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