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CBGETKCU.C
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1989-11-08
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/* Copyright (c) 1989 Citadel */
/* All Rights Reserved */
/* #ident "cbgetkcu.c 1.2 - 89/11/08" */
#include <blkio.h>
#include <btree.h>
#include <errno.h>
/*#include <string.h>*/
#include "cbase_.h"
/*man---------------------------------------------------------------------------
NAME
cbgetkcur - get cbase key cursor
SYNOPSIS
#include <cbase.h>
int cbgetkcur(cbp, field, cbkpos_p)
cbase_t *cbp;
int field;
cbkpos_t *cbkpos_p;
DESCRIPTION
The cbgetkcur function gets the position of the key cursor of the
specified field in cbase cbp. The cursor position is returned in
the location pointed to by cbkpos_p.
cbgetkcur will fail if one or more of the following is true:
[EINVAL] cbp is not a valid cbase pointer.
[EINVAL] field is not a valid field number for
cbase cbp.
[EINVAL] cbkpos_p is the NULL pointer.
[CBELOCK] cbp is not locked.
[CBENOPEN] cbp is not open.
SEE ALSO
cbgetrcur, cbsetkcur.
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 cbgetkcur(cbp, field, cbkpos_p)
cbase_t *cbp;
int field;
cbkpos_t *cbkpos_p;
{
btpos_t btpos;
/* initialize storage */
memset(&btpos, 0, sizeof(btpos));
/* validate arguments */
if (!cb_valid(cbp) || (cbkpos_p == NULL)) {
errno = EINVAL;
return -1;
}
/* check if not open */
if (!(cbp->flags & CBOPEN)) {
errno = CBENOPEN;
return -1;
}
/* validate arguments */
if ((field < 0) || (field >= cbp->fldc)) {
errno = EINVAL;
return -1;
}
/* check if not locked */
if (!(cbp->flags & CBLOCKS)) {
errno = CBELOCK;
return -1;
}
/* get key cursor position */
if (btgetcur(cbp->btpv[field], &btpos) == -1) {
CBEPRINT;
return -1;
}
/* load return argument */
memcpy(cbkpos_p, &btpos, sizeof(cbkpos_t));
errno = 0;
return 0;
}