153 lines
4.1 KiB
C
153 lines
4.1 KiB
C
#pragma src "/sys/src/libndb"
|
|
#pragma lib "libndb.a"
|
|
|
|
/*
|
|
* this include file requires includes of <u.h> and <bio.h>
|
|
*/
|
|
typedef struct Ndb Ndb;
|
|
typedef struct Ndbtuple Ndbtuple;
|
|
typedef struct Ndbhf Ndbhf;
|
|
typedef struct Ndbs Ndbs;
|
|
typedef struct Ndbcache Ndbcache;
|
|
|
|
#pragma incomplete Ndbhf
|
|
#pragma incomplete Ndbcache
|
|
|
|
enum
|
|
{
|
|
Ndbalen= 32, /* max attribute length */
|
|
Ndbvlen= 64, /* max value length */
|
|
};
|
|
|
|
/*
|
|
* the database
|
|
*/
|
|
struct Ndb
|
|
{
|
|
Ndb *next;
|
|
|
|
Biobufhdr b; /* buffered input file */
|
|
uchar buf[256]; /* and its buffer */
|
|
|
|
ulong mtime; /* mtime of db file */
|
|
Qid qid; /* qid of db file */
|
|
char file[128]; /* path name of db file */
|
|
ulong length; /* length of db file */
|
|
|
|
int nohash; /* don't look for hash files */
|
|
Ndbhf *hf; /* open hash files */
|
|
|
|
int ncache; /* size of tuple cache */
|
|
Ndbcache *cache; /* cached entries */
|
|
};
|
|
|
|
/*
|
|
* a parsed entry, doubly linked
|
|
*/
|
|
struct Ndbtuple
|
|
{
|
|
char attr[Ndbalen]; /* attribute name */
|
|
char *val; /* value(s) */
|
|
Ndbtuple *entry; /* next tuple in this entry */
|
|
Ndbtuple *line; /* next tuple on this line */
|
|
ulong ptr; /* (for the application - starts 0) */
|
|
char valbuf[Ndbvlen]; /* initial allocation for value */
|
|
};
|
|
|
|
/*
|
|
* each hash file is of the form
|
|
*
|
|
* +---------------------------------------+
|
|
* | mtime of db file (4 bytes) |
|
|
* +---------------------------------------+
|
|
* | size of table (in entries - 4 bytes) |
|
|
* +---------------------------------------+
|
|
* | hash table |
|
|
* +---------------------------------------+
|
|
* | hash chains |
|
|
* +---------------------------------------+
|
|
*
|
|
* hash collisions are resolved using chained entries added to the
|
|
* the end of the hash table.
|
|
*
|
|
* Hash entries are of the form
|
|
*
|
|
* +-------------------------------+
|
|
* | offset (3 bytes) |
|
|
* +-------------------------------+
|
|
*
|
|
* Chain entries are of the form
|
|
*
|
|
* +-------------------------------+
|
|
* | offset1 (3 bytes) |
|
|
* +-------------------------------+
|
|
* | offset2 (3 bytes) |
|
|
* +-------------------------------+
|
|
*
|
|
* The top bit of an offset set to 1 indicates a pointer to a hash chain entry.
|
|
*/
|
|
#define NDBULLEN 4 /* unsigned long length in bytes */
|
|
#define NDBPLEN 3 /* pointer length in bytes */
|
|
#define NDBHLEN (2*NDBULLEN) /* hash file header length in bytes */
|
|
|
|
/*
|
|
* finger pointing to current point in a search
|
|
*/
|
|
struct Ndbs
|
|
{
|
|
Ndb *db; /* data base file being searched */
|
|
Ndbhf *hf; /* hash file being searched */
|
|
int type;
|
|
ulong ptr; /* current pointer */
|
|
ulong ptr1; /* next pointer */
|
|
Ndbtuple *t; /* last attribute value pair found */
|
|
};
|
|
|
|
/*
|
|
* bit defs for pointers in hash files
|
|
*/
|
|
#define NDBSPEC (1<<23)
|
|
#define NDBCHAIN NDBSPEC /* points to a collision chain */
|
|
#define NDBNAP (NDBSPEC|1) /* not a pointer */
|
|
|
|
/*
|
|
* macros for packing and unpacking pointers
|
|
*/
|
|
#define NDBPUTP(v,a) { (a)[0] = v; (a)[1] = (v)>>8; (a)[2] = (v)>>16; }
|
|
#define NDBGETP(a) ((a)[0] | ((a)[1]<<8) | ((a)[2]<<16))
|
|
|
|
/*
|
|
* macros for packing and unpacking unsigned longs
|
|
*/
|
|
#define NDBPUTUL(v,a) { (a)[0] = v; (a)[1] = (v)>>8; (a)[2] = (v)>>16; (a)[3] = (v)>>24; }
|
|
#define NDBGETUL(a) ((a)[0] | ((a)[1]<<8) | ((a)[2]<<16) | ((a)[3]<<24))
|
|
|
|
#define NDB_IPlen 16
|
|
|
|
char* csgetvalue(char*, char*, char*, char*, Ndbtuple**);
|
|
Ndbtuple* csipinfo(char*, char*, char*, char**, int);
|
|
Ndbtuple* dnsquery(char*, char*, char*);
|
|
char* ipattr(char*);
|
|
Ndb* ndbcat(Ndb*, Ndb*);
|
|
int ndbchanged(Ndb*);
|
|
void ndbclose(Ndb*);
|
|
Ndbtuple* ndbconcatenate(Ndbtuple*, Ndbtuple*);
|
|
Ndbtuple* ndbdiscard(Ndbtuple*, Ndbtuple*);
|
|
void ndbfree(Ndbtuple*);
|
|
Ndbtuple* ndbgetipaddr(Ndb*, char*);
|
|
char* ndbgetvalue(Ndb*, Ndbs*, char*, char*, char*, Ndbtuple**);
|
|
Ndbtuple* ndbfindattr(Ndbtuple*, Ndbtuple*, char*);
|
|
ulong ndbhash(char*, int);
|
|
Ndbtuple* ndbipinfo(Ndb*, char*, char*, char**, int);
|
|
Ndbtuple* ndbnew(char*, char*);
|
|
Ndb* ndbopen(char*);
|
|
Ndbtuple* ndbparse(Ndb*);
|
|
int ndbreopen(Ndb*);
|
|
Ndbtuple* ndbreorder(Ndbtuple*, Ndbtuple*);
|
|
Ndbtuple* ndbsearch(Ndb*, Ndbs*, char*, char*);
|
|
void ndbsetval(Ndbtuple*, char*, int);
|
|
Ndbtuple* ndbsnext(Ndbs*, char*, char*);
|
|
Ndbtuple* ndbsubstitute(Ndbtuple*, Ndbtuple*, Ndbtuple*);
|
|
Ndbtuple* ndbdedup(Ndbtuple*);
|
|
void ndbsetmalloctag(Ndbtuple*, uintptr);
|