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5
6#include <sys/stat.h>
7#include <ctype.h>
8#include <stdio.h>
9#include <stdlib.h>
10#include <string.h>
11#include <time.h>
12#include <unistd.h>
13
14#define LKC_DIRECT_LINK
15#include "lkc.h"
16
17static void conf_warning(const char *fmt, ...)
18 __attribute__ ((format (printf, 1, 2)));
19
20static const char *conf_filename;
21static int conf_lineno, conf_warnings, conf_unsaved;
22
23const char conf_def_filename[] = ".config";
24
25const char conf_defname[] = "/dev/null";
26
27const char *conf_confnames[] = {
28 conf_def_filename,
29 conf_defname,
30 NULL,
31};
32
33static void conf_warning(const char *fmt, ...)
34{
35 va_list ap;
36 va_start(ap, fmt);
37 fprintf(stderr, "%s:%d:warning: ", conf_filename, conf_lineno);
38 vfprintf(stderr, fmt, ap);
39 fprintf(stderr, "\n");
40 va_end(ap);
41 conf_warnings++;
42}
43
44static 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((unsigned char)*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
70char *conf_get_default_confname(void)
71{
72 struct stat buf;
73 static char *fullname = NULL;
74 char *env, *name;
75
76 name = conf_expand_value(conf_defname);
77 env = getenv(SRCTREE);
78 if (env) {
79 fullname = realloc(fullname, strlen(env) + strlen(name) + 2);
80 sprintf(fullname, "%s/%s", env, name);
81 if (!stat(fullname, &buf))
82 return fullname;
83 }
84 return name;
85}
86
87int conf_read_simple(const char *name)
88{
89 FILE *in = NULL;
90 char line[1024];
91 char *p, *p2;
92 struct symbol *sym;
93 int i;
94
95 if (name) {
96 in = zconf_fopen(name);
97 } else {
98 const char **names = conf_confnames;
99 while ((name = *names++)) {
100 name = conf_expand_value(name);
101 in = zconf_fopen(name);
102 if (in) {
103 printf(_("#\n"
104 "# using defaults found in %s\n"
105 "#\n"), name);
106 break;
107 }
108 }
109 }
110 if (!in)
111 return 1;
112
113 conf_filename = name;
114 conf_lineno = 0;
115 conf_warnings = 0;
116 conf_unsaved = 0;
117
118 for_all_symbols(i, sym) {
119 sym->flags |= SYMBOL_NEW | SYMBOL_CHANGED;
120 if (sym_is_choice(sym))
121 sym->flags &= ~SYMBOL_NEW;
122 sym->flags &= ~SYMBOL_VALID;
123 switch (sym->type) {
124 case S_INT:
125 case S_HEX:
126 case S_STRING:
127 free(sym->user.val);
128 default:
129 sym->user.val = NULL;
130 sym->user.tri = no;
131 }
132 }
133
134 while (fgets(line, sizeof(line), in)) {
135 conf_lineno++;
136 sym = NULL;
137 switch (line[0]) {
138 case '#':
139 if (memcmp(line + 2, "CONFIG_", 7))
140 continue;
141 p = strchr(line + 9, ' ');
142 if (!p)
143 continue;
144 *p++ = 0;
145 if (strncmp(p, "is not set", 10))
146 continue;
147 sym = sym_find(line + 9);
148 if (!sym) {
149 conf_warning("trying to assign nonexistent symbol %s", line + 9);
150 break;
151 } else if (!(sym->flags & SYMBOL_NEW)) {
152 conf_warning("trying to reassign symbol %s", sym->name);
153 break;
154 }
155 switch (sym->type) {
156 case S_BOOLEAN:
157 case S_TRISTATE:
158 sym->user.tri = no;
159 sym->flags &= ~SYMBOL_NEW;
160 break;
161 default:
162 ;
163 }
164 break;
165 case 'C':
166 if (memcmp(line, "CONFIG_", 7)) {
167 conf_warning("unexpected data");
168 continue;
169 }
170 p = strchr(line + 7, '=');
171 if (!p)
172 continue;
173 *p++ = 0;
174 p2 = strchr(p, '\n');
175 if (p2)
176 *p2 = 0;
177 sym = sym_find(line + 7);
178 if (!sym) {
179 conf_warning("trying to assign nonexistent symbol %s", line + 7);
180 break;
181 } else if (!(sym->flags & SYMBOL_NEW)) {
182 conf_warning("trying to reassign symbol %s", sym->name);
183 break;
184 }
185 switch (sym->type) {
186 case S_TRISTATE:
187 if (p[0] == 'm') {
188 sym->user.tri = mod;
189 sym->flags &= ~SYMBOL_NEW;
190 break;
191 }
192 case S_BOOLEAN:
193 if (p[0] == 'y') {
194 sym->user.tri = yes;
195 sym->flags &= ~SYMBOL_NEW;
196 break;
197 }
198 if (p[0] == 'n') {
199 sym->user.tri = no;
200 sym->flags &= ~SYMBOL_NEW;
201 break;
202 }
203 conf_warning("symbol value '%s' invalid for %s", p, sym->name);
204 break;
205 case S_STRING:
206 if (*p++ != '"')
207 break;
208 for (p2 = p; (p2 = strpbrk(p2, "\"\\")); p2++) {
209 if (*p2 == '"') {
210 *p2 = 0;
211 break;
212 }
213 memmove(p2, p2 + 1, strlen(p2));
214 }
215 if (!p2) {
216 conf_warning("invalid string found");
217 continue;
218 }
219 case S_INT:
220 case S_HEX:
221 if (sym_string_valid(sym, p)) {
222 sym->user.val = strdup(p);
223 sym->flags &= ~SYMBOL_NEW;
224 } else {
225 if (p[0])
226 conf_warning("symbol value '%s' invalid for %s", p, sym->name);
227 continue;
228 }
229 break;
230 default:
231 ;
232 }
233 break;
234 case '\n':
235 break;
236 default:
237 conf_warning("unexpected data");
238 continue;
239 }
240 if (sym && sym_is_choice_value(sym)) {
241 struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));
242 switch (sym->user.tri) {
243 case no:
244 break;
245 case mod:
246 if (cs->user.tri == yes) {
247 conf_warning("%s creates inconsistent choice state", sym->name);
248 cs->flags |= SYMBOL_NEW;
249 }
250 break;
251 case yes:
252 if (cs->user.tri != no) {
253 conf_warning("%s creates inconsistent choice state", sym->name);
254 cs->flags |= SYMBOL_NEW;
255 } else
256 cs->user.val = sym;
257 break;
258 }
259 cs->user.tri = E_OR(cs->user.tri, sym->user.tri);
260 }
261 }
262 fclose(in);
263
264 if (modules_sym)
265 sym_calc_value(modules_sym);
266 return 0;
267}
268
269int conf_read(const char *name)
270{
271 struct symbol *sym;
272 struct property *prop;
273 struct expr *e;
274 int i;
275
276 if (conf_read_simple(name))
277 return 1;
278
279 for_all_symbols(i, sym) {
280 sym_calc_value(sym);
281 if (sym_is_choice(sym) || (sym->flags & SYMBOL_AUTO))
282 goto sym_ok;
283 if (sym_has_value(sym) && (sym->flags & SYMBOL_WRITE)) {
284
285 switch (sym->type) {
286 case S_BOOLEAN:
287 case S_TRISTATE:
288 if (sym->user.tri != sym_get_tristate_value(sym))
289 break;
290 if (!sym_is_choice(sym))
291 goto sym_ok;
292 default:
293 if (!strcmp(sym->curr.val, sym->user.val))
294 goto sym_ok;
295 break;
296 }
297 } else if (!sym_has_value(sym) && !(sym->flags & SYMBOL_WRITE))
298
299 goto sym_ok;
300 conf_unsaved++;
301
302 sym_ok:
303 if (sym_has_value(sym) && !sym_is_choice_value(sym)) {
304 if (sym->visible == no)
305 sym->flags |= SYMBOL_NEW;
306 switch (sym->type) {
307 case S_STRING:
308 case S_INT:
309 case S_HEX:
310 if (!sym_string_within_range(sym, sym->user.val)) {
311 sym->flags |= SYMBOL_NEW;
312 sym->flags &= ~SYMBOL_VALID;
313 }
314 default:
315 break;
316 }
317 }
318 if (!sym_is_choice(sym))
319 continue;
320 prop = sym_get_choice_prop(sym);
321 for (e = prop->expr; e; e = e->left.expr)
322 if (e->right.sym->visible != no)
323 sym->flags |= e->right.sym->flags & SYMBOL_NEW;
324 }
325
326 sym_change_count = conf_warnings || conf_unsaved;
327
328 return 0;
329}
330
331int conf_write(const char *name)
332{
333 FILE *out, *out_h;
334 struct symbol *sym;
335 struct menu *menu;
336 const char *basename;
337 char dirname[128];
338 char tmpname[256];
339 char newname[256];
340 int type, l;
341 const char *str;
342 time_t now;
343 int use_timestamp = 1;
344 char *env;
345 char *source_date_epoch;
346 struct tm *build_time;
347
348 dirname[0] = 0;
349 if (name && name[0]) {
350 struct stat st;
351 char *slash;
352
353 if (!stat(name, &st) && S_ISDIR(st.st_mode)) {
354 strcpy(dirname, name);
355 strcat(dirname, "/");
356 basename = conf_def_filename;
357 } else if ((slash = strrchr(name, '/'))) {
358 int size = slash - name + 1;
359 memcpy(dirname, name, size);
360 dirname[size] = 0;
361 if (slash[1])
362 basename = slash + 1;
363 else
364 basename = conf_def_filename;
365 } else
366 basename = name;
367 } else
368 basename = conf_def_filename;
369
370 sprintf(newname, "%s.tmpconfig.%d", dirname, (int)getpid());
371 out = fopen(newname, "w");
372 if (!out)
373 return 1;
374 out_h = NULL;
375 if (!name) {
376 out_h = fopen(".tmpconfig.h", "w");
377 if (!out_h)
378 return 1;
379 file_write_dep(NULL);
380 }
381 sym = sym_lookup("KERNELVERSION", 0);
382 sym_calc_value(sym);
383
384 source_date_epoch = getenv("SOURCE_DATE_EPOCH");
385 if (source_date_epoch && *source_date_epoch) {
386 now = strtoull(source_date_epoch, NULL, 10);
387 build_time = gmtime(&now);
388 } else {
389 time(&now);
390 build_time = localtime(&now);
391 }
392
393 env = getenv("KCONFIG_NOTIMESTAMP");
394 if (env && *env)
395 use_timestamp = 0;
396
397 fprintf(out, _("#\n"
398 "# Automatically generated make config: don't edit\n"
399 "# Busybox version: %s\n"
400 "%s%s"
401 "#\n"),
402 sym_get_string_value(sym),
403 use_timestamp ? "# " : "",
404 use_timestamp ? ctime(&now) : "");
405 if (out_h) {
406 char buf[sizeof("#define AUTOCONF_TIMESTAMP "
407 "\"YYYY-MM-DD HH:MM:SS some_timezone\"\n")];
408 buf[0] = '\0';
409 if (use_timestamp) {
410 size_t ret = \
411 strftime(buf, sizeof(buf), "#define AUTOCONF_TIMESTAMP "
412 "\"%Y-%m-%d %H:%M:%S %Z\"\n", build_time);
413
414
415
416
417 if (ret == 0)
418 strftime(buf, sizeof(buf), "#define AUTOCONF_TIMESTAMP "
419 "\"%Y-%m-%d %H:%M:%S\"\n", build_time);
420 } else {
421 strcpy(buf, "#define AUTOCONF_TIMESTAMP \"\"\n");
422 }
423 fprintf(out_h, "/*\n"
424 " * Automatically generated C config: don't edit\n"
425 " * Busybox version: %s\n"
426 " */\n"
427 "%s"
428 "\n",
429 sym_get_string_value(sym),
430 buf);
431 }
432 if (!sym_change_count)
433 sym_clear_all_valid();
434
435 menu = rootmenu.list;
436 while (menu) {
437 sym = menu->sym;
438 if (!sym) {
439 if (!menu_is_visible(menu))
440 goto next;
441 str = menu_get_prompt(menu);
442 fprintf(out, "\n"
443 "#\n"
444 "# %s\n"
445 "#\n", str);
446 if (out_h)
447 fprintf(out_h, "\n"
448 "/*\n"
449 " * %s\n"
450 " */\n", str);
451 } else if (!(sym->flags & SYMBOL_CHOICE)) {
452 sym_calc_value(sym);
453
454
455
456
457 sym->flags &= ~SYMBOL_WRITE;
458 type = sym->type;
459 if (type == S_TRISTATE) {
460 sym_calc_value(modules_sym);
461 if (modules_sym->curr.tri == no)
462 type = S_BOOLEAN;
463 }
464 switch (type) {
465 case S_BOOLEAN:
466 case S_TRISTATE:
467 switch (sym_get_tristate_value(sym)) {
468 case no:
469 fprintf(out, "# CONFIG_%s is not set\n", sym->name);
470 if (out_h) {
471 fprintf(out_h, "#undef CONFIG_%s\n", sym->name);
472
473 fprintf(out_h, "#define ENABLE_%s 0\n", sym->name);
474 fprintf(out_h, "#define IF_%s(...)\n", sym->name);
475 fprintf(out_h, "#define IF_NOT_%s(...) __VA_ARGS__\n", sym->name);
476 }
477 break;
478 case mod:
479 fprintf(out, "CONFIG_%s=m\n", sym->name);
480 if (out_h)
481 fprintf(out_h, "#define CONFIG_%s_MODULE 1\n", sym->name);
482 break;
483 case yes:
484 fprintf(out, "CONFIG_%s=y\n", sym->name);
485 if (out_h) {
486 fprintf(out_h, "#define CONFIG_%s 1\n", sym->name);
487
488 fprintf(out_h, "#define ENABLE_%s 1\n", sym->name);
489 fprintf(out_h, "#ifdef MAKE_SUID\n");
490 fprintf(out_h, "# define IF_%s(...) __VA_ARGS__ \"CONFIG_%s\"\n", sym->name, sym->name);
491 fprintf(out_h, "#else\n");
492 fprintf(out_h, "# define IF_%s(...) __VA_ARGS__\n", sym->name);
493 fprintf(out_h, "#endif\n");
494 fprintf(out_h, "#define IF_NOT_%s(...)\n", sym->name);
495 }
496 break;
497 }
498 break;
499 case S_STRING:
500
501 str = sym_get_string_value(sym);
502 fprintf(out, "CONFIG_%s=\"", sym->name);
503 if (out_h)
504 fprintf(out_h, "#define CONFIG_%s \"", sym->name);
505 do {
506 l = strcspn(str, "\"\\");
507 if (l) {
508 fwrite(str, l, 1, out);
509 if (out_h)
510 fwrite(str, l, 1, out_h);
511 }
512 str += l;
513 while (*str == '\\' || *str == '"') {
514 fprintf(out, "\\%c", *str);
515 if (out_h)
516 fprintf(out_h, "\\%c", *str);
517 str++;
518 }
519 } while (*str);
520 fputs("\"\n", out);
521 if (out_h) {
522 fputs("\"\n", out_h);
523
524 fprintf(out_h, "#define ENABLE_%s 1\n", sym->name);
525 fprintf(out_h, "#ifdef MAKE_SUID\n");
526 fprintf(out_h, "# define IF_%s(...) __VA_ARGS__ \"CONFIG_%s\"\n", sym->name, sym->name);
527 fprintf(out_h, "#else\n");
528 fprintf(out_h, "# define IF_%s(...) __VA_ARGS__\n", sym->name);
529 fprintf(out_h, "#endif\n");
530 fprintf(out_h, "#define IF_NOT_%s(...)\n", sym->name);
531 }
532 break;
533 case S_HEX:
534 str = sym_get_string_value(sym);
535 if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
536 fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
537 if (out_h) {
538 fprintf(out_h, "#define CONFIG_%s 0x%s\n", sym->name, str);
539
540 fprintf(out_h, "#define ENABLE_%s 1\n", sym->name);
541 fprintf(out_h, "#ifdef MAKE_SUID\n");
542 fprintf(out_h, "# define IF_%s(...) __VA_ARGS__ \"CONFIG_%s\"\n", sym->name, sym->name);
543 fprintf(out_h, "#else\n");
544 fprintf(out_h, "# define IF_%s(...) __VA_ARGS__\n", sym->name);
545 fprintf(out_h, "#endif\n");
546 fprintf(out_h, "#define IF_NOT_%s(...)\n", sym->name);
547 }
548 break;
549 }
550 case S_INT:
551 str = sym_get_string_value(sym);
552 if (!str[0])
553 str = "0";
554 fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
555 if (out_h) {
556 fprintf(out_h, "#define CONFIG_%s %s\n", sym->name, str);
557
558 fprintf(out_h, "#define ENABLE_%s 1\n", sym->name);
559 fprintf(out_h, "#ifdef MAKE_SUID\n");
560 fprintf(out_h, "# define IF_%s(...) __VA_ARGS__ \"CONFIG_%s\"\n", sym->name, sym->name);
561 fprintf(out_h, "#else\n");
562 fprintf(out_h, "# define IF_%s(...) __VA_ARGS__\n", sym->name);
563 fprintf(out_h, "#endif\n");
564 fprintf(out_h, "#define IF_NOT_%s(...)\n", sym->name);
565 }
566 break;
567 }
568 }
569
570 next:
571 if (menu->list) {
572 menu = menu->list;
573 continue;
574 }
575 if (menu->next)
576 menu = menu->next;
577 else while ((menu = menu->parent)) {
578 if (menu->next) {
579 menu = menu->next;
580 break;
581 }
582 }
583 }
584 fclose(out);
585 if (out_h) {
586 fclose(out_h);
587 rename(".tmpconfig.h", "include/autoconf.h");
588 }
589 if (!name || basename != conf_def_filename) {
590 if (!name)
591 name = conf_def_filename;
592 sprintf(tmpname, "%s.old", name);
593 rename(name, tmpname);
594 }
595 sprintf(tmpname, "%s%s", dirname, basename);
596 if (rename(newname, tmpname))
597 return 1;
598
599 sym_change_count = 0;
600
601 return 0;
602}
603
