_r(str, " \t", &tmp);
 234
 235                         if (!dns)
 236                                 break;
 237
 238                         i = config->network.n_dns_servers++;
 239                         config->network.dns_servers = talloc_realloc(config,
 240                                         config->network.dns_servers,
 241                                         const char *,
 242                                         config->network.n_dns_servers);
 243                         config->network.dns_servers[i] =
 244                                 talloc_strdup(config, dns);
 245
 246                         str = NULL;
 247                 }
 248         }
 249
 250         rc = cui_send_config(screen->cui, config);
 251         talloc_free(config);
 252
 253         if (rc)
 254                 pb_log("cui_send_config failed!\n");
 255         else
 256                 pb_debug("config sent!\n");
 257
 258         return 0;
 259 }
 260
 261 static void ok_click(void *arg)
 262 {
 263         struct config_screen *screen = arg;
 264         if (screen_process_form(screen))
 265                 /* errors are written to the status line, so we'll need
 266                  * to refresh */
 267                 wrefresh(screen->scr.main_ncw);
 268         else
 269                 screen->exit = true;
 270 }
 271
 272 static void cancel_click(void *arg)
 273 {
 274         struct config_screen *screen = arg;
 275         screen->exit = true;
 276 }
 277
 278 static int layout_pair(struct config_screen *screen, int y,
 279                 struct nc_widget_label *label,
 280                 struct nc_widget *field)
 281 {
 282         struct nc_widget *label_w = widget_label_base(label);
 283         widget_move(label_w, y, screen->label_x);
 284         widget_move(field, y, screen->field_x);
 285         return max(widget_height(label_w), widget_height(field));
 286 }
 287
 288 static void config_screen_layout_widgets(struct config_screen *screen,
 289                 enum net_conf_type net_conf)
 290 {
 291         struct nc_widget *wl, *wf, *wh;
 292         int y, x, help_x;
 293         bool show;
 294
 295         y = 1;
 296         help_x = screen->field_x + 2 +
 297                 widget_width(widget_textbox_base(screen->widgets.dns_f));
 298
 299         y += layout_pair(screen, y, screen->widgets.autoboot_l,
 300                         widget_checkbox_base(screen->widgets.autoboot_f));
 301
 302         wf = widget_textbox_base(screen->widgets.timeout_f);
 303         widget_move(widget_label_base(screen->widgets.timeout_l),
 304                         y, screen->label_x);
 305         widget_move(wf, y, screen->field_x);
 306         widget_move(widget_label_base(screen->widgets.timeout_help_l),
 307                         y, screen->field_x + widget_width(wf) + 1);
 308
 309         y += 2;
 310
 311         y += layout_pair(screen, y, screen->widgets.network_l,
 312                         widget_select_base(screen->widgets.network_f));
 313
 314         y += 1;
 315
 316         /* conditionally show iface select */
 317         wl = widget_label_base(screen->widgets.iface_l);
 318         wf = widget_select_base(screen->widgets.iface_f);
 319
 320         show = net_conf == NET_CONF_TYPE_DHCP_ONE ||
 321                 net_conf == NET_CONF_TYPE_STATIC;
 322
 323         widget_set_visible(wl, show);
 324         widget_set_visible(wf, show);
 325
 326         if (show)
 327                 y += layout_pair(screen, y, screen->widgets.iface_l, wf) + 1;
 328
 329         /* conditionally show static IP params */
 330         show = net_conf == NET_CONF_TYPE_STATIC;
 331
 332         wl = widget_label_base(screen->widgets.ip_addr_l);
 333         wf = widget_textbox_base(screen->widgets.ip_addr_f);
 334         widget_set_visible(wl, show);
 335         widget_set_visible(wf, show);
 336         x = screen->field_x + widget_width(wf) + 1;
 337
 338         if (show)
 339                 layout_pair(screen, y, screen->widgets.ip_addr_l, wf);
 340
 341         wl = widget_label_base(screen->widgets.ip_mask_l);
 342         wf = widget_textbox_base(screen->widgets.ip_mask_f);
 343         widget_set_visible(wl, show);
 344         widget_set_visible(wf, show);
 345
 346         if (show) {
 347                 widget_move(wl, y, x);
 348                 widget_move(wf, y, x + 2);
 349         }
 350
 351         /* help for IP/mask */
 352         wh = widget_label_base(screen->widgets.ip_addr_mask_help_l);
 353         widget_set_visible(wh, show);
 354         if (show) {
 355                 widget_move(wh, y, help_x);
 356                 y++;
 357         }
 358
 359         wl = widget_label_base(screen->widgets.gateway_l);
 360         wf = widget_textbox_base(screen->widgets.gateway_f);
 361         wh = widget_label_base(screen->widgets.gateway_help_l);
 362         widget_set_visible(wl, show);
 363         widget_set_visible(wf, show);
 364         widget_set_visible(wh, show);
 365
 366         if (show) {
 367                 layout_pair(screen, y, screen->widgets.gateway_l, wf);
 368                 widget_move(wh, y, help_x);
 369                 y++;
 370         }
 371
 372         wh = widget_label_base(screen->widgets.dns_help_l);
 373         layout_pair(screen, y, screen->widgets.dns_l,
 374                         widget_textbox_base(screen->widgets.dns_f));
 375         widget_move(wh, y, help_x);
 376         y++;
 377
 378         /* we show the DNS/DHCP help if we're configuring DHCP */
 379         show = net_conf != NET_CONF_TYPE_STATIC;
 380         wl = widget_label_base(screen->widgets.dns_dhcp_help_l);
 381         widget_set_visible(wl, show);
 382         if (show) {
 383                 widget_move(wl, y, screen->field_x);
 384                 y += 1;
 385         }
 386
 387         y += 1;
 388
 389         widget_move(widget_button_base(screen->widgets.ok_b),
 390                         y, screen->field_x);
 391         widget_move(widget_button_base(screen->widgets.cancel_b),
 392                         y, screen->field_x + 10);
 393 }
 394
 395 static void config_screen_network_change(void *arg, int value)
 396 {
 397         struct config_screen *screen = arg;
 398         screen->net_conf_type = value;
 399         widgetset_unpost(screen->widgetset);
 400         config_screen_layout_widgets(screen, value);
 401         widgetset_post(screen->widgetset);
 402 }
 403
 404 static struct interface_config *first_active_interface(
 405                 const struct config *config)
 406 {
 407         unsigned int i;
 408
 409         for (i = 0; i < config->network.n_interfaces; i++) {
 410                 if (config->network.interfaces[i]->ignore)
 411                         continue;
 412                 return config->network.interfaces[i];
 413         }
 414         return NULL;
 415 }
 416
 417 static enum net_conf_type find_net_conf_type(const struct config *config)
 418 {
 419         struct interface_config *ifcfg;
 420
 421         ifcfg = first_active_interface(config);
 422
 423         if (!ifcfg)
 424                 return NET_CONF_TYPE_DHCP_ALL;
 425
 426         else if (ifcfg->method == CONFIG_METHOD_DHCP)
 427                 return NET_CONF_TYPE_DHCP_ONE;
 428
 429         else if (ifcfg->method == CONFIG_METHOD_STATIC)
 430                 return NET_CONF_TYPE_STATIC;
 431
 432         assert(0);
 433         return NET_CONF_TYPE_DHCP_ALL;
 434 }
 435
 436 static void config_screen_setup_empty(struct config_screen *screen)
 437 {
 438         widget_new_label(screen->widgetset, 2, screen->field_x,
 439                         "Waiting for configuration data...");
 440         screen->widgets.cancel_b = widget_new_button(screen->widgetset,
 441                         4, screen->field_x, 6, "Cancel", cancel_click, screen);
 442 }
 443
 444
 445 static void config_screen_setup_widgets(struct config_screen *screen,
 446                 const struct config *config,
 447                 const struct system_info *sysinfo)
 448 {
 449         struct nc_widgetset *set = screen->widgetset;
 450         struct interface_config *ifcfg;
 451         char *str, *ip, *mask, *gw;
 452         enum net_conf_type type;
 453         unsigned int i;
 454
 455         build_assert(sizeof(screen->widgets) / sizeof(struct widget *)
 456                         == N_FIELDS);
 457
 458         type = screen->net_conf_type;
 459         ifcfg = first_active_interface(config);
 460
 461         screen->widgets.autoboot_l = widget_new_label(set, 0, 0, "Autoboot:");
 462         screen->widgets.autoboot_f = widget_new_checkbox(set, 0, 0,
 463                                         config->autoboot_enabled);
 464
 465         str = talloc_asprintf(screen, "%d", config->autoboot_timeout_sec);
 466         screen->widgets.timeout_l = widget_new_label(set, 0, 0, "Timeout:");
 467         screen->widgets.timeout_f = widget_new_textbox(set, 0, 0, 5, str);
 468         screen->widgets.timeout_help_l = widget_new_label(set, 0, 0, "seconds");
 469
 470         widget_textbox_set_validator_integer(screen->widgets.timeout_f, 0, 999);
 471
 472         screen->widgets.network_l = widget_new_label(set, 0, 0, "Network");
 473         screen->widgets.network_f = widget_new_select(set, 0, 0, 50);
 474
 475         widget_select_add_option(screen->widgets.network_f,
 476                                         NET_CONF_TYPE_DHCP_ALL,
 477                                         "DHCP on all active interfaces",
 478                                         type == NET_CONF_TYPE_DHCP_ALL);
 479         widget_select_add_option(screen->widgets.network_f,
 480                                         NET_CONF_TYPE_DHCP_ONE,
 481                                         "DHCP on a specific interface",
 482                                         type == NET_CONF_TYPE_DHCP_ONE);
 483         widget_select_add_option(screen->widgets.network_f,
 484                                         NET_CONF_TYPE_STATIC,
 485                                         "Static IP configuration",
 486                                         type == NET_CONF_TYPE_STATIC);
 487
 488         widget_select_on_change(screen->widgets.network_f,
 489                         config_screen_network_change, screen);
 490
 491         screen->widgets.iface_l = widget_new_label(set, 0, 0, "Device:");
 492         screen->widgets.iface_f = widget_new_select(set, 0, 0, 50);
 493
 494         for (i = 0; i < sysinfo->n_interfaces; i++) {
 495                 struct interface_info *info = sysinfo->interfaces[i];
 496                 char str[50], mac[20];
 497                 bool is_default;
 498
 499                 is_default = ifcfg && !memcmp(ifcfg->hwaddr, info->hwaddr,
 500                                         sizeof(ifcfg->hwaddr));
 501
 502                 mac_str(info->hwaddr, info->hwaddr_size, mac, sizeof(mac));
 503                 snprintf(str, sizeof(str), "%s [%s, %s]", info->name, mac,
 504                                 info->link ? "link up" : "link down");
 505
 506                 widget_select_add_option(screen->widgets.iface_f,
 507                                                 i, str, is_default);
 508         }
 509
 510         gw = ip = mask = NULL;
 511         if (ifcfg && ifcfg->method == CONFIG_METHOD_STATIC) {
 512                 char *sep;
 513
 514                 str = talloc_strdup(screen, ifcfg->static_config.address);
 515                 sep = strchr(str, '/');
 516                 ip = str;
 517
 518                 if (sep) {
 519                         *sep = '\0';
 520                         mask = sep + 1;
 521                 }
 522                 gw = ifcfg->static_config.gateway;
 523         }
 524
 525         screen->widgets.ip_addr_l = widget_new_label(set, 0, 0, "IP/mask:");
 526         screen->widgets.ip_addr_f = widget_new_textbox(set, 0, 0, 16, ip);
 527         screen->widgets.ip_mask_l = widget_new_label(set, 0, 0, "/");
 528         screen->widgets.ip_mask_f = widget_new_textbox(set, 0, 0, 4, mask);
 529         screen->widgets.ip_addr_mask_help_l =
 530                 widget_new_label(set, 0, 0, "(eg. 192.168.0.10 / 24)");
 531
 532         widget_textbox_set_validator_ipv4(screen->widgets.ip_addr_f);
 533         widget_textbox_set_validator_integer(screen->widgets.ip_mask_f, 1, 31);
 534
 535         screen->widgets.gateway_l = widget_new_label(set, 0, 0, "Gateway:");
 536         screen->widgets.gateway_f = widget_new_textbox(set, 0, 0, 16, gw);
 537         screen->widgets.gateway_help_l =
 538                 widget_new_label(set, 0, 0, "(eg. 192.168.0.1)");
 539
 540         widget_textbox_set_validator_ipv4(screen->widgets.gateway_f);
 541
 542         str = talloc_strdup(screen, "");
 543         for (i = 0; i < config->network.n_dns_servers; i++) {
 544                 str = talloc_asprintf_append(str, "%s%s",
 545                                 (i == 0) ? "" : " ",
 546                                 config->network.dns_servers[i]);
 547         }
 548
 549         screen->widgets.dns_l = widget_new_label(set, 0, 0, "DNS Server(s):");
 550         screen->widgets.dns_f = widget_new_textbox(set, 0, 0, 32, str);
 551         screen->widgets.dns_help_l =
 552                 widget_new_label(set, 0, 0, "(eg. 192.168.0.2)");
 553
 554         widget_textbox_set_validator_ipv4_multi(screen->widgets.dns_f);
 555
 556         screen->widgets.dns_dhcp_help_l = widget_new_label(set, 0, 0,
 557                         "(if not provided by DHCP server)");
 558
 559         screen->widgets.ok_b = widget_new_button(set, 0, 0, 6, "OK",
 560                         ok_click, screen);
 561         screen->widgets.cancel_b = widget_new_button(set, 0, 0, 6, "Cancel",
 562                         cancel_click, screen);
 563 }
 564
 565 static void config_screen_widget_focus(struct nc_widget *widget, void *arg)
 566 {
 567         struct config_screen *screen = arg;
 568         int w_y, s_max;
 569
 570         w_y = widget_y(widget) + widget_focus_y(widget);
 571         s_max = getmaxy(screen->scr.sub_ncw) - 1;
 572
 573         if (w_y < screen->scroll_y)
 574                 screen->scroll_y = w_y;
 575
 576         else if (w_y + screen->scroll_y + 1 > s_max)
 577                 screen->scroll_y = 1 + w_y - s_max;
 578
 579         else
 580                 return;
 581
 582         pad_refresh(screen);
 583 }
 584
 585 static void config_screen_draw(struct config_screen *screen,
 586                 const struct config *config,
 587                 const struct system_info *sysinfo)
 588 {
 589         bool repost = false;
 590         int height;
 591
 592         /* The size of the pad we'll need depends on the number of interfaces.
 593          *
 594          * We use N_FIELDS (which is quite conservative, as some fields share
 595          * a line) as a base, then add 3 (as the network select field is
 596          * takes 3 lines), and n_interfaces (as the network interface field
 597          * has n_interfaces lines).
 598          */
 599         height = N_FIELDS + 3;
 600         if (sysinfo)
 601                 height += sysinfo->n_interfaces;
 602         if (!screen->pad || getmaxy(screen->pad) < height) {
 603                 if (screen->pad)
 604                         delwin(screen->pad);
 605                 screen->pad = newpad(height, COLS);
 606         }
 607
 608         if (screen->widgetset) {
 609                 widgetset_unpost(screen->widgetset);
 610                 talloc_free(screen->widgetset);
 611                 repost = true;
 612         }
 613
 614         screen->widgetset = widgetset_create(screen, screen->scr.main_ncw,
 615                         screen->pad);
 616         widgetset_set_widget_focus(screen->widgetset,
 617                         config_screen_widget_focus, screen);
 618
 619         if (!config || !sysinfo) {
 620                 config_screen_setup_empty(screen);
 621         } else {
 622                 screen->net_conf_type = find_net_conf_type(config);
 623
 624                 config_screen_setup_widgets(screen, config, sysinfo);
 625                 config_screen_layout_widgets(screen, screen->net_conf_type);
 626         }
 627
 628         if (repost)
 629                 widgetset_post(screen->widgetset);
 630 }
 631
 632 void config_screen_update(struct config_screen *screen,
 633                 const struct config *config,
 634                 const struct system_info *sysinfo)
 635 {
 636         config_screen_draw(screen, config, sysinfo);
 637         pad_refresh(screen);
 638 }
 639
 640 static int config_screen_destroy(void *arg)
 641 {
 642         struct config_screen *screen = arg;
 643         if (screen->pad)
 644                 delwin(screen->pad);
 645         return 0;
 646 }
 647
 648 struct config_screen *config_screen_init(struct cui *cui,
 649                 const struct config *config,
 650                 const struct system_info *sysinfo,
 651                 void (*on_exit)(struct cui *))
 652 {
 653         struct config_screen *screen;
 654
 655         screen = talloc_zero(cui, struct config_screen);
 656         talloc_set_destructor(screen, config_screen_destroy);
 657         nc_scr_init(&screen->scr, pb_config_screen_sig, 0,
 658                         cui, config_screen_process_key,
 659                         config_screen_post, config_screen_unpost,
 660                         config_screen_resize);
 661
 662         screen->cui = cui;
 663         screen->on_exit = on_exit;
 664         screen->label_x = 2;
 665         screen->field_x = 17;
 666
 667         screen->scr.frame.ltitle = talloc_strdup(screen,
 668                         "Petitboot System Configuration");
 669         screen->scr.frame.rtitle = NULL;
 670         screen->scr.frame.help = talloc_strdup(screen,
 671                         "tab=next, shift+tab=previous");
 672         nc_scr_frame_draw(&screen->scr);
 673
 674         scrollok(screen->scr.sub_ncw, true);
 675
 676         config_screen_draw(screen, config, sysinfo);
 677
 678         return screen;
 679 }