663 lines
15 KiB
Plaintext
663 lines
15 KiB
Plaintext
%{
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/* $NetBSD: scan.l,v 1.35 2024/01/18 04:41:37 thorpej Exp $ */
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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. 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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* from: @(#)scan.l 8.1 (Berkeley) 6/6/93
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: scan.l,v 1.35 2024/01/18 04:41:37 thorpej Exp $");
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#include <sys/param.h>
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#include <errno.h>
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#include <libgen.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 <stddef.h>
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#include <ctype.h>
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#include <util.h>
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#undef ECHO
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#include "defs.h"
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#include "gram.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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char curinclpath[PATH_MAX];
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uint64_t ifdefstate;
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int ifdefshift = -1;
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/*
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* The state is represented by 3 bits.
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*/
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#define IDS_ENABLED 1ll
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#define IDS_MATCH 2ll
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#define IDS_ELIF 4ll
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#define IDS_ELSE 8ll
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#define IDS_BITS 0xf
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#define IDS_SHIFT 4
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#define IDS_ISMATCH(st) (((st) & IDS_MATCH) != 0)
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#define IDS_ISENABLED(st) (((st) & IDS_ENABLED) != 0)
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#define IDS_PARENT_DISABLED \
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(ifdefshift > 0 && !IDS_ISENABLED(ifdefstate >> IDS_SHIFT))
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#define IDS_MAX_DEPTH 16 /* 64 / 4 */
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#ifdef IDS_DEBUG
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# define IDS_PRINT(s, st, x) \
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do { \
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for (int i = 0; i < ifdefshift + 1; i++) \
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fprintf(stderr, " "); \
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printf("%s%s [%d,%d,%d] %#" PRIx64 "\n", x, # s, \
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IDS_PARENT_DISABLED, IDS_ISMATCH(st), getcurifdef(), \
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ifdefstate); \
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} while (0)
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#else
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# define IDS_PRINT(s, st, x) ((void)0)
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#endif
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#define IDS_ENTER(s, st) \
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IDS_PRINT(s, st, ">")
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#define IDS_EXIT(s, st) \
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IDS_PRINT(s, st, "<")
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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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struct where in_where;
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int in_ateof; /* token to insert at EOF */
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int in_interesting; /* previous value for "interesting" */
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uint64_t in_ifdefstate; /* conditional level */
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int in_ifdefshift; /* conditional level */
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};
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static struct incl *incl;
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static int endinclude(void);
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static int getincludepath(void);
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static int getcurifdef(void);
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SLIST_HEAD(, prefix) curdirs; /* curdir stack */
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%}
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%option noyywrap nounput noinput
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PATH [A-Za-z_0-9]*[./][-A-Za-z_0-9./]*
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QCHARS \"(\\.|[^\\"])*\"
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WORD [A-Za-z_][-A-Za-z_0-9]*
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FILENAME ({PATH}|{QCHARS})
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RESTOFLINE [ \t]*(#[^\n]*)?\n
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WS ^[ \t]*
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%x IGNORED
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%%
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/* Local variables for yylex() */
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int tok;
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and return AND;
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at return AT;
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attach return ATTACH;
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block return BLOCK;
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build return BUILD;
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char return CHAR;
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compile-with return COMPILE_WITH;
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config return CONFIG;
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deffs return DEFFS;
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define return DEFINE;
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defflag return DEFFLAG;
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defopt return DEFOPT;
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defparam return DEFPARAM;
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defpseudo return DEFPSEUDO;
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defpseudodev return DEFPSEUDODEV;
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devclass return DEVCLASS;
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device return DEVICE;
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device-major return DEVICE_MAJOR;
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dumps return DUMPS;
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file return XFILE;
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file-system return FILE_SYSTEM;
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flags return FLAGS;
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ident return IDENT;
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ioconf return IOCONF;
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linkzero return LINKZERO;
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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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mkflagvar return MKFLAGVAR;
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maxpartitions return MAXPARTITIONS;
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maxusers return MAXUSERS;
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minor return MINOR;
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needs-count return NEEDS_COUNT;
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needs-flag return NEEDS_FLAG;
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no return NO;
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-no return CNO;
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object return XOBJECT;
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obsolete return OBSOLETE;
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on return ON;
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options return OPTIONS;
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prefix return PREFIX;
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buildprefix return BUILDPREFIX;
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pseudo-device return PSEUDO_DEVICE;
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pseudo-root return PSEUDO_ROOT;
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root return ROOT;
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select return SELECT;
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single return SINGLE;
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source return SOURCE;
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type return TYPE;
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vector return VECTOR;
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version return VERSION;
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with return WITH;
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\+= return PLUSEQ;
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:= return COLONEQ;
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<*>{WS}ifdef[ \t]+{WORD}{RESTOFLINE} {
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ifdefstate <<= IDS_SHIFT;
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if (++ifdefshift >= IDS_MAX_DEPTH) {
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yyerror("too many levels of conditional");
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}
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IDS_ENTER(ifdef, 0);
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if (IDS_PARENT_DISABLED || !getcurifdef()) {
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ifdefstate &= (uint64_t)~IDS_ENABLED;
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BEGIN(IGNORED);
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} else {
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ifdefstate |= IDS_MATCH|IDS_ENABLED;
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BEGIN(INITIAL);
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}
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IDS_EXIT(ifdef, 0);
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yyline++;
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}
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<*>{WS}ifndef[ \t]+{WORD}{RESTOFLINE} {
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ifdefstate <<= IDS_SHIFT;
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if (++ifdefshift >= IDS_MAX_DEPTH) {
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yyerror("too many levels of conditional");
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}
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IDS_ENTER(ifndef, 0);
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if (IDS_PARENT_DISABLED || getcurifdef()) {
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ifdefstate &= (uint64_t)~IDS_ENABLED;
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BEGIN(IGNORED);
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} else {
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ifdefstate |= IDS_MATCH|IDS_ENABLED;
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BEGIN(INITIAL);
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}
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IDS_EXIT(ifndef, 0);
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yyline++;
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}
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<*>{WS}elifdef[ \t]+{WORD}{RESTOFLINE} {
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int st = ifdefstate & IDS_BITS;
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IDS_ENTER(elifdef, st);
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if (ifdefshift == -1 || (st & IDS_ELSE) != 0) {
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yyerror("mismatched elifdef");
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}
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if (IDS_PARENT_DISABLED || IDS_ISMATCH(st) || !getcurifdef()) {
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ifdefstate &= (uint64_t)~IDS_ENABLED;
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BEGIN(IGNORED);
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} else {
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ifdefstate |= IDS_MATCH|IDS_ENABLED;
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BEGIN(INITIAL);
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}
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ifdefstate |= IDS_ELIF;
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IDS_EXIT(elifdef, st);
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yyline++;
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}
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<*>{WS}elifndef[ \t]+{WORD}{RESTOFLINE} {
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int st = ifdefstate & IDS_BITS;
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IDS_ENTER(elifndef, st);
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if (ifdefshift == -1 || (st & IDS_ELSE) != 0) {
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yyerror("mismatched elifndef");
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}
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if (IDS_PARENT_DISABLED || IDS_ISMATCH(st) || getcurifdef()) {
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ifdefstate &= (uint64_t)~IDS_ENABLED;
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BEGIN(IGNORED);
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} else {
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ifdefstate |= IDS_MATCH|IDS_ENABLED;
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BEGIN(INITIAL);
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}
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ifdefstate |= IDS_ELIF;
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IDS_EXIT(elifndef, st);
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yyline++;
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}
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<*>{WS}else{RESTOFLINE} {
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int st = ifdefstate & IDS_BITS;
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IDS_ENTER(else, st);
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if (ifdefshift == -1 || (st & IDS_ELSE) != 0) {
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yyerror("mismatched else");
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}
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if (IDS_PARENT_DISABLED || IDS_ISMATCH(st)) {
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ifdefstate &= (uint64_t)~IDS_ENABLED;
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BEGIN(IGNORED);
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} else {
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ifdefstate |= IDS_MATCH|IDS_ENABLED;
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BEGIN(INITIAL);
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}
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ifdefstate |= IDS_ELSE;
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IDS_ENTER(else, st);
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yyline++;
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}
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<*>{WS}endif{RESTOFLINE} {
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IDS_ENTER(endif, 0);
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if (ifdefshift == -1) {
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yyerror("mismatched endif");
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}
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if (!IDS_PARENT_DISABLED) {
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BEGIN(INITIAL);
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}
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IDS_EXIT(endif, 0);
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ifdefshift--;
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ifdefstate >>= IDS_SHIFT;
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yyline++;
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}
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<IGNORED>\n {
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yyline++;
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}
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<IGNORED>. /* ignore */
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include[ \t]+{FILENAME}{RESTOFLINE} {
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yyline++;
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if (getincludepath()) {
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include(curinclpath, 0, 0, 1);
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} else {
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yyerror("bad include path-name");
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}
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}
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cinclude[ \t]+{FILENAME}{RESTOFLINE} {
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yyline++;
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if (getincludepath()) {
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include(curinclpath, 0, 1, 1);
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} else {
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yyerror("bad cinclude path-name");
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}
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}
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package[ \t]+{FILENAME}{RESTOFLINE} {
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yyline++;
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if (!oktopackage) {
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yyerror("package not allowed here");
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} else if (getincludepath()) {
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package(curinclpath);
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} else {
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yyerror("bad package path-name");
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}
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}
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{PATH} {
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yylval.str = intern(yytext);
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return PATHNAME;
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}
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{WORD} {
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yylval.str = intern(yytext);
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return WORD;
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}
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\"\" {
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yylval.str = intern("");
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return EMPTYSTRING;
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}
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{QCHARS} {
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size_t l = strlen(yytext);
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if (l > 1 && yytext[l - 1] == '"')
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yytext[l - 1] = '\0';
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yylval.str = intern(yytext + 1);
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return QSTRING;
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}
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0[0-7]* {
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yylval.num.fmt = 8;
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yylval.num.val = strtoll(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.num.fmt = 16;
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yylval.num.val = (long long)strtoull(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.num.fmt = 10;
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yylval.num.val = strtoll(yytext, NULL, 10);
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return NUMBER;
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}
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\n[ \t] {
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/*
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* Note: newline followed by whitespace is always a
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* continuation of the previous line, so do NOT
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* return a token in this case.
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*/
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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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\00 {
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/* Detect NUL characters in the config file and
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* error out.
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*/
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cfgerror("NUL character detected at line %i", yyline);
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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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if (ifdefshift > (incl == NULL ? -1 : incl->in_ifdefshift)) {
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yyerror("reached EOF while looking for endif");
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}
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if (incl == NULL)
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return YY_NULL;
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tok = endinclude();
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if (tok)
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return tok;
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/* otherwise continue scanning */
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}
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%%
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int interesting = 1;
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static int
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curdir_push(const char *fname)
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{
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struct prefix *pf;
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char *p, *d, *f;
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/* Set up the initial "current directory" for include directives. */
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d = dirname(f = estrdup(fname));
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if (*d == '/')
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p = estrdup(d);
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else {
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char *cwd, buf[PATH_MAX];
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if ((cwd = getcwd(buf, sizeof(buf))) == NULL) {
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free(f);
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return (-1);
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}
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easprintf(&p, "%s/%s", cwd, d);
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}
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free(f);
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pf = ecalloc(1, sizeof(*pf));
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pf->pf_prefix = p;
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SLIST_INSERT_HEAD(&curdirs, pf, pf_next);
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return (0);
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}
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static void
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curdir_pop(void)
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{
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struct prefix *pf;
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pf = SLIST_FIRST(&curdirs);
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SLIST_REMOVE_HEAD(&curdirs, pf_next);
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if (SLIST_EMPTY(&curdirs))
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panic("curdirs is empty");
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/* LINTED cast away const (pf_prefix is malloc'd for curdirs) */
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free((void *)__UNCONST(pf->pf_prefix));
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free(pf);
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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(const char *fname)
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{
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#if defined(__NetBSD__)
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if ((yyin = fopen(fname, "rf")) == NULL)
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#else
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if ((yyin = fopen(fname, "r")) == NULL)
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#endif
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return (-1);
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if (curdir_push(fname) == -1)
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return (-1);
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yyfile = conffile = fname;
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yyline = 1;
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return (0);
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}
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/*
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* Add a "package" to the configuration. This is essentially
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* syntactic sugar around the sequence:
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*
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* prefix ../some/directory
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* include "files.package"
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* prefix
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*/
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void
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package(const char *fname)
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{
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char *fname1 = estrdup(fname);
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char *fname2 = estrdup(fname);
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char *dir = dirname(fname1);
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char *file = basename(fname2);
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/*
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* Push the prefix on to the prefix stack and process the include
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* file. When we reach the end of the include file, inserting
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* the PREFIX token into the input stream will pop the prefix off
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* of the prefix stack.
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*/
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prefix_push(dir);
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(void) include(file, PREFIX, 0, 1);
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free(fname1);
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free(fname2);
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}
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int includedepth;
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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 (i.e. ENDFILE).
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* If ateof == 0 then nothing is inserted.
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*/
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int
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include(const char *fname, int ateof, int conditional, int direct)
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{
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FILE *fp;
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struct incl *in;
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char *s;
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static int havedirs;
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|
extern int vflag;
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if (havedirs == 0) {
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havedirs = 1;
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setupdirs();
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}
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if (fname[0] == '/')
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s = estrdup(fname);
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else if (fname[0] == '.' && fname[1] == '/') {
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struct prefix *pf = SLIST_FIRST(&curdirs);
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easprintf(&s, "%s/%s", pf->pf_prefix, fname + 2);
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} else
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s = sourcepath(fname);
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if ((fp = fopen(s, "r")) == NULL) {
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if (conditional == 0)
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cfgerror("cannot open %s for reading: %s", s,
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strerror(errno));
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else if (vflag)
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cfgwarn("cannot open conditional include file %s: %s",
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s, strerror(errno));
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free(s);
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return (-1);
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}
|
|
if (curdir_push(s) == -1) {
|
|
cfgerror("cannot record current working directory for %s", s);
|
|
fclose(fp);
|
|
free(s);
|
|
return (-1);
|
|
}
|
|
in = ecalloc(1, sizeof *in);
|
|
in->in_prev = incl;
|
|
in->in_buf = YY_CURRENT_BUFFER;
|
|
in->in_where.w_srcfile = yyfile;
|
|
in->in_where.w_srcline = (u_short)yyline;
|
|
in->in_ateof = ateof;
|
|
in->in_interesting = interesting;
|
|
in->in_ifdefstate = ifdefstate;
|
|
in->in_ifdefshift = ifdefshift;
|
|
interesting = direct & interesting;
|
|
if (interesting)
|
|
logconfig_include(fp, fname);
|
|
incl = in;
|
|
CFGDBG(1, "include `%s'", fname);
|
|
yy_switch_to_buffer(yy_create_buffer(fp, YY_BUF_SIZE));
|
|
yyfile = intern(s);
|
|
yyline = 1;
|
|
free(s);
|
|
includedepth++;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Extract the pathname from a include/cinclude/package into curinclpath
|
|
*/
|
|
static int
|
|
getincludepath(void)
|
|
{
|
|
const char *p = yytext;
|
|
ptrdiff_t len;
|
|
const char *e;
|
|
|
|
while (*p && isascii((unsigned int)*p) && !isspace((unsigned int)*p))
|
|
p++;
|
|
while (*p && isascii((unsigned int)*p) && isspace((unsigned int)*p))
|
|
p++;
|
|
if (!*p)
|
|
return 0;
|
|
if (*p == '"') {
|
|
p++;
|
|
e = strchr(p, '"');
|
|
if (!e) return 0;
|
|
} else {
|
|
e = p;
|
|
while (*e && isascii((unsigned int)*e)
|
|
&& !isspace((unsigned int)*e))
|
|
e++;
|
|
}
|
|
|
|
len = e-p;
|
|
if (len > (ptrdiff_t)sizeof(curinclpath)-1)
|
|
len = sizeof(curinclpath)-1;
|
|
strncpy(curinclpath, p, sizeof(curinclpath));
|
|
curinclpath[len] = '\0';
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Terminate the most recent inclusion.
|
|
*/
|
|
static int
|
|
endinclude(void)
|
|
{
|
|
struct incl *in;
|
|
int ateof;
|
|
|
|
curdir_pop();
|
|
if ((in = incl) == NULL)
|
|
panic("endinclude");
|
|
incl = in->in_prev;
|
|
lastfile = yyfile;
|
|
yy_delete_buffer(YY_CURRENT_BUFFER);
|
|
(void)fclose(yyin);
|
|
yy_switch_to_buffer(in->in_buf);
|
|
yyfile = in->in_where.w_srcfile;
|
|
yyline = in->in_where.w_srcline;
|
|
ateof = in->in_ateof;
|
|
interesting = in->in_interesting;
|
|
ifdefstate = in->in_ifdefstate;
|
|
ifdefshift = in->in_ifdefshift;
|
|
free(in);
|
|
|
|
includedepth--;
|
|
|
|
return (ateof);
|
|
}
|
|
|
|
/*
|
|
* Return the current line number. If yacc has looked ahead and caused
|
|
* us to consume a newline, we have to subtract one. yychar is yacc's
|
|
* token lookahead, so we can tell.
|
|
*/
|
|
u_short
|
|
currentline(void)
|
|
{
|
|
extern int yychar;
|
|
|
|
return (u_short)(yyline - (yychar == '\n'));
|
|
}
|
|
|
|
static int
|
|
getcurifdef(void)
|
|
{
|
|
char *p = yytext, *q;
|
|
|
|
while (*p && isascii((unsigned int)*p) && !isspace((unsigned int)*p))
|
|
p++;
|
|
while (*p && isascii((unsigned int)*p) && isspace((unsigned int)*p))
|
|
p++;
|
|
q = p;
|
|
while (*q && isascii((unsigned int)*q) && !isspace((unsigned int)*q))
|
|
q++;
|
|
*q = '\0';
|
|
|
|
return ht_lookup(attrtab, intern(p)) != NULL;
|
|
}
|