doc: formatting changes

[bison.git] / src / flex-scanner.h

diff --git a/src/flex-scanner.h b/src/flex-scanner.h
index 3e16234c553605ad52e47c05e6e7985ff75589f3..997984117848430a48d54896ba8999f64b11f9a3 100644 (file)
--- a/src/flex-scanner.h
+++ b/src/flex-scanner.h
@@ -1,12 +1,12 @@
 /* Common parts between scan-code.l, scan-gram.l, and scan-skel.l.
 
-   Copyright (C) 2006 Free Software Foundation, Inc.
+   Copyright (C) 2006, 2009-2012 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
-   This program is free software; you can redistribute it and/or modify
+   This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2 of the License, or
+   the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
@@ -15,16 +15,26 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-   02110-1301  USA
-*/
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #ifndef FLEX_PREFIX
 # error "FLEX_PREFIX not defined"
 #endif
 
+/* Whether this version of Flex is (strictly) greater than
+   Major.Minor.Subminor.  */
+#define FLEX_VERSION_GT(Major, Minor, Subminor)                         \
+  (defined YY_FLEX_MAJOR_VERSION                                        \
+   && (Major < YY_FLEX_MAJOR_VERSION                                    \
+       || (Major == YY_FLEX_MAJOR_VERSION                               \
+           && (defined YY_FLEX_MINOR_VERSION                            \
+               && (Minor < YY_FLEX_MINOR_VERSION                        \
+                   || (Minor == YY_FLEX_MINOR_VERSION                   \
+                       && defined YY_FLEX_SUBMINOR_VERSION              \
+                       && Subminor < YY_FLEX_SUBMINOR_VERSION))))))
+
 /* Pacify "gcc -Wmissing-prototypes" when flex 2.5.31 is used.  */
+# if ! FLEX_VERSION_GT (2, 5, 31)
 int   FLEX_PREFIX (get_lineno) (void);
 FILE *FLEX_PREFIX (get_in) (void);
 FILE *FLEX_PREFIX (get_out) (void);
@@ -36,6 +46,7 @@ void  FLEX_PREFIX (set_out) (FILE *);
 int   FLEX_PREFIX (get_debug) (void);
 void  FLEX_PREFIX (set_debug) (int);
 int   FLEX_PREFIX (lex_destroy) (void);
+#endif
 
 #define last_string    FLEX_PREFIX (last_string)
 
@@ -50,6 +61,14 @@ int   FLEX_PREFIX (lex_destroy) (void);
 # define yytext  FLEX_PREFIX (text)
 #endif
 
+/* Non-reentrant scanners generated by Flex 2.5.9 and later (and some earlier
+   versions according to the Flex manual) leak memory if yylex_destroy is not
+   invoked.  However, yylex_destroy is not defined before Flex 2.5.9, so give
+   an implementation here that at least appears to work with Flex 2.5.4.  */
+#if ! FLEX_VERSION_GT (2, 5, 9)
+# define yylex_destroy() yy_delete_buffer (YY_CURRENT_BUFFER)
+#endif
+
 /* OBSTACK_FOR_STRING -- Used to store all the characters that we need to
    keep (to construct ID, STRINGS etc.).  Use the following macros to
    use it.
@@ -63,16 +82,16 @@ int   FLEX_PREFIX (lex_destroy) (void);
 
 static struct obstack obstack_for_string;
 
-#define STRING_GROW   \
+# define STRING_GROW   \
   obstack_grow (&obstack_for_string, yytext, yyleng)
 
-#define STRING_FINISH                                  \
+# define STRING_FINISH                                 \
   do {                                                 \
     obstack_1grow (&obstack_for_string, '\0');         \
     last_string = obstack_finish (&obstack_for_string);        \
   } while (0)
 
-#define STRING_FREE \
+# define STRING_FREE \
   obstack_free (&obstack_for_string, last_string)
 
 #endif