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BGETB.C
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1989-10-31
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/* Copyright (c) 1989 Citadel */
/* All Rights Reserved */
/* #ident "bgetb.c 1.2 - 89/10/31" */
/*#include <stddef.h>*/
#include "blkio_.h"
/*man---------------------------------------------------------------------------
NAME
bgetb - get a block from a block file
SYNOPSIS
#include <blkio.h>
int bgetb(bp, bn, buf)
BLKFILE *bp;
bpos_t bn;
void *buf;
DESCRIPTION
The bgetb function reads block number bn from the block file
associated with BLKFILE pointer bp. buf must point to a storage
area at least as large as the block size for bp. Block numbering
starts at 1.
bgetb will fail if one or more of the following is true:
[EINVAL] bp is not a valid BLKFILE pointer.
[EINVAL] bn is less than 1.
[EINVAL] buf is the NULL pointer.
[BEEOF] There are not bn blocks in the file.
[BENOPEN] bp is not open for reading.
SEE ALSO
bgetbf, bgeth, bputb.
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 bgetb(bp, bn, buf)
BLKFILE *bp;
bpos_t bn;
void *buf;
{
return bgetbf(bp, bn, (size_t)0, buf, bp->blksize);
}