util/kconfig/conf.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
   4  */
   5
   6 #include <ctype.h>
   7 #include <limits.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <time.h>
  12 #include <unistd.h>
  13 #include <getopt.h>
  14 #include <sys/time.h>
  15 #include <errno.h>
  16
  17 #include "lkc.h"
  18
  19 static void conf(struct menu *menu);
  20 static void check_conf(struct menu *menu);
  21
  22 enum input_mode {
  23         oldaskconfig,
  24         syncconfig,
  25         oldconfig,
  26         allnoconfig,
  27         allyesconfig,
  28         allmodconfig,
  29         alldefconfig,
  30         randconfig,
  31         defconfig,
  32         savedefconfig,
  33         listnewconfig,
  34         helpnewconfig,
  35         olddefconfig,
  36         yes2modconfig,
  37         mod2yesconfig,
  38         mod2noconfig,
  39 };
  40 static enum input_mode input_mode = oldaskconfig;
  41 static int input_mode_opt;
  42 static int indent = 1;
  43 static int tty_stdio;
  44 static int sync_kconfig;
  45 static int conf_cnt;
  46 static char line[PATH_MAX];
  47 static struct menu *rootEntry;
  48
  49 static void print_help(struct menu *menu)
  50 {
  51         struct gstr help = str_new();
  52
  53         menu_get_ext_help(menu, &help);
  54
  55         printf("\n%s\n", str_get(&help));
  56         str_free(&help);
  57 }
  58
  59 static void strip(char *str)
  60 {
  61         char *p = str;
  62         int l;
  63
  64         while ((isspace(*p)))
  65                 p++;
  66         l = strlen(p);
  67         if (p != str)
  68                 memmove(str, p, l + 1);
  69         if (!l)
  70                 return;
  71         p = str + l - 1;
  72         while ((isspace(*p)))
  73                 *p-- = 0;
  74 }
  75
  76 /* Helper function to facilitate fgets() by Jean Sacren. */
  77 static void xfgets(char *str, int size, FILE *in)
  78 {
  79         if (!fgets(str, size, in))
  80                 fprintf(stderr, "\nError in reading or end of file.\n");
  81
  82         if (!tty_stdio)
  83                 printf("%s", str);
  84 }
  85
  86 static void set_randconfig_seed(void)
  87 {
  88         unsigned int seed;
  89         char *env;
  90         bool seed_set = false;
  91
  92         env = getenv("KCONFIG_SEED");
  93         if (env && *env) {
  94                 char *endp;
  95
  96                 seed = strtol(env, &endp, 0);
  97                 if (*endp == '\0')
  98                         seed_set = true;
  99         }
 100
 101         if (!seed_set) {
 102                 struct timeval now;
 103
 104                 /*
 105                  * Use microseconds derived seed, compensate for systems where it may
 106                  * be zero.
 107                  */
 108                 gettimeofday(&now, NULL);
 109                 seed = (now.tv_sec + 1) * (now.tv_usec + 1);
 110         }
 111
 112         printf("KCONFIG_SEED=0x%X\n", seed);
 113         srand(seed);
 114 }
 115
 116 static bool randomize_choice_values(struct symbol *csym)
 117 {
 118         struct property *prop;
 119         struct symbol *sym;
 120         struct expr *e;
 121         int cnt, def;
 122
 123         /*
 124          * If choice is mod then we may have more items selected
 125          * and if no then no-one.
 126          * In both cases stop.
 127          */
 128         if (csym->curr.tri != yes)
 129                 return false;
 130
 131         prop = sym_get_choice_prop(csym);
 132
 133         /* count entries in choice block */
 134         cnt = 0;
 135         expr_list_for_each_sym(prop->expr, e, sym)
 136                 cnt++;
 137
 138         /*
 139          * find a random value and set it to yes,
 140          * set the rest to no so we have only one set
 141          */
 142         def = rand() % cnt;
 143
 144         cnt = 0;
 145         expr_list_for_each_sym(prop->expr, e, sym) {
 146                 if (def == cnt++) {
 147                         sym->def[S_DEF_USER].tri = yes;
 148                         csym->def[S_DEF_USER].val = sym;
 149                 } else {
 150                         sym->def[S_DEF_USER].tri = no;
 151                 }
 152                 sym->flags |= SYMBOL_DEF_USER;
 153                 /* clear VALID to get value calculated */
 154                 sym->flags &= ~SYMBOL_VALID;
 155         }
 156         csym->flags |= SYMBOL_DEF_USER;
 157         /* clear VALID to get value calculated */
 158         csym->flags &= ~SYMBOL_VALID;
 159
 160         return true;
 161 }
 162
 163 enum conf_def_mode {
 164         def_default,
 165         def_yes,
 166         def_mod,
 167         def_no,
 168         def_random
 169 };
 170
 171 static bool conf_set_all_new_symbols(enum conf_def_mode mode)
 172 {
 173         struct symbol *sym, *csym;
 174         int i, cnt;
 175         /*
 176          * can't go as the default in switch-case below, otherwise gcc whines
 177          * about -Wmaybe-uninitialized
 178          */
 179         int pby = 50; /* probability of bool     = y */
 180         int pty = 33; /* probability of tristate = y */
 181         int ptm = 33; /* probability of tristate = m */
 182         bool has_changed = false;
 183
 184         if (mode == def_random) {
 185                 int n, p[3];
 186                 char *env = getenv("KCONFIG_PROBABILITY");
 187
 188                 n = 0;
 189                 while (env && *env) {
 190                         char *endp;
 191                         int tmp = strtol(env, &endp, 10);
 192
 193                         if (tmp >= 0 && tmp <= 100) {
 194                                 p[n++] = tmp;
 195                         } else {
 196                                 errno = ERANGE;
 197                                 perror("KCONFIG_PROBABILITY");
 198                                 exit(1);
 199                         }
 200                         env = (*endp == ':') ? endp + 1 : endp;
 201                         if (n >= 3)
 202                                 break;
 203                 }
 204                 switch (n) {
 205                 case 1:
 206                         pby = p[0];
 207                         ptm = pby / 2;
 208                         pty = pby - ptm;
 209                         break;
 210                 case 2:
 211                         pty = p[0];
 212                         ptm = p[1];
 213                         pby = pty + ptm;
 214                         break;
 215                 case 3:
 216                         pby = p[0];
 217                         pty = p[1];
 218                         ptm = p[2];
 219                         break;
 220                 }
 221
 222                 if (pty + ptm > 100) {
 223                         errno = ERANGE;
 224                         perror("KCONFIG_PROBABILITY");
 225                         exit(1);
 226                 }
 227         }
 228
 229         for_all_symbols(i, sym) {
 230                 if (sym_has_value(sym) || sym->flags & SYMBOL_VALID)
 231                         continue;
 232                 switch (sym_get_type(sym)) {
 233                 case S_BOOLEAN:
 234                 case S_TRISTATE:
 235                         has_changed = true;
 236                         switch (mode) {
 237                         case def_yes:
 238                                 sym->def[S_DEF_USER].tri = yes;
 239                                 break;
 240                         case def_mod:
 241                                 sym->def[S_DEF_USER].tri = mod;
 242                                 break;
 243                         case def_no:
 244                                 sym->def[S_DEF_USER].tri = no;
 245                                 break;
 246                         case def_random:
 247                                 sym->def[S_DEF_USER].tri = no;
 248                                 cnt = rand() % 100;
 249                                 if (sym->type == S_TRISTATE) {
 250                                         if (cnt < pty)
 251                                                 sym->def[S_DEF_USER].tri = yes;
 252                                         else if (cnt < pty + ptm)
 253                                                 sym->def[S_DEF_USER].tri = mod;
 254                                 } else if (cnt < pby)
 255                                         sym->def[S_DEF_USER].tri = yes;
 256                                 break;
 257                         default:
 258                                 continue;
 259                         }
 260                         if (!(sym_is_choice(sym) && mode == def_random))
 261                                 sym->flags |= SYMBOL_DEF_USER;
 262                         break;
 263                 default:
 264                         break;
 265                 }
 266
 267         }
 268
 269         sym_clear_all_valid();
 270
 271         /*
 272          * We have different type of choice blocks.
 273          * If curr.tri equals to mod then we can select several
 274          * choice symbols in one block.
 275          * In this case we do nothing.
 276          * If curr.tri equals yes then only one symbol can be
 277          * selected in a choice block and we set it to yes,
 278          * and the rest to no.
 279          */
 280         if (mode != def_random) {
 281                 for_all_symbols(i, csym) {
 282                         if ((sym_is_choice(csym) && !sym_has_value(csym)) ||
 283                             sym_is_choice_value(csym))
 284                                 csym->flags |= SYMBOL_NEED_SET_CHOICE_VALUES;
 285                 }
 286         }
 287
 288         for_all_symbols(i, csym) {
 289                 if (sym_has_value(csym) || !sym_is_choice(csym))
 290                         continue;
 291
 292                 sym_calc_value(csym);
 293                 if (mode == def_random)
 294                         has_changed |= randomize_choice_values(csym);
 295                 else {
 296                         set_all_choice_values(csym);
 297                         has_changed = true;
 298                 }
 299         }
 300
 301         return has_changed;
 302 }
 303
 304 static void conf_rewrite_tristates(tristate old_val, tristate new_val)
 305 {
 306         struct symbol *sym;
 307         int i;
 308
 309         for_all_symbols(i, sym) {
 310                 if (sym_get_type(sym) == S_TRISTATE &&
 311                     sym->def[S_DEF_USER].tri == old_val)
 312                         sym->def[S_DEF_USER].tri = new_val;
 313         }
 314         sym_clear_all_valid();
 315 }
 316
 317 static int conf_askvalue(struct symbol *sym, const char *def)
 318 {
 319         if (!sym_has_value(sym))
 320                 printf("(NEW) ");
 321
 322         line[0] = '\n';
 323         line[1] = 0;
 324
 325         if (!sym_is_changeable(sym)) {
 326                 printf("%s\n", def);
 327                 line[0] = '\n';
 328                 line[1] = 0;
 329                 return 0;
 330         }
 331
 332         switch (input_mode) {
 333         case oldconfig:
 334         case syncconfig:
 335                 if (sym_has_value(sym)) {
 336                         printf("%s\n", def);
 337                         return 0;
 338                 }
 339                 /* fall through */
 340         default:
 341                 fflush(stdout);
 342                 xfgets(line, sizeof(line), stdin);
 343                 break;
 344         }
 345
 346         return 1;
 347 }
 348
 349 static int conf_string(struct menu *menu)
 350 {
 351         struct symbol *sym = menu->sym;
 352         const char *def;
 353
 354         while (1) {
 355                 printf("%*s%s ", indent - 1, "", menu->prompt->text);
 356                 printf("(%s) ", sym->name);
 357                 def = sym_get_string_value(sym);
 358                 if (def)
 359                         printf("[%s] ", def);
 360                 if (!conf_askvalue(sym, def))
 361                         return 0;
 362                 switch (line[0]) {
 363                 case '\n':
 364                         break;
 365                 case '?':
 366                         /* print help */
 367                         if (line[1] == '\n') {
 368                                 print_help(menu);
 369                                 def = NULL;
 370                                 break;
 371                         }
 372                         /* fall through */
 373                 default:
 374                         line[strlen(line)-1] = 0;
 375                         def = line;
 376                 }
 377                 if (def && sym_set_string_value(sym, def))
 378                         return 0;
 379         }
 380 }
 381
 382 static int conf_sym(struct menu *menu)
 383 {
 384         struct symbol *sym = menu->sym;
 385         tristate oldval, newval;
 386
 387         while (1) {
 388                 printf("%*s%s ", indent - 1, "", menu->prompt->text);
 389                 if (sym->name)
 390                         printf("(%s) ", sym->name);
 391                 putchar('[');
 392                 oldval = sym_get_tristate_value(sym);
 393                 switch (oldval) {
 394                 case no:
 395                         putchar('N');
 396                         break;
 397                 case mod:
 398                         putchar('M');
 399                         break;
 400                 case yes:
 401                         putchar('Y');
 402                         break;
 403                 }
 404                 if (oldval != no && sym_tristate_within_range(sym, no))
 405                         printf("/n");
 406                 if (oldval != mod && sym_tristate_within_range(sym, mod))
 407                         printf("/m");
 408                 if (oldval != yes && sym_tristate_within_range(sym, yes))
 409                         printf("/y");
 410                 printf("/?] ");
 411                 if (!conf_askvalue(sym, sym_get_string_value(sym)))
 412                         return 0;
 413                 strip(line);
 414
 415                 switch (line[0]) {
 416                 case 'n':
 417                 case 'N':
 418                         newval = no;
 419                         if (!line[1] || !strcmp(&line[1], "o"))
 420                                 break;
 421                         continue;
 422                 case 'm':
 423                 case 'M':
 424                         newval = mod;
 425                         if (!line[1])
 426                                 break;
 427                         continue;
 428                 case 'y':
 429                 case 'Y':
 430                         newval = yes;
 431                         if (!line[1] || !strcmp(&line[1], "es"))
 432                                 break;
 433                         continue;
 434                 case 0:
 435                         newval = oldval;
 436                         break;
 437                 case '?':
 438                         goto help;
 439                 default:
 440                         continue;
 441                 }
 442                 if (sym_set_tristate_value(sym, newval))
 443                         return 0;
 444 help:
 445                 print_help(menu);
 446         }
 447 }
 448
 449 static int conf_choice(struct menu *menu)
 450 {
 451         struct symbol *sym, *def_sym;
 452         struct menu *child;
 453         bool is_new;
 454
 455         sym = menu->sym;
 456         is_new = !sym_has_value(sym);
 457         if (sym_is_changeable(sym)) {
 458                 conf_sym(menu);
 459                 sym_calc_value(sym);
 460                 switch (sym_get_tristate_value(sym)) {
 461                 case no:
 462                         return 1;
 463                 case mod:
 464                         return 0;
 465                 case yes:
 466                         break;
 467                 }
 468         } else {
 469                 switch (sym_get_tristate_value(sym)) {
 470                 case no:
 471                         return 1;
 472                 case mod:
 473                         printf("%*s%s\n", indent - 1, "", menu_get_prompt(menu));
 474                         return 0;
 475                 case yes:
 476                         break;
 477                 }
 478         }
 479
 480         while (1) {
 481                 int cnt, def;
 482
 483                 printf("%*s%s\n", indent - 1, "", menu_get_prompt(menu));
 484                 def_sym = sym_get_choice_value(sym);
 485                 cnt = def = 0;
 486                 line[0] = 0;
 487                 for (child = menu->list; child; child = child->next) {
 488                         if (!menu_is_visible(child))
 489                                 continue;
 490                         if (!child->sym) {
 491                                 printf("%*c %s\n", indent, '*', menu_get_prompt(child));
 492                                 continue;
 493                         }
 494                         cnt++;
 495                         if (child->sym == def_sym) {
 496                                 def = cnt;
 497                                 printf("%*c", indent, '>');
 498                         } else
 499                                 printf("%*c", indent, ' ');
 500                         printf(" %d. %s", cnt, menu_get_prompt(child));
 501                         if (child->sym->name)
 502                                 printf(" (%s)", child->sym->name);
 503                         if (!sym_has_value(child->sym))
 504                                 printf(" (NEW)");
 505                         printf("\n");
 506                 }
 507                 printf("%*schoice", indent - 1, "");
 508                 if (cnt == 1) {
 509                         printf("[1]: 1\n");
 510                         goto conf_childs;
 511                 }
 512                 printf("[1-%d?]: ", cnt);
 513                 switch (input_mode) {
 514                 case oldconfig:
 515                 case syncconfig:
 516                         if (!is_new) {
 517                                 cnt = def;
 518                                 printf("%d\n", cnt);
 519                                 break;
 520                         }
 521                         /* fall through */
 522                 case oldaskconfig:
 523                         fflush(stdout);
 524                         xfgets(line, sizeof(line), stdin);
 525                         strip(line);
 526                         if (line[0] == '?') {
 527                                 print_help(menu);
 528                                 continue;
 529                         }
 530                         if (!line[0])
 531                                 cnt = def;
 532                         else if (isdigit(line[0]))
 533                                 cnt = atoi(line);
 534                         else
 535                                 continue;
 536                         break;
 537                 default:
 538                         break;
 539                 }
 540
 541         conf_childs:
 542                 for (child = menu->list; child; child = child->next) {
 543                         if (!child->sym || !menu_is_visible(child))
 544                                 continue;
 545                         if (!--cnt)
 546                                 break;
 547                 }
 548                 if (!child)
 549                         continue;
 550                 if (line[0] && line[strlen(line) - 1] == '?') {
 551                         print_help(child);
 552                         continue;
 553                 }
 554                 sym_set_tristate_value(child->sym, yes);
 555                 for (child = child->list; child; child = child->next) {
 556                         indent += 2;
 557                         conf(child);
 558                         indent -= 2;
 559                 }
 560                 return 1;
 561         }
 562 }
 563
 564 static void conf(struct menu *menu)
 565 {
 566         struct symbol *sym;
 567         struct property *prop;
 568         struct menu *child;
 569
 570         if (!menu_is_visible(menu))
 571                 return;
 572
 573         sym = menu->sym;
 574         prop = menu->prompt;
 575         if (prop) {
 576                 const char *prompt;
 577
 578                 switch (prop->type) {
 579                 case P_MENU:
 580                         /*
 581                          * Except in oldaskconfig mode, we show only menus that
 582                          * contain new symbols.
 583                          */
 584                         if (input_mode != oldaskconfig && rootEntry != menu) {
 585                                 check_conf(menu);
 586                                 return;
 587                         }
 588                         /* fall through */
 589                 case P_COMMENT:
 590                         prompt = menu_get_prompt(menu);
 591                         if (prompt)
 592                                 printf("%*c\n%*c %s\n%*c\n",
 593                                         indent, '*',
 594                                         indent, '*', prompt,
 595                                         indent, '*');
 596                 default:
 597                         ;
 598                 }
 599         }
 600
 601         if (!sym)
 602                 goto conf_childs;
 603
 604         if (sym_is_choice(sym)) {
 605                 conf_choice(menu);
 606                 if (sym->curr.tri != mod)
 607                         return;
 608                 goto conf_childs;
 609         }
 610
 611         switch (sym->type) {
 612         case S_INT:
 613         case S_HEX:
 614         case S_STRING:
 615                 conf_string(menu);
 616                 break;
 617         default:
 618                 conf_sym(menu);
 619                 break;
 620         }
 621
 622 conf_childs:
 623         if (sym)
 624                 indent += 2;
 625         for (child = menu->list; child; child = child->next)
 626                 conf(child);
 627         if (sym)
 628                 indent -= 2;
 629 }
 630
 631 static void check_conf(struct menu *menu)
 632 {
 633         struct symbol *sym;
 634         struct menu *child;
 635
 636         if (!menu_is_visible(menu))
 637                 return;
 638
 639         sym = menu->sym;
 640         if (sym && !sym_has_value(sym) &&
 641             (sym_is_changeable(sym) ||
 642              (sym_is_choice(sym) && sym_get_tristate_value(sym) == yes))) {
 643
 644                 switch (input_mode) {
 645                 case listnewconfig:
 646                         if (sym->name)
 647                                 print_symbol_for_listconfig(sym);
 648                         break;
 649                 case helpnewconfig:
 650                         printf("-----\n");
 651                         print_help(menu);
 652                         printf("-----\n");
 653                         break;
 654                 default:
 655                         if (!conf_cnt++)
 656                                 printf("*\n* Restart config...\n*\n");
 657                         rootEntry = menu_get_parent_menu(menu);
 658                         conf(rootEntry);
 659                         break;
 660                 }
 661         }
 662
 663         for (child = menu->list; child; child = child->next)
 664                 check_conf(child);
 665 }
 666
 667 static const struct option long_opts[] = {
 668         {"help",          no_argument,       NULL,            'h'},
 669         {"silent",        no_argument,       NULL,            's'},
 670         {"oldaskconfig",  no_argument,       &input_mode_opt, oldaskconfig},
 671         {"oldconfig",     no_argument,       &input_mode_opt, oldconfig},
 672         {"syncconfig",    no_argument,       &input_mode_opt, syncconfig},
 673         {"defconfig",     required_argument, &input_mode_opt, defconfig},
 674         {"savedefconfig", required_argument, &input_mode_opt, savedefconfig},
 675         {"allnoconfig",   no_argument,       &input_mode_opt, allnoconfig},
 676         {"allyesconfig",  no_argument,       &input_mode_opt, allyesconfig},
 677         {"allmodconfig",  no_argument,       &input_mode_opt, allmodconfig},
 678         {"alldefconfig",  no_argument,       &input_mode_opt, alldefconfig},
 679         {"randconfig",    no_argument,       &input_mode_opt, randconfig},
 680         {"listnewconfig", no_argument,       &input_mode_opt, listnewconfig},
 681         {"helpnewconfig", no_argument,       &input_mode_opt, helpnewconfig},
 682         {"olddefconfig",  no_argument,       &input_mode_opt, olddefconfig},
 683         {"yes2modconfig", no_argument,       &input_mode_opt, yes2modconfig},
 684         {"mod2yesconfig", no_argument,       &input_mode_opt, mod2yesconfig},
 685         {"mod2noconfig",  no_argument,       &input_mode_opt, mod2noconfig},
 686         {NULL, 0, NULL, 0}
 687 };
 688
 689 static void conf_usage(const char *progname)
 690 {
 691         printf("Usage: %s [options] <kconfig-file>\n", progname);
 692         printf("\n");
 693         printf("Generic options:\n");
 694         printf("  -h, --help              Print this message and exit.\n");
 695         printf("  -s, --silent            Do not print log.\n");
 696         printf("\n");
 697         printf("Mode options:\n");
 698         printf("  --listnewconfig         List new options\n");
 699         printf("  --helpnewconfig         List new options and help text\n");
 700         printf("  --oldaskconfig          Start a new configuration using a line-oriented program\n");
 701         printf("  --oldconfig             Update a configuration using a provided .config as base\n");
 702         printf("  --syncconfig            Similar to oldconfig but generates configuration in\n"
 703                "                          include/{generated/,config/}\n");
 704         printf("  --olddefconfig          Same as oldconfig but sets new symbols to their default value\n");
 705         printf("  --defconfig <file>      New config with default defined in <file>\n");
 706         printf("  --savedefconfig <file>  Save the minimal current configuration to <file>\n");
 707         printf("  --allnoconfig           New config where all options are answered with no\n");
 708         printf("  --allyesconfig          New config where all options are answered with yes\n");
 709         printf("  --allmodconfig          New config where all options are answered with mod\n");
 710         printf("  --alldefconfig          New config with all symbols set to default\n");
 711         printf("  --randconfig            New config with random answer to all options\n");
 712         printf("  --yes2modconfig         Change answers from yes to mod if possible\n");
 713         printf("  --mod2yesconfig         Change answers from mod to yes if possible\n");
 714         printf("  --mod2noconfig          Change answers from mod to no if possible\n");
 715         printf("  (If none of the above is given, --oldaskconfig is the default)\n");
 716 }
 717
 718 int main(int ac, char **av)
 719 {
 720         const char *progname = av[0];
 721         int opt;
 722         const char *name, *defconfig_file = NULL /* gcc uninit */;
 723         int no_conf_write = 0;
 724
 725         tty_stdio = isatty(0) && isatty(1);
 726
 727         while ((opt = getopt_long(ac, av, "hs", long_opts, NULL)) != -1) {
 728                 switch (opt) {
 729                 case 'h':
 730                         conf_usage(progname);
 731                         exit(1);
 732                         break;
 733                 case 's':
 734                         conf_set_message_callback(NULL);
 735                         break;
 736                 case 0:
 737                         input_mode = input_mode_opt;
 738                         switch (input_mode) {
 739                         case syncconfig:
 740                                 /*
 741                                  * syncconfig is invoked during the build stage.
 742                                  * Suppress distracting
 743                                  *   "configuration written to ..."
 744                                  */
 745                                 conf_set_message_callback(NULL);
 746                                 sync_kconfig = 1;
 747                                 break;
 748                         case defconfig:
 749                         case savedefconfig:
 750                                 defconfig_file = optarg;
 751                                 break;
 752                         case randconfig:
 753                                 set_randconfig_seed();
 754                                 break;
 755                         default:
 756                                 break;
 757                         }
 758                 default:
 759                         break;
 760                 }
 761         }
 762         if (ac == optind) {
 763                 fprintf(stderr, "%s: Kconfig file missing\n", av[0]);
 764                 conf_usage(progname);
 765                 exit(1);
 766         }
 767         conf_parse(av[optind]);
 768         //zconfdump(stdout);
 769
 770         switch (input_mode) {
 771         case defconfig:
 772                 if (conf_read(defconfig_file)) {
 773                         fprintf(stderr,
 774                                 "***\n"
 775                                   "*** Can't find default configuration \"%s\"!\n"
 776                                   "***\n",
 777                                 defconfig_file);
 778                         exit(1);
 779                 }
 780                 break;
 781         case savedefconfig:
 782         case syncconfig:
 783         case oldaskconfig:
 784         case oldconfig:
 785         case listnewconfig:
 786         case helpnewconfig:
 787         case olddefconfig:
 788         case yes2modconfig:
 789         case mod2yesconfig:
 790         case mod2noconfig:
 791                 conf_read(NULL);
 792                 break;
 793         case allnoconfig:
 794         case allyesconfig:
 795         case allmodconfig:
 796         case alldefconfig:
 797         case randconfig:
 798                 name = getenv("KCONFIG_ALLCONFIG");
 799                 if (!name)
 800                         break;
 801                 if ((strcmp(name, "") != 0) && (strcmp(name, "1") != 0)) {
 802                         if (conf_read_simple(name, S_DEF_USER)) {
 803                                 fprintf(stderr,
 804                                         "*** Can't read seed configuration \"%s\"!\n",
 805                                         name);
 806                                 exit(1);
 807                         }
 808                         break;
 809                 }
 810                 switch (input_mode) {
 811                 case allnoconfig:       name = "allno.config"; break;
 812                 case allyesconfig:      name = "allyes.config"; break;
 813                 case allmodconfig:      name = "allmod.config"; break;
 814                 case alldefconfig:      name = "alldef.config"; break;
 815                 case randconfig:        name = "allrandom.config"; break;
 816                 default: break;
 817                 }
 818                 if (conf_read_simple(name, S_DEF_USER) &&
 819                     conf_read_simple("all.config", S_DEF_USER)) {
 820                         fprintf(stderr,
 821                                 "*** KCONFIG_ALLCONFIG set, but no \"%s\" or \"all.config\" file found\n",
 822                                 name);
 823                         exit(1);
 824                 }
 825                 break;
 826         default:
 827                 break;
 828         }
 829
 830         if (sync_kconfig) {
 831                 name = getenv("KCONFIG_NOSILENTUPDATE");
 832                 if (name && *name) {
 833                         if (conf_get_changed()) {
 834                                 fprintf(stderr,
 835                                         "\n*** The configuration requires explicit update.\n\n");
 836                                 return 1;
 837                         }
 838                         no_conf_write = 1;
 839                 }
 840         }
 841
 842         switch (input_mode) {
 843         case allnoconfig:
 844                 conf_set_all_new_symbols(def_no);
 845                 break;
 846         case allyesconfig:
 847                 conf_set_all_new_symbols(def_yes);
 848                 break;
 849         case allmodconfig:
 850                 conf_set_all_new_symbols(def_mod);
 851                 break;
 852         case alldefconfig:
 853                 conf_set_all_new_symbols(def_default);
 854                 break;
 855         case randconfig:
 856                 /* Really nothing to do in this loop */
 857                 while (conf_set_all_new_symbols(def_random)) ;
 858                 break;
 859         case defconfig:
 860                 conf_set_all_new_symbols(def_default);
 861                 break;
 862         case savedefconfig:
 863                 break;
 864         case yes2modconfig:
 865                 conf_rewrite_tristates(yes, mod);
 866                 break;
 867         case mod2yesconfig:
 868                 conf_rewrite_tristates(mod, yes);
 869                 break;
 870         case mod2noconfig:
 871                 conf_rewrite_tristates(mod, no);
 872                 break;
 873         case oldaskconfig:
 874                 rootEntry = &rootmenu;
 875                 conf(&rootmenu);
 876                 input_mode = oldconfig;
 877                 /* fall through */
 878         case oldconfig:
 879         case listnewconfig:
 880         case helpnewconfig:
 881         case syncconfig:
 882                 /* Update until a loop caused no more changes */
 883                 do {
 884                         conf_cnt = 0;
 885                         check_conf(&rootmenu);
 886                 } while (conf_cnt);
 887                 break;
 888         case olddefconfig:
 889         default:
 890                 break;
 891         }
 892
 893         if (input_mode == savedefconfig) {
 894                 if (conf_write_defconfig(defconfig_file)) {
 895                         fprintf(stderr, "\n*** Error while saving defconfig to: %s\n\n",
 896                                 defconfig_file);
 897                         return 1;
 898                 }
 899         } else if (input_mode != listnewconfig && input_mode != helpnewconfig) {
 900                 if (!no_conf_write && conf_write(NULL)) {
 901                         fprintf(stderr, "\n*** Error during writing of the configuration.\n\n");
 902                         exit(1);
 903                 }
 904
 905                 /*
 906                  * Create auto.conf if it does not exist.
 907                  * This prevents GNU Make 4.1 or older from emitting
 908                  * "include/config/auto.conf: No such file or directory"
 909                  * in the top-level Makefile
 910                  *
 911                  * syncconfig always creates or updates auto.conf because it is
 912                  * used during the build.
 913                  */
 914                 if (conf_write_autoconf(sync_kconfig) && sync_kconfig) {
 915                         fprintf(stderr,
 916                                 "\n*** Error during sync of the configuration.\n\n");
 917                         return 1;
 918                 }
 919         }
 920         return 0;
 921 }