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 "+=" { BEGIN TOEOL; return PLUSEQUALS; } 160 <<EOF>> { 161 int tok; 162 163 if (inclp == NULL) 164 return YY_NULL; 165 tok = endinclude(); 166 if (tok != 0) 167 return tok; 168 /* otherwise continue scanning */ 169 } 170 {PATH} { 171 BEGIN 0; 172 yylval.str = strdup(yytext); 173 return PATH; 174 } 175 . { return yytext[0]; } 176 177 %% 178 /* 179 * kw_lookup 180 * Look up a string in the keyword table. Returns a -1 if the 181 * string is not a keyword otherwise it returns the keyword number 182 */ 183 184 int 185 kw_lookup(char *word) 186 { 187 struct kt *kp; 188 189 for (kp = key_words; kp->kt_name != 0; kp++) 190 if (eq(word, kp->kt_name)) 191 return kp->kt_val; 192 return -1; 193 } 194 195 /* 196 * Number conversion routines 197 */ 198 199 unsigned int 200 octal(const char *str) 201 { 202 unsigned int num; 203 204 (void) sscanf(str, "%o", &num); 205 return num; 206 } 207 208 unsigned int 209 hex(const char *str) 210 { 211 unsigned int num; 212 213 (void) sscanf(str+2, "%x", &num); 214 return num; 215 } 216 217 void 218 cfgfile_add(const char *fname) 219 { 220 struct cfgfile *cf; 221 222 cf = calloc(1, sizeof(*cf)); 223 assert(cf != NULL); 224 asprintf(&cf->cfg_path, "%s", fname); 225 STAILQ_INSERT_TAIL(&cfgfiles, cf, cfg_next); 226 } 227 228 void 229 cfgfile_removeall(void) 230 { 231 struct cfgfile *cf; 232 233 while (!STAILQ_EMPTY(&cfgfiles)) { 234 cf = STAILQ_FIRST(&cfgfiles); 235 STAILQ_REMOVE_HEAD(&cfgfiles, cfg_next); 236 if (cf->cfg_path != NULL) 237 free(cf->cfg_path); 238 free(cf); 239 } 240 } 241 242 /* 243 * Open the named file for inclusion at the current point. Returns 0 on 244 * success (file opened and previous state pushed), nonzero on failure 245 * (fopen failed, complaint made). The `ateof' parameter controls the 246 * token to be inserted at the end of the include file. If ateof == 0, 247 * then nothing is inserted. 248 */ 249 int 250 include(const char *fname, int ateof) 251 { 252 FILE *fp; 253 struct incl *in; 254 char *fnamebuf; 255 256 fnamebuf = NULL; 257 fp = fopen(fname, "r"); 258 if (fp == NULL && fname[0] != '.' && fname[0] != '/') { 259 asprintf(&fnamebuf, "../../conf/%s", fname); 260 if (fnamebuf != NULL) { 261 fp = fopen(fnamebuf, "r"); 262 free(fnamebuf); 263 } 264 } 265 if (fp == NULL) { 266 yyerror("cannot open included file"); 267 return (-1); 268 } 269 cfgfile_add(fnamebuf == NULL ? fname : fnamebuf); 270 in = malloc(sizeof(*in)); 271 assert(in != NULL); 272 in->in_prev = inclp; 273 in->in_buf = YY_CURRENT_BUFFER; 274 in->in_fname = yyfile; 275 in->in_lineno = yyline; 276 in->in_ateof = ateof; 277 inclp = in; 278 yy_switch_to_buffer(yy_create_buffer(fp, YY_BUF_SIZE)); 279 yyfile = fname; 280 yyline = 0; 281 return (0); 282 } 283 284 /* 285 * Terminate the most recent inclusion. 286 */ 287 static int 288 endinclude() 289 { 290 struct incl *in; 291 int ateof; 292 293 in = inclp; 294 assert(in != NULL); 295 inclp = in->in_prev; 296 lastfile = yyfile; 297 yy_delete_buffer(YY_CURRENT_BUFFER); 298 (void)fclose(yyin); 299 yy_switch_to_buffer(in->in_buf); 300 yyfile = in->in_fname; 301 yyline = in->in_lineno; 302 ateof = in->in_ateof; 303 free(in); 304 305 return (ateof); 306 } 307