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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: lexer.l,v 1.7 2004/04/08 01:36:20 mdw Exp $ |
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4 | * |
5 | * Lexical analyser for `become.conf' files |
6 | * |
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7 | * (c) 1998 EBI |
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8 | */ |
9 | |
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10 | /*----- Licensing notice --------------------------------------------------* |
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11 | * |
12 | * This file is part of `become' |
13 | * |
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. |
18 | * |
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. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
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25 | * along with `become'; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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27 | */ |
28 | |
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29 | /*----- Declarations section ----------------------------------------------*/ |
30 | |
31 | /* --- Header files --- */ |
32 | |
33 | %{ |
34 | #include <stdio.h> |
35 | #include <stdlib.h> |
36 | #include <string.h> |
37 | |
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38 | #include <mLib/report.h> |
39 | |
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40 | #include "become.h" |
41 | #include "lexer.h" |
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42 | #include "parse.h" |
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43 | %} |
44 | |
45 | /* --- Start conditions --- */ |
46 | |
47 | %x s_KEYWORD |
48 | %x s_NORMAL |
49 | %x s_STRING |
50 | |
51 | /* --- A handy static buffer --- */ |
52 | |
53 | static char lex__buff[4096]; |
54 | static char *lex__ptr; |
55 | |
56 | /* --- Line number --- */ |
57 | |
58 | int lex_line; |
59 | |
60 | %% |
61 | |
62 | /*---- Main scanner definition -------------------------------------------*/ |
63 | |
64 | /* --- Comments --- */ |
65 | |
66 | <INITIAL,s_KEYWORD,s_NORMAL>{ |
67 | "#".*\n lex_line++; |
68 | |
69 | /* --- Whitespace --- */ |
70 | |
71 | [ \t] /* munch */ |
72 | \n lex_line++; |
73 | } |
74 | |
75 | /* --- Keywords --- */ |
76 | |
77 | <INITIAL,s_KEYWORD>{ |
78 | user BEGIN(s_NORMAL); return (USER); |
79 | command BEGIN(s_NORMAL); return (COMMAND); |
80 | host BEGIN(s_NORMAL); return (HOST); |
81 | allow BEGIN(s_NORMAL); return (ALLOW); |
82 | port BEGIN(s_NORMAL); return (PORT); |
83 | keyfile BEGIN(s_NORMAL); return (KEYFILE); |
84 | . BEGIN(s_NORMAL); return (BADTOKEN); |
85 | } |
86 | /* --- Other sorts of tokens --- */ |
87 | |
88 | <s_NORMAL>{ |
89 | [0-9]* yylval.i = atoi(yytext); return (INT); |
90 | [a-zA-Z_][a-zA-Z_0-9]* yylval.s = yytext; return (WORD); |
91 | \" BEGIN(s_STRING); lex__ptr = lex__buff; |
92 | ";" BEGIN(s_KEYWORD); return (';'); |
93 | "->" return (ARROW); |
94 | . return (yytext[0]); |
95 | } |
96 | |
97 | /* --- Strings and things --- * |
98 | * |
99 | * Be a little careful about buffer overflows here. |
100 | */ |
101 | |
102 | <s_STRING>{ |
103 | \\. { |
104 | if (lex__ptr > |
105 | lex__buff + sizeof(lex__buff) - 8) { |
106 | moan("string too long at line %i", |
107 | lex_line); |
108 | *lex__ptr++ = 0; |
109 | yylval.s = lex__buff; |
110 | BEGIN(s_NORMAL); |
111 | return (STRING); |
112 | } |
113 | *lex__ptr++ = yytext[1]; |
114 | } |
115 | \" { |
116 | *lex__ptr++ = 0; |
117 | yylval.s = lex__buff; |
118 | BEGIN(s_NORMAL); |
119 | return (STRING); |
120 | } |
121 | \n | |
122 | <<EOF>> { |
123 | moan("missing `\"', inserted at line %i", |
124 | lex_line); |
125 | lex_line++; |
126 | *lex__ptr++ = 0; |
127 | yylval.s = lex__buff; |
128 | BEGIN(s_NORMAL); |
129 | return (STRING); |
130 | } |
131 | . { |
132 | if (lex__ptr > |
133 | lex__buff + sizeof(lex__buff) - 8) { |
134 | moan("string too long at line %i", |
135 | lex_line); |
136 | *lex__ptr++ = 0; |
137 | yylval.s = lex__buff; |
138 | BEGIN(s_NORMAL); |
139 | return (STRING); |
140 | } |
141 | *lex__ptr++ = yytext[0]; |
142 | } |
143 | } |
144 | |
145 | %% |
146 | |
147 | /*----- Support routines --------------------------------------------------*/ |
148 | |
149 | /* --- @lexer_scan@ --- * |
150 | * |
151 | * Arguments: @FILE *fp@ = pointer to a stream object to scan |
152 | * |
153 | * Returns: --- |
154 | * |
155 | * Use: Initialises the scanner ready to parse from the given |
156 | * stream. |
157 | */ |
158 | |
159 | void lexer_scan(FILE *fp) |
160 | { |
161 | yyin = fp; |
162 | lex_line = 1; |
163 | BEGIN(INITIAL); |
164 | } |
165 | |
166 | /*----- That's all, folks -------------------------------------------------*/ |