lang.l revision 110897
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 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the University of 17 * California, Berkeley and its contributors. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)lang.l 8.1 (Berkeley) 6/6/93 35 * $FreeBSD: head/usr.sbin/config/lang.l 110897 2003-02-15 02:39:13Z ru $ 36 */ 37 38#include <assert.h> 39#include <ctype.h> 40#include <string.h> 41#include "y.tab.h" 42#include "config.h" 43 44#define YY_NO_UNPUT 45 46/* 47 * Data for returning to previous files from include files. 48 */ 49struct incl { 50 struct incl *in_prev; /* previous includes in effect, if any */ 51 YY_BUFFER_STATE in_buf; /* previous lex state */ 52 const char *in_fname; /* previous file name */ 53 int in_lineno; /* previous line number */ 54 int in_ateof; /* token to insert at EOF */ 55}; 56static struct incl *inclp; 57static const char *lastfile; 58 59/* 60 * Key word table 61 */ 62 63struct kt { 64 const char *kt_name; 65 int kt_val; 66} key_words[] = { 67 { "config", CONFIG }, 68 { "cpu", CPU }, 69 { "device", DEVICE }, 70 { "env", ENV }, 71 { "hints", HINTS }, 72 { "ident", IDENT }, 73 { "machine", ARCH }, /* MACHINE is defined in /sys/param.h */ 74 { "makeoptions", MAKEOPTIONS }, 75 { "maxusers", MAXUSERS }, 76 { "nodevice", NODEVICE }, 77 { "profile", PROFILE }, 78 { "option", OPTIONS }, 79 { "options", OPTIONS }, 80 { "include", INCLUDE }, 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%} 93WORD [A-Za-z_][-A-Za-z_]* 94ID [A-Za-z_][-A-Za-z_0-9]* 95%START NONUM TOEOL 96%% 97<NONUM>{WORD} { 98 int i; 99 100 BEGIN 0; 101 if ((i = kw_lookup(yytext)) == -1) 102 { 103 yylval.str = strdup(yytext); 104 return ID; 105 } 106 return i; 107 } 108<INITIAL>{WORD}/[0-9]* { 109 int i; 110 111 if ((i = kw_lookup(yytext)) == -1) 112 REJECT; 113 if (i == DEVICE || i == NODEVICE) 114 BEGIN NONUM; 115 return i; 116 } 117<INITIAL>{ID} { 118 BEGIN 0; 119 yylval.str = strdup(yytext); 120 return ID; 121 } 122\\\"[^"]+\\\" { 123 BEGIN 0; 124 yytext[yyleng-2] = '"'; 125 yytext[yyleng-1] = '\0'; 126 yylval.str = strdup(yytext + 1); 127 return ID; 128 } 129\"[^"]+\" { 130 BEGIN 0; 131 yytext[yyleng-1] = '\0'; 132 yylval.str = strdup(yytext + 1); 133 return ID; 134 } 135<TOEOL>[^# \t\n]* { 136 BEGIN 0; 137 yylval.str = strdup(yytext); 138 return ID; 139 } 1400[0-7]* { 141 yylval.val = octal(yytext); 142 return NUMBER; 143 } 1440x[0-9a-fA-F]+ { 145 yylval.val = hex(yytext); 146 return NUMBER; 147 } 148-?[1-9][0-9]* { 149 yylval.val = atoi(yytext); 150 return NUMBER; 151 } 152"?" { 153 yylval.val = -1; 154 return NUMBER; 155 } 156\n/[ \t] { 157 yyline++; 158 } 159\n { 160 yyline++; 161 return SEMICOLON; 162 } 163#.* { /* Ignored (comment) */; } 164[ \t\f]* { /* Ignored (white space) */; } 165";" { return SEMICOLON; } 166"," { return COMMA; } 167"=" { BEGIN TOEOL; return EQUALS; } 168<<EOF>> { 169 int tok; 170 171 if (inclp == NULL) 172 return YY_NULL; 173 tok = endinclude(); 174 if (tok != 0) 175 return tok; 176 /* otherwise continue scanning */ 177 } 178. { return yytext[0]; } 179 180%% 181/* 182 * kw_lookup 183 * Look up a string in the keyword table. Returns a -1 if the 184 * string is not a keyword otherwise it returns the keyword number 185 */ 186 187int 188kw_lookup(char *word) 189{ 190 struct kt *kp; 191 192 for (kp = key_words; kp->kt_name != 0; kp++) 193 if (eq(word, kp->kt_name)) 194 return kp->kt_val; 195 return -1; 196} 197 198/* 199 * Number conversion routines 200 */ 201 202unsigned int 203octal(const char *str) 204{ 205 unsigned int num; 206 207 (void) sscanf(str, "%o", &num); 208 return num; 209} 210 211unsigned int 212hex(const char *str) 213{ 214 unsigned int num; 215 216 (void) sscanf(str+2, "%x", &num); 217 return num; 218} 219 220 221/* 222 * Open the named file for inclusion at the current point. Returns 0 on 223 * success (file opened and previous state pushed), nonzero on failure 224 * (fopen failed, complaint made). The `ateof' parameter controls the 225 * token to be inserted at the end of the include file. If ateof == 0, 226 * then nothing is inserted. 227 */ 228int 229include(const char *fname, int ateof) 230{ 231 FILE *fp; 232 struct incl *in; 233 234 fp = fopen(fname, "r"); 235 if (fp == NULL) { 236 yyerror("cannot open file"); 237 return (-1); 238 } 239 in = malloc(sizeof(*in)); 240 assert(in != NULL); 241 in->in_prev = inclp; 242 in->in_buf = YY_CURRENT_BUFFER; 243 in->in_fname = yyfile; 244 in->in_lineno = yyline; 245 in->in_ateof = ateof; 246 inclp = in; 247 yy_switch_to_buffer(yy_create_buffer(fp, YY_BUF_SIZE)); 248 yyfile = fname; 249 yyline = 0; 250 return (0); 251} 252 253/* 254 * Terminate the most recent inclusion. 255 */ 256static int 257endinclude() 258{ 259 struct incl *in; 260 int ateof; 261 262 in = inclp; 263 assert(in != NULL); 264 inclp = in->in_prev; 265 lastfile = yyfile; 266 yy_delete_buffer(YY_CURRENT_BUFFER); 267 (void)fclose(yyin); 268 yy_switch_to_buffer(in->in_buf); 269 yyfile = in->in_fname; 270 yyline = in->in_lineno; 271 ateof = in->in_ateof; 272 free(in); 273 274 return (ateof); 275} 276