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