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tsearch2 module

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This commit is contained in:
Teodor Sigaev
2003-07-21 10:27:44 +00:00
parent a605382670
commit b88605337e
63 changed files with 16908 additions and 0 deletions
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contrib/tsearch2/snmap.c Normal file
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/*
* simple but fast map from str to Oid
* Teodor Sigaev <teodor@sigaev.ru>
*/
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "postgres.h"
#include "snmap.h"
#include "common.h"
static int
compareSNMapEntry(const void *a, const void *b) {
return strcmp( ((SNMapEntry*)a)->key, ((SNMapEntry*)b)->key );
}
void
addSNMap( SNMap *map, char *key, Oid value ) {
if (map->len>=map->reallen) {
SNMapEntry *tmp;
int len = (map->reallen) ? 2*map->reallen : 16;
tmp=(SNMapEntry*)realloc(map->list, sizeof(SNMapEntry) * len);
if ( !tmp )
elog(ERROR, "No memory");
map->reallen=len;
map->list=tmp;
}
map->list[ map->len ].key = strdup(key);
if ( ! map->list[ map->len ].key )
elog(ERROR, "No memory");
map->list[ map->len ].value=value;
map->len++;
if ( map->len>1 ) qsort(map->list, map->len, sizeof(SNMapEntry), compareSNMapEntry);
}
void
addSNMap_t( SNMap *map, text *key, Oid value ) {
char *k=text2char( key );
addSNMap(map, k, value);
pfree(k);
}
Oid
findSNMap( SNMap *map, char *key ) {
SNMapEntry *ptr;
SNMapEntry ks = {key, 0};
if ( map->len==0 || !map->list )
return 0;
ptr = (SNMapEntry*) bsearch(&ks, map->list, map->len, sizeof(SNMapEntry), compareSNMapEntry);
return (ptr) ? ptr->value : 0;
}
Oid
findSNMap_t( SNMap *map, text *key ) {
char *k=text2char(key);
int res;
res= findSNMap(map, k);
pfree(k);
return res;
}
void freeSNMap( SNMap *map ) {
SNMapEntry *entry=map->list;
if ( map->list ) {
while( map->len ) {
if ( entry->key ) free(entry->key);
entry++; map->len--;
}
free( map->list );
}
memset(map,0,sizeof(SNMap));
}