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/* cdb_seq.c: sequential record retrieval routines
*
* This file is a part of tinycdb package.
* Copyright (C) 2001-2023 Michael Tokarev <mjt+cdb@corpit.ru>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include "cdb_int.h"
int
cdb_seqnext(unsigned *cptr, struct cdb *cdbp) {
unsigned klen, vlen;
unsigned pos = *cptr;
unsigned dend = cdbp->cdb_dend;
const unsigned char *mem = cdbp->cdb_mem;
if (pos > dend - 8)
return 0;
klen = cdb_unpack(mem + pos);
vlen = cdb_unpack(mem + pos + 4);
pos += 8;
if (dend - klen < pos || dend - vlen < pos + klen)
return errno = EPROTO, -1;
cdbp->cdb_kpos = pos;
cdbp->cdb_klen = klen;
cdbp->cdb_vpos = pos + klen;
cdbp->cdb_vlen = vlen;
*cptr = pos + klen + vlen;
return 1;
}
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