239 lines
6.3 KiB
Plaintext
239 lines
6.3 KiB
Plaintext
%{
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* 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, Lawrence Berkeley Laboratories.
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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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* @(#)scan.l 8.1 (Berkeley) 6/6/93
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*/
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#include <sys/param.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "config.h"
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#include "y.tab.h"
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int yyline;
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const char *yyfile;
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const char *lastfile;
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int include __P((const char *, int));
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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_preveof; /* previous eoftoken */
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};
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static struct incl *incl;
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static int eoftoken; /* current EOF token */
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static void endinclude __P((void));
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#define yywrap() 1
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%}
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PATH [-/A-Za-z0-9_.]*[./][-/A-Za-z0-9_.]*
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WORD [A-Za-z_][-A-Za-z_0-9]*
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%%
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/* plain keywords */
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and { return AND; }
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at { return AT; }
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compile-with { return COMPILE_WITH; }
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config { return CONFIG; }
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define { return DEFINE; }
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device { return DEVICE; }
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dumps { return DUMPS; }
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flags { return FLAGS; }
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file { return XFILE; }
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include { return INCLUDE; }
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machine { return XMACHINE; }
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major { return MAJOR; }
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makeoptions { return MAKEOPTIONS; }
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maxusers { return MAXUSERS; }
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minor { return MINOR; }
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on { return ON; }
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options { return OPTIONS; }
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"pseudo-device" { return PSEUDO_DEVICE; }
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root { return ROOT; }
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swap { return SWAP; }
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vector { return VECTOR; }
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/* keywords with values */
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config-dependent { yylval.val = FI_CONFIGDEP; return FFLAG; }
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device-driver { yylval.val = FI_DRIVER; return FFLAG; }
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needs-count { yylval.val = FI_NEEDSCOUNT; return FFLAG; }
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needs-flag { yylval.val = FI_NEEDSFLAG; return FFLAG; }
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/* all the rest */
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{PATH} { yylval.str = intern(yytext); return PATHNAME; }
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{WORD} { yylval.str = intern(yytext); return WORD; }
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\"[^"]+/\" {
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yylval.str = intern(yytext + 1);
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(void)input(); /* eat closing quote */
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return WORD;
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}
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0[0-7]* {
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yylval.val = strtol(yytext, NULL, 8);
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return NUMBER;
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}
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0[xX][0-9a-fA-F]+ {
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yylval.val = strtol(yytext + 2, NULL, 16);
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return NUMBER;
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}
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[1-9][0-9]* {
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yylval.val = strtol(yytext, NULL, 10);
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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 '\n';
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}
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#.* { /* ignored (comment) */; }
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[ \t]* { /* ignored (white space) */; }
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. { return yytext[0]; }
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<<EOF>> {
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int tok;
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tok = eoftoken;
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eoftoken = YY_NULL;
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if (incl != NULL)
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endinclude();
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return (tok);
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}
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%%
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/*
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* Open the "main" file (conffile).
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*/
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int
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firstfile(fname)
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const char *fname;
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{
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if ((yyin = fopen(fname, "r")) == NULL)
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return (-1);
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yyfile = conffile = fname;
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yyline = 1;
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eoftoken = YY_NULL;
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return (0);
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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 returned at the end of the include file (typically '\n'
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* or ENDFILE).
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*/
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int
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include(fname, ateof)
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const char *fname;
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int ateof;
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{
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register FILE *fp;
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register struct incl *in;
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if ((fp = fopen(fname, "r")) == NULL) {
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error("cannot open %s for reading: %s\n",
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fname, strerror(errno));
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return (-1);
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}
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in = emalloc(sizeof *in);
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in->in_prev = incl;
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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_preveof = eoftoken;
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incl = in;
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yy_switch_to_buffer(yy_create_buffer(fp, YY_BUF_SIZE));
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yyfile = intern(fname);
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yyline = 1;
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eoftoken = ateof;
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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 void
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endinclude()
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{
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register struct incl *in;
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if ((in = incl) == NULL)
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panic("endinclude");
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incl = 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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eoftoken = in->in_preveof;
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free(in);
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}
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/*
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* Return the current line number. If yacc has looked ahead and caused
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* us to consume a newline, we have to subtract one. yychar is yacc's
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* token lookahead, so we can tell.
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*/
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int
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currentline()
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{
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extern int yychar;
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return (yyline - (yychar == '\n'));
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}
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