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1 %{
2 /*-
3  * SPDX-License-Identifier: BSD-3-Clause
4  *
5  * Copyright (c) 1980, 1993
6  *      The Regents of the University of California.  All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. Neither the name of the University nor the names of its contributors
17  *    may be used to endorse or promote products derived from this software
18  *    without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  *
32  *      @(#)lang.l      8.1 (Berkeley) 6/6/93
33  * $FreeBSD$
34  */
35
36 #include <assert.h>
37 #include <ctype.h>
38 #include <err.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include "y.tab.h"
42 #include "config.h"
43
44 /*
45  * Data for returning to previous files from include files.
46  */
47 struct incl {
48         struct  incl *in_prev;  /* previous includes in effect, if any */
49         YY_BUFFER_STATE in_buf; /* previous lex state */
50         const   char *in_fname; /* previous file name */
51         int     in_lineno;      /* previous line number */
52         int     in_ateof;       /* token to insert at EOF */
53 };
54 static struct   incl *inclp;
55 static const    char *lastfile;
56
57 /*
58  * Key word table
59  */
60
61 struct kt {
62         const char *kt_name;
63         int kt_val;
64 } key_words[] = {
65         { "config",     CONFIG },
66         { "cpu",        CPU },
67         { "nocpu",      NOCPU },
68         { "device",     DEVICE },
69         { "devices",    DEVICE },
70         { "nodevice",   NODEVICE },
71         { "nodevices",  NODEVICE },
72         { "env",        ENV },
73         { "envvar",     ENVVAR },
74         { "hints",      HINTS },
75         { "ident",      IDENT },
76         { "machine",    ARCH }, /* MACHINE is defined in /sys/param.h */
77         { "makeoption", MAKEOPTIONS },
78         { "makeoptions", MAKEOPTIONS },
79         { "nomakeoption", NOMAKEOPTION },
80         { "nomakeoptions", NOMAKEOPTION },
81         { "maxusers",   MAXUSERS },
82         { "profile",    PROFILE },
83         { "option",     OPTIONS },
84         { "options",    OPTIONS },
85         { "nooption",   NOOPTION },
86         { "nooptions",  NOOPTION },
87         { "include",    INCLUDE },
88         { "files",      FILES },
89         { 0, 0 },
90 };
91
92
93 static int endinclude(void);
94 int include(const char *, int);
95 int kw_lookup(char *);
96 unsigned int octal(const char *);
97 unsigned int hex(const char *);
98 int yyerror(const char *);
99
100 #define YY_DECL int yylex(void)
101 %}
102
103 %option nounput
104 %option noinput
105
106 ID      [A-Za-z_][-A-Za-z_0-9]*
107 PATH    [./][-/.%^A-Za-z_0-9]+
108 %START TOEOL
109 %START ENVC
110 %%
111 <ENVC>[^#\n]*   {
112                         BEGIN 0;
113                         yylval.str = strdup(yytext);
114                         return ENVLINE;
115                 }
116 {ID}            {
117                         int i;
118
119                         BEGIN 0;
120                         if ((i = kw_lookup(yytext)) == -1)
121                         {
122                                 yylval.str = strdup(yytext);
123                                 return ID;
124                         }
125                         /* We'll glom onto the rest of an envvar line */
126                         if (i == ENVVAR)
127                                 BEGIN ENVC;
128                         return i;
129                 }
130 \\\"[^"]*\\\"   {
131                         BEGIN 0;
132                         yytext[yyleng-2] = '"';
133                         yytext[yyleng-1] = '\0';
134                         yylval.str = strdup(yytext + 1);
135                         return ID;
136                 }
137 \"[^"]+\"       {
138                         BEGIN 0;
139                         yytext[yyleng-1] = '\0';
140                         yylval.str = strdup(yytext + 1);
141                         return ID;
142                 }
143 <TOEOL>[^# \t\n]*       {
144                         BEGIN 0;
145                         yylval.str = strdup(yytext);
146                         return ID;
147                 }
148 0[0-7]*         {
149                         yylval.val = octal(yytext);
150                         return NUMBER;
151                 }
152 0x[0-9a-fA-F]+  {
153                         yylval.val = hex(yytext);
154                         return NUMBER;
155                 }
156 -?[1-9][0-9]*   {
157                         yylval.val = atoi(yytext);
158                         return NUMBER;
159                 }
160 "?"             {
161                         yylval.val = -1;
162                         return NUMBER;
163                 }
164 \n/[ \t]        {
165                         yyline++;
166                 }
167 \n              {
168                         yyline++;
169                         return SEMICOLON;
170                 }
171 #.*             {       /* Ignored (comment) */;        }
172 [ \t\f]*        {       /* Ignored (white space) */;    }
173 ";"             {       return SEMICOLON;               }
174 ","             {       return COMMA;                   }
175 "="             {       BEGIN TOEOL; return EQUALS;     }
176 "+="            {       BEGIN TOEOL; return PLUSEQUALS; }
177 <<EOF>>         {
178                         int tok;
179
180                         if (inclp == NULL)
181                                 return YY_NULL;
182                         tok = endinclude();
183                         if (tok != 0)
184                                 return tok;
185                         /* otherwise continue scanning */
186                 }
187 {PATH}          {
188                         BEGIN 0;
189                         yylval.str = strdup(yytext);
190                         return PATH;
191                 }
192 .               {       return yytext[0];               }
193
194 %%
195 /*
196  * kw_lookup
197  *      Look up a string in the keyword table.  Returns a -1 if the
198  *      string is not a keyword otherwise it returns the keyword number
199  */
200
201 int
202 kw_lookup(char *word)
203 {
204         struct kt *kp;
205
206         for (kp = key_words; kp->kt_name != 0; kp++)
207                 if (eq(word, kp->kt_name))
208                         return kp->kt_val;
209         return -1;
210 }
211
212 /*
213  * Number conversion routines
214  */
215
216 unsigned int
217 octal(const char *str)
218 {
219         unsigned int num;
220
221         (void) sscanf(str, "%o", &num);
222         return num;
223 }
224
225 unsigned int
226 hex(const char *str)
227 {
228         unsigned int num;
229
230         (void) sscanf(str+2, "%x", &num);
231         return num;
232 }
233
234 void
235 cfgfile_add(const char *fname)
236 {
237         struct cfgfile *cf;
238
239         cf = calloc(1, sizeof(*cf));
240         if (cf == NULL)
241                 err(EXIT_FAILURE, "calloc");
242         assert(cf != NULL);
243         asprintf(&cf->cfg_path, "%s", fname);
244         STAILQ_INSERT_TAIL(&cfgfiles, cf, cfg_next);
245 }
246
247 void
248 cfgfile_removeall(void)
249 {
250         struct cfgfile *cf;
251
252         while (!STAILQ_EMPTY(&cfgfiles)) {
253                 cf = STAILQ_FIRST(&cfgfiles);
254                 STAILQ_REMOVE_HEAD(&cfgfiles, cfg_next);
255                 if (cf->cfg_path != NULL)
256                         free(cf->cfg_path);
257                 free(cf);
258         }
259 }
260
261 /*
262  * Open the named file for inclusion at the current point.  Returns 0 on
263  * success (file opened and previous state pushed), nonzero on failure
264  * (fopen failed, complaint made).  The `ateof' parameter controls the
265  * token to be inserted at the end of the include file. If ateof == 0,
266  * then nothing is inserted.
267  */
268 int
269 include(const char *fname, int ateof)
270 {
271         FILE *fp;
272         struct incl *in;
273         struct includepath* ipath;
274         char *fnamebuf;
275
276         fnamebuf = NULL;
277         fp = fopen(fname, "r");
278         if (fp == NULL && fname[0] != '.' && fname[0] != '/') {
279                 asprintf(&fnamebuf, "../../conf/%s", fname);
280                 if (fnamebuf != NULL) {
281                         fp = fopen(fnamebuf, "r");
282                         if (fp == NULL)
283                                 free(fnamebuf);
284                 }
285         }
286         if (fp == NULL) {
287                 SLIST_FOREACH(ipath, &includepath, path_next) {
288                         asprintf(&fnamebuf, "%s/%s", ipath->path, fname);
289                         if (fnamebuf != NULL) {
290                                 fp = fopen(fnamebuf, "r");
291                         }
292                         if (fp != NULL)
293                                 break;
294                         free(fnamebuf);
295                 }
296         }
297         if (fp == NULL) {
298                 yyerror("cannot open included file");
299                 return (-1);
300         }
301         cfgfile_add(fnamebuf == NULL ? fname : fnamebuf);
302         in = malloc(sizeof(*in));
303         assert(in != NULL);
304         in->in_prev = inclp;
305         in->in_buf = YY_CURRENT_BUFFER;
306         in->in_fname = yyfile;
307         in->in_lineno = yyline;
308         in->in_ateof = ateof;
309         inclp = in;
310         yy_switch_to_buffer(yy_create_buffer(fp, YY_BUF_SIZE));
311         yyfile = fname;
312         yyline = 0;
313         return (0);
314 }
315
316 /*
317  * Terminate the most recent inclusion.
318  */
319 static int
320 endinclude(void)
321 {
322         struct incl *in;
323         int ateof;
324
325         in = inclp;
326         assert(in != NULL);
327         inclp = in->in_prev;
328         lastfile = yyfile;
329         yy_delete_buffer(YY_CURRENT_BUFFER);
330         (void)fclose(yyin);
331         yy_switch_to_buffer(in->in_buf);
332         yyfile = in->in_fname;
333         yyline = in->in_lineno;
334         ateof  = in->in_ateof;
335         free(in);
336
337         return (ateof);
338 }