Implement support for conf/options and i386/conf/options.i386

Note that this code is dormant unless the options files exist.
Also, parsing of quoted options in the config files is improved.

What this allows, is all the options in LINT to be specified to be
configured as #defines in a file rather than on the CC command line at
kernel build time.  This means that 'make depend' will catch dependencies
on actual *options*, meaning that you can run 'config' and 'make depend'
in complete safety WITHOUT removing the compile directory each time.

Unfortunately, this requires a pass over the source to get the individual
files to #include the new .h files that would be generated by config.
This has a small compile time penalty (appears up to about 2% slower)
from a "fresh" build.  Of course, you should not be needing to do complete
rebuilds very often once this was completed, so it would be an overall
win for most people.

Since this code is dormant and we've got a lot of other things happening
on the kernel tree at the moment (prototypes, devfs, static declarations
etc) I am not planning on doing any changes to activate this feature just
yet.

1 files changed, 316 insertions, 0 deletions

diff --git a/usr.sbin/config/mkoptions.c b/usr.sbin/config/mkoptions.c
new file mode 100644
index 000000000000..f722d9339923
--- /dev/null
+++ b/usr.sbin/config/mkoptions.c
@@ -0,0 +1,316 @@
+/*
+ * Copyright (c) 1995  Peter Wemm
+ * Copyright (c) 1980, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#)mkheaders.c	8.1 (Berkeley) 6/6/93";
+#endif /* not lint */
+
+/*
+ * Make all the .h files for the optional entries
+ */
+
+#include <stdio.h>
+#include <ctype.h>
+#include "config.h"
+#include "y.tab.h"
+
+options()
+{
+	struct opt_list *ol;
+
+	/* fake the cpu types as options */
+	/* Please forgive me for this hack.. :-) */
+	struct opt *op;
+	struct cputype *cp;
+
+	for (cp = cputype; cp; cp = cp->cpu_next) {
+		struct opt *op = (struct opt *)malloc(sizeof (struct opt));
+		memset(op, 0, sizeof(*op));
+		op->op_name = cp->cpu_name;
+		op->op_value = 0;
+		op->op_next = opt;
+		opt = op;
+	}	
+
+	read_options();
+	for (ol = otab; ol != 0; ol = ol->o_next)
+		do_option(ol->o_name);
+}
+
+/*
+ * Generate an <options>.h file
+ */
+
+do_option(name)
+	char *name;
+{
+	char *file, *inw, *tooption();
+	struct opt *op, *op_head, *topp;
+	FILE *inf, *outf;
+	char *value;
+	char *oldvalue;
+	int seen;
+
+	file = tooption(name);
+
+	/*
+	 * Check to see if the option was specified..
+	 */
+	value = NULL;
+	for (op = opt; op; op = op->op_next) {
+		if (eq(name, op->op_name)) {
+			value = op->op_value;
+			if (!value)
+				value = ns("1");
+			op->op_ownfile++;
+		}
+	}
+
+	inf = fopen(file, "r");
+	if (inf == 0) {
+		outf = fopen(file, "w");
+		if (outf == 0) {
+			perror(file);
+			exit(1);
+		}
+
+		/* was the option in the config file? */
+		if (value) {
+			fprintf(outf, "#define %s %s\n", name, value);
+		} /* else empty file */
+
+		(void) fclose(outf);
+		return;
+	}
+	oldvalue = NULL;
+	op_head = NULL;
+	seen = 0;
+	for (;;) {
+		char *cp;
+		char *invalue;
+
+		/* get the #define */
+		if ((inw = get_word(inf)) == 0 || inw == (char *)EOF)
+			break;
+		/* get the option name */
+		if ((inw = get_word(inf)) == 0 || inw == (char *)EOF)
+			break;
+		inw = ns(inw);
+		cp = get_word(inf);
+		if (cp == 0 || cp == (char *)EOF)
+			break;
+		/* option value */
+		invalue = ns(cp); /* malloced */
+		if (eq(inw, name)) {
+			oldvalue = invalue;
+			invalue = value;
+			seen++;
+		}
+		op = (struct opt *) malloc(sizeof *op);
+		bzero(op, sizeof(*op));
+		op->op_name = inw;
+		op->op_value = invalue;
+		op->op_next = op_head;
+		op_head = op;
+
+		/* EOL? */
+		cp = get_word(inf);
+		if (cp == (char *)EOF)
+			break;
+	}
+	(void) fclose(inf);
+	if ((value == NULL && oldvalue == NULL) ||
+	    (value && oldvalue && eq(value,oldvalue))) {	
+		for (op = op_head; op != NULL; op = topp) {
+			topp = op->op_next;
+			free(op->op_name);
+			free(op->op_value);
+			free(op);
+		}
+		return;
+	}
+
+	if (value && !seen) {
+		/* New option appears */
+		op = (struct opt *) malloc(sizeof *op);
+		bzero(op, sizeof(*op));
+		op->op_name = ns(name);
+		op->op_value = value ? ns(value) : NULL;
+		op->op_next = op_head;
+		op_head = op;
+	}
+
+	outf = fopen(file, "w");
+	if (outf == 0) {
+		perror(file);
+		exit(1);
+	}
+	for (op = op_head; op != NULL; op = topp) {
+		/* was the option in the config file? */
+		if (op->op_value) {
+			fprintf(outf, "#define %s %s\n",
+				op->op_name, op->op_value);
+		}
+		topp = op->op_next;
+		free(op->op_name);
+		free(op->op_value);
+		free(op);
+	}
+	(void) fclose(outf);
+}
+
+/*
+ * Find the filename to store the option spec into.
+ */
+char *
+tooption(name)
+	char *name;
+{
+	static char hbuf[80];
+	char nbuf[80];
+	struct opt_list *po;
+
+	/* "cannot happen"?  the otab list should be complete.. */
+	(void) strcpy(nbuf, "options.h");
+
+	for (po = otab ; po != 0; po = po->o_next) {
+		if (eq(po->o_name, name)) {
+			strcpy(nbuf, po->o_file);
+			break;
+		}
+	}
+
+	(void) strcpy(hbuf, path(nbuf));
+	return (hbuf);
+}
+
+/*
+ * read the options and options.<machine> files
+ */
+read_options()
+{
+	FILE *fp;
+	char fname[32];
+	char *wd, *this, *val;
+	struct opt_list *po;
+	int first = 1;
+	char genopt[80];
+	char *lower();
+
+	otab = 0;
+	(void) strcpy(fname, "../../conf/options");
+openit:
+	fp = fopen(fname, "r");
+	if (fp == 0) {
+		return;
+	}
+	if(ident == NULL) {
+		printf("no ident line specified\n");
+		exit(1);
+	}
+next:
+	wd = get_word(fp);
+	if (wd == (char *)EOF) {
+		(void) fclose(fp);
+		if (first == 1) {
+			(void) sprintf(fname, "options.%s", machinename);
+			first++;
+			goto openit;
+		}
+		if (first == 2) {
+			(void) sprintf(fname, "options.%s", raise(ident));
+			first++;
+			fp = fopen(fname, "r");
+			if (fp != 0)
+				goto next;
+		}
+		return;
+	}
+	if (wd == 0)
+		goto next;
+	/*************************************************\
+	* If it's a comment ignore to the end of the line *
+	\*************************************************/
+	if(wd[0] == '#')
+	{
+		while( ((wd = get_word(fp)) != (char *)EOF) && wd)
+		;
+		goto next;
+	}
+	this = ns(wd);
+	val = get_word(fp);
+	if (val == (char *)EOF)
+		return;
+	if (val == 0) {
+		char *s = ns(this);
+		(void) strcpy(genopt, "opt_");
+		(void) strcat(genopt, lower(s));
+		(void) strcat(genopt, ".h");
+		val = genopt;
+		free(s);
+	}
+	val = ns(val);
+
+	for (po = otab ; po != 0; po = po->o_next) {
+		if (eq(po->o_name, this)) {
+			printf("%s: Duplicate option %s.\n",
+			       fname, this);
+			exit(1);
+		}
+	}
+	
+	po = (struct opt_list *) malloc(sizeof *po);
+	bzero(po, sizeof(*po));
+	po->o_name = this;
+	po->o_file = val;
+	po->o_next = otab;
+	otab = po;
+
+	goto next;
+}
+
+char *
+lower(str)
+	register char *str;
+{
+	register char *cp = str;
+
+	while (*str) {
+		if (isupper(*str))
+			*str = tolower(*str);
+		str++;
+	}
+	return (cp);
+}
+