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annotate cdb.h @ 12:0e21568dec72

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allocate a Cdb struct rather than using a single static one, note that cdb_free does _not_ call alloc_free, just releases the map, in fact alloc_free is not called anywhere!
author Henry S. Thompson <ht@inf.ed.ac.uk>
date Mon, 03 Feb 2025 17:31:23 +0000
parents 41b9b6a160d1
children 70f4df5a7283
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1 /* Public domain. */
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2
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3 #ifndef CDB_H
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4 #define CDB_H
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5
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6 #include "uint32.h"
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7
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8 #define CDB_HASHSTART 5381
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9 extern uint32 cdb_hashadd(uint32,unsigned char);
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10 extern uint32 cdb_hash(char *,unsigned int);
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11
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12 struct cdb {
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13 char *map; /* 0 if no map is available */
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14 int fd;
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15 uint32 size; /* initialized if map is nonzero */
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16 uint32 loop; /* number of hash slots searched under this key */
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17 uint32 khash; /* initialized if loop is nonzero */
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18 uint32 kpos; /* initialized if loop is nonzero */
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19 uint32 hpos; /* initialized if loop is nonzero */
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20 uint32 hslots; /* initialized if loop is nonzero */
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21 uint32 dpos; /* initialized if cdb_findnext() returns 1 */
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22 uint32 dlen; /* initialized if cdb_findnext() returns 1 */
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23 } ;
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24
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25 typedef struct cdb Cdb;
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26
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27 extern Cdb* cdb_new(void);
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28
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29 extern void cdb_clear(Cdb *);
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30 extern void cdb_init(Cdb *,int fd);
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31
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32 extern int cdb_read(Cdb *,char *,unsigned int,uint32);
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33
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34 extern void cdb_findstart(Cdb *);
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35 extern int cdb_findnext(Cdb *,char *,unsigned int);
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36 extern int cdb_find(Cdb *,char *,unsigned int);
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37
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38 /*extern uint32 cdb_pos();
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39 extern uint32 cdb_len();*/
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40 #define cdb_pos(c) ((c)->dpos)
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41 #define cdb_len(c) ((c)->dlen)
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42
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43 /*extern char *cdb_mmap();
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44 extern uint32 cdb_msize();*/
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45 #define cdb_mmap(c) ((c)->map)
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46 #define cdb_msize(c) ((c)->size)
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47
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48 #define cdb_datapos(c) ((c)->dpos)
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49 #define cdb_datalen(c) ((c)->dlen)
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50
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51 #endif