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