lang.l revision 136429
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: head/usr.sbin/config/lang.l 136429 2004-10-12 13:21:44Z phk $ 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 */ 45struct 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}; 52static struct incl *inclp; 53static const char *lastfile; 54 55/* 56 * Key word table 57 */ 58 59struct 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 85static int endinclude(void); 86int include(const char *, int); 87int kw_lookup(char *); 88unsigned int octal(const char *); 89unsigned int hex(const char *); 90int yyerror(const char *); 91 92%} 93ID [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 } 1250[0-7]* { 126 yylval.val = octal(yytext); 127 return NUMBER; 128 } 1290x[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 172int 173kw_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 187unsigned int 188octal(const char *str) 189{ 190 unsigned int num; 191 192 (void) sscanf(str, "%o", &num); 193 return num; 194} 195 196unsigned int 197hex(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 */ 213int 214include(const char *fname, int ateof) 215{ 216 FILE *fp; 217 struct incl *in; 218 219 fp = fopen(fname, "r"); 220 if (fp == NULL) { 221 yyerror("cannot open file"); 222 return (-1); 223 } 224 in = malloc(sizeof(*in)); 225 assert(in != NULL); 226 in->in_prev = inclp; 227 in->in_buf = YY_CURRENT_BUFFER; 228 in->in_fname = yyfile; 229 in->in_lineno = yyline; 230 in->in_ateof = ateof; 231 inclp = in; 232 yy_switch_to_buffer(yy_create_buffer(fp, YY_BUF_SIZE)); 233 yyfile = fname; 234 yyline = 0; 235 return (0); 236} 237 238/* 239 * Terminate the most recent inclusion. 240 */ 241static int 242endinclude() 243{ 244 struct incl *in; 245 int ateof; 246 247 in = inclp; 248 assert(in != NULL); 249 inclp = in->in_prev; 250 lastfile = yyfile; 251 yy_delete_buffer(YY_CURRENT_BUFFER); 252 (void)fclose(yyin); 253 yy_switch_to_buffer(in->in_buf); 254 yyfile = in->in_fname; 255 yyline = in->in_lineno; 256 ateof = in->in_ateof; 257 free(in); 258 259 return (ateof); 260} 261