1/* Common parts between scan-code.l, scan-gram.l, and scan-skel.l.
2
3   Copyright (C) 2006, 2009-2012 Free Software Foundation, Inc.
4
5   This file is part of Bison, the GNU Compiler Compiler.
6
7   This program is free software: you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation, either version 3 of the License, or
10   (at your option) any later version.
11
12   This program is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   GNU General Public License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
19
20#ifndef FLEX_PREFIX
21# error "FLEX_PREFIX not defined"
22#endif
23
24/* Flex full version as a number.  */
25#define FLEX_VERSION                    \
26  ((YY_FLEX_MAJOR_VERSION) * 1000000    \
27   + (YY_FLEX_MINOR_VERSION) * 1000     \
28   + (YY_FLEX_SUBMINOR_VERSION))
29
30/* Pacify "gcc -Wmissing-prototypes" when flex 2.5.31 is used.  */
31# if FLEX_VERSION <= 2005031
32int   FLEX_PREFIX (get_lineno) (void);
33FILE *FLEX_PREFIX (get_in) (void);
34FILE *FLEX_PREFIX (get_out) (void);
35int   FLEX_PREFIX (get_leng) (void);
36char *FLEX_PREFIX (get_text) (void);
37void  FLEX_PREFIX (set_lineno) (int);
38void  FLEX_PREFIX (set_in) (FILE *);
39void  FLEX_PREFIX (set_out) (FILE *);
40int   FLEX_PREFIX (get_debug) (void);
41void  FLEX_PREFIX (set_debug) (int);
42int   FLEX_PREFIX (lex_destroy) (void);
43#endif
44
45#define last_string    FLEX_PREFIX (last_string)
46
47/* It seems to be a nice "feature" of Flex that one cannot use yytext,
48   yyleng etc. when a prefix is given, since there is no longer a
49   #define, but rather the token is actually changed in the output.
50   However, this is not true for Flex 2.5.4.  */
51#ifndef yyleng
52# define yyleng  FLEX_PREFIX (leng)
53#endif
54#ifndef yytext
55# define yytext  FLEX_PREFIX (text)
56#endif
57
58/* Non-reentrant scanners generated by Flex 2.5.9 and later (and some earlier
59   versions according to the Flex manual) leak memory if yylex_destroy is not
60   invoked.  However, yylex_destroy is not defined before Flex 2.5.9, so give
61   an implementation here that at least appears to work with Flex 2.5.4.  */
62#if FLEX_VERSION <= 2005009
63# define yylex_destroy() yy_delete_buffer (YY_CURRENT_BUFFER)
64#endif
65
66/* OBSTACK_FOR_STRING -- Used to store all the characters that we need to
67   keep (to construct ID, STRINGS etc.).  Use the following macros to
68   use it.
69
70   Use STRING_GROW to append what has just been matched, and
71   STRING_FINISH to end the string (it puts the ending 0).
72   STRING_FINISH also stores this string in LAST_STRING, which can be
73   used, and which is used by STRING_FREE to free the last string.  */
74
75#ifndef FLEX_NO_OBSTACK
76
77static struct obstack obstack_for_string;
78
79# define STRING_GROW   \
80  obstack_grow (&obstack_for_string, yytext, yyleng)
81
82# define STRING_FINISH					\
83  do {							\
84    obstack_1grow (&obstack_for_string, '\0');		\
85    last_string = obstack_finish (&obstack_for_string);	\
86  } while (0)
87
88# define STRING_FREE \
89  obstack_free (&obstack_for_string, last_string)
90
91#endif
92