1// SPDX-License-Identifier: GPL-2.0
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 "internal.h"
18#include "lkc.h"
19
20static void conf(struct menu *menu);
21static void check_conf(struct menu *menu);
22
23enum input_mode {
24 oldaskconfig,
25 syncconfig,
26 oldconfig,
27 allnoconfig,
28 allyesconfig,
29 allmodconfig,
30 alldefconfig,
31 randconfig,
32 defconfig,
33 savedefconfig,
34 listnewconfig,
35 helpnewconfig,
36 olddefconfig,
37 yes2modconfig,
38 mod2yesconfig,
39 mod2noconfig,
40};
41static enum input_mode input_mode = oldaskconfig;
42static int input_mode_opt;
43static int indent = 1;
44static int tty_stdio;
45static int sync_kconfig;
46static int conf_cnt;
47static char line[PATH_MAX];
48static struct menu *rootEntry;
49
50static void print_help(struct menu *menu)
51{
52 struct gstr help = str_new();
53
54 menu_get_ext_help(menu, help: &help);
55
56 printf(format: "\n%s\n", str_get(gs: &help));
57 str_free(gs: &help);
58}
59
60static void strip(char *str)
61{
62 char *p = str;
63 int l;
64
65 while ((isspace(*p)))
66 p++;
67 l = strlen(s: p);
68 if (p != str)
69 memmove(dest: str, src: p, n: l + 1);
70 if (!l)
71 return;
72 p = str + l - 1;
73 while ((isspace(*p)))
74 *p-- = 0;
75}
76
77/* Helper function to facilitate fgets() by Jean Sacren. */
78static void xfgets(char *str, int size, FILE *in)
79{
80 if (!fgets(s: str, n: size, stream: in))
81 fprintf(stderr, format: "\nError in reading or end of file.\n");
82
83 if (!tty_stdio)
84 printf(format: "%s", str);
85}
86
87static void set_randconfig_seed(void)
88{
89 unsigned int seed;
90 char *env;
91 bool seed_set = false;
92
93 env = getenv(name: "KCONFIG_SEED");
94 if (env && *env) {
95 char *endp;
96
97 seed = strtol(nptr: env, endptr: &endp, base: 0);
98 if (*endp == '\0')
99 seed_set = true;
100 }
101
102 if (!seed_set) {
103 struct timeval now;
104
105 /*
106 * Use microseconds derived seed, compensate for systems where it may
107 * be zero.
108 */
109 gettimeofday(tv: &now, NULL);
110 seed = (now.tv_sec + 1) * (now.tv_usec + 1);
111 }
112
113 printf(format: "KCONFIG_SEED=0x%X\n", seed);
114 srand(seed: seed);
115}
116
117static bool randomize_choice_values(struct symbol *csym)
118{
119 struct property *prop;
120 struct symbol *sym;
121 struct expr *e;
122 int cnt, def;
123
124 /*
125 * If choice is mod then we may have more items selected
126 * and if no then no-one.
127 * In both cases stop.
128 */
129 if (csym->curr.tri != yes)
130 return false;
131
132 prop = sym_get_choice_prop(sym: csym);
133
134 /* count entries in choice block */
135 cnt = 0;
136 expr_list_for_each_sym(prop->expr, e, sym)
137 cnt++;
138
139 /*
140 * find a random value and set it to yes,
141 * set the rest to no so we have only one set
142 */
143 def = rand() % cnt;
144
145 cnt = 0;
146 expr_list_for_each_sym(prop->expr, e, sym) {
147 if (def == cnt++) {
148 sym->def[S_DEF_USER].tri = yes;
149 csym->def[S_DEF_USER].val = sym;
150 } else {
151 sym->def[S_DEF_USER].tri = no;
152 }
153 sym->flags |= SYMBOL_DEF_USER;
154 /* clear VALID to get value calculated */
155 sym->flags &= ~SYMBOL_VALID;
156 }
157 csym->flags |= SYMBOL_DEF_USER;
158 /* clear VALID to get value calculated */
159 csym->flags &= ~SYMBOL_VALID;
160
161 return true;
162}
163
164enum conf_def_mode {
165 def_default,
166 def_yes,
167 def_mod,
168 def_no,
169 def_random
170};
171
172static bool conf_set_all_new_symbols(enum conf_def_mode mode)
173{
174 struct symbol *sym, *csym;
175 int cnt;
176 /*
177 * can't go as the default in switch-case below, otherwise gcc whines
178 * about -Wmaybe-uninitialized
179 */
180 int pby = 50; /* probability of bool = y */
181 int pty = 33; /* probability of tristate = y */
182 int ptm = 33; /* probability of tristate = m */
183 bool has_changed = false;
184
185 if (mode == def_random) {
186 int n, p[3];
187 char *env = getenv(name: "KCONFIG_PROBABILITY");
188
189 n = 0;
190 while (env && *env) {
191 char *endp;
192 int tmp = strtol(nptr: env, endptr: &endp, base: 10);
193
194 if (tmp >= 0 && tmp <= 100) {
195 p[n++] = tmp;
196 } else {
197 errno = ERANGE;
198 perror(s: "KCONFIG_PROBABILITY");
199 exit(status: 1);
200 }
201 env = (*endp == ':') ? endp + 1 : endp;
202 if (n >= 3)
203 break;
204 }
205 switch (n) {
206 case 1:
207 pby = p[0];
208 ptm = pby / 2;
209 pty = pby - ptm;
210 break;
211 case 2:
212 pty = p[0];
213 ptm = p[1];
214 pby = pty + ptm;
215 break;
216 case 3:
217 pby = p[0];
218 pty = p[1];
219 ptm = p[2];
220 break;
221 }
222
223 if (pty + ptm > 100) {
224 errno = ERANGE;
225 perror(s: "KCONFIG_PROBABILITY");
226 exit(status: 1);
227 }
228 }
229
230 for_all_symbols(sym) {
231 if (sym_has_value(sym) || sym->flags & SYMBOL_VALID)
232 continue;
233 switch (sym_get_type(sym)) {
234 case S_BOOLEAN:
235 case S_TRISTATE:
236 has_changed = true;
237 switch (mode) {
238 case def_yes:
239 sym->def[S_DEF_USER].tri = yes;
240 break;
241 case def_mod:
242 sym->def[S_DEF_USER].tri = mod;
243 break;
244 case def_no:
245 sym->def[S_DEF_USER].tri = no;
246 break;
247 case def_random:
248 sym->def[S_DEF_USER].tri = no;
249 cnt = rand() % 100;
250 if (sym->type == S_TRISTATE) {
251 if (cnt < pty)
252 sym->def[S_DEF_USER].tri = yes;
253 else if (cnt < pty + ptm)
254 sym->def[S_DEF_USER].tri = mod;
255 } else if (cnt < pby)
256 sym->def[S_DEF_USER].tri = yes;
257 break;
258 default:
259 continue;
260 }
261 if (!(sym_is_choice(sym) && mode == def_random))
262 sym->flags |= SYMBOL_DEF_USER;
263 break;
264 default:
265 break;
266 }
267
268 }
269
270 sym_clear_all_valid();
271
272 /*
273 * We have different type of choice blocks.
274 * If curr.tri equals to mod then we can select several
275 * choice symbols in one block.
276 * In this case we do nothing.
277 * If curr.tri equals yes then only one symbol can be
278 * selected in a choice block and we set it to yes,
279 * and the rest to no.
280 */
281 if (mode != def_random) {
282 for_all_symbols(csym) {
283 if ((sym_is_choice(sym: csym) && !sym_has_value(sym: csym)) ||
284 sym_is_choice_value(sym: csym))
285 csym->flags |= SYMBOL_NEED_SET_CHOICE_VALUES;
286 }
287 }
288
289 for_all_symbols(csym) {
290 if (sym_has_value(sym: csym) || !sym_is_choice(sym: csym))
291 continue;
292
293 sym_calc_value(sym: csym);
294 if (mode == def_random)
295 has_changed |= randomize_choice_values(csym);
296 else {
297 set_all_choice_values(csym);
298 has_changed = true;
299 }
300 }
301
302 return has_changed;
303}
304
305static void conf_rewrite_tristates(tristate old_val, tristate new_val)
306{
307 struct symbol *sym;
308
309 for_all_symbols(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
317static int conf_askvalue(struct symbol *sym, const char *def)
318{
319 if (!sym_has_value(sym))
320 printf(format: "(NEW) ");
321
322 line[0] = '\n';
323 line[1] = 0;
324
325 if (!sym_is_changeable(sym)) {
326 printf(format: "%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(format: "%s\n", def);
337 return 0;
338 }
339 /* fall through */
340 default:
341 fflush(stdout);
342 xfgets(str: line, size: sizeof(line), stdin);
343 break;
344 }
345
346 return 1;
347}
348
349static int conf_string(struct menu *menu)
350{
351 struct symbol *sym = menu->sym;
352 const char *def;
353
354 while (1) {
355 printf(format: "%*s%s ", indent - 1, "", menu->prompt->text);
356 printf(format: "(%s) ", sym->name);
357 def = sym_get_string_value(sym);
358 if (def)
359 printf(format: "[%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(s: line)-1] = 0;
375 def = line;
376 }
377 if (def && sym_set_string_value(sym, newval: def))
378 return 0;
379 }
380}
381
382static int conf_sym(struct menu *menu)
383{
384 struct symbol *sym = menu->sym;
385 tristate oldval, newval;
386
387 while (1) {
388 printf(format: "%*s%s ", indent - 1, "", menu->prompt->text);
389 if (sym->name)
390 printf(format: "(%s) ", sym->name);
391 putchar(c: '[');
392 oldval = sym_get_tristate_value(sym);
393 switch (oldval) {
394 case no:
395 putchar(c: 'N');
396 break;
397 case mod:
398 putchar(c: 'M');
399 break;
400 case yes:
401 putchar(c: 'Y');
402 break;
403 }
404 if (oldval != no && sym_tristate_within_range(sym, tri: no))
405 printf(format: "/n");
406 if (oldval != mod && sym_tristate_within_range(sym, tri: mod))
407 printf(format: "/m");
408 if (oldval != yes && sym_tristate_within_range(sym, tri: yes))
409 printf(format: "/y");
410 printf(format: "/?] ");
411 if (!conf_askvalue(sym, def: sym_get_string_value(sym)))
412 return 0;
413 strip(str: line);
414
415 switch (line[0]) {
416 case 'n':
417 case 'N':
418 newval = no;
419 if (!line[1] || !strcmp(s1: &line[1], s2: "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(s1: &line[1], s2: "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, tri: newval))
443 return 0;
444help:
445 print_help(menu);
446 }
447}
448
449static 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(format: "%*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(format: "%*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(menu: child))
489 continue;
490 if (!child->sym) {
491 printf(format: "%*c %s\n", indent, '*', menu_get_prompt(menu: child));
492 continue;
493 }
494 cnt++;
495 if (child->sym == def_sym) {
496 def = cnt;
497 printf(format: "%*c", indent, '>');
498 } else
499 printf(format: "%*c", indent, ' ');
500 printf(format: " %d. %s", cnt, menu_get_prompt(menu: child));
501 if (child->sym->name)
502 printf(format: " (%s)", child->sym->name);
503 if (!sym_has_value(sym: child->sym))
504 printf(format: " (NEW)");
505 printf(format: "\n");
506 }
507 printf(format: "%*schoice", indent - 1, "");
508 if (cnt == 1) {
509 printf(format: "[1]: 1\n");
510 goto conf_childs;
511 }
512 printf(format: "[1-%d?]: ", cnt);
513 switch (input_mode) {
514 case oldconfig:
515 case syncconfig:
516 if (!is_new) {
517 cnt = def;
518 printf(format: "%d\n", cnt);
519 break;
520 }
521 /* fall through */
522 case oldaskconfig:
523 fflush(stdout);
524 xfgets(str: line, size: sizeof(line), stdin);
525 strip(str: 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(nptr: 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(menu: child))
544 continue;
545 if (!--cnt)
546 break;
547 }
548 if (!child)
549 continue;
550 if (line[0] && line[strlen(s: line) - 1] == '?') {
551 print_help(menu: child);
552 continue;
553 }
554 sym_set_tristate_value(sym: child->sym, tri: yes);
555 return 1;
556 }
557}
558
559static void conf(struct menu *menu)
560{
561 struct symbol *sym;
562 struct property *prop;
563 struct menu *child;
564
565 if (!menu_is_visible(menu))
566 return;
567
568 sym = menu->sym;
569 prop = menu->prompt;
570 if (prop) {
571 const char *prompt;
572
573 switch (prop->type) {
574 case P_MENU:
575 /*
576 * Except in oldaskconfig mode, we show only menus that
577 * contain new symbols.
578 */
579 if (input_mode != oldaskconfig && rootEntry != menu) {
580 check_conf(menu);
581 return;
582 }
583 /* fall through */
584 case P_COMMENT:
585 prompt = menu_get_prompt(menu);
586 if (prompt)
587 printf(format: "%*c\n%*c %s\n%*c\n",
588 indent, '*',
589 indent, '*', prompt,
590 indent, '*');
591 default:
592 ;
593 }
594 }
595
596 if (!sym)
597 goto conf_childs;
598
599 if (sym_is_choice(sym)) {
600 conf_choice(menu);
601 if (sym->curr.tri != mod)
602 return;
603 goto conf_childs;
604 }
605
606 switch (sym->type) {
607 case S_INT:
608 case S_HEX:
609 case S_STRING:
610 conf_string(menu);
611 break;
612 default:
613 conf_sym(menu);
614 break;
615 }
616
617conf_childs:
618 if (sym)
619 indent += 2;
620 for (child = menu->list; child; child = child->next)
621 conf(menu: child);
622 if (sym)
623 indent -= 2;
624}
625
626static void check_conf(struct menu *menu)
627{
628 struct symbol *sym;
629 struct menu *child;
630
631 if (!menu_is_visible(menu))
632 return;
633
634 sym = menu->sym;
635 if (sym && !sym_has_value(sym) &&
636 (sym_is_changeable(sym) ||
637 (sym_is_choice(sym) && sym_get_tristate_value(sym) == yes))) {
638
639 switch (input_mode) {
640 case listnewconfig:
641 if (sym->name)
642 print_symbol_for_listconfig(sym);
643 break;
644 case helpnewconfig:
645 printf(format: "-----\n");
646 print_help(menu);
647 printf(format: "-----\n");
648 break;
649 default:
650 if (!conf_cnt++)
651 printf(format: "*\n* Restart config...\n*\n");
652 rootEntry = menu_get_parent_menu(menu);
653 conf(menu: rootEntry);
654 break;
655 }
656 }
657
658 for (child = menu->list; child; child = child->next)
659 check_conf(menu: child);
660}
661
662static const struct option long_opts[] = {
663 {"help", no_argument, NULL, 'h'},
664 {"silent", no_argument, NULL, 's'},
665 {"oldaskconfig", no_argument, &input_mode_opt, oldaskconfig},
666 {"oldconfig", no_argument, &input_mode_opt, oldconfig},
667 {"syncconfig", no_argument, &input_mode_opt, syncconfig},
668 {"defconfig", required_argument, &input_mode_opt, defconfig},
669 {"savedefconfig", required_argument, &input_mode_opt, savedefconfig},
670 {"allnoconfig", no_argument, &input_mode_opt, allnoconfig},
671 {"allyesconfig", no_argument, &input_mode_opt, allyesconfig},
672 {"allmodconfig", no_argument, &input_mode_opt, allmodconfig},
673 {"alldefconfig", no_argument, &input_mode_opt, alldefconfig},
674 {"randconfig", no_argument, &input_mode_opt, randconfig},
675 {"listnewconfig", no_argument, &input_mode_opt, listnewconfig},
676 {"helpnewconfig", no_argument, &input_mode_opt, helpnewconfig},
677 {"olddefconfig", no_argument, &input_mode_opt, olddefconfig},
678 {"yes2modconfig", no_argument, &input_mode_opt, yes2modconfig},
679 {"mod2yesconfig", no_argument, &input_mode_opt, mod2yesconfig},
680 {"mod2noconfig", no_argument, &input_mode_opt, mod2noconfig},
681 {NULL, 0, NULL, 0}
682};
683
684static void conf_usage(const char *progname)
685{
686 printf(format: "Usage: %s [options] <kconfig-file>\n", progname);
687 printf(format: "\n");
688 printf(format: "Generic options:\n");
689 printf(format: " -h, --help Print this message and exit.\n");
690 printf(format: " -s, --silent Do not print log.\n");
691 printf(format: "\n");
692 printf(format: "Mode options:\n");
693 printf(format: " --listnewconfig List new options\n");
694 printf(format: " --helpnewconfig List new options and help text\n");
695 printf(format: " --oldaskconfig Start a new configuration using a line-oriented program\n");
696 printf(format: " --oldconfig Update a configuration using a provided .config as base\n");
697 printf(format: " --syncconfig Similar to oldconfig but generates configuration in\n"
698 " include/{generated/,config/}\n");
699 printf(format: " --olddefconfig Same as oldconfig but sets new symbols to their default value\n");
700 printf(format: " --defconfig <file> New config with default defined in <file>\n");
701 printf(format: " --savedefconfig <file> Save the minimal current configuration to <file>\n");
702 printf(format: " --allnoconfig New config where all options are answered with no\n");
703 printf(format: " --allyesconfig New config where all options are answered with yes\n");
704 printf(format: " --allmodconfig New config where all options are answered with mod\n");
705 printf(format: " --alldefconfig New config with all symbols set to default\n");
706 printf(format: " --randconfig New config with random answer to all options\n");
707 printf(format: " --yes2modconfig Change answers from yes to mod if possible\n");
708 printf(format: " --mod2yesconfig Change answers from mod to yes if possible\n");
709 printf(format: " --mod2noconfig Change answers from mod to no if possible\n");
710 printf(format: " (If none of the above is given, --oldaskconfig is the default)\n");
711}
712
713int main(int ac, char **av)
714{
715 const char *progname = av[0];
716 int opt;
717 const char *name, *defconfig_file = NULL /* gcc uninit */;
718 int no_conf_write = 0;
719
720 tty_stdio = isatty(fd: 0) && isatty(fd: 1);
721
722 while ((opt = getopt_long(argc: ac, argv: av, shortopts: "hs", longopts: long_opts, NULL)) != -1) {
723 switch (opt) {
724 case 'h':
725 conf_usage(progname);
726 exit(status: 1);
727 break;
728 case 's':
729 conf_set_message_callback(NULL);
730 break;
731 case 0:
732 input_mode = input_mode_opt;
733 switch (input_mode) {
734 case syncconfig:
735 /*
736 * syncconfig is invoked during the build stage.
737 * Suppress distracting
738 * "configuration written to ..."
739 */
740 conf_set_message_callback(NULL);
741 sync_kconfig = 1;
742 break;
743 case defconfig:
744 case savedefconfig:
745 defconfig_file = optarg;
746 break;
747 case randconfig:
748 set_randconfig_seed();
749 break;
750 default:
751 break;
752 }
753 default:
754 break;
755 }
756 }
757 if (ac == optind) {
758 fprintf(stderr, format: "%s: Kconfig file missing\n", av[0]);
759 conf_usage(progname);
760 exit(status: 1);
761 }
762 conf_parse(name: av[optind]);
763 //zconfdump(stdout);
764
765 switch (input_mode) {
766 case defconfig:
767 if (conf_read(name: defconfig_file)) {
768 fprintf(stderr,
769 format: "***\n"
770 "*** Can't find default configuration \"%s\"!\n"
771 "***\n",
772 defconfig_file);
773 exit(status: 1);
774 }
775 break;
776 case savedefconfig:
777 case syncconfig:
778 case oldaskconfig:
779 case oldconfig:
780 case listnewconfig:
781 case helpnewconfig:
782 case olddefconfig:
783 case yes2modconfig:
784 case mod2yesconfig:
785 case mod2noconfig:
786 conf_read(NULL);
787 break;
788 case allnoconfig:
789 case allyesconfig:
790 case allmodconfig:
791 case alldefconfig:
792 case randconfig:
793 name = getenv(name: "KCONFIG_ALLCONFIG");
794 if (!name)
795 break;
796 if ((strcmp(s1: name, s2: "") != 0) && (strcmp(s1: name, s2: "1") != 0)) {
797 if (conf_read_simple(name, S_DEF_USER)) {
798 fprintf(stderr,
799 format: "*** Can't read seed configuration \"%s\"!\n",
800 name);
801 exit(status: 1);
802 }
803 break;
804 }
805 switch (input_mode) {
806 case allnoconfig: name = "allno.config"; break;
807 case allyesconfig: name = "allyes.config"; break;
808 case allmodconfig: name = "allmod.config"; break;
809 case alldefconfig: name = "alldef.config"; break;
810 case randconfig: name = "allrandom.config"; break;
811 default: break;
812 }
813 if (conf_read_simple(name, S_DEF_USER) &&
814 conf_read_simple(name: "all.config", S_DEF_USER)) {
815 fprintf(stderr,
816 format: "*** KCONFIG_ALLCONFIG set, but no \"%s\" or \"all.config\" file found\n",
817 name);
818 exit(status: 1);
819 }
820 break;
821 default:
822 break;
823 }
824
825 if (conf_errors())
826 exit(status: 1);
827
828 if (sync_kconfig) {
829 name = getenv(name: "KCONFIG_NOSILENTUPDATE");
830 if (name && *name) {
831 if (conf_get_changed()) {
832 fprintf(stderr,
833 format: "\n*** The configuration requires explicit update.\n\n");
834 return 1;
835 }
836 no_conf_write = 1;
837 }
838 }
839
840 switch (input_mode) {
841 case allnoconfig:
842 conf_set_all_new_symbols(mode: def_no);
843 break;
844 case allyesconfig:
845 conf_set_all_new_symbols(mode: def_yes);
846 break;
847 case allmodconfig:
848 conf_set_all_new_symbols(mode: def_mod);
849 break;
850 case alldefconfig:
851 conf_set_all_new_symbols(mode: def_default);
852 break;
853 case randconfig:
854 /* Really nothing to do in this loop */
855 while (conf_set_all_new_symbols(mode: def_random)) ;
856 break;
857 case defconfig:
858 conf_set_all_new_symbols(mode: def_default);
859 break;
860 case savedefconfig:
861 break;
862 case yes2modconfig:
863 conf_rewrite_tristates(old_val: yes, new_val: mod);
864 break;
865 case mod2yesconfig:
866 conf_rewrite_tristates(old_val: mod, new_val: yes);
867 break;
868 case mod2noconfig:
869 conf_rewrite_tristates(old_val: mod, new_val: no);
870 break;
871 case oldaskconfig:
872 rootEntry = &rootmenu;
873 conf(menu: &rootmenu);
874 input_mode = oldconfig;
875 /* fall through */
876 case oldconfig:
877 case listnewconfig:
878 case helpnewconfig:
879 case syncconfig:
880 /* Update until a loop caused no more changes */
881 do {
882 conf_cnt = 0;
883 check_conf(menu: &rootmenu);
884 } while (conf_cnt);
885 break;
886 case olddefconfig:
887 default:
888 break;
889 }
890
891 if (sym_dep_errors())
892 exit(status: 1);
893
894 if (input_mode == savedefconfig) {
895 if (conf_write_defconfig(name: defconfig_file)) {
896 fprintf(stderr, format: "n*** Error while saving defconfig to: %s\n\n",
897 defconfig_file);
898 return 1;
899 }
900 } else if (input_mode != listnewconfig && input_mode != helpnewconfig) {
901 if (!no_conf_write && conf_write(NULL)) {
902 fprintf(stderr, format: "\n*** Error during writing of the configuration.\n\n");
903 exit(status: 1);
904 }
905
906 /*
907 * Create auto.conf if it does not exist.
908 * This prevents GNU Make 4.1 or older from emitting
909 * "include/config/auto.conf: No such file or directory"
910 * in the top-level Makefile
911 *
912 * syncconfig always creates or updates auto.conf because it is
913 * used during the build.
914 */
915 if (conf_write_autoconf(overwrite: sync_kconfig) && sync_kconfig) {
916 fprintf(stderr,
917 format: "\n*** Error during sync of the configuration.\n\n");
918 return 1;
919 }
920 }
921 return 0;
922}
923

source code of linux/scripts/kconfig/conf.c