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CBRECPRE.C
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1989-08-31
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/* Copyright (c) 1989 Citadel */
/* All Rights Reserved */
/* #ident "cbrecpre.c 1.1 - 89/08/31" */
#include <errno.h>
#include <lseq.h>
#include "cbase_.h"
/*man---------------------------------------------------------------------------
NAME
cbrecprev - previous cbase record
SYNOPSIS
#include <cbase.h>
int cbrecprev(cbp)
cbase_t *cbp;
DESCRIPTION
The cbrecprev function retreats the record cursor of cbase cbp to
the previous record. If the cursor is on the first record, it is
retreated to null.
cbrecprev will fail if one or more of the following is true:
[EINVAL] cbp is not a valid cbase pointer.
[CBELOCK] cbp is not locked.
[CBENOPEN] cbp is not open.
SEE ALSO
cbrcursor, cbrecfirst, cbreclast, cbrecnext.
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 cbrecprev(cbp)
cbase_t *cbp;
{
int rs = 0;
errno = 0;
/* validate arguments */
if (!cb_valid(cbp)) {
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;
}
/* retreat cursor to previous record */
rs = lsprev(cbp->lsp);
if (rs == -1) {
CBEPRINT;
return -1;
}
errno = 0;
return 0;
}