3 * $Id: lexer.l,v 1.5 2003/10/12 00:29:10 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 1.5 2003/10/12 00:29:10 mdw
33 * Missed an old include...
35 * Revision 1.4 1999/05/04 16:17:26 mdw
36 * Change to header file name for parser. See log for `parse.h' for
39 * Revision 1.3 1998/01/12 16:46:07 mdw
42 * Revision 1.2 1997/08/04 10:24:23 mdw
43 * Sources placed under CVS control.
45 * Revision 1.1 1997/07/21 13:47:48 mdw
50 /*----- Declarations section ----------------------------------------------*/
52 /* --- Header files --- */
64 /* --- Start conditions --- */
70 /* --- A handy static buffer --- */
72 static char lex__buff[4096];
73 static char *lex__ptr;
75 /* --- Line number --- */
81 /*---- Main scanner definition -------------------------------------------*/
83 /* --- Comments --- */
85 <INITIAL,s_KEYWORD,s_NORMAL>{
88 /* --- Whitespace --- */
94 /* --- Keywords --- */
97 user BEGIN(s_NORMAL); return (USER);
98 command BEGIN(s_NORMAL); return (COMMAND);
99 host BEGIN(s_NORMAL); return (HOST);
100 allow BEGIN(s_NORMAL); return (ALLOW);
101 port BEGIN(s_NORMAL); return (PORT);
102 keyfile BEGIN(s_NORMAL); return (KEYFILE);
103 . BEGIN(s_NORMAL); return (BADTOKEN);
105 /* --- Other sorts of tokens --- */
108 [0-9]* yylval.i = atoi(yytext); return (INT);
109 [a-zA-Z_][a-zA-Z_0-9]* yylval.s = yytext; return (WORD);
110 \" BEGIN(s_STRING); lex__ptr = lex__buff;
111 ";" BEGIN(s_KEYWORD); return (';');
113 . return (yytext[0]);
116 /* --- Strings and things --- *
118 * Be a little careful about buffer overflows here.
124 lex__buff + sizeof(lex__buff) - 8) {
125 moan("string too long at line %i",
128 yylval.s = lex__buff;
132 *lex__ptr++ = yytext[1];
136 yylval.s = lex__buff;
142 moan("missing `\"', inserted at line %i",
146 yylval.s = lex__buff;
152 lex__buff + sizeof(lex__buff) - 8) {
153 moan("string too long at line %i",
156 yylval.s = lex__buff;
160 *lex__ptr++ = yytext[0];
166 /*----- Support routines --------------------------------------------------*/
168 /* --- @lexer_scan@ --- *
170 * Arguments: @FILE *fp@ = pointer to a stream object to scan
174 * Use: Initialises the scanner ready to parse from the given
178 void lexer_scan(FILE *fp)
185 /*----- That's all, folks -------------------------------------------------*/