1 /*
2 * This file is part of flex.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
21 * PURPOSE.
22 */
23
24 %{
25 /* A scanner file to build "scanner.c".
26 Input language is any text.
27 "#include <filename>" causes a buffer switch.
28 */
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include "config.h"
32 %}
33
34 %option 8bit outfile="scanner.c" prefix="test"
35 %option nounput nomain noyywrap
36 %option warn
37
38 %x GET_FILENAME
39 %{
40
41 #define MAX_INCLUDE_DEPTH 10
42 YY_BUFFER_STATE include_stack[MAX_INCLUDE_DEPTH];
43 int include_stack_ptr = 0;
44 %}
45 %%
46
47 <INITIAL>{
48 ^"#include"[[:blank:]]+"<" { BEGIN(GET_FILENAME); }
49 .|\n { ECHO; }
50 }
51
52 <GET_FILENAME>{
53 [[:alnum:]_.-]+> {
54 /* recurse */
55 yytext[yyleng-1]='\0';
56 include_stack[include_stack_ptr++] = YY_CURRENT_BUFFER;
57 if((yyin=fopen(yytext,"r"))==NULL) {
58 fprintf(stderr,"*** Error: Could not open include file \"%s\".\n",yytext);
59 yyterminate();
60 }
61 yy_switch_to_buffer( yy_create_buffer( yyin, YY_BUF_SIZE ));
62 BEGIN(0);
63 }
64 .|\n {
65 fprintf(stderr,"Invalid input \"%s\".\n", yytext);
66 yyterminate();
67 }
68 }
69
70 <<EOF>> {
71 if ( --include_stack_ptr < 0 ) {
72 yyterminate();
73 }
74 else {
75 fclose(yyin);
76 yy_delete_buffer( YY_CURRENT_BUFFER );
77 yy_switch_to_buffer( include_stack[include_stack_ptr] );
78 }
79 }
80
81 %%
82
83 int main(int argc, char** argv);
84
85 int
main(int argc,char ** argv)86 main ( int argc, char** argv )
87 {
88 FILE * fp;
89 if( argc != 2 ) {
90 fprintf(stderr,"*** Error: Must specifiy one filename.\n");
91 exit(-1);
92 }
93 if((fp=fopen(argv[1],"r"))==NULL) {
94 fprintf(stderr,"*** Error: fopen(%s) failed.\n",argv[1]);
95 exit(-1);
96 }
97 yyin = fp;
98 yyout = stdout;
99 yylex();
100 printf("TEST RETURNING OK.\n");
101 return 0;
102 }
103