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 %START TOEOL 100 %% 101 {ID} { 102 int i; 103 104 BEGIN 0; 105 if ((i = kw_lookup(yytext)) == -1) 106 { 107 yylval.str = strdup(yytext); 108 return ID; 109 } 110 return i; 111 } 112 \\\"[^"]+\\\" { 113 BEGIN 0; 114 yytext[yyleng-2] = '"'; 115 yytext[yyleng-1] = '\0'; 116 yylval.str = strdup(yytext + 1); 117 return ID; 118 } 119 \"[^"]+\" { 120 BEGIN 0; 121 yytext[yyleng-1] = '\0'; 122 yylval.str = strdup(yytext + 1); 123 return ID; 124 } 125 <TOEOL>[^# \t\n]* { 126 BEGIN 0; 127 yylval.str = strdup(yytext); 128 return ID; 129 } 130 0[0-7]* { 131 yylval.val = octal(yytext); 132 return NUMBER; 133 } 134 0x[0-9a-fA-F]+ { 135 yylval.val = hex(yytext); 136 return NUMBER; 137 } 138 -?[1-9][0-9]* { 139 yylval.val = atoi(yytext); 140 return NUMBER; 141 } 142 "?" { 143 yylval.val = -1; 144 return NUMBER; 145 } 146 \n/[ \t] { 147 yyline++; 148 } 149 \n { 150 yyline++; 151 return SEMICOLON; 152 } 153 #.* { /* Ignored (comment) */; } 154 [ \t\f]* { /* Ignored (white space) */; } 155 ";" { return SEMICOLON; } 156 "," { return COMMA; } 157 "=" { BEGIN TOEOL; return EQUALS; } 158 <<EOF>> { 159 int tok; 160 161 if (inclp == NULL) 162 return YY_NULL; 163 tok = endinclude(); 164 if (tok != 0) 165 return tok; 166 /* otherwise continue scanning */ 167 } 168 . { return yytext[0]; } 169 170 %% 171 /* 172 * kw_lookup 173 * Look up a string in the keyword table. Returns a -1 if the 174 * string is not a keyword otherwise it returns the keyword number 175 */ 176 177 int 178 kw_lookup(char *word) 179 { 180 struct kt *kp; 181 182 for (kp = key_words; kp->kt_name != 0; kp++) 183 if (eq(word, kp->kt_name)) 184 return kp->kt_val; 185 return -1; 186 } 187 188 /* 189 * Number conversion routines 190 */ 191 192 unsigned int 193 octal(const char *str) 194 { 195 unsigned int num; 196 197 (void) sscanf(str, "%o", &num); 198 return num; 199 } 200 201 unsigned int 202 hex(const char *str) 203 { 204 unsigned int num; 205 206 (void) sscanf(str+2, "%x", &num); 207 return num; 208 } 209 210 211 /* 212 * Open the named file for inclusion at the current point. Returns 0 on 213 * success (file opened and previous state pushed), nonzero on failure 214 * (fopen failed, complaint made). The `ateof' parameter controls the 215 * token to be inserted at the end of the include file. If ateof == 0, 216 * then nothing is inserted. 217 */ 218 int 219 include(const char *fname, int ateof) 220 { 221 FILE *fp; 222 struct incl *in; 223 char *fnamebuf; 224 225 fp = fopen(fname, "r"); 226 if (fp == NULL && fname[0] != '.' && fname[0] != '/') { 227 asprintf(&fnamebuf, "../../conf/%s", fname); 228 if (fnamebuf != NULL) { 229 fp = fopen(fnamebuf, "r"); 230 free(fnamebuf); 231 } 232 } 233 if (fp == NULL) { 234 yyerror("cannot open included file"); 235 return (-1); 236 } 237 in = malloc(sizeof(*in)); 238 assert(in != NULL); 239 in->in_prev = inclp; 240 in->in_buf = YY_CURRENT_BUFFER; 241 in->in_fname = yyfile; 242 in->in_lineno = yyline; 243 in->in_ateof = ateof; 244 inclp = in; 245 yy_switch_to_buffer(yy_create_buffer(fp, YY_BUF_SIZE)); 246 yyfile = fname; 247 yyline = 0; 248 return (0); 249 } 250 251 /* 252 * Terminate the most recent inclusion. 253 */ 254 static int 255 endinclude() 256 { 257 struct incl *in; 258 int ateof; 259 260 in = inclp; 261 assert(in != NULL); 262 inclp = in->in_prev; 263 lastfile = yyfile; 264 yy_delete_buffer(YY_CURRENT_BUFFER); 265 (void)fclose(yyin); 266 yy_switch_to_buffer(in->in_buf); 267 yyfile = in->in_fname; 268 yyline = in->in_lineno; 269 ateof = in->in_ateof; 270 free(in); 271 272 return (ateof); 273 } 274