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Implemented two new symbol handling functions:

Browse source 
o  cf_define_symbol() -- it assigns a meaning to a symbol, bailing
     out if it already has one.
  o  cf_find_symbol() -- finds symbol by name and creates it if not found.

Also modified filter/config.Y to make use of the first function.
This commit is contained in:
Martin Mares 1999-05-17 20:06:19 +00:00
parent b23c5e0ff4
commit 4107df1d1b
3 changed files with 23 additions and 8 deletions
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15
conf/cf-lex.l
View file

@ -182,6 +182,12 @@ cf_find_sym(byte *c, unsigned int h0)
return s;
}
struct symbol *
cf_find_symbol(byte *c)
{
return cf_find_sym(c, cf_hash(c));
}
struct symbol *
cf_default_name(char *prefix, int *counter)
{
@ -198,6 +204,15 @@ cf_default_name(char *prefix, int *counter)
return s;
}
void
cf_define_symbol(struct symbol *sym, int type, void *def)
{
if (sym->class)
cf_error("Symbol already defined");
sym->class = type;
sym->def = def;
}
void
cf_lex_init(int flag)
{

5
conf/conf.h
View file

@ -17,6 +17,8 @@ struct config {
pool *pool; /* Pool the configuration is stored in */
linpool *mem; /* Linear pool containing configuration data */
list protos; /* Configured protocol instances (struct proto_config) */
list tables; /* Configured routing tables (struct rtable_config) */
struct rtable_config *master_rtc; /* Configuration of master routing table */
u32 router_id; /* Our Router ID */
char *err_msg; /* Parser error message */
int err_lino; /* Line containing error */
@ -60,6 +62,7 @@ struct symbol {
#define SYM_STAT 3 /* statement */
#define SYM_FUNCTION 5
#define SYM_FILTER 6
#define SYM_TABLE 7
#define SYM_VARIABLE 0x100 /* Reserved 0x100..0x1ff */
@ -68,7 +71,9 @@ extern int conf_lino;
void cf_lex_init_tables(void);
int cf_lex(void);
void cf_lex_init(int flag);
struct symbol *cf_find_symbol(byte *c);
struct symbol *cf_default_name(char *prefix, int *counter);
void cf_define_symbol(struct symbol *symbol, int type, void *def);
/* Parser */

11
filter/config.Y
View file

@ -40,9 +40,7 @@ CF_GRAMMAR
CF_ADDTO(conf, filter_def)
filter_def:
FILTER SYM filter_body {
if ($2->class != SYM_VOID) cf_error("Symbol already defined" );
$2->class = SYM_FILTER;
$2->def = $3;
cf_define_symbol($2, SYM_FILTER, $3);
$3->name = $2->name;
printf( "We have new filter defined (%s)\n", $2->name )
}
@ -67,8 +65,7 @@ type:
decls: /* EMPTY */
| type SYM ';' decls {
if ($2->class != SYM_VOID) cf_error("Symbol already defined, can not use as variable\n" );
$2->class = SYM_VARIABLE | $1;
cf_define_symbol($2, SYM_VARIABLE | $1, NULL);
printf( "New variable %s type %x\n", $2->name, $1 );
}
;
@ -104,9 +101,7 @@ CF_ADDTO(conf, function_def)
function_def:
FUNCTION SYM function_params function_body {
extern struct f_inst *startup_func;
if ($2->class != SYM_VOID) cf_error("Symbol already defined" );
$2->class = SYM_FUNCTION;
$2->def = $4;
cf_define_symbol($2, SYM_FUNCTION, $4);
if (!strcasecmp($2->name, "startup"))
startup_func = $4;
printf("Hmm, we've got one function here - %s\n", $2->name);