279 lines
6.2 KiB
Plaintext
279 lines
6.2 KiB
Plaintext
%{
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/*-
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* Copyright (c) 1980, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)lang.l 8.1 (Berkeley) 6/6/93
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* $FreeBSD$
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*/
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#include <assert.h>
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#include <ctype.h>
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#include <string.h>
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#include "y.tab.h"
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#include "config.h"
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#define YY_NO_UNPUT
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/*
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* Data for returning to previous files from include files.
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*/
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struct incl {
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struct incl *in_prev; /* previous includes in effect, if any */
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YY_BUFFER_STATE in_buf; /* previous lex state */
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const char *in_fname; /* previous file name */
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int in_lineno; /* previous line number */
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int in_ateof; /* token to insert at EOF */
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};
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static struct incl *inclp;
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static const char *lastfile;
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/*
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* Key word table
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*/
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struct kt {
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const char *kt_name;
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int kt_val;
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} key_words[] = {
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{ "config", CONFIG },
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{ "cpu", CPU },
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{ "device", DEVICE },
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{ "nodevice", NODEVICE },
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{ "env", ENV },
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{ "hints", HINTS },
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{ "ident", IDENT },
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{ "machine", ARCH }, /* MACHINE is defined in /sys/param.h */
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{ "makeoptions", MAKEOPTIONS },
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{ "nomakeoption", NOMAKEOPTION },
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{ "maxusers", MAXUSERS },
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{ "profile", PROFILE },
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{ "option", OPTIONS },
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{ "options", OPTIONS },
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{ "nooption", NOOPTION },
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{ "include", INCLUDE },
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{ "files", FILES },
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{ 0, 0 },
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};
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static int endinclude(void);
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int include(const char *, int);
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int kw_lookup(char *);
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unsigned int octal(const char *);
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unsigned int hex(const char *);
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int yyerror(const char *);
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%}
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WORD [A-Za-z_][-A-Za-z_]*
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ID [A-Za-z_][-A-Za-z_0-9]*
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%START NONUM TOEOL
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%%
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<NONUM>{WORD} {
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int i;
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BEGIN 0;
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if ((i = kw_lookup(yytext)) == -1)
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{
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yylval.str = strdup(yytext);
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return ID;
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}
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return i;
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}
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<INITIAL>{WORD}/[0-9]* {
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int i;
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if ((i = kw_lookup(yytext)) == -1)
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REJECT;
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if (i == DEVICE || i == NODEVICE)
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BEGIN NONUM;
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return i;
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}
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<INITIAL>{ID} {
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BEGIN 0;
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yylval.str = strdup(yytext);
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return ID;
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}
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\\\"[^"]+\\\" {
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BEGIN 0;
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yytext[yyleng-2] = '"';
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yytext[yyleng-1] = '\0';
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yylval.str = strdup(yytext + 1);
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return ID;
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}
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\"[^"]+\" {
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BEGIN 0;
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yytext[yyleng-1] = '\0';
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yylval.str = strdup(yytext + 1);
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return ID;
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}
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<TOEOL>[^# \t\n]* {
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BEGIN 0;
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yylval.str = strdup(yytext);
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return ID;
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}
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0[0-7]* {
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yylval.val = octal(yytext);
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return NUMBER;
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}
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0x[0-9a-fA-F]+ {
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yylval.val = hex(yytext);
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return NUMBER;
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}
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-?[1-9][0-9]* {
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yylval.val = atoi(yytext);
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return NUMBER;
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}
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"?" {
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yylval.val = -1;
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return NUMBER;
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}
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\n/[ \t] {
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yyline++;
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}
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\n {
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yyline++;
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return SEMICOLON;
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}
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#.* { /* Ignored (comment) */; }
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[ \t\f]* { /* Ignored (white space) */; }
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";" { return SEMICOLON; }
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"," { return COMMA; }
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"=" { BEGIN TOEOL; return EQUALS; }
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<<EOF>> {
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int tok;
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if (inclp == NULL)
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return YY_NULL;
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tok = endinclude();
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if (tok != 0)
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return tok;
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/* otherwise continue scanning */
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}
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. { return yytext[0]; }
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%%
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/*
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* kw_lookup
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* Look up a string in the keyword table. Returns a -1 if the
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* string is not a keyword otherwise it returns the keyword number
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*/
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int
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kw_lookup(char *word)
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{
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struct kt *kp;
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for (kp = key_words; kp->kt_name != 0; kp++)
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if (eq(word, kp->kt_name))
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return kp->kt_val;
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return -1;
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}
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/*
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* Number conversion routines
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*/
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unsigned int
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octal(const char *str)
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{
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unsigned int num;
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(void) sscanf(str, "%o", &num);
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return num;
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}
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unsigned int
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hex(const char *str)
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{
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unsigned int num;
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(void) sscanf(str+2, "%x", &num);
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return num;
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}
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/*
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* Open the named file for inclusion at the current point. Returns 0 on
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* success (file opened and previous state pushed), nonzero on failure
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* (fopen failed, complaint made). The `ateof' parameter controls the
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* token to be inserted at the end of the include file. If ateof == 0,
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* then nothing is inserted.
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*/
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int
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include(const char *fname, int ateof)
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{
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FILE *fp;
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struct incl *in;
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fp = fopen(fname, "r");
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if (fp == NULL) {
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yyerror("cannot open file");
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return (-1);
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}
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in = malloc(sizeof(*in));
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assert(in != NULL);
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in->in_prev = inclp;
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in->in_buf = YY_CURRENT_BUFFER;
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in->in_fname = yyfile;
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in->in_lineno = yyline;
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in->in_ateof = ateof;
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inclp = in;
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yy_switch_to_buffer(yy_create_buffer(fp, YY_BUF_SIZE));
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yyfile = fname;
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yyline = 0;
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return (0);
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}
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/*
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* Terminate the most recent inclusion.
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*/
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static int
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endinclude()
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{
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struct incl *in;
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int ateof;
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in = inclp;
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assert(in != NULL);
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inclp = in->in_prev;
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lastfile = yyfile;
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yy_delete_buffer(YY_CURRENT_BUFFER);
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(void)fclose(yyin);
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yy_switch_to_buffer(in->in_buf);
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yyfile = in->in_fname;
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yyline = in->in_lineno;
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ateof = in->in_ateof;
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free(in);
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return (ateof);
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}
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