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 * $FreeBSD$ 32 */ 33 34 #include <assert.h> 35 #include <ctype.h> 36 #include <string.h> 37 #include "y.tab.h" 38 #include "config.h" 39 40 #define YY_NO_UNPUT 41 42 /* 43 * Data for returning to previous files from include files. 44 */ 45 struct 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 }; 52 static struct incl *inclp; 53 static const char *lastfile; 54 55 /* 56 * Key word table 57 */ 58 59 struct 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 90 static int endinclude(void); 91 int include(const char *, int); 92 int kw_lookup(char *); 93 unsigned int octal(const char *); 94 unsigned int hex(const char *); 95 int yyerror(const char *); 96 97 %} 98 ID [A-Za-z_][-A-Za-z_0-9]* 99 PATH [./][-/.%^A-Za-z_0-9]+ 100 %START TOEOL 101 %% 102 {ID} { 103 int i; 104 105 BEGIN 0; 106 if ((i = kw_lookup(yytext)) == -1) 107 { 108 yylval.str = strdup(yytext); 109 return ID; 110 } 111 return i; 112 } 113 \\\"[^"]+\\\" { 114 BEGIN 0; 115 yytext[yyleng-2] = '"'; 116 yytext[yyleng-1] = '\0'; 117 yylval.str = strdup(yytext + 1); 118 return ID; 119 } 120 \"[^"]+\" { 121 BEGIN 0; 122 yytext[yyleng-1] = '\0'; 123 yylval.str = strdup(yytext + 1); 124 return ID; 125 } 126 <TOEOL>[^# \t\n]* { 127 BEGIN 0; 128 yylval.str = strdup(yytext); 129 return ID; 130 } 131 0[0-7]* { 132 yylval.val = octal(yytext); 133 return NUMBER; 134 } 135 0x[0-9a-fA-F]+ { 136 yylval.val = hex(yytext); 137 return NUMBER; 138 } 139 -?[1-9][0-9]* { 140 yylval.val = atoi(yytext); 141 return NUMBER; 142 } 143 "?" { 144 yylval.val = -1; 145 return NUMBER; 146 } 147 \n/[ \t] { 148 yyline++; 149 } 150 \n { 151 yyline++; 152 return SEMICOLON; 153 } 154 #.* { /* Ignored (comment) */; } 155 [ \t\f]* { /* Ignored (white space) */; } 156 ";" { return SEMICOLON; } 157 "," { return COMMA; } 158 "=" { BEGIN TOEOL; return EQUALS; } 159 <<EOF>> { 160 int tok; 161 162 if (inclp == NULL) 163 return YY_NULL; 164 tok = endinclude(); 165 if (tok != 0) 166 return tok; 167 /* otherwise continue scanning */ 168 } 169 {PATH} { 170 BEGIN 0; 171 yylval.str = strdup(yytext); 172 return PATH; 173 } 174 . { return yytext[0]; } 175 176 %% 177 /* 178 * kw_lookup 179 * Look up a string in the keyword table. Returns a -1 if the 180 * string is not a keyword otherwise it returns the keyword number 181 */ 182 183 int 184 kw_lookup(char *word) 185 { 186 struct kt *kp; 187 188 for (kp = key_words; kp->kt_name != 0; kp++) 189 if (eq(word, kp->kt_name)) 190 return kp->kt_val; 191 return -1; 192 } 193 194 /* 195 * Number conversion routines 196 */ 197 198 unsigned int 199 octal(const char *str) 200 { 201 unsigned int num; 202 203 (void) sscanf(str, "%o", &num); 204 return num; 205 } 206 207 unsigned int 208 hex(const char *str) 209 { 210 unsigned int num; 211 212 (void) sscanf(str+2, "%x", &num); 213 return num; 214 } 215 216 void 217 cfgfile_add(const char *fname) 218 { 219 struct cfgfile *cf; 220 221 cf = calloc(1, sizeof(*cf)); 222 assert(cf != NULL); 223 asprintf(&cf->cfg_path, "%s", fname); 224 STAILQ_INSERT_TAIL(&cfgfiles, cf, cfg_next); 225 } 226 227 void 228 cfgfile_removeall(void) 229 { 230 struct cfgfile *cf; 231 232 while (!STAILQ_EMPTY(&cfgfiles)) { 233 cf = STAILQ_FIRST(&cfgfiles); 234 STAILQ_REMOVE_HEAD(&cfgfiles, cfg_next); 235 if (cf->cfg_path != NULL) 236 free(cf->cfg_path); 237 free(cf); 238 } 239 } 240 241 /* 242 * Open the named file for inclusion at the current point. Returns 0 on 243 * success (file opened and previous state pushed), nonzero on failure 244 * (fopen failed, complaint made). The `ateof' parameter controls the 245 * token to be inserted at the end of the include file. If ateof == 0, 246 * then nothing is inserted. 247 */ 248 int 249 include(const char *fname, int ateof) 250 { 251 FILE *fp; 252 struct incl *in; 253 char *fnamebuf; 254 255 fnamebuf = NULL; 256 fp = fopen(fname, "r"); 257 if (fp == NULL && fname[0] != '.' && fname[0] != '/') { 258 asprintf(&fnamebuf, "../../conf/%s", fname); 259 if (fnamebuf != NULL) { 260 fp = fopen(fnamebuf, "r"); 261 free(fnamebuf); 262 } 263 } 264 if (fp == NULL) { 265 yyerror("cannot open included file"); 266 return (-1); 267 } 268 cfgfile_add(fnamebuf == NULL ? fname : fnamebuf); 269 in = malloc(sizeof(*in)); 270 assert(in != NULL); 271 in->in_prev = inclp; 272 in->in_buf = YY_CURRENT_BUFFER; 273 in->in_fname = yyfile; 274 in->in_lineno = yyline; 275 in->in_ateof = ateof; 276 inclp = in; 277 yy_switch_to_buffer(yy_create_buffer(fp, YY_BUF_SIZE)); 278 yyfile = fname; 279 yyline = 0; 280 return (0); 281 } 282 283 /* 284 * Terminate the most recent inclusion. 285 */ 286 static int 287 endinclude() 288 { 289 struct incl *in; 290 int ateof; 291 292 in = inclp; 293 assert(in != NULL); 294 inclp = in->in_prev; 295 lastfile = yyfile; 296 yy_delete_buffer(YY_CURRENT_BUFFER); 297 (void)fclose(yyin); 298 yy_switch_to_buffer(in->in_buf); 299 yyfile = in->in_fname; 300 yyline = in->in_lineno; 301 ateof = in->in_ateof; 302 free(in); 303 304 return (ateof); 305 } 306