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/* SCCSid "$SunId$ LBL" */ |
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|
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/* |
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< |
* Header file for table lookup routines |
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> |
* Header file for general associative table lookup routines |
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*/ |
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|
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typedef struct { |
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< |
char *key; /* key name (dynamically allocated) */ |
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char *key; /* key name */ |
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> |
long hval; /* key hash value (for efficiency) */ |
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char *data; /* pointer to client data */ |
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} LUENT; |
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|
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typedef struct { |
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< |
void (*freek)(); /* free entry key */ |
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void (*freed)(); /* free entry data */ |
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> |
long (*hashf)(); /* key hash function */ |
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> |
int (*keycmp)(); /* key comparison function */ |
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> |
void (*freek)(); /* free a key */ |
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> |
void (*freed)(); /* free the data */ |
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int tsiz; /* current table size */ |
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LUENT *tabl; /* table, if allocated */ |
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int ndel; /* number of deleted entries */ |
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} LUTAB; |
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|
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< |
#define LU_SINIT(fk,fd) {(void (*)())(fk),(void (*)())(fd),0,NULL,0} |
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> |
#define LU_SINIT(fk,fd) {lu_shash,strcmp,(void (*)())(fk),\ |
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> |
(void (*)())(fd),0,NULL,0} |
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|
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/* |
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* The lu_init routine is called to initialize a table. The number of |
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* and the expected (minimum) table size. The value returned is the |
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* actual allocated table size (or zero if there was insufficient memory). |
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* |
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< |
* It isn't fully necessary to initialize the LUTAB structure. If it |
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< |
* is cleared (tsiz = 0, tabl = NULL), then the first call to lu_find |
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< |
* will allocate a minimal table. If key and data free functions are |
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< |
* to be used, the LU_SINIT macro provides a convenient declaration. |
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> |
* The hashf, keycmp, freek and freed member functions must be assigned |
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> |
* separately. If the hash value is sufficient to guarantee equality |
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> |
* between keys, then the keycmp pointer may be NULL. Otherwise, it |
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> |
* should return 0 if the two passed keys match. If it is not necessary |
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> |
* (or possible) to free the key and/or data values, then the freek and/or |
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> |
* freed member functions may be NULL. |
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* |
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+ |
* It isn't fully necessary to call lu_init to initialize the LUTAB structure. |
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+ |
* If tsiz is 0, then the first call to lu_find will allocate a minimal table. |
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+ |
* The LU_SINIT macro provides a convenient static declaration for character |
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+ |
* string keys. |
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+ |
* |
| 48 |
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* The lu_find routine returns the entry corresponding to the given |
| 49 |
< |
* key (any nul-terminated string). If the entry does not exist, the |
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< |
* corresponding key field will be NULL. If the entry has been |
| 51 |
< |
* previously deleted but not yet freed, then only the data field |
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< |
* will be NULL. It is the caller's responsibility to (allocate and) |
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< |
* assign the key and data fields when creating a new entry. |
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< |
* The only case where lu_find returns NULL is when the system |
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< |
* has run out of memory. |
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> |
* key. If the entry does not exist, the corresponding key field will |
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> |
* be NULL. If the entry has been previously deleted but not yet freed, |
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> |
* then only the data field will be NULL. It is the caller's |
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> |
* responsibility to (allocate and) assign the key and data fields when |
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> |
* creating a new entry. The only case where lu_find returns NULL is when |
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> |
* the system has run out of memory. |
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* |
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* The lu_delete routine frees an entry's data (if any) by calling |
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* the freed member function, but does not free the key field. This |
| 69 |
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extern LUENT *lu_find(); |
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extern void lu_delete(); |
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extern void lu_done(); |
| 72 |
< |
extern int lu_hash(); |
| 72 |
> |
extern long lu_shash(); |
| 73 |
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#else |
| 74 |
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extern int lu_init(LUTAB *, int); |
| 75 |
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extern LUENT *lu_find(LUTAB *, char *); |
| 76 |
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extern void lu_delete(LUTAB *, char *); |
| 77 |
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extern void lu_done(LUTAB *); |
| 78 |
< |
extern int lu_hash(char *); |
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> |
extern long lu_shash(char *); |
| 79 |
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#endif |
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+ |
|
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+ |
extern int strcmp(); |
