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BGETH.C
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1989-10-31
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/* Copyright (c) 1989 Citadel */
/* All Rights Reserved */
/* #ident "bgeth.c 1.2 - 89/10/31" */
/*#include <stddef.h>*/
#include "blkio_.h"
/*man---------------------------------------------------------------------------
NAME
bgeth - get the header from a block file
SYNOPSIS
#include <blkio.h>
int bgeth(bp, buf)
BLKFILE *bp;
void *buf;
DESCRIPTION
The bgeth function reads the header from the block file
associated with BLKFILE pointer bp. buf must point to a storage
area at least as large as the header size for bp.
bgeth will fail if one or more of the following is true:
[EINVAL] bp is not a valid block file.
[EINVAL] buf is NULL.
[BEEOF] bp is empty.
[BEEOF] End of file encountered within header.
[BENOPEN] bp is not open for reading.
SEE ALSO
bgetb, bgethf, bputh.
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 bgeth(bp, buf)
BLKFILE *bp;
void *buf;
{
return bgethf(bp, (size_t)0, buf, bp->hdrsize);
}