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CBGETRF.C
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1989-08-31
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/* Copyright (c) 1989 Citadel */
/* All Rights Reserved */
/* #ident "cbgetrf.c 1.1 - 89/08/31" */
#include <blkio.h>
#include <errno.h>
#include <lseq.h>
#include "cbase_.h"
/*man---------------------------------------------------------------------------
NAME
cbgetrf - get cbase record field
SYNOPSIS
#include <cbase.h>
int cbgetrf(cbp, field, buf)
cbase_t *cbp;
int field;
void *buf;
DESCRIPTION
The cbgetrf function reads a field from the current record of cbase
cbp into buf. field is the number of the field to read. buf must
point to a storage area as large as the size of the indicated field.
cbgetrf will fail if one or more of the following is true:
[EINVAL] cbp is not a valid cbase pointer.
[EINVAL] buf is the NULL pointer.
[CBELOCK] cbp is not read locked.
[CBENOPEN] cbp is not open.
[CBENREC] The record cursor for cbp is null.
SEE ALSO
cbcursor, cbgetr, cbputrf.
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 cbgetrf(cbp, field, buf)
cbase_t * cbp;
int field;
void * buf;
{
int rs = 0;
errno = 0;
/* validate arguments */
if ((!cb_valid(cbp)) || (buf == NULL)) {
errno = EINVAL;
return -1;
}
/* check if not open */
if (!(cbp->flags & CBOPEN)) {
errno = CBENOPEN;
return -1;
}
/* check if not read locked */
if (!(cbp->flags & CBRDLCK)) {
errno = CBELOCK;
return -1;
}
/* check if cursor is null */
if (lscursor(cbp->lsp) == NULL) {
errno = CBENREC;
return -1;
}
/* validate field argument */
if ((field < 1) || (field > cbp->fldcnt)) {
errno = EINVAL;
return -1;
}
/* read field */
rs = lsgetrf(cbp->lsp, cbp->fields[field - 1].offset, buf,
cbp->fields[field - 1].size);
if (rs == -1) {
CBEPRINT;
return -1;
}
errno = 0;
return 0;
}