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Add interface for running filters (please comment!), avoid bison warnings
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@ -22,20 +22,17 @@ CF_DECLS
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CF_KEYWORDS(FUNCTION, FILTER, PRINTDEBUG, INT, PRINT)
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%type <x> term
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%type <x> cmds
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CF_GRAMMAR
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program: /* EMPTY */
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| program function
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;
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CF_ADDTO(conf, function)
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function:
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FUNCTION SYM '(' ')' '{' term '}' {
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FUNCTION SYM '(' ')' '{' cmds '}' {
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extern struct f_instruction *last_func;
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if ($2->class != SYM_VOID) cf_error("Symbol already defined" );
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$2->class = SYM_FUNCTION;
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$2->aux = $6;
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$2->def = $6;
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last_func = $6;
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printf("Hmm, we've got one function here\n");
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}
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@ -43,23 +40,34 @@ function:
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CF_ADDTO(conf, filter)
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filter:
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FILTER SYM '{' term '}' {
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FILTER SYM '{' cmds '}' {
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if ($2->class != SYM_VOID) cf_error("Symbol already defined" );
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$2->class = SYM_FILTER;
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$2->aux = $4;
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$2->def = $4;
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printf( "We have new filter defined (%s)\n", $2->name )
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}
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;
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/* Programs */
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term: /* EMPTY */ { $$ = NULL; }
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| term ';' term {
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$$ = cfg_alloc(sizeof(struct f_instruction));
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printf( "We've got statement here\n" );
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$$->code = ',';
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$$->arg1 = $1;
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$$->arg2 = $3;
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cmds:
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term {
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if ($1) {
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$1->next = NULL;
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$$ = $1;
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} else $$ = NULL;
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}
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| term ';' cmds {
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if ($1) {
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$1->next = $3;
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$$ = $1;
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} else $$ = $3;
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}
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;
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term:
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/* EMPTY */ {
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$$ = NULL;
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}
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| INT SYM {
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if ($2->class != SYM_VOID) cf_error("Symbol already defined, can not use as variable\n" );
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@ -68,7 +76,7 @@ term: /* EMPTY */ { $$ = NULL; }
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$$ = NULL;
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}
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| SYM '=' expr {
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$$ = cfg_alloc(sizeof(struct f_instruction));
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$$ = f_new_inst();
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printf( "Ook, we'll set value\n" );
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if ($1->class != SYM_VARIABLE_INT)
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cf_error( "You may only set variables\n" );
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@ -77,14 +85,14 @@ term: /* EMPTY */ { $$ = NULL; }
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$$->arg2 = $3;
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}
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| PRINT '(' SYM ')' {
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$$ = cfg_alloc(sizeof(struct f_instruction));
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$$ = f_new_inst();
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printf( "Ook, we'll print something\n" );
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$$->code = 'p';
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$$->arg1 = $3;
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$$->arg2 = NULL;
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}
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| PRINTDEBUG {
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$$ = cfg_alloc(sizeof(struct f_instruction));
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$$ = f_new_inst();
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$$->code = 'D';
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$$->arg1 = $$->arg2 = NULL;
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}
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@ -28,7 +28,7 @@ interpret(struct f_instruction *what)
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{
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struct symbol *sym;
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if (!what)
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return 0;
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return;
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switch(what->code) {
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case ',':
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interpret(what->arg1);
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@ -36,7 +36,7 @@ interpret(struct f_instruction *what)
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break;
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case '=':
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sym = what->arg1;
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sym->aux = what->arg2;
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sym->aux = (int) what->arg2;
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break;
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case 'p':
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sym = what->arg1;
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@ -52,7 +52,11 @@ interpret(struct f_instruction *what)
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case 'D':
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printf( "DEBUGGING PRINT\n" );
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break;
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case '0':
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printf( "No operation\n" );
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break;
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}
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interpret(what->next);
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}
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void
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@ -65,3 +69,24 @@ filters_postconfig(void)
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}
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}
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struct f_instruction *
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f_new_inst(void)
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{
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struct f_instruction * ret;
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ret = cfg_alloc(sizeof(struct f_instruction));
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ret->code = 0;
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ret->arg1 = ret->arg2 = ret->next = NULL;
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return ret;
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}
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int
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f_run(struct symbol *filter, struct rte *rtein, struct rte **rteout)
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{
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struct f_instruction *inst;
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debug( "Running filter `%s'...", filter->name );
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inst = filter->def;
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interpret(inst);
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debug( "done\n" );
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return F_ACCEPT;
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}
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@ -14,10 +14,16 @@
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/* Lexer */
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struct f_instruction {
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struct f_instruction *next; /* Structure is 16 bytes, anyway */
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int code;
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void *arg1, *arg2;
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};
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void filters_postconfig(void);
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struct f_instruction *f_new_inst(void);
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#define F_ACCEPT 1
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#define F_REJECT 2
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#define F_MODIFY 3
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#endif
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