1 %{ 2 /* $OpenBSD: scan.l,v 1.14 2001/01/23 06:02:59 angelos Exp $ */ 3 /* $NetBSD: scan.l,v 1.13 1997/02/02 21:12:37 thorpej Exp $ */ 4 5 /* 6 * Copyright (c) 1992, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * This software was developed by the Computer Systems Engineering group 10 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 11 * contributed to Berkeley. 12 * 13 * All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Lawrence Berkeley Laboratories. 17 * 18 * Redistribution and use in source and binary forms, with or without 19 * modification, are permitted provided that the following conditions 20 * are met: 21 * 1. Redistributions of source code must retain the above copyright 22 * notice, this list of conditions and the following disclaimer. 23 * 2. Redistributions in binary form must reproduce the above copyright 24 * notice, this list of conditions and the following disclaimer in the 25 * documentation and/or other materials provided with the distribution. 26 * 3. All advertising materials mentioning features or use of this software 27 * must display the following acknowledgement: 28 * This product includes software developed by the University of 29 * California, Berkeley and its contributors. 30 * 4. Neither the name of the University nor the names of its contributors 31 * may be used to endorse or promote products derived from this software 32 * without specific prior written permission. 33 * 34 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 35 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 36 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 37 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 38 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 39 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 40 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 41 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 42 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 43 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 44 * SUCH DAMAGE. 45 * 46 * from: @(#)scan.l 8.1 (Berkeley) 6/6/93 47 */ 48 49 #include <sys/param.h> 50 #include <errno.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <unistd.h> 55 #include "config.h" 56 #include "y.tab.h" 57 58 int yyline; 59 const char *yyfile; 60 const char *lastfile; 61 62 /* 63 * Data for returning to previous files from include files. 64 */ 65 struct incl { 66 struct incl *in_prev; /* previous includes in effect, if any */ 67 YY_BUFFER_STATE in_buf; /* previous lex state */ 68 const char *in_fname; /* previous file name */ 69 int in_lineno; /* previous line number */ 70 int in_ateof; /* token to insert at EOF */ 71 }; 72 static struct incl *incl; 73 static int endinclude __P((void)); 74 75 #define yywrap() 1 76 77 %} 78 79 PATH [A-Za-z_0-9]*[./][-A-Za-z_0-9./]* 80 WORD [A-Za-z_][-A-Za-z_0-9]* 81 82 %% 83 /* Local variables for yylex() */ 84 int tok; 85 86 and return AND; 87 at return AT; 88 attach return ATTACH; 89 build return BUILD; 90 compile-with return COMPILE_WITH; 91 config return CONFIG; 92 define return DEFINE; 93 defopt return DEFOPT; 94 device return DEVICE; 95 disable return DISABLE; 96 enable return ENABLE; 97 dumps return DUMPS; 98 file return XFILE; 99 flags return FLAGS; 100 include return INCLUDE; 101 machine return XMACHINE; 102 major return MAJOR; 103 makeoptions return MAKEOPTIONS; 104 makeoption return MAKEOPTIONS; 105 maxpartitions return MAXPARTITIONS; 106 maxusers return MAXUSERS; 107 minor return MINOR; 108 needs-count return NEEDS_COUNT; 109 needs-flag return NEEDS_FLAG; 110 object return XOBJECT; 111 on return ON; 112 options return OPTIONS; 113 option return OPTIONS; 114 pseudo-device return PSEUDO_DEVICE; 115 root return ROOT; 116 source return SOURCE; 117 swap return SWAP; 118 with return WITH; 119 rmoption return RMOPTIONS; 120 rmoptions return RMOPTIONS; 121 122 {PATH} { 123 yylval.str = intern(yytext); 124 return PATHNAME; 125 } 126 {WORD} { 127 yylval.str = intern(yytext); 128 return WORD; 129 } 130 131 \"\" { 132 yylval.str = intern(""); 133 return EMPTY; 134 } 135 \"([^"\n]|\\\")+ { 136 tok = input(); /* eat closing quote */ 137 if (tok != '"') { 138 error("closing quote missing\n"); 139 unput(tok); 140 } 141 yylval.str = intern(yytext + 1); 142 return WORD; 143 } 144 0[0-7]* { 145 yylval.val = strtol(yytext, NULL, 8); 146 return NUMBER; 147 } 148 0[xX][0-9a-fA-F]+ { 149 yylval.val = strtoul(yytext + 2, NULL, 16); 150 return NUMBER; 151 } 152 [1-9][0-9]* { 153 yylval.val = strtol(yytext, NULL, 10); 154 return NUMBER; 155 } 156 \n[ \t] { 157 /* 158 * Note: newline followed by whitespace is always a 159 * continuation of the previous line, so do NOT 160 * return a token in this case. 161 */ 162 yyline++; 163 } 164 \n { 165 yyline++; 166 return '\n'; 167 } 168 #.* { /* ignored (comment) */; } 169 [ \t]+ { /* ignored (white space) */; } 170 . { return yytext[0]; } 171 <<EOF>> { 172 if (incl == NULL) 173 return YY_NULL; 174 tok = endinclude(); 175 if (tok) 176 return tok; 177 /* otherwise continue scanning */ 178 } 179 180 %% 181 182 /* 183 * Open the "main" file (conffile). 184 */ 185 int 186 firstfile(fname) 187 const char *fname; 188 { 189 190 if ((yyin = fopen(fname, "r")) == NULL) 191 return (-1); 192 yyfile = conffile = fname; 193 yyline = 1; 194 return (0); 195 } 196 197 /* 198 * Open the named file for inclusion at the current point. Returns 0 on 199 * success (file opened and previous state pushed), nonzero on failure 200 * (fopen failed, complaint made). The `ateof' parameter controls the 201 * token to be inserted at the end of the include file (i.e. ENDFILE). 202 * If ateof == 0 then nothing is inserted. 203 */ 204 int 205 include(fname, ateof) 206 const char *fname; 207 int ateof; 208 { 209 FILE *fp; 210 struct incl *in; 211 char *s; 212 static int havedirs; 213 214 if (havedirs == 0) { 215 havedirs = 1; 216 setupdirs(); 217 } 218 219 /* Kludge until files.* files are fixed. */ 220 if (strncmp(fname, "../../../", 9) == 0) 221 fname += 9; 222 223 s = (*fname == '/') ? strdup(fname) : sourcepath(fname); 224 if ((fp = fopen(s, "r")) == NULL) { 225 error("cannot open %s for reading: %s\n", s, strerror(errno)); 226 free(s); 227 return (-1); 228 } 229 in = emalloc(sizeof *in); 230 in->in_prev = incl; 231 in->in_buf = YY_CURRENT_BUFFER; 232 in->in_fname = yyfile; 233 in->in_lineno = yyline; 234 in->in_ateof = ateof; 235 incl = in; 236 yy_switch_to_buffer(yy_create_buffer(fp, YY_BUF_SIZE)); 237 yyfile = intern(s); 238 yyline = 1; 239 free(s); 240 return (0); 241 } 242 243 /* 244 * Terminate the most recent inclusion. 245 */ 246 static int 247 endinclude() 248 { 249 struct incl *in; 250 int ateof; 251 252 if ((in = incl) == NULL) 253 panic("endinclude"); 254 incl = in->in_prev; 255 lastfile = yyfile; 256 yy_delete_buffer(YY_CURRENT_BUFFER); 257 (void)fclose(yyin); 258 yy_switch_to_buffer(in->in_buf); 259 yyfile = in->in_fname; 260 yyline = in->in_lineno; 261 ateof = in->in_ateof; 262 free(in); 263 264 return (ateof); 265 } 266 267 /* 268 * Return the current line number. If yacc has looked ahead and caused 269 * us to consume a newline, we have to subtract one. yychar is yacc's 270 * token lookahead, so we can tell. 271 */ 272 int 273 currentline() 274 { 275 extern int yychar; 276 277 return (yyline - (yychar == '\n')); 278 } 279