freebsd-dev/usr.sbin/config/lang.l
Wojciech A. Koszek 744b947ef8 Improve INCLUDE_CONFIG_FILE support.
This change will let us to have full configuration of a running kernel
available in sysctl:

	sysctl -b kern.conftxt

The same configuration is also contained within the kernel image. It can be
obtained with:

	config -x <kernelfile>

Current functionality lets you to quickly recover kernel configuration, by
simply redirecting output from commands presented above and starting kernel
build procedure. "include" statements are also honored, which means options
and devices from included files are also included.

Please note that comments from configuration files are not preserved by
default. In order to preserve them, you can use -C flag for config(8). This
will bring configuration file and included files literally; however,
redirection to a file no longer works directly.

This commit was followed by discussion, that took place on freebsd-current@.
For more details, look here:

	http://lists.freebsd.org/pipermail/freebsd-current/2007-March/069994.html
	http://lists.freebsd.org/pipermail/freebsd-current/2007-May/071844.html

Development of this patch took place in Perforce, hierarchy:

	//depot/user/wkoszek/wkoszek_kconftxt/

Support from:	freebsd-current@ (links above)
Reviewed by:	imp@
Approved by:	imp@
2007-05-12 19:38:18 +00:00

300 lines
6.5 KiB
Plaintext

%{
/*-
* 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.
* 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.
*
* @(#)lang.l 8.1 (Berkeley) 6/6/93
* $FreeBSD$
*/
#include <assert.h>
#include <ctype.h>
#include <string.h>
#include "y.tab.h"
#include "config.h"
#define YY_NO_UNPUT
/*
* Data for returning to previous files from include files.
*/
struct incl {
struct incl *in_prev; /* previous includes in effect, if any */
YY_BUFFER_STATE in_buf; /* previous lex state */
const char *in_fname; /* previous file name */
int in_lineno; /* previous line number */
int in_ateof; /* token to insert at EOF */
};
static struct incl *inclp;
static const char *lastfile;
/*
* Key word table
*/
struct kt {
const char *kt_name;
int kt_val;
} key_words[] = {
{ "config", CONFIG },
{ "cpu", CPU },
{ "nocpu", NOCPU },
{ "device", DEVICE },
{ "devices", DEVICE },
{ "nodevice", NODEVICE },
{ "nodevices", NODEVICE },
{ "env", ENV },
{ "hints", HINTS },
{ "ident", IDENT },
{ "machine", ARCH }, /* MACHINE is defined in /sys/param.h */
{ "makeoption", MAKEOPTIONS },
{ "makeoptions", MAKEOPTIONS },
{ "nomakeoption", NOMAKEOPTION },
{ "nomakeoptions", NOMAKEOPTION },
{ "maxusers", MAXUSERS },
{ "profile", PROFILE },
{ "option", OPTIONS },
{ "options", OPTIONS },
{ "nooption", NOOPTION },
{ "nooptions", NOOPTION },
{ "include", INCLUDE },
{ "files", FILES },
{ 0, 0 },
};
static int endinclude(void);
int include(const char *, int);
int kw_lookup(char *);
unsigned int octal(const char *);
unsigned int hex(const char *);
int yyerror(const char *);
%}
ID [A-Za-z_][-A-Za-z_0-9]*
%START TOEOL
%%
{ID} {
int i;
BEGIN 0;
if ((i = kw_lookup(yytext)) == -1)
{
yylval.str = strdup(yytext);
return ID;
}
return i;
}
\\\"[^"]+\\\" {
BEGIN 0;
yytext[yyleng-2] = '"';
yytext[yyleng-1] = '\0';
yylval.str = strdup(yytext + 1);
return ID;
}
\"[^"]+\" {
BEGIN 0;
yytext[yyleng-1] = '\0';
yylval.str = strdup(yytext + 1);
return ID;
}
<TOEOL>[^# \t\n]* {
BEGIN 0;
yylval.str = strdup(yytext);
return ID;
}
0[0-7]* {
yylval.val = octal(yytext);
return NUMBER;
}
0x[0-9a-fA-F]+ {
yylval.val = hex(yytext);
return NUMBER;
}
-?[1-9][0-9]* {
yylval.val = atoi(yytext);
return NUMBER;
}
"?" {
yylval.val = -1;
return NUMBER;
}
\n/[ \t] {
yyline++;
}
\n {
yyline++;
return SEMICOLON;
}
#.* { /* Ignored (comment) */; }
[ \t\f]* { /* Ignored (white space) */; }
";" { return SEMICOLON; }
"," { return COMMA; }
"=" { BEGIN TOEOL; return EQUALS; }
<<EOF>> {
int tok;
if (inclp == NULL)
return YY_NULL;
tok = endinclude();
if (tok != 0)
return tok;
/* otherwise continue scanning */
}
. { return yytext[0]; }
%%
/*
* kw_lookup
* Look up a string in the keyword table. Returns a -1 if the
* string is not a keyword otherwise it returns the keyword number
*/
int
kw_lookup(char *word)
{
struct kt *kp;
for (kp = key_words; kp->kt_name != 0; kp++)
if (eq(word, kp->kt_name))
return kp->kt_val;
return -1;
}
/*
* Number conversion routines
*/
unsigned int
octal(const char *str)
{
unsigned int num;
(void) sscanf(str, "%o", &num);
return num;
}
unsigned int
hex(const char *str)
{
unsigned int num;
(void) sscanf(str+2, "%x", &num);
return num;
}
void
cfgfile_add(const char *fname)
{
struct cfgfile *cf;
cf = calloc(1, sizeof(*cf));
assert(cf != NULL);
asprintf(&cf->cfg_path, "%s", fname);
STAILQ_INSERT_TAIL(&cfgfiles, cf, cfg_next);
}
void
cfgfile_removeall(void)
{
struct cfgfile *cf;
while (!STAILQ_EMPTY(&cfgfiles)) {
cf = STAILQ_FIRST(&cfgfiles);
STAILQ_REMOVE_HEAD(&cfgfiles, cfg_next);
if (cf->cfg_path != NULL)
free(cf->cfg_path);
free(cf);
}
}
/*
* Open the named file for inclusion at the current point. Returns 0 on
* success (file opened and previous state pushed), nonzero on failure
* (fopen failed, complaint made). The `ateof' parameter controls the
* token to be inserted at the end of the include file. If ateof == 0,
* then nothing is inserted.
*/
int
include(const char *fname, int ateof)
{
FILE *fp;
struct incl *in;
char *fnamebuf;
fnamebuf = NULL;
fp = fopen(fname, "r");
if (fp == NULL && fname[0] != '.' && fname[0] != '/') {
asprintf(&fnamebuf, "../../conf/%s", fname);
if (fnamebuf != NULL) {
fp = fopen(fnamebuf, "r");
free(fnamebuf);
}
}
if (fp == NULL) {
yyerror("cannot open included file");
return (-1);
}
cfgfile_add(fnamebuf == NULL ? fname : fnamebuf);
in = malloc(sizeof(*in));
assert(in != NULL);
in->in_prev = inclp;
in->in_buf = YY_CURRENT_BUFFER;
in->in_fname = yyfile;
in->in_lineno = yyline;
in->in_ateof = ateof;
inclp = in;
yy_switch_to_buffer(yy_create_buffer(fp, YY_BUF_SIZE));
yyfile = fname;
yyline = 0;
return (0);
}
/*
* Terminate the most recent inclusion.
*/
static int
endinclude()
{
struct incl *in;
int ateof;
in = inclp;
assert(in != NULL);
inclp = in->in_prev;
lastfile = yyfile;
yy_delete_buffer(YY_CURRENT_BUFFER);
(void)fclose(yyin);
yy_switch_to_buffer(in->in_buf);
yyfile = in->in_fname;
yyline = in->in_lineno;
ateof = in->in_ateof;
free(in);
return (ateof);
}