1 %{ 2 /* $OpenBSD: scan.l,v 1.25 2023/06/16 16:14:34 tb 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. Neither the name of the University nor the names of its contributors 27 * may be used to endorse or promote products derived from this software 28 * without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 40 * SUCH DAMAGE. 41 * 42 * from: @(#)scan.l 8.1 (Berkeley) 6/6/93 43 */ 44 45 #include <errno.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <unistd.h> 50 #include "config.h" 51 #include "gram.h" 52 53 int yyline; 54 const char *yyfile; 55 const char *lastfile; 56 57 /* 58 * Data for returning to previous files from include files. 59 */ 60 struct incl { 61 struct incl *in_prev; /* previous includes in effect, if any */ 62 YY_BUFFER_STATE in_buf; /* previous lex state */ 63 const char *in_fname; /* previous file name */ 64 int in_lineno; /* previous line number */ 65 int in_ateof; /* token to insert at EOF */ 66 }; 67 static struct incl *incl; 68 static int endinclude(void); 69 70 %} 71 72 %option noyywrap 73 74 PATH [A-Za-z_0-9]*[./][-A-Za-z_0-9./\$\{\}]* 75 WORD [A-Za-z_][-A-Za-z_0-9]* 76 77 %% 78 /* Local variables for yylex() */ 79 int tok; 80 81 and return AND; 82 at return AT; 83 attach return ATTACH; 84 build return BUILD; 85 compile-with return COMPILE_WITH; 86 config return CONFIG; 87 define return DEFINE; 88 defopt return DEFOPT; 89 device return DEVICE; 90 disable return DISABLE; 91 enable return ENABLE; 92 dumps return DUMPS; 93 file return XFILE; 94 flags return FLAGS; 95 include return INCLUDE; 96 machine return XMACHINE; 97 major return MAJOR; 98 makeoptions return MAKEOPTIONS; 99 makeoption return MAKEOPTIONS; 100 maxpartitions return MAXPARTITIONS; 101 maxusers return MAXUSERS; 102 minor return MINOR; 103 needs-count return NEEDS_COUNT; 104 needs-flag return NEEDS_FLAG; 105 object return XOBJECT; 106 on return ON; 107 options return OPTIONS; 108 option return OPTIONS; 109 pseudo-device return PSEUDO_DEVICE; 110 root return ROOT; 111 source return SOURCE; 112 swap return SWAP; 113 with return WITH; 114 rmoption return RMOPTIONS; 115 rmoptions return RMOPTIONS; 116 117 {PATH} { 118 yylval.str = intern(yytext); 119 return PATHNAME; 120 } 121 {WORD} { 122 yylval.str = intern(yytext); 123 return WORD; 124 } 125 126 \"\" { 127 yylval.str = intern(""); 128 return EMPTY; 129 } 130 \"([^"\n]|\\\")+ { 131 tok = input(); /* eat closing quote */ 132 yylval.str = intern(yytext + 1); 133 if (tok != '"') { 134 error("closing quote missing"); 135 unput(tok); 136 } 137 return WORD; 138 } 139 0[0-7]* { 140 yylval.val = strtol(yytext, NULL, 8); 141 return NUMBER; 142 } 143 0[xX][0-9a-fA-F]+ { 144 yylval.val = strtoul(yytext + 2, NULL, 16); 145 return NUMBER; 146 } 147 [1-9][0-9]* { 148 yylval.val = strtol(yytext, NULL, 10); 149 return NUMBER; 150 } 151 \n[ \t] { 152 /* 153 * Note: newline followed by whitespace is always a 154 * continuation of the previous line, so do NOT 155 * return a token in this case. 156 */ 157 yyline++; 158 } 159 \n { 160 yyline++; 161 return '\n'; 162 } 163 #.* { /* ignored (comment) */; } 164 [ \t]+ { /* ignored (white space) */; } 165 . { return yytext[0]; } 166 <<EOF>> { 167 if (incl == NULL) 168 return YY_NULL; 169 tok = endinclude(); 170 if (tok) 171 return tok; 172 /* otherwise continue scanning */ 173 } 174 175 %% 176 177 /* 178 * Open the "main" file (conffile). 179 */ 180 int 181 firstfile(const char *fname) 182 { 183 184 if ((yyin = fopen(fname, "r")) == NULL) 185 return (-1); 186 yyfile = conffile = fname; 187 yyline = 1; 188 return (0); 189 } 190 191 /* 192 * Open the named file for inclusion at the current point. Returns 0 on 193 * success (file opened and previous state pushed), nonzero on failure 194 * (fopen failed, complaint made). The `ateof' parameter controls the 195 * token to be inserted at the end of the include file (i.e. ENDFILE). 196 * If ateof == 0 then nothing is inserted. 197 */ 198 int 199 include(const char *fname, int ateof) 200 { 201 FILE *fp; 202 struct incl *in; 203 char *s; 204 static int havedirs; 205 206 if (havedirs == 0) { 207 havedirs = 1; 208 setupdirs(); 209 } 210 211 /* Kludge until files.* files are fixed. */ 212 if (strncmp(fname, "../../../", 9) == 0) 213 fname += 9; 214 215 s = (*fname == '/') ? strdup(fname) : sourcepath(fname); 216 if ((fp = fopen(s, "r")) == NULL) { 217 error("cannot open %s for reading: %s\n", s, strerror(errno)); 218 free(s); 219 return (-1); 220 } 221 in = emalloc(sizeof *in); 222 in->in_prev = incl; 223 in->in_buf = YY_CURRENT_BUFFER; 224 in->in_fname = yyfile; 225 in->in_lineno = yyline; 226 in->in_ateof = ateof; 227 incl = in; 228 yy_switch_to_buffer(yy_create_buffer(fp, YY_BUF_SIZE)); 229 yyfile = intern(s); 230 yyline = 1; 231 free(s); 232 return (0); 233 } 234 235 /* 236 * Terminate the most recent inclusion. 237 */ 238 static int 239 endinclude() 240 { 241 struct incl *in; 242 int ateof; 243 244 if ((in = incl) == NULL) 245 panic("endinclude"); 246 incl = in->in_prev; 247 lastfile = yyfile; 248 yy_delete_buffer(YY_CURRENT_BUFFER); 249 (void)fclose(yyin); 250 yy_switch_to_buffer(in->in_buf); 251 yyfile = in->in_fname; 252 yyline = in->in_lineno; 253 ateof = in->in_ateof; 254 free(in); 255 256 return (ateof); 257 } 258 259 /* 260 * Return the current line number. If yacc has looked ahead and caused 261 * us to consume a newline, we have to subtract one. yychar is yacc's 262 * token lookahead, so we can tell. 263 */ 264 int 265 currentline() 266 { 267 extern int yychar; 268 269 return (yyline - (yychar == '\n')); 270 } 271