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/* fornax - distributed network
*
* by team teso
*
* symbol management include file
*/
#ifndef FNX_SYMBOL_H
#define FNX_SYMBOL_H
typedef struct sym_elem {
char *key; /* string of variable name */
char *value; /* NULL or string */
} sym_elem;
/* sym_subst
*
* substitute symbol information contained in string `str' using the global
* symbol table
*
* return newly allocated char pointer
*/
char * sym_subst (sym_elem **stab, char *str);
/* sym_elem_create
*
* symbol element constructor. create a new symbol element and set values
* to `key' and `value'
*
* return pointer to new sym_elem structure
*/
sym_elem * sym_elem_create (char *key, char *value);
/* sym_elem_free
*
* free symbol element pointed to by `se'
*
* return in any case
*/
void sym_elem_free (sym_elem *se);
/* sym_elem_add
*
* add a symbol element pointed to by `elem' to the symbol table pointed to
* by `tab'. if the table doesn't exist yet, just create it
*
* return in any case
*/
sym_elem ** sym_elem_add (sym_elem **tab, sym_elem *elem);
/* sym_remove
*
* remove a symbol with the key `key' from the symbol table pointed to by
* `tab'
*
* return in any case
*/
sym_elem ** sym_remove (sym_elem **tab, char *key);
/* sym_add
*
* create a new symbol table entry in the table `tab'. if `tab' is empty or
* is a NULL pointer create a new table. add the key `key' with the value
* `value' to this table. if it already exists within the table overwrite it.
* if `value' is a NULL pointer remove the element from the table, freeing
* the table if it was the last symbol entry.
*
* return pointer to modified list
*/
sym_elem ** sym_add (sym_elem **tab, char *key, char *value);
/* sym_resolve
*
* find the character value associated to the key `key' in the symbol table
* `stab'
*
* return pointer to ASCIIZ value on success
* return NULL on failure
*/
const char * sym_resolve (sym_elem **stab, char *key);
/* sym_free
*
* free a symbol table pointed to by `stab'
*
* return in any case
*/
void sym_free (sym_elem **stab);
#endif
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