3 * $Id: lexer.l,v 1.3 1998/01/12 16:46:07 mdw Exp $
5 * Lexical analyser for `become.conf' files
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of `become'
14 * `Become' is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * `Become' is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with `become'; if not, write to the Free Software Foundation,
26 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 /*----- Revision history --------------------------------------------------*
32 * Revision 1.3 1998/01/12 16:46:07 mdw
35 * Revision 1.2 1997/08/04 10:24:23 mdw
36 * Sources placed under CVS control.
38 * Revision 1.1 1997/07/21 13:47:48 mdw
43 /*----- Declarations section ----------------------------------------------*/
45 /* --- Header files --- */
58 /* --- Start conditions --- */
64 /* --- A handy static buffer --- */
66 static char lex__buff[4096];
67 static char *lex__ptr;
69 /* --- Line number --- */
75 /*---- Main scanner definition -------------------------------------------*/
77 /* --- Comments --- */
79 <INITIAL,s_KEYWORD,s_NORMAL>{
82 /* --- Whitespace --- */
88 /* --- Keywords --- */
91 user BEGIN(s_NORMAL); return (USER);
92 command BEGIN(s_NORMAL); return (COMMAND);
93 host BEGIN(s_NORMAL); return (HOST);
94 allow BEGIN(s_NORMAL); return (ALLOW);
95 port BEGIN(s_NORMAL); return (PORT);
96 keyfile BEGIN(s_NORMAL); return (KEYFILE);
97 . BEGIN(s_NORMAL); return (BADTOKEN);
99 /* --- Other sorts of tokens --- */
102 [0-9]* yylval.i = atoi(yytext); return (INT);
103 [a-zA-Z_][a-zA-Z_0-9]* yylval.s = yytext; return (WORD);
104 \" BEGIN(s_STRING); lex__ptr = lex__buff;
105 ";" BEGIN(s_KEYWORD); return (';');
107 . return (yytext[0]);
110 /* --- Strings and things --- *
112 * Be a little careful about buffer overflows here.
118 lex__buff + sizeof(lex__buff) - 8) {
119 moan("string too long at line %i",
122 yylval.s = lex__buff;
126 *lex__ptr++ = yytext[1];
130 yylval.s = lex__buff;
136 moan("missing `\"', inserted at line %i",
140 yylval.s = lex__buff;
146 lex__buff + sizeof(lex__buff) - 8) {
147 moan("string too long at line %i",
150 yylval.s = lex__buff;
154 *lex__ptr++ = yytext[0];
160 /*----- Support routines --------------------------------------------------*/
162 /* --- @lexer_scan@ --- *
164 * Arguments: @FILE *fp@ = pointer to a stream object to scan
168 * Use: Initialises the scanner ready to parse from the given
172 void lexer_scan(FILE *fp)
179 /*----- That's all, folks -------------------------------------------------*/