1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1980, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #ifndef lint
33 static const char copyright[] =
34 "@(#) Copyright (c) 1980, 1993\n\
35 The Regents of the University of California. All rights reserved.\n";
36 #endif /* not lint */
37
38 #ifndef lint
39 #if 0
40 static char sccsid[] = "@(#)main.c 8.1 (Berkeley) 6/6/93";
41 #endif
42 #endif /* not lint */
43
44 #include <sys/types.h>
45 #include <sys/stat.h>
46 #include <sys/file.h>
47 #include <sys/mman.h>
48 #include <sys/param.h>
49
50 #include <assert.h>
51 #include <ctype.h>
52 #include <dirent.h>
53 #include <err.h>
54 #include <iostream>
55 #include <sstream>
56 #include <stdio.h>
57 #include <string.h>
58 #include <sysexits.h>
59 #include <unistd.h>
60
61 #include "y.tab.h"
62 #include "config.h"
63 #include "configvers.h"
64
65 #ifndef TRUE
66 #define TRUE (1)
67 #endif
68
69 #ifndef FALSE
70 #define FALSE (0)
71 #endif
72
73 #define CDIR "../compile/"
74
75 char *machinename;
76 char *machinearch;
77
78 struct cfgfile_head cfgfiles;
79 struct cputype_head cputype;
80 struct opt_head opt, mkopt, rmopts;
81 struct opt_list_head otab;
82 struct envvar_head envvars;
83 struct hint_head hints;
84 struct includepath_head includepath;
85
86 char * PREFIX;
87 char destdir[MAXPATHLEN];
88 char srcdir[MAXPATHLEN];
89
90 int debugging;
91 int found_defaults;
92 int incignore;
93
94 /*
95 * Preserve old behaviour in INCLUDE_CONFIG_FILE handling (files are included
96 * literally).
97 */
98 int filebased = 0;
99 int versreq;
100
101 static void configfile(void);
102 static void get_srcdir(void);
103 static void usage(void);
104 static void cleanheaders(char *);
105 static void kernconfdump(const char *);
106 static void badversion(void);
107 static void checkversion(void);
108
109 struct hdr_list {
110 const char *h_name;
111 struct hdr_list *h_next;
112 } *htab;
113
114 static std::stringstream line_buf;
115
116 /*
117 * Config builds a set of files for building a UNIX
118 * system given a description of the desired system.
119 */
120 int
main(int argc,char ** argv)121 main(int argc, char **argv)
122 {
123
124 struct stat buf;
125 int ch, len;
126 char *p;
127 char *kernfile;
128 struct includepath* ipath;
129 int printmachine;
130 bool cust_dest = false;
131
132 printmachine = 0;
133 kernfile = NULL;
134 SLIST_INIT(&includepath);
135 SLIST_INIT(&cputype);
136 SLIST_INIT(&mkopt);
137 SLIST_INIT(&opt);
138 SLIST_INIT(&rmopts);
139 STAILQ_INIT(&cfgfiles);
140 STAILQ_INIT(&dtab);
141 STAILQ_INIT(&fntab);
142 STAILQ_INIT(&ftab);
143 STAILQ_INIT(&hints);
144 STAILQ_INIT(&envvars);
145 while ((ch = getopt(argc, argv, "Cd:gI:mps:Vx:")) != -1)
146 switch (ch) {
147 case 'C':
148 filebased = 1;
149 break;
150 case 'd':
151 if (*destdir == '\0')
152 strlcpy(destdir, optarg, sizeof(destdir));
153 else
154 errx(EXIT_FAILURE, "directory already set");
155 cust_dest = true;
156 break;
157 case 'g':
158 debugging++;
159 break;
160 case 'I':
161 ipath = (struct includepath *) \
162 calloc(1, sizeof (struct includepath));
163 if (ipath == NULL)
164 err(EXIT_FAILURE, "calloc");
165 ipath->path = optarg;
166 SLIST_INSERT_HEAD(&includepath, ipath, path_next);
167 break;
168 case 'm':
169 printmachine = 1;
170 break;
171 case 's':
172 if (*srcdir == '\0')
173 strlcpy(srcdir, optarg, sizeof(srcdir));
174 else
175 errx(EXIT_FAILURE, "src directory already set");
176 break;
177 case 'V':
178 printf("%d\n", CONFIGVERS);
179 exit(0);
180 case 'x':
181 kernfile = optarg;
182 break;
183 case '?':
184 default:
185 usage();
186 }
187 argc -= optind;
188 argv += optind;
189
190 if (kernfile != NULL) {
191 kernconfdump(kernfile);
192 exit(EXIT_SUCCESS);
193 }
194
195 if (argc != 1)
196 usage();
197
198 PREFIX = *argv;
199 if (stat(PREFIX, &buf) != 0 || !S_ISREG(buf.st_mode))
200 err(2, "%s", PREFIX);
201 if (freopen("DEFAULTS", "r", stdin) != NULL) {
202 found_defaults = 1;
203 yyfile = "DEFAULTS";
204 } else {
205 if (freopen(PREFIX, "r", stdin) == NULL)
206 err(2, "%s", PREFIX);
207 yyfile = PREFIX;
208 }
209 if (*destdir != '\0') {
210 len = strlen(destdir);
211 while (len > 1 && destdir[len - 1] == '/')
212 destdir[--len] = '\0';
213 if (*srcdir == '\0')
214 get_srcdir();
215 } else {
216 strlcpy(destdir, CDIR, sizeof(destdir));
217 strlcat(destdir, PREFIX, sizeof(destdir));
218 }
219
220 if (yyparse())
221 exit(3);
222
223 /*
224 * Ensure that required elements (machine, cpu, ident) are present.
225 */
226 if (machinename == NULL) {
227 printf("Specify machine type, e.g. ``machine i386''\n");
228 exit(1);
229 }
230 if (ident == NULL) {
231 printf("no ident line specified\n");
232 exit(1);
233 }
234 if (SLIST_EMPTY(&cputype)) {
235 printf("cpu type must be specified\n");
236 exit(1);
237 }
238 checkversion();
239
240 if (printmachine) {
241 printf("%s\t%s\n",machinename,machinearch);
242 exit(0);
243 }
244
245 /*
246 * Make CDIR directory, if doing a default destination. Some version
247 * control systems delete empty directories and this seemlessly copes.
248 */
249 if (!cust_dest && stat(CDIR, &buf))
250 if (mkdir(CDIR, 0777))
251 err(2, "%s", CDIR);
252 /* Create the compile directory */
253 p = path((char *)NULL);
254 if (stat(p, &buf)) {
255 if (mkdir(p, 0777))
256 err(2, "%s", p);
257 } else if (!S_ISDIR(buf.st_mode))
258 errx(EXIT_FAILURE, "%s isn't a directory", p);
259
260 configfile(); /* put config file into kernel*/
261 options(); /* make options .h files */
262 makefile(); /* build Makefile */
263 makeenv(); /* build env.c */
264 makehints(); /* build hints.c */
265 headers(); /* make a lot of .h files */
266 cleanheaders(p);
267 printf("Kernel build directory is %s\n", p);
268 printf("Don't forget to do ``make cleandepend && make depend''\n");
269 exit(0);
270 }
271
272 /*
273 * get_srcdir
274 * determine the root of the kernel source tree
275 * and save that in srcdir.
276 */
277 static void
get_srcdir(void)278 get_srcdir(void)
279 {
280 struct stat lg, phy;
281 char *p, *pwd;
282 int i;
283
284 if (realpath("../..", srcdir) == NULL)
285 err(EXIT_FAILURE, "Unable to find root of source tree");
286 if ((pwd = getenv("PWD")) != NULL && *pwd == '/' &&
287 (pwd = strdup(pwd)) != NULL) {
288 /* Remove the last two path components. */
289 for (i = 0; i < 2; i++) {
290 if ((p = strrchr(pwd, '/')) == NULL) {
291 free(pwd);
292 return;
293 }
294 *p = '\0';
295 }
296 if (stat(pwd, &lg) != -1 && stat(srcdir, &phy) != -1 &&
297 lg.st_dev == phy.st_dev && lg.st_ino == phy.st_ino)
298 strlcpy(srcdir, pwd, MAXPATHLEN);
299 free(pwd);
300 }
301 }
302
303 static void
usage(void)304 usage(void)
305 {
306
307 fprintf(stderr,
308 "usage: config [-CgmpV] [-d destdir] [-s srcdir] sysname\n");
309 fprintf(stderr, " config -x kernel\n");
310 exit(EX_USAGE);
311 }
312
313 static void
init_line_buf(void)314 init_line_buf(void)
315 {
316
317 line_buf.str("");
318 }
319
320 static std::string
get_line_buf(void)321 get_line_buf(void)
322 {
323
324 line_buf.flush();
325 if (!line_buf.good()) {
326 errx(EXIT_FAILURE, "failed to generate line buffer, "
327 "partial line = %s", line_buf.str().c_str());
328 }
329
330 return line_buf.str();
331 }
332
333 /*
334 * get_word
335 * returns EOF on end of file
336 * NULL on end of line
337 * pointer to the word otherwise
338 */
339 configword
get_word(FILE * fp)340 get_word(FILE *fp)
341 {
342 int ch;
343 int escaped_nl = 0;
344
345 init_line_buf();
346 begin:
347 while ((ch = getc(fp)) != EOF)
348 if (ch != ' ' && ch != '\t')
349 break;
350 if (ch == EOF)
351 return (configword().eof(true));
352 if (ch == '\\'){
353 escaped_nl = 1;
354 goto begin;
355 }
356 if (ch == '\n') {
357 if (escaped_nl){
358 escaped_nl = 0;
359 goto begin;
360 }
361 else
362 return (configword().eol(true));
363 }
364 line_buf << (char)ch;
365 /* Negation operator is a word by itself. */
366 if (ch == '!') {
367 return (configword(get_line_buf()));
368 }
369 while ((ch = getc(fp)) != EOF) {
370 if (isspace(ch))
371 break;
372 line_buf << (char)ch;
373 }
374 if (ch == EOF)
375 return (configword().eof(true));
376 (void) ungetc(ch, fp);
377 return (configword(get_line_buf()));
378 }
379
380 /*
381 * get_quoted_word
382 * like get_word but will accept something in double or single quotes
383 * (to allow embedded spaces).
384 */
385 configword
get_quoted_word(FILE * fp)386 get_quoted_word(FILE *fp)
387 {
388 int ch;
389 int escaped_nl = 0;
390
391 init_line_buf();
392 begin:
393 while ((ch = getc(fp)) != EOF)
394 if (ch != ' ' && ch != '\t')
395 break;
396 if (ch == EOF)
397 return (configword().eof(true));
398 if (ch == '\\'){
399 escaped_nl = 1;
400 goto begin;
401 }
402 if (ch == '\n') {
403 if (escaped_nl){
404 escaped_nl = 0;
405 goto begin;
406 }
407 else
408 return (configword().eol(true));
409 }
410 if (ch == '"' || ch == '\'') {
411 int quote = ch;
412
413 escaped_nl = 0;
414 while ((ch = getc(fp)) != EOF) {
415 if (ch == quote && !escaped_nl)
416 break;
417 if (ch == '\n' && !escaped_nl) {
418 printf("config: missing quote reading `%s'\n",
419 get_line_buf().c_str());
420 exit(2);
421 }
422 if (ch == '\\' && !escaped_nl) {
423 escaped_nl = 1;
424 continue;
425 }
426 if (ch != quote && escaped_nl)
427 line_buf << "\\";
428 line_buf << (char)ch;
429 escaped_nl = 0;
430 }
431 } else {
432 line_buf << (char)ch;
433 while ((ch = getc(fp)) != EOF) {
434 if (isspace(ch))
435 break;
436 line_buf << (char)ch;
437 }
438 if (ch != EOF)
439 (void) ungetc(ch, fp);
440 }
441 if (ch == EOF)
442 return (configword().eof(true));
443 return (configword(get_line_buf()));
444 }
445
446 /*
447 * prepend the path to a filename
448 */
449 char *
path(const char * file)450 path(const char *file)
451 {
452 char *cp = NULL;
453
454 if (file)
455 asprintf(&cp, "%s/%s", destdir, file);
456 else
457 cp = strdup(destdir);
458 if (cp == NULL)
459 err(EXIT_FAILURE, "malloc");
460 return (cp);
461 }
462
463 /*
464 * Generate configuration file based on actual settings. With this mode, user
465 * will be able to obtain and build conifguration file with one command.
466 */
467 static void
configfile_dynamic(std::ostringstream & cfg)468 configfile_dynamic(std::ostringstream &cfg)
469 {
470 struct cputype *cput;
471 struct device *d;
472 struct opt *ol;
473 char *lend;
474 unsigned int i;
475
476 asprintf(&lend, "\\n\\\n");
477 assert(lend != NULL);
478 cfg << "options\t" << OPT_AUTOGEN << lend;
479 cfg << "ident\t" << ident << lend;
480 cfg << "machine\t" << machinename << lend;
481 SLIST_FOREACH(cput, &cputype, cpu_next)
482 cfg << "cpu\t" << cput->cpu_name << lend;
483 SLIST_FOREACH(ol, &mkopt, op_next)
484 cfg << "makeoptions\t" << ol->op_name << '=' <<
485 ol->op_value << lend;
486 SLIST_FOREACH(ol, &opt, op_next) {
487 if (strncmp(ol->op_name, "DEV_", 4) == 0)
488 continue;
489 cfg << "options\t" << ol->op_name;
490 if (ol->op_value != NULL) {
491 cfg << '=';
492 for (i = 0; i < strlen(ol->op_value); i++) {
493 if (ol->op_value[i] == '"')
494 cfg << '\\' << ol->op_value[i];
495 else
496 cfg << ol->op_value[i];
497 }
498 }
499
500 cfg << lend;
501 }
502 /*
503 * Mark this file as containing everything we need.
504 */
505 STAILQ_FOREACH(d, &dtab, d_next)
506 cfg << "device\t" << d->d_name << lend;
507 free(lend);
508 }
509
510 /*
511 * Generate file from the configuration files.
512 */
513 static void
configfile_filebased(std::ostringstream & cfg)514 configfile_filebased(std::ostringstream &cfg)
515 {
516 FILE *cff;
517 struct cfgfile *cf;
518 int i;
519
520 /*
521 * Try to read all configuration files. Since those will be present as
522 * C string in the macro, we have to slash their ends then the line
523 * wraps.
524 */
525 STAILQ_FOREACH(cf, &cfgfiles, cfg_next) {
526 cff = fopen(cf->cfg_path, "r");
527 if (cff == NULL) {
528 warn("Couldn't open file %s", cf->cfg_path);
529 continue;
530 }
531 while ((i = getc(cff)) != EOF) {
532 if (i == '\n')
533 cfg << "\\n\\\n";
534 else if (i == '"' || i == '\'')
535 cfg << '\\' << i;
536 else
537 cfg << i;
538 }
539 fclose(cff);
540 }
541 }
542
543 static void
configfile(void)544 configfile(void)
545 {
546 FILE *fo;
547 std::ostringstream cfg;
548 char *p;
549
550 /* Add main configuration file to the list of files to be included */
551 cfgfile_add(PREFIX);
552 p = path("config.c.new");
553 fo = fopen(p, "w");
554 if (!fo)
555 err(2, "%s", p);
556 free(p);
557
558 if (filebased) {
559 /* Is needed, can be used for backward compatibility. */
560 configfile_filebased(cfg);
561 } else {
562 configfile_dynamic(cfg);
563 }
564
565 cfg.flush();
566 /*
567 * We print first part of the template, replace our tag with
568 * configuration files content and later continue writing our
569 * template.
570 */
571 p = strstr(kernconfstr, KERNCONFTAG);
572 if (p == NULL)
573 errx(EXIT_FAILURE, "Something went terribly wrong!");
574 *p = '\0';
575 fprintf(fo, "%s", kernconfstr);
576 fprintf(fo, "%s", cfg.str().c_str());
577 p += strlen(KERNCONFTAG);
578 fprintf(fo, "%s", p);
579 fclose(fo);
580 moveifchanged("config.c.new", "config.c");
581 cfgfile_removeall();
582 }
583
584 /*
585 * moveifchanged --
586 * compare two files; rename if changed.
587 */
588 void
moveifchanged(const char * from_name,const char * to_name)589 moveifchanged(const char *from_name, const char *to_name)
590 {
591 char *p, *q;
592 char *from_path, *to_path;
593 int changed;
594 size_t tsize;
595 struct stat from_sb, to_sb;
596 int from_fd, to_fd;
597
598 changed = 0;
599
600 from_path = path(from_name);
601 to_path = path(to_name);
602 if ((from_fd = open(from_path, O_RDONLY)) < 0)
603 err(EX_OSERR, "moveifchanged open(%s)", from_name);
604
605 if ((to_fd = open(to_path, O_RDONLY)) < 0)
606 changed++;
607
608 if (!changed && fstat(from_fd, &from_sb) < 0)
609 err(EX_OSERR, "moveifchanged fstat(%s)", from_path);
610
611 if (!changed && fstat(to_fd, &to_sb) < 0)
612 err(EX_OSERR, "moveifchanged fstat(%s)", to_path);
613
614 if (!changed && from_sb.st_size != to_sb.st_size)
615 changed++;
616
617 if (!changed) {
618 tsize = (size_t)from_sb.st_size;
619
620 p = (char *)mmap(NULL, tsize, PROT_READ, MAP_SHARED, from_fd,
621 (off_t)0);
622 if (p == MAP_FAILED)
623 err(EX_OSERR, "mmap %s", from_path);
624 q = (char *)mmap(NULL, tsize, PROT_READ, MAP_SHARED, to_fd,
625 (off_t)0);
626 if (q == MAP_FAILED)
627 err(EX_OSERR, "mmap %s", to_path);
628
629 changed = memcmp(p, q, tsize);
630 munmap(p, tsize);
631 munmap(q, tsize);
632 }
633
634 if (changed) {
635 if (rename(from_path, to_path) < 0)
636 err(EX_OSERR, "rename(%s, %s)", from_path, to_path);
637 } else {
638 if (unlink(from_path) < 0)
639 err(EX_OSERR, "unlink(%s)", from_path);
640 }
641
642 close(from_fd);
643 if (to_fd >= 0)
644 close(to_fd);
645
646 free(from_path);
647 free(to_path);
648 }
649
650 static void
cleanheaders(char * p)651 cleanheaders(char *p)
652 {
653 DIR *dirp;
654 struct dirent *dp;
655 struct file_list *fl;
656 struct hdr_list *hl;
657 size_t len;
658
659 remember("y.tab.h");
660 remember("setdefs.h");
661 STAILQ_FOREACH(fl, &ftab, f_next)
662 remember(fl->f_fn);
663
664 /*
665 * Scan the build directory and clean out stuff that looks like
666 * it might have been a leftover NFOO header, etc.
667 */
668 if ((dirp = opendir(p)) == NULL)
669 err(EX_OSERR, "opendir %s", p);
670 while ((dp = readdir(dirp)) != NULL) {
671 len = strlen(dp->d_name);
672 /* Skip non-headers */
673 if (len < 2 || dp->d_name[len - 2] != '.' ||
674 dp->d_name[len - 1] != 'h')
675 continue;
676 /* Skip special stuff, eg: bus_if.h, but check opt_*.h */
677 if (strchr(dp->d_name, '_') &&
678 strncmp(dp->d_name, "opt_", 4) != 0)
679 continue;
680 /* Check if it is a target file */
681 for (hl = htab; hl != NULL; hl = hl->h_next) {
682 if (eq(dp->d_name, hl->h_name)) {
683 break;
684 }
685 }
686 if (hl)
687 continue;
688 printf("Removing stale header: %s\n", dp->d_name);
689 p = path(dp->d_name);
690 if (unlink(p) == -1)
691 warn("unlink %s", dp->d_name);
692 free(p);
693 }
694 (void)closedir(dirp);
695 }
696
697 void
remember(const char * file)698 remember(const char *file)
699 {
700 const char *s;
701 struct hdr_list *hl;
702
703 if ((s = strrchr(file, '/')) != NULL)
704 s = ns(s + 1);
705 else
706 s = ns(file);
707
708 if (strchr(s, '_') && strncmp(s, "opt_", 4) != 0) {
709 free(__DECONST(char *, s));
710 return;
711 }
712 for (hl = htab; hl != NULL; hl = hl->h_next) {
713 if (eq(s, hl->h_name)) {
714 free(__DECONST(char *, s));
715 return;
716 }
717 }
718 hl = (struct hdr_list *)calloc(1, sizeof(*hl));
719 if (hl == NULL)
720 err(EXIT_FAILURE, "calloc");
721 hl->h_name = s;
722 hl->h_next = htab;
723 htab = hl;
724 }
725
726 /*
727 * This one is quick hack. Will be probably moved to elf(3) interface.
728 * It takes kernel configuration file name, passes it as an argument to
729 * elfdump -a, which output is parsed by some UNIX tools...
730 */
731 static void
kernconfdump(const char * file)732 kernconfdump(const char *file)
733 {
734 struct stat st;
735 FILE *fp, *pp;
736 int error, osz, r;
737 size_t i, off, size, t1, t2, align;
738 char *cmd, *o;
739
740 r = open(file, O_RDONLY);
741 if (r == -1)
742 err(EXIT_FAILURE, "Couldn't open file '%s'", file);
743 error = fstat(r, &st);
744 if (error == -1)
745 err(EXIT_FAILURE, "fstat() failed");
746 if (S_ISDIR(st.st_mode))
747 errx(EXIT_FAILURE, "'%s' is a directory", file);
748 fp = fdopen(r, "r");
749 if (fp == NULL)
750 err(EXIT_FAILURE, "fdopen() failed");
751 osz = 1024;
752 o = (char *)calloc(1, osz);
753 if (o == NULL)
754 err(EXIT_FAILURE, "Couldn't allocate memory");
755 /* ELF note section header. */
756 asprintf(&cmd, "/usr/bin/elfdump -c %s | grep -A 8 kern_conf"
757 "| tail -5 | cut -d ' ' -f 2 | paste - - - - -", file);
758 if (cmd == NULL)
759 errx(EXIT_FAILURE, "asprintf() failed");
760 pp = popen(cmd, "r");
761 if (pp == NULL)
762 errx(EXIT_FAILURE, "popen() failed");
763 free(cmd);
764 (void)fread(o, osz, 1, pp);
765 pclose(pp);
766 r = sscanf(o, "%zu%zu%zu%zu%zu", &off, &size, &t1, &t2, &align);
767 free(o);
768 if (size > SIZE_MAX - off || off + size > (size_t)st.st_size)
769 errx(EXIT_FAILURE, "%s: incoherent ELF headers", file);
770 if (r != 5)
771 errx(EXIT_FAILURE, "File %s doesn't contain configuration "
772 "file. Either unsupported, or not compiled with "
773 "INCLUDE_CONFIG_FILE", file);
774 r = fseek(fp, off, SEEK_CUR);
775 if (r != 0)
776 err(EXIT_FAILURE, "fseek() failed");
777 for (i = 0; i < size; i++) {
778 r = fgetc(fp);
779 if (r == EOF)
780 break;
781 if (r == '\0') {
782 assert(i == size - 1 &&
783 ("\\0 found in the middle of a file"));
784 break;
785 }
786 fputc(r, stdout);
787 }
788 fclose(fp);
789 }
790
791 static void
badversion(void)792 badversion(void)
793 {
794 fprintf(stderr, "ERROR: version of config(8) does not match kernel!\n");
795 fprintf(stderr, "config version = %d, ", CONFIGVERS);
796 fprintf(stderr, "version required = %d\n\n", versreq);
797 fprintf(stderr, "Make sure that /usr/src/usr.sbin/config is in sync\n");
798 fprintf(stderr, "with your /usr/src/sys and install a new config binary\n");
799 fprintf(stderr, "before trying this again.\n\n");
800 fprintf(stderr, "If running the new config fails check your config\n");
801 fprintf(stderr, "file against the GENERIC or LINT config files for\n");
802 fprintf(stderr, "changes in config syntax, or option/device naming\n");
803 fprintf(stderr, "conventions\n\n");
804 exit(1);
805 }
806
807 static void
checkversion(void)808 checkversion(void)
809 {
810 FILE *ifp;
811 char line[BUFSIZ];
812
813 ifp = open_makefile_template();
814 while (fgets(line, BUFSIZ, ifp) != 0) {
815 if (*line != '%')
816 continue;
817 if (strncmp(line, "%VERSREQ=", 9) != 0)
818 continue;
819 versreq = atoi(line + 9);
820 if (MAJOR_VERS(versreq) == MAJOR_VERS(CONFIGVERS) &&
821 versreq <= CONFIGVERS)
822 continue;
823 badversion();
824 }
825 fclose(ifp);
826 }
827