1%{
2/*-
3 * Copyright (c) 1980, 1993
4 *	The Regents of the University of California.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 4. Neither the name of the University nor the names of its contributors
15 *    may be used to endorse or promote products derived from this software
16 *    without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 *	@(#)lang.l	8.1 (Berkeley) 6/6/93
31 * $FreeBSD: releng/10.3/usr.sbin/config/lang.l 264325 2014-04-10 19:51:33Z asomers $
32 */
33
34#include <assert.h>
35#include <ctype.h>
36#include <err.h>
37#include <stdlib.h>
38#include <string.h>
39#include "y.tab.h"
40#include "config.h"
41
42/*
43 * Data for returning to previous files from include files.
44 */
45struct incl {
46	struct	incl *in_prev; 	/* previous includes in effect, if any */
47	YY_BUFFER_STATE in_buf;	/* previous lex state */
48	const	char *in_fname;	/* previous file name */
49	int	in_lineno;	/* previous line number */
50	int	in_ateof;	/* token to insert at EOF */
51};
52static struct	incl *inclp;
53static const	char *lastfile;
54
55/*
56 * Key word table
57 */
58
59struct kt {
60	const char *kt_name;
61	int kt_val;
62} key_words[] = {
63	{ "config",	CONFIG },
64	{ "cpu",	CPU },
65	{ "nocpu",	NOCPU },
66	{ "device",	DEVICE },
67	{ "devices",	DEVICE },
68	{ "nodevice",	NODEVICE },
69	{ "nodevices",	NODEVICE },
70	{ "env",	ENV },
71	{ "hints",	HINTS },
72	{ "ident",	IDENT },
73	{ "machine",	ARCH }, /* MACHINE is defined in /sys/param.h */
74	{ "makeoption",	MAKEOPTIONS },
75	{ "makeoptions", MAKEOPTIONS },
76	{ "nomakeoption", NOMAKEOPTION },
77	{ "nomakeoptions", NOMAKEOPTION },
78	{ "maxusers",	MAXUSERS },
79	{ "profile",	PROFILE },
80	{ "option",	OPTIONS },
81	{ "options",	OPTIONS },
82	{ "nooption",	NOOPTION },
83	{ "nooptions",	NOOPTION },
84	{ "include",	INCLUDE },
85	{ "files", 	FILES },
86	{ 0, 0 },
87};
88
89
90static int endinclude(void);
91int include(const char *, int);
92int kw_lookup(char *);
93unsigned int octal(const char *);
94unsigned int hex(const char *);
95int yyerror(const char *);
96
97#define YY_DECL int yylex(void)
98%}
99
100%option nounput
101%option noinput
102
103ID	[A-Za-z_][-A-Za-z_0-9]*
104PATH	[./][-/.%^A-Za-z_0-9]+
105%START TOEOL
106%%
107{ID}		{
108			int i;
109
110			BEGIN 0;
111			if ((i = kw_lookup(yytext)) == -1)
112			{
113				yylval.str = strdup(yytext);
114				return ID;
115			}
116			return i;
117		}
118\\\"[^"]+\\\"	{
119			BEGIN 0;
120			yytext[yyleng-2] = '"';
121			yytext[yyleng-1] = '\0';
122			yylval.str = strdup(yytext + 1);
123			return ID;
124		}
125\"[^"]+\"	{
126			BEGIN 0;
127			yytext[yyleng-1] = '\0';
128			yylval.str = strdup(yytext + 1);
129			return ID;
130		}
131<TOEOL>[^# \t\n]*	{
132			BEGIN 0;
133			yylval.str = strdup(yytext);
134			return ID;
135		}
1360[0-7]*		{
137			yylval.val = octal(yytext);
138			return NUMBER;
139		}
1400x[0-9a-fA-F]+	{
141			yylval.val = hex(yytext);
142			return NUMBER;
143		}
144-?[1-9][0-9]*	{
145			yylval.val = atoi(yytext);
146			return NUMBER;
147		}
148"?"		{
149			yylval.val = -1;
150			return NUMBER;
151		}
152\n/[ \t]	{
153			yyline++;
154		}
155\n		{
156			yyline++;
157			return SEMICOLON;
158		}
159#.*		{	/* Ignored (comment) */;	}
160[ \t\f]*	{	/* Ignored (white space) */;	}
161";"		{	return SEMICOLON;		}
162","		{	return COMMA;			}
163"="		{	BEGIN TOEOL; return EQUALS;	}
164"+="		{	BEGIN TOEOL; return PLUSEQUALS;	}
165<<EOF>>		{
166			int tok;
167
168			if (inclp == NULL)
169				return YY_NULL;
170			tok = endinclude();
171			if (tok != 0)
172				return tok;
173			/* otherwise continue scanning */
174		}
175{PATH}		{
176			BEGIN 0;
177			yylval.str = strdup(yytext);
178			return PATH;
179		}
180.		{	return yytext[0];		}
181
182%%
183/*
184 * kw_lookup
185 *	Look up a string in the keyword table.  Returns a -1 if the
186 *	string is not a keyword otherwise it returns the keyword number
187 */
188
189int
190kw_lookup(char *word)
191{
192	struct kt *kp;
193
194	for (kp = key_words; kp->kt_name != 0; kp++)
195		if (eq(word, kp->kt_name))
196			return kp->kt_val;
197	return -1;
198}
199
200/*
201 * Number conversion routines
202 */
203
204unsigned int
205octal(const char *str)
206{
207	unsigned int num;
208
209	(void) sscanf(str, "%o", &num);
210	return num;
211}
212
213unsigned int
214hex(const char *str)
215{
216	unsigned int num;
217
218	(void) sscanf(str+2, "%x", &num);
219	return num;
220}
221
222void
223cfgfile_add(const char *fname)
224{
225	struct cfgfile *cf;
226
227	cf = calloc(1, sizeof(*cf));
228	if (cf == NULL)
229		err(EXIT_FAILURE, "calloc");
230	assert(cf != NULL);
231	asprintf(&cf->cfg_path, "%s", fname);
232	STAILQ_INSERT_TAIL(&cfgfiles, cf, cfg_next);
233}
234
235void
236cfgfile_removeall(void)
237{
238	struct cfgfile *cf;
239
240	while (!STAILQ_EMPTY(&cfgfiles)) {
241		cf = STAILQ_FIRST(&cfgfiles);
242		STAILQ_REMOVE_HEAD(&cfgfiles, cfg_next);
243		if (cf->cfg_path != NULL)
244			free(cf->cfg_path);
245		free(cf);
246	}
247}
248
249/*
250 * Open the named file for inclusion at the current point.  Returns 0 on
251 * success (file opened and previous state pushed), nonzero on failure
252 * (fopen failed, complaint made).  The `ateof' parameter controls the
253 * token to be inserted at the end of the include file. If ateof == 0,
254 * then nothing is inserted.
255 */
256int
257include(const char *fname, int ateof)
258{
259	FILE *fp;
260	struct incl *in;
261	struct includepath* ipath;
262	char *fnamebuf;
263
264	fnamebuf = NULL;
265	fp = fopen(fname, "r");
266	if (fp == NULL && fname[0] != '.' && fname[0] != '/') {
267		asprintf(&fnamebuf, "../../conf/%s", fname);
268		if (fnamebuf != NULL) {
269			fp = fopen(fnamebuf, "r");
270			free(fnamebuf);
271		}
272	}
273	if (fp == NULL) {
274		SLIST_FOREACH(ipath, &includepath, path_next) {
275			asprintf(&fnamebuf, "%s/%s", ipath->path, fname);
276			if (fnamebuf != NULL) {
277				fp = fopen(fnamebuf, "r");
278				free(fnamebuf);
279			}
280			if (fp != NULL)
281				break;
282		}
283	}
284	if (fp == NULL) {
285		yyerror("cannot open included file");
286		return (-1);
287	}
288	cfgfile_add(fnamebuf == NULL ? fname : fnamebuf);
289	in = malloc(sizeof(*in));
290	assert(in != NULL);
291	in->in_prev = inclp;
292	in->in_buf = YY_CURRENT_BUFFER;
293	in->in_fname = yyfile;
294	in->in_lineno = yyline;
295	in->in_ateof = ateof;
296	inclp = in;
297	yy_switch_to_buffer(yy_create_buffer(fp, YY_BUF_SIZE));
298	yyfile = fname;
299	yyline = 0;
300	return (0);
301}
302
303/*
304 * Terminate the most recent inclusion.
305 */
306static int
307endinclude(void)
308{
309	struct incl *in;
310	int ateof;
311
312	in = inclp;
313	assert(in != NULL);
314	inclp = in->in_prev;
315	lastfile = yyfile;
316	yy_delete_buffer(YY_CURRENT_BUFFER);
317	(void)fclose(yyin);
318	yy_switch_to_buffer(in->in_buf);
319	yyfile = in->in_fname;
320	yyline = in->in_lineno;
321	ateof  = in->in_ateof;
322	free(in);
323
324	return (ateof);
325}
326