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memcg: remove a redundant check
[linux-2.6/mini2440.git] / scripts / kconfig / confdata.c
blobee5fe943d58db0eda374b91a8181e5991d8cf23b
1 /*
2 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
3 * Released under the terms of the GNU GPL v2.0.
4 */
5
6 #include <sys/stat.h>
7 #include <ctype.h>
8 #include <fcntl.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <string.h>
12 #include <time.h>
13 #include <unistd.h>
14
15 #define LKC_DIRECT_LINK
16 #include "lkc.h"
17
18 static void conf_warning(const char *fmt, ...)
19 __attribute__ ((format (printf, 1, 2)));
20
21 static const char *conf_filename;
22 static int conf_lineno, conf_warnings, conf_unsaved;
23
24 const char conf_defname[] = "arch/$ARCH/defconfig";
25
26 static void conf_warning(const char *fmt, ...)
27 {
28 va_list ap;
29 va_start(ap, fmt);
30 fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
31 vfprintf(stderr, fmt, ap);
32 fprintf(stderr, "\n");
33 va_end(ap);
34 conf_warnings++;
35 }
36
37 const char *conf_get_configname(void)
38 {
39 char *name = getenv("KCONFIG_CONFIG");
40
41 return name ? name : ".config";
42 }
43
44 static char *conf_expand_value(const char *in)
45 {
46 struct symbol *sym;
47 const char *src;
48 static char res_value[SYMBOL_MAXLENGTH];
49 char *dst, name[SYMBOL_MAXLENGTH];
50
51 res_value[0] = 0;
52 dst = name;
53 while ((src = strchr(in, '$'))) {
54 strncat(res_value, in, src - in);
55 src++;
56 dst = name;
57 while (isalnum(*src) || *src == '_')
58 *dst++ = *src++;
59 *dst = 0;
60 sym = sym_lookup(name, 0);
61 sym_calc_value(sym);
62 strcat(res_value, sym_get_string_value(sym));
63 in = src;
64 }
65 strcat(res_value, in);
66
67 return res_value;
68 }
69
70 char *conf_get_default_confname(void)
71 {
72 struct stat buf;
73 static char fullname[PATH_MAX+1];
74 char *env, *name;
75
76 name = conf_expand_value(conf_defname);
77 env = getenv(SRCTREE);
78 if (env) {
79 sprintf(fullname, "%s/%s", env, name);
80 if (!stat(fullname, &buf))
81 return fullname;
82 }
83 return name;
84 }
85
86 static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
87 {
88 char *p2;
89
90 switch (sym->type) {
91 case S_TRISTATE:
92 if (p[0] == 'm') {
93 sym->def[def].tri = mod;
94 sym->flags |= def_flags;
95 break;
96 }
97 case S_BOOLEAN:
98 if (p[0] == 'y') {
99 sym->def[def].tri = yes;
100 sym->flags |= def_flags;
101 break;
102 }
103 if (p[0] == 'n') {
104 sym->def[def].tri = no;
105 sym->flags |= def_flags;
106 break;
107 }
108 conf_warning("symbol value '%s' invalid for %s", p, sym->name);
109 break;
110 case S_OTHER:
111 if (*p != '"') {
112 for (p2 = p; *p2 && !isspace(*p2); p2++)
113 ;
114 sym->type = S_STRING;
115 goto done;
116 }
117 case S_STRING:
118 if (*p++ != '"')
119 break;
120 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
121 if (*p2 == '"') {
122 *p2 = 0;
123 break;
124 }
125 memmove(p2, p2 + 1, strlen(p2));
126 }
127 if (!p2) {
128 conf_warning("invalid string found");
129 return 1;
130 }
131 case S_INT:
132 case S_HEX:
133 done:
134 if (sym_string_valid(sym, p)) {
135 sym->def[def].val = strdup(p);
136 sym->flags |= def_flags;
137 } else {
138 conf_warning("symbol value '%s' invalid for %s", p, sym->name);
139 return 1;
140 }
141 break;
142 default:
143 ;
144 }
145 return 0;
146 }
147
148 int conf_read_simple(const char *name, int def)
149 {
150 FILE *in = NULL;
151 char line[1024];
152 char *p, *p2;
153 struct symbol *sym;
154 int i, def_flags;
155
156 if (name) {
157 in = zconf_fopen(name);
158 } else {
159 struct property *prop;
160
161 name = conf_get_configname();
162 in = zconf_fopen(name);
163 if (in)
164 goto load;
165 sym_add_change_count(1);
166 if (!sym_defconfig_list)
167 return 1;
168
169 for_all_defaults(sym_defconfig_list, prop) {
170 if (expr_calc_value(prop->visible.expr) == no ||
171 prop->expr->type != E_SYMBOL)
172 continue;
173 name = conf_expand_value(prop->expr->left.sym->name);
174 in = zconf_fopen(name);
175 if (in) {
176 printf(_("#\n"
177 "# using defaults found in %s\n"
178 "#\n"), name);
179 goto load;
180 }
181 }
182 }
183 if (!in)
184 return 1;
185
186 load:
187 conf_filename = name;
188 conf_lineno = 0;
189 conf_warnings = 0;
190 conf_unsaved = 0;
191
192 def_flags = SYMBOL_DEF << def;
193 for_all_symbols(i, sym) {
194 sym->flags |= SYMBOL_CHANGED;
195 sym->flags &= ~(def_flags|SYMBOL_VALID);
196 if (sym_is_choice(sym))
197 sym->flags |= def_flags;
198 switch (sym->type) {
199 case S_INT:
200 case S_HEX:
201 case S_STRING:
202 if (sym->def[def].val)
203 free(sym->def[def].val);
204 default:
205 sym->def[def].val = NULL;
206 sym->def[def].tri = no;
207 }
208 }
209
210 while (fgets(line, sizeof(line), in)) {
211 conf_lineno++;
212 sym = NULL;
213 switch (line[0]) {
214 case '#':
215 if (memcmp(line + 2, "CONFIG_", 7))
216 continue;
217 p = strchr(line + 9, ' ');
218 if (!p)
219 continue;
220 *p++ = 0;
221 if (strncmp(p, "is not set", 10))
222 continue;
223 if (def == S_DEF_USER) {
224 sym = sym_find(line + 9);
225 if (!sym) {
226 conf_warning("trying to assign nonexistent symbol %s", line + 9);
227 break;
228 }
229 } else {
230 sym = sym_lookup(line + 9, 0);
231 if (sym->type == S_UNKNOWN)
232 sym->type = S_BOOLEAN;
233 }
234 if (sym->flags & def_flags) {
235 conf_warning("override: reassigning to symbol %s", sym->name);
236 }
237 switch (sym->type) {
238 case S_BOOLEAN:
239 case S_TRISTATE:
240 sym->def[def].tri = no;
241 sym->flags |= def_flags;
242 break;
243 default:
244 ;
245 }
246 break;
247 case 'C':
248 if (memcmp(line, "CONFIG_", 7)) {
249 conf_warning("unexpected data");
250 continue;
251 }
252 p = strchr(line + 7, '=');
253 if (!p)
254 continue;
255 *p++ = 0;
256 p2 = strchr(p, '\n');
257 if (p2) {
258 *p2-- = 0;
259 if (*p2 == '\r')
260 *p2 = 0;
261 }
262 if (def == S_DEF_USER) {
263 sym = sym_find(line + 7);
264 if (!sym) {
265 conf_warning("trying to assign nonexistent symbol %s", line + 7);
266 break;
267 }
268 } else {
269 sym = sym_lookup(line + 7, 0);
270 if (sym->type == S_UNKNOWN)
271 sym->type = S_OTHER;
272 }
273 if (sym->flags & def_flags) {
274 conf_warning("override: reassigning to symbol %s", sym->name);
275 }
276 if (conf_set_sym_val(sym, def, def_flags, p))
277 continue;
278 break;
279 case '\r':
280 case '\n':
281 break;
282 default:
283 conf_warning("unexpected data");
284 continue;
285 }
286 if (sym && sym_is_choice_value(sym)) {
287 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
288 switch (sym->def[def].tri) {
289 case no:
290 break;
291 case mod:
292 if (cs->def[def].tri == yes) {
293 conf_warning("%s creates inconsistent choice state", sym->name);
294 cs->flags &= ~def_flags;
295 }
296 break;
297 case yes:
298 if (cs->def[def].tri != no)
299 conf_warning("override: %s changes choice state", sym->name);
300 cs->def[def].val = sym;
301 break;
302 }
303 cs->def[def].tri = EXPR_OR(cs->def[def].tri, sym->def[def].tri);
304 }
305 }
306 fclose(in);
307
308 if (modules_sym)
309 sym_calc_value(modules_sym);
310 return 0;
311 }
312
313 int conf_read(const char *name)
314 {
315 struct symbol *sym, *choice_sym;
316 struct property *prop;
317 struct expr *e;
318 int i, flags;
319
320 sym_set_change_count(0);
321
322 if (conf_read_simple(name, S_DEF_USER))
323 return 1;
324
325 for_all_symbols(i, sym) {
326 sym_calc_value(sym);
327 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
328 goto sym_ok;
329 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
330 /* check that calculated value agrees with saved value */
331 switch (sym->type) {
332 case S_BOOLEAN:
333 case S_TRISTATE:
334 if (sym->def[S_DEF_USER].tri != sym_get_tristate_value(sym))
335 break;
336 if (!sym_is_choice(sym))
337 goto sym_ok;
338 default:
339 if (!strcmp(sym->curr.val, sym->def[S_DEF_USER].val))
340 goto sym_ok;
341 break;
342 }
343 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
344 /* no previous value and not saved */
345 goto sym_ok;
346 conf_unsaved++;
347 /* maybe print value in verbose mode... */
348 sym_ok:
349 if (!sym_is_choice(sym))
350 continue;
351 /* The choice symbol only has a set value (and thus is not new)
352 * if all its visible childs have values.
353 */
354 prop = sym_get_choice_prop(sym);
355 flags = sym->flags;
356 expr_list_for_each_sym(prop->expr, e, choice_sym)
357 if (choice_sym->visible != no)
358 flags &= choice_sym->flags;
359 sym->flags &= flags | ~SYMBOL_DEF_USER;
360 }
361
362 for_all_symbols(i, sym) {
363 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
364 /* Reset values of generates values, so they'll appear
365 * as new, if they should become visible, but that
366 * doesn't quite work if the Kconfig and the saved
367 * configuration disagree.
368 */
369 if (sym->visible == no && !conf_unsaved)
370 sym->flags &= ~SYMBOL_DEF_USER;
371 switch (sym->type) {
372 case S_STRING:
373 case S_INT:
374 case S_HEX:
375 /* Reset a string value if it's out of range */
376 if (sym_string_within_range(sym, sym->def[S_DEF_USER].val))
377 break;
378 sym->flags &= ~(SYMBOL_VALID|SYMBOL_DEF_USER);
379 conf_unsaved++;
380 break;
381 default:
382 break;
383 }
384 }
385 }
386
387 sym_add_change_count(conf_warnings || conf_unsaved);
388
389 return 0;
390 }
391
392 int conf_write(const char *name)
393 {
394 FILE *out;
395 struct symbol *sym;
396 struct menu *menu;
397 const char *basename;
398 char dirname[128], tmpname[128], newname[128];
399 int type, l;
400 const char *str;
401 time_t now;
402 int use_timestamp = 1;
403 char *env;
404
405 dirname[0] = 0;
406 if (name && name[0]) {
407 struct stat st;
408 char *slash;
409
410 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
411 strcpy(dirname, name);
412 strcat(dirname, "/");
413 basename = conf_get_configname();
414 } else if ((slash = strrchr(name, '/'))) {
415 int size = slash - name + 1;
416 memcpy(dirname, name, size);
417 dirname[size] = 0;
418 if (slash[1])
419 basename = slash + 1;
420 else
421 basename = conf_get_configname();
422 } else
423 basename = name;
424 } else
425 basename = conf_get_configname();
426
427 sprintf(newname, "%s%s", dirname, basename);
428 env = getenv("KCONFIG_OVERWRITECONFIG");
429 if (!env || !*env) {
430 sprintf(tmpname, "%s.tmpconfig.%d", dirname, (int)getpid());
431 out = fopen(tmpname, "w");
432 } else {
433 *tmpname = 0;
434 out = fopen(newname, "w");
435 }
436 if (!out)
437 return 1;
438
439 sym = sym_lookup("KERNELVERSION", 0);
440 sym_calc_value(sym);
441 time(&now);
442 env = getenv("KCONFIG_NOTIMESTAMP");
443 if (env && *env)
444 use_timestamp = 0;
445
446 fprintf(out, _("#\n"
447 "# Automatically generated make config: don't edit\n"
448 "# Linux kernel version: %s\n"
449 "%s%s"
450 "#\n"),
451 sym_get_string_value(sym),
452 use_timestamp ? "# " : "",
453 use_timestamp ? ctime(&now) : "");
454
455 if (!conf_get_changed())
456 sym_clear_all_valid();
457
458 menu = rootmenu.list;
459 while (menu) {
460 sym = menu->sym;
461 if (!sym) {
462 if (!menu_is_visible(menu))
463 goto next;
464 str = menu_get_prompt(menu);
465 fprintf(out, "\n"
466 "#\n"
467 "# %s\n"
468 "#\n", str);
469 } else if (!(sym->flags & SYMBOL_CHOICE)) {
470 sym_calc_value(sym);
471 if (!(sym->flags & SYMBOL_WRITE))
472 goto next;
473 sym->flags &= ~SYMBOL_WRITE;
474 type = sym->type;
475 if (type == S_TRISTATE) {
476 sym_calc_value(modules_sym);
477 if (modules_sym->curr.tri == no)
478 type = S_BOOLEAN;
479 }
480 switch (type) {
481 case S_BOOLEAN:
482 case S_TRISTATE:
483 switch (sym_get_tristate_value(sym)) {
484 case no:
485 fprintf(out, "# CONFIG_%s is not set\n", sym->name);
486 break;
487 case mod:
488 fprintf(out, "CONFIG_%s=m\n", sym->name);
489 break;
490 case yes:
491 fprintf(out, "CONFIG_%s=y\n", sym->name);
492 break;
493 }
494 break;
495 case S_STRING:
496 str = sym_get_string_value(sym);
497 fprintf(out, "CONFIG_%s=\"", sym->name);
498 while (1) {
499 l = strcspn(str, "\"\\");
500 if (l) {
501 fwrite(str, l, 1, out);
502 str += l;
503 }
504 if (!*str)
505 break;
506 fprintf(out, "\\%c", *str++);
507 }
508 fputs("\"\n", out);
509 break;
510 case S_HEX:
511 str = sym_get_string_value(sym);
512 if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
513 fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
514 break;
515 }
516 case S_INT:
517 str = sym_get_string_value(sym);
518 fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
519 break;
520 }
521 }
522
523 next:
524 if (menu->list) {
525 menu = menu->list;
526 continue;
527 }
528 if (menu->next)
529 menu = menu->next;
530 else while ((menu = menu->parent)) {
531 if (menu->next) {
532 menu = menu->next;
533 break;
534 }
535 }
536 }
537 fclose(out);
538
539 if (*tmpname) {
540 strcat(dirname, basename);
541 strcat(dirname, ".old");
542 rename(newname, dirname);
543 if (rename(tmpname, newname))
544 return 1;
545 }
546
547 printf(_("#\n"
548 "# configuration written to %s\n"
549 "#\n"), newname);
550
551 sym_set_change_count(0);
552
553 return 0;
554 }
555
556 int conf_split_config(void)
557 {
558 char *name, path[128];
559 char *s, *d, c;
560 struct symbol *sym;
561 struct stat sb;
562 int res, i, fd;
563
564 name = getenv("KCONFIG_AUTOCONFIG");
565 if (!name)
566 name = "include/config/auto.conf";
567 conf_read_simple(name, S_DEF_AUTO);
568
569 if (chdir("include/config"))
570 return 1;
571
572 res = 0;
573 for_all_symbols(i, sym) {
574 sym_calc_value(sym);
575 if ((sym->flags & SYMBOL_AUTO) || !sym->name)
576 continue;
577 if (sym->flags & SYMBOL_WRITE) {
578 if (sym->flags & SYMBOL_DEF_AUTO) {
579 /*
580 * symbol has old and new value,
581 * so compare them...
582 */
583 switch (sym->type) {
584 case S_BOOLEAN:
585 case S_TRISTATE:
586 if (sym_get_tristate_value(sym) ==
587 sym->def[S_DEF_AUTO].tri)
588 continue;
589 break;
590 case S_STRING:
591 case S_HEX:
592 case S_INT:
593 if (!strcmp(sym_get_string_value(sym),
594 sym->def[S_DEF_AUTO].val))
595 continue;
596 break;
597 default:
598 break;
599 }
600 } else {
601 /*
602 * If there is no old value, only 'no' (unset)
603 * is allowed as new value.
604 */
605 switch (sym->type) {
606 case S_BOOLEAN:
607 case S_TRISTATE:
608 if (sym_get_tristate_value(sym) == no)
609 continue;
610 break;
611 default:
612 break;
613 }
614 }
615 } else if (!(sym->flags & SYMBOL_DEF_AUTO))
616 /* There is neither an old nor a new value. */
617 continue;
618 /* else
619 * There is an old value, but no new value ('no' (unset)
620 * isn't saved in auto.conf, so the old value is always
621 * different from 'no').
622 */
623
624 /* Replace all '_' and append ".h" */
625 s = sym->name;
626 d = path;
627 while ((c = *s++)) {
628 c = tolower(c);
629 *d++ = (c == '_') ? '/' : c;
630 }
631 strcpy(d, ".h");
632
633 /* Assume directory path already exists. */
634 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
635 if (fd == -1) {
636 if (errno != ENOENT) {
637 res = 1;
638 break;
639 }
640 /*
641 * Create directory components,
642 * unless they exist already.
643 */
644 d = path;
645 while ((d = strchr(d, '/'))) {
646 *d = 0;
647 if (stat(path, &sb) && mkdir(path, 0755)) {
648 res = 1;
649 goto out;
650 }
651 *d++ = '/';
652 }
653 /* Try it again. */
654 fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
655 if (fd == -1) {
656 res = 1;
657 break;
658 }
659 }
660 close(fd);
661 }
662 out:
663 if (chdir("../.."))
664 return 1;
665
666 return res;
667 }
668
669 int conf_write_autoconf(void)
670 {
671 struct symbol *sym;
672 const char *str;
673 char *name;
674 FILE *out, *out_h;
675 time_t now;
676 int i, l;
677
678 sym_clear_all_valid();
679
680 file_write_dep("include/config/auto.conf.cmd");
681
682 if (conf_split_config())
683 return 1;
684
685 out = fopen(".tmpconfig", "w");
686 if (!out)
687 return 1;
688
689 out_h = fopen(".tmpconfig.h", "w");
690 if (!out_h) {
691 fclose(out);
692 return 1;
693 }
694
695 sym = sym_lookup("KERNELVERSION", 0);
696 sym_calc_value(sym);
697 time(&now);
698 fprintf(out, "#\n"
699 "# Automatically generated make config: don't edit\n"
700 "# Linux kernel version: %s\n"
701 "# %s"
702 "#\n",
703 sym_get_string_value(sym), ctime(&now));
704 fprintf(out_h, "/*\n"
705 " * Automatically generated C config: don't edit\n"
706 " * Linux kernel version: %s\n"
707 " * %s"
708 " */\n"
709 "#define AUTOCONF_INCLUDED\n",
710 sym_get_string_value(sym), ctime(&now));
711
712 for_all_symbols(i, sym) {
713 sym_calc_value(sym);
714 if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
715 continue;
716 switch (sym->type) {
717 case S_BOOLEAN:
718 case S_TRISTATE:
719 switch (sym_get_tristate_value(sym)) {
720 case no:
721 break;
722 case mod:
723 fprintf(out, "CONFIG_%s=m\n", sym->name);
724 fprintf(out_h, "#define CONFIG_%s_MODULE 1\n", sym->name);
725 break;
726 case yes:
727 fprintf(out, "CONFIG_%s=y\n", sym->name);
728 fprintf(out_h, "#define CONFIG_%s 1\n", sym->name);
729 break;
730 }
731 break;
732 case S_STRING:
733 str = sym_get_string_value(sym);
734 fprintf(out, "CONFIG_%s=\"", sym->name);
735 fprintf(out_h, "#define CONFIG_%s \"", sym->name);
736 while (1) {
737 l = strcspn(str, "\"\\");
738 if (l) {
739 fwrite(str, l, 1, out);
740 fwrite(str, l, 1, out_h);
741 str += l;
742 }
743 if (!*str)
744 break;
745 fprintf(out, "\\%c", *str);
746 fprintf(out_h, "\\%c", *str);
747 str++;
748 }
749 fputs("\"\n", out);
750 fputs("\"\n", out_h);
751 break;
752 case S_HEX:
753 str = sym_get_string_value(sym);
754 if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
755 fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
756 fprintf(out_h, "#define CONFIG_%s 0x%s\n", sym->name, str);
757 break;
758 }
759 case S_INT:
760 str = sym_get_string_value(sym);
761 fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
762 fprintf(out_h, "#define CONFIG_%s %s\n", sym->name, str);
763 break;
764 default:
765 break;
766 }
767 }
768 fclose(out);
769 fclose(out_h);
770
771 name = getenv("KCONFIG_AUTOHEADER");
772 if (!name)
773 name = "include/linux/autoconf.h";
774 if (rename(".tmpconfig.h", name))
775 return 1;
776 name = getenv("KCONFIG_AUTOCONFIG");
777 if (!name)
778 name = "include/config/auto.conf";
779 /*
780 * This must be the last step, kbuild has a dependency on auto.conf
781 * and this marks the successful completion of the previous steps.
782 */
783 if (rename(".tmpconfig", name))
784 return 1;
785
786 return 0;
787 }
788
789 static int sym_change_count;
790 static void (*conf_changed_callback)(void);
791
792 void sym_set_change_count(int count)
793 {
794 int _sym_change_count = sym_change_count;
795 sym_change_count = count;
796 if (conf_changed_callback &&
797 (bool)_sym_change_count != (bool)count)
798 conf_changed_callback();
799 }
800
801 void sym_add_change_count(int count)
802 {
803 sym_set_change_count(count + sym_change_count);
804 }
805
806 bool conf_get_changed(void)
807 {
808 return sym_change_count;
809 }
810
811 void conf_set_changed_callback(void (*fn)(void))
812 {
813 conf_changed_callback = fn;
814 }
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