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/****************************************************************
* *
* Copyright (c) 2001-2016 Fidelity National Information *
* Services, Inc. and/or its subsidiaries. All rights reserved. *
* *
* This source code contains the intellectual property *
* of its copyright holder(s), and is made available *
* under a license. If you do not know the terms of *
* the license, please stop and do not read further. *
* *
****************************************************************/
/* iob_read - buffered I/O with GT.M error signaling
void iob_read(BFILE *bf, void *buf, int nbytes)
BFILE *bf: file to read
buf: buffer to place data read;
nbytes: bytes to read.
*/
#include "mdef.h"
#include "gtm_string.h"
#include <errno.h>
#include "gtm_fcntl.h"
#include "gtm_stdio.h"
#include "gtm_unistd.h"
#include "gtm_stat.h"
#include "error.h"
#include "iob.h"
#include "gtmio.h"
#include "gtmmsg.h"
GBLREF uint4 restore_read_errno;
error_def(ERR_IOEOF);
void iob_read(BFILE *bf, char *buf, int nbytes)
{
int4 nread, nreread;
int rc;
if (bf->write_mode)
{
iob_flush(bf);
bf->write_mode = FALSE;
}
# ifdef DEBUG_IOB
PRINTF("iob_read:\tiob_read(%x, %x, %d), bf->remaining = %d\n", bf, buf, nbytes, bf->remaining);
# endif
while (nbytes > bf->remaining)
{
/* copy bytes remaining in buffer */
memcpy(buf, bf->bptr, bf->remaining);
nbytes -= bf->remaining;
buf += bf->remaining;
/* refill */
DOREADRL(bf->fd, bf->buf, bf->bufsiz, nread);
# ifdef DEBUG_IOB
PRINTF("iob_read:\t\tread(%d, %x, %d) = %d\n", bf->fd, bf->buf, bf->bufsiz, nread);
# endif
bf->bptr = bf->buf;
bf->remaining = nread;
/* In case of error, set global variable "restore_read_errno" and return to caller ("mupip_restore")
* for it to do cleanup before exiting.
*/
if ((-1 == nread) || (0 == nread) || (nread % bf->blksiz))
{
restore_read_errno = ((-1 == nread) ? errno : ERR_IOEOF);
gtm_putmsg_csa(CSA_ARG(NULL) VARLSTCNT(1) restore_read_errno);
CLOSEFILE_RESET(bf->fd, rc); /* resets "bf->fd" to FD_INVALID */
return;
}
}
memcpy(buf, bf->bptr, nbytes);
bf->bptr += nbytes;
bf->remaining -= nbytes;
}
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