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 template scanner file to build "scanner.c".
26 Run as:
27 test-lineno-nr # report flex's yylineno
28 test-lineno-nr 1 # report count_newlines(stdin)
29 */
30
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include "config.h"
34
35 %}
36
37 %option 8bit prefix="test"
38 %option nounput nomain noyywrap noinput yylineno
39 %option warn
40
41 WORD [[:alpha:]]+
42 DIGIT [[:digit:]]
43
44 %%
45 /* The goal here is to test the yylineno processing by:
46 - providing some rules than CAN match newlines and
47 other rules that can NOT match newlines,
48 - matching several newlines in one rule,
49 - directly modifying yylineno.
50 */
51
52 "yylineno++" yylineno++;
53 "yylineno--" yylineno--;
54 [[:blank:]]+
55 {WORD}
56 {DIGIT}+(\n{DIGIT}+)*
57 \n
58 .
59 <<EOF>> { printf("%d\n", yylineno);
60 yyterminate();
61 }
62
63 %%
64
65 /* returns number of '\n' characters in input, plus one.
66 This is what flex does, essentially. */
67
68 static int
69 count_newlines (FILE* in)
70 {
71 int n=1,c;
72 while ((c=fgetc(in)) != EOF)
73 if( c == '\n')
74 n++;
75 return n;
76 }
77
78 int main ( int, char**);
79
80 int
main(argc,argv)81 main ( argc, argv )
82 int argc;
83 char** argv;
84 {
85 (void)argv;
86
87 if( argc > 1 )
88 printf("%d\n", count_newlines(stdin));
89
90 else{
91 yyin = stdin;
92 yyout = stdout;
93 yylex();
94 }
95 return 0;
96 }
97