From b9d70dc84e488212328103438bdf4e369c7d27a1 Mon Sep 17 00:00:00 2001
From: Pavel Machek <pavel@ucw.cz>
Date: Fri, 15 Jan 1999 16:49:17 +0000
Subject: Filters, second try. This time they have their own directory.

---
 filter/Makefile |   5 +++
 filter/config.Y | 100 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 filter/f-util.c |  67 +++++++++++++++++++++++++++++++++++++
 filter/filter.h |  21 ++++++++++++
 4 files changed, 193 insertions(+)
 create mode 100644 filter/Makefile
 create mode 100644 filter/config.Y
 create mode 100644 filter/f-util.c
 create mode 100644 filter/filter.h

(limited to 'filter')

diff --git a/filter/Makefile b/filter/Makefile
new file mode 100644
index 0000000..1e7fb68
--- /dev/null
+++ b/filter/Makefile
@@ -0,0 +1,5 @@
+source=f-util.c
+root-rel=../
+dir-name=filter
+
+include ../Rules
diff --git a/filter/config.Y b/filter/config.Y
new file mode 100644
index 0000000..265463d
--- /dev/null
+++ b/filter/config.Y
@@ -0,0 +1,100 @@
+/*
+ *	BIRD - filters
+ *
+ *	Copyright 1998 Pavel Machek
+ *
+ *	Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+CF_HDR
+
+#include "nest/bird.h"
+#include "filter/filter.h"
+#include "lib/resource.h"
+#include "lib/socket.h"
+#include "lib/timer.h"
+#include "nest/protocol.h"
+#include "nest/iface.h"
+#include "nest/route.h"
+
+CF_DECLS
+
+CF_KEYWORDS(FUNCTION, FILTER, PRINTDEBUG, INT, PRINT)
+
+%type <x> expr
+
+CF_GRAMMAR
+
+config:
+   program { 
+     printf( "Wow, we have full program\n" );
+     return 0;
+   }
+ ;
+
+program: /* EMPTY */
+ | program function
+ ;
+
+CF_ADDTO(conf, function)
+function:
+   FUNCTION SYM '(' ')' '{' expr '}' { 
+     extern struct f_instruction *last_func;
+     if ($2->class != SYM_VOID) cf_error("Symbol already defined" );
+     $2->class = SYM_FUNCTION;
+     $2->aux = $6;
+     last_func = $6;
+     printf("Hmm, we've got one function here\n"); 
+   }
+ ;
+
+CF_ADDTO(conf, filter)
+filter:
+   FILTER SYM '{' expr '}' {
+     if ($2->class != SYM_VOID) cf_error("Symbol already defined" );
+     $2->class = SYM_FILTER;
+     $2->aux = $4;
+     printf( "We have new filter defined (%s)\n", $2->name )
+   }
+ ;
+
+/* Programs */
+
+expr: /* EMPTY */ { $$ = NULL; }
+ | expr ';' expr { 
+     $$ = cfg_alloc(sizeof(struct f_instruction));
+     printf( "We've got statement here\n" );
+     $$->code = ',';
+     $$->arg1 = $1;
+     $$->arg2 = $3;
+   }
+ | INT SYM ';' {
+     if ($2->class != SYM_VOID) cf_error("Symbol already defined, can not use as variable\n" );
+     $2->class = SYM_VARIABLE_INT;
+     printf( "New variable\n" );
+     $$ = NULL;
+   }
+ | SYM '=' cexpr {
+     $$ = cfg_alloc(sizeof(struct f_instruction));
+     printf( "Ook, we'll set value\n" );
+     if ($1->class != SYM_VARIABLE_INT)
+       cf_error( "You may only set variables\n" );
+     $$->code = '=';
+     $$->arg1 = $1;
+     $$->arg2 = $3;
+   }
+ | PRINT '(' SYM ')' {
+     $$ = cfg_alloc(sizeof(struct f_instruction));
+     printf( "Ook, we'll print something\n" );
+     $$->code = 'p';
+     $$->arg1 = $3;
+     $$->arg2 = NULL;
+   }
+ | PRINTDEBUG {
+     $$ = cfg_alloc(sizeof(struct f_instruction));
+     $$->code = 'D';
+     $$->arg1 = $$->arg2 = NULL;
+ }
+ ;
+
+CF_END
diff --git a/filter/f-util.c b/filter/f-util.c
new file mode 100644
index 0000000..df6babb
--- /dev/null
+++ b/filter/f-util.c
@@ -0,0 +1,67 @@
+/*
+ *	Filters: utility functions
+ *
+ *	Copyright 1998 Pavel Machek <pavel@ucw.cz>
+ *
+ *	Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/signal.h>
+
+#include "nest/bird.h"
+#include "lib/lists.h"
+#include "lib/resource.h"
+#include "lib/socket.h"
+#include "nest/route.h"
+#include "nest/protocol.h"
+#include "nest/iface.h"
+#include "conf/conf.h"
+#include "filter/filter.h"
+
+struct f_instruction *last_func = NULL;
+
+static void
+interpret(struct f_instruction *what)
+{
+  struct symbol *sym;
+  if (!what)
+    return 0;
+  switch(what->code) {
+  case ',':
+    interpret(what->arg1);
+    interpret(what->arg2);
+    break;
+  case '=':
+    sym = what->arg1;
+    sym->aux = what->arg2;
+    break;
+  case 'p':
+    sym = what->arg1;
+    switch(sym->class) {
+    case SYM_VARIABLE_INT: 
+      printf( "Printing: %d\n", sym->aux );
+      break;
+    default:
+      printf( "Unknown type passed to print\n" );
+      break;
+    }
+    break;
+  case 'D':
+    printf( "DEBUGGING PRINT\n" );
+    break;
+  }
+}
+
+void
+filters_init(void)
+{
+  if (!last_func)
+    printf( "No function defined\n" );
+  else {
+    interpret(last_func);
+  }
+} 
+
diff --git a/filter/filter.h b/filter/filter.h
new file mode 100644
index 0000000..499be0a
--- /dev/null
+++ b/filter/filter.h
@@ -0,0 +1,21 @@
+/*
+ *	BIRD Internet Routing Daemon -- Configuration File Handling
+ *
+ *	(c) 1998 Martin Mares <mj@ucw.cz>
+ *
+ *	Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#ifndef _BIRD_FILT_H_
+#define _BIRD_FILT_H_
+
+#include "lib/resource.h"
+
+/* Lexer */
+
+struct f_instruction {
+  int code;
+  void *arg1, *arg2;
+};
+
+#endif
-- 
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