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CBSETKCU.C
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1989-08-31
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/* Copyright (c) 1989 Citadel */
/* All Rights Reserved */
/* #ident "cbsetkcu.c 1.1 - 89/08/31" */
#include <blkio.h>
#include <btree.h>
#include <errno.h>
/* #include <stdlib.h> */
/* #include <string.h> */
#include "cbase_.h"
/*man---------------------------------------------------------------------------
NAME
cbsetkcur - set cbase key cursor
SYNOPSIS
#include <cbase.h>
int cbsetkcur(cbp, field, cbkpos_p)
cbase_t *cbp;
int field;
cbkpos_t *cbkpos_p;
DESCRIPTION
The cbsetkcur function sets the position of a key cursor for cbase cbp
to the value pointed to by cbkpos_p. If cbkpos_p is the NULL pointer,
the key cursor is set to null. The record cursor is set to the record
associated with the key marked by the key cursor.
field is the field for which to set the key cursor.
cbsetkcur will fail if one or more of the following is true:
[EINVAL] cbp is not a valid cbase pointer.
[EINVAL] field is less than 1 or greater than
the number of fields defined for cbp.
[CBELOCK] cbp is not locked.
[CBENOPEN] cbp is not open.
SEE ALSO
cbgetkcur, cbsetrcur.
DIAGNOSTICS
Upon successful completion, a value of 0 is returned. Otherwise, a
value of -1 is returned, and errno set to indicate the error.
------------------------------------------------------------------------------*/
int cbsetkcur(cbp, field, cbkpos_p)
cbase_t * cbp;
int field;
cbkpos_t * cbkpos_p;
{
int rs = 0;
btpos_t btpos;
void * buf = NULL;
cbrpos_t cbrpos = 0;
lspos_t lspos = 0;
errno = 0;
/* initialize storage */
memset((void *)&btpos, 0, sizeof(btpos));
/* validate arguments */
if (!cb_valid(cbp)) {
errno = EINVAL;
return -1;
}
if ((field < 1) || (field > cbp->fldcnt)) {
errno = EINVAL;
return -1;
}
/* check if not open */
if (!(cbp->flags & CBOPEN)) {
errno = CBENOPEN;
return -1;
}
/* check if not locked */
if (!(cbp->flags & CBLOCKS)) {
errno = CBELOCK;
return -1;
}
/* set key cursor position */
if (cbkpos_p == NULL) {
rs = btsetcur(cbp->btp[field - 1], NULL);
} else {
memcpy((void *)&btpos, (void *)cbkpos_p, sizeof(btpos));
rs = btsetcur(cbp->btp[field - 1], &btpos);
}
if (rs == -1) {
CBEPRINT;
return -1;
}
/* check if key cursor is null */
if (btcursor(cbp->btp[field - 1]) == NULL) {
rs = lssetcur(cbp->lsp, NULL);
if (rs == -1) {
CBEPRINT;
return -1;
}
errno = 0;
return 0;
}
/* get record position */
buf = calloc(1, btkeysize(cbp->btp[field - 1]));
rs = btgetk(cbp->btp[field - 1], buf);
if (rs == -1) {
CBEPRINT;
free(buf);
return -1;
}
memcpy((void *)&cbrpos, (void *)((char *)buf +
cbp->fields[field - 1].size), sizeof(cbrpos));
free(buf);
buf = NULL;
/* set record cursor position */
lspos = cbrpos;
if (lspos == 0) {
CBEPRINT;
errno = CBEPANIC;
return -1;
}
rs = lssetcur(cbp->lsp, &lspos);
if (rs == -1) {
CBEPRINT;
return -1;
}
errno = 0;
return 0;
}