29 lines
701 B
C
29 lines
701 B
C
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/* cdb_seq.c: sequential record retrieval routines
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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 "cdb_int.h"
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int
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cdb_seqnext(unsigned *cptr, struct cdb *cdbp) {
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unsigned klen, vlen;
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unsigned pos = *cptr;
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unsigned dend = cdbp->cdb_dend;
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const unsigned char *mem = cdbp->cdb_mem;
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if (pos > dend - 8)
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return 0;
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klen = cdb_unpack(mem + pos);
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vlen = cdb_unpack(mem + pos + 4);
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pos += 8;
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if (dend - klen < pos || dend - vlen < pos + klen)
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return errno = EPROTO, -1;
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cdbp->cdb_kpos = pos;
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cdbp->cdb_klen = klen;
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cdbp->cdb_vpos = pos + klen;
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cdbp->cdb_vlen = vlen;
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*cptr = pos + klen + vlen;
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return 1;
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}
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