FreeBSD-5.3/usr.sbin/config/lang.l
%{
/*-
* 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: src/usr.sbin/config/lang.l,v 1.37 2004/08/07 04:19:37 imp Exp $
*/
#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 },
{ "device", DEVICE },
{ "nodevice", NODEVICE },
{ "env", ENV },
{ "hints", HINTS },
{ "ident", IDENT },
{ "machine", ARCH }, /* MACHINE is defined in /sys/param.h */
{ "makeoptions", MAKEOPTIONS },
{ "nomakeoption", NOMAKEOPTION },
{ "maxusers", MAXUSERS },
{ "profile", PROFILE },
{ "option", OPTIONS },
{ "options", OPTIONS },
{ "nooption", 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 *);
%}
WORD [A-Za-z_][-A-Za-z_]*
ID [A-Za-z_][-A-Za-z_0-9]*
%START NONUM TOEOL
%%
<NONUM>{WORD} {
int i;
BEGIN 0;
if ((i = kw_lookup(yytext)) == -1)
{
yylval.str = strdup(yytext);
return ID;
}
return i;
}
<INITIAL>{WORD}/[0-9]* {
int i;
if ((i = kw_lookup(yytext)) == -1)
REJECT;
if (i == DEVICE || i == NODEVICE)
BEGIN NONUM;
return i;
}
<INITIAL>{ID} {
BEGIN 0;
yylval.str = strdup(yytext);
return ID;
}
\\\"[^"]+\\\" {
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;
}
/*
* 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;
fp = fopen(fname, "r");
if (fp == NULL) {
yyerror("cannot open file");
return (-1);
}
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);
}