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 { "device", DEVICE }, 66 { "nodevice", NODEVICE }, 67 { "env", ENV }, 68 { "hints", HINTS }, 69 { "ident", IDENT }, 70 { "machine", ARCH }, /* MACHINE is defined in /sys/param.h */ 71 { "makeoptions", MAKEOPTIONS }, 72 { "nomakeoption", NOMAKEOPTION }, 73 { "maxusers", MAXUSERS }, 74 { "profile", PROFILE }, 75 { "option", OPTIONS }, 76 { "options", OPTIONS }, 77 { "nooption", NOOPTION }, 78 { "nooptions", NOOPTION }, 79 { "include", INCLUDE }, 80 { "files", FILES }, 81 { 0, 0 }, 82 }; 83 84 85 static int endinclude(void); 86 int include(const char *, int); 87 int kw_lookup(char *); 88 unsigned int octal(const char *); 89 unsigned int hex(const char *); 90 int yyerror(const char *); 91 92 %} 93 ID [A-Za-z_][-A-Za-z_0-9]* 94 %START TOEOL 95 %% 96 {ID} { 97 int i; 98 99 BEGIN 0; 100 if ((i = kw_lookup(yytext)) == -1) 101 { 102 yylval.str = strdup(yytext); 103 return ID; 104 } 105 return i; 106 } 107 \\\"[^"]+\\\" { 108 BEGIN 0; 109 yytext[yyleng-2] = '"'; 110 yytext[yyleng-1] = '\0'; 111 yylval.str = strdup(yytext + 1); 112 return ID; 113 } 114 \"[^"]+\" { 115 BEGIN 0; 116 yytext[yyleng-1] = '\0'; 117 yylval.str = strdup(yytext + 1); 118 return ID; 119 } 120 <TOEOL>[^# \t\n]* { 121 BEGIN 0; 122 yylval.str = strdup(yytext); 123 return ID; 124 } 125 0[0-7]* { 126 yylval.val = octal(yytext); 127 return NUMBER; 128 } 129 0x[0-9a-fA-F]+ { 130 yylval.val = hex(yytext); 131 return NUMBER; 132 } 133 -?[1-9][0-9]* { 134 yylval.val = atoi(yytext); 135 return NUMBER; 136 } 137 "?" { 138 yylval.val = -1; 139 return NUMBER; 140 } 141 \n/[ \t] { 142 yyline++; 143 } 144 \n { 145 yyline++; 146 return SEMICOLON; 147 } 148 #.* { /* Ignored (comment) */; } 149 [ \t\f]* { /* Ignored (white space) */; } 150 ";" { return SEMICOLON; } 151 "," { return COMMA; } 152 "=" { BEGIN TOEOL; return EQUALS; } 153 <<EOF>> { 154 int tok; 155 156 if (inclp == NULL) 157 return YY_NULL; 158 tok = endinclude(); 159 if (tok != 0) 160 return tok; 161 /* otherwise continue scanning */ 162 } 163 . { return yytext[0]; } 164 165 %% 166 /* 167 * kw_lookup 168 * Look up a string in the keyword table. Returns a -1 if the 169 * string is not a keyword otherwise it returns the keyword number 170 */ 171 172 int 173 kw_lookup(char *word) 174 { 175 struct kt *kp; 176 177 for (kp = key_words; kp->kt_name != 0; kp++) 178 if (eq(word, kp->kt_name)) 179 return kp->kt_val; 180 return -1; 181 } 182 183 /* 184 * Number conversion routines 185 */ 186 187 unsigned int 188 octal(const char *str) 189 { 190 unsigned int num; 191 192 (void) sscanf(str, "%o", &num); 193 return num; 194 } 195 196 unsigned int 197 hex(const char *str) 198 { 199 unsigned int num; 200 201 (void) sscanf(str+2, "%x", &num); 202 return num; 203 } 204 205 206 /* 207 * Open the named file for inclusion at the current point. Returns 0 on 208 * success (file opened and previous state pushed), nonzero on failure 209 * (fopen failed, complaint made). The `ateof' parameter controls the 210 * token to be inserted at the end of the include file. If ateof == 0, 211 * then nothing is inserted. 212 */ 213 int 214 include(const char *fname, int ateof) 215 { 216 FILE *fp; 217 struct incl *in; 218 char *fnamebuf; 219 220 fp = fopen(fname, "r"); 221 if (fp == NULL && fname[0] != '.' && fname[0] != '/') { 222 asprintf(&fnamebuf, "../../conf/%s", fname); 223 if (fnamebuf != NULL) { 224 fp = fopen(fnamebuf, "r"); 225 free(fnamebuf); 226 } 227 } 228 if (fp == NULL) { 229 yyerror("cannot open included file"); 230 return (-1); 231 } 232 in = malloc(sizeof(*in)); 233 assert(in != NULL); 234 in->in_prev = inclp; 235 in->in_buf = YY_CURRENT_BUFFER; 236 in->in_fname = yyfile; 237 in->in_lineno = yyline; 238 in->in_ateof = ateof; 239 inclp = in; 240 yy_switch_to_buffer(yy_create_buffer(fp, YY_BUF_SIZE)); 241 yyfile = fname; 242 yyline = 0; 243 return (0); 244 } 245 246 /* 247 * Terminate the most recent inclusion. 248 */ 249 static int 250 endinclude() 251 { 252 struct incl *in; 253 int ateof; 254 255 in = inclp; 256 assert(in != NULL); 257 inclp = in->in_prev; 258 lastfile = yyfile; 259 yy_delete_buffer(YY_CURRENT_BUFFER); 260 (void)fclose(yyin); 261 yy_switch_to_buffer(in->in_buf); 262 yyfile = in->in_fname; 263 yyline = in->in_lineno; 264 ateof = in->in_ateof; 265 free(in); 266 267 return (ateof); 268 } 269