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sysadm |
1.1 |
/* "advanced" cdb_make_put routine
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*
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* This file is a part of tinycdb package by Michael Tokarev, mjt@corpit.ru.
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* Public domain.
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*/
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#include "common/setup_before.h"
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#ifdef STDC_HEADERS
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# include <stdlib.h>
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#else
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# ifdef HAVE_MALLOC_H
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# include <malloc.h>
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# endif
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#endif
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#include "common/xalloc.h"
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#include "cdb_int.h"
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#include "common/setup_after.h"
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int
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cdb_make_put(struct cdb_make *cdbmp,
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const void *key, unsigned klen,
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const void *val, unsigned vlen,
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int flags)
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{
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unsigned char rlen[8];
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unsigned hval = cdb_hash(key, klen);
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struct cdb_rl *rl;
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int c, r;
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switch(flags) {
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case CDB_PUT_REPLACE:
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case CDB_PUT_INSERT:
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case CDB_PUT_WARN:
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c = _cdb_make_find(cdbmp, key, klen, hval, &rl);
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if (c < 0)
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return -1;
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if (c) {
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if (flags == CDB_PUT_INSERT)
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return errno = EEXIST, 1;
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else if (flags == CDB_PUT_REPLACE) {
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--c;
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r = 1;
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break;
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}
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else
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r = 1;
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}
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/* fall */
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case CDB_PUT_ADD:
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rl = cdbmp->cdb_rec[hval&255];
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if (!rl || rl->cnt >= sizeof(rl->rec)/sizeof(rl->rec[0])) {
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rl = (struct cdb_rl*)xmalloc(sizeof(struct cdb_rl));
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if (!rl)
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return errno = ENOMEM, -1;
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rl->cnt = 0;
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rl->next = cdbmp->cdb_rec[hval&255];
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cdbmp->cdb_rec[hval&255] = rl;
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}
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c = rl->cnt;
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r = 0;
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break;
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default:
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return errno = EINVAL, -1;
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}
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if (klen > 0xffffffff - (cdbmp->cdb_dpos + 8) ||
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vlen > 0xffffffff - (cdbmp->cdb_dpos + klen + 8))
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return errno = ENOMEM, -1;
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rl->rec[c].hval = hval;
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rl->rec[c].rpos = cdbmp->cdb_dpos;
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if ((unsigned)c == rl->cnt) {
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++rl->cnt;
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++cdbmp->cdb_rcnt;
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}
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cdb_pack(klen, rlen);
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cdb_pack(vlen, rlen + 4);
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if (_cdb_make_write(cdbmp, rlen, 8) < 0 ||
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_cdb_make_write(cdbmp, key, klen) < 0 ||
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_cdb_make_write(cdbmp, val, vlen) < 0)
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return -1;
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return r;
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}
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