106 lines
2.4 KiB
C
106 lines
2.4 KiB
C
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/****************************************************************
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* *
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* Copyright 2001, 2009 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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/* iob_read - buffered I/O with GT.M error signaling
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void iob_read(BFILE *bf, void *buf, int nbytes)
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BFILE *bf: file to read
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buf: buffer to place data read;
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nbytes: bytes to read.
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*/
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#include "mdef.h"
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#include "gtm_string.h"
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#include <errno.h>
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#include "gtm_fcntl.h"
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#include "gtm_stdio.h"
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#include "gtm_unistd.h"
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#include "gtm_stat.h"
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#include "error.h"
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#include "iob.h"
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#include "gtmio.h"
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void iob_flush(BFILE *bf);
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void iob_read(BFILE *bf, char *buf, int nbytes)
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{
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int4 nread, nreread;
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int rc;
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error_def(ERR_IOEOF);
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if (bf->write_mode)
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{
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iob_flush(bf);
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bf->write_mode = FALSE;
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}
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#ifdef DEBUG_IOB
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PRINTF("iob_read:\tiob_read(%x, %x, %d), bf->remaining = %d\n",
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bf, buf, nbytes, bf->remaining);
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#endif
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while (nbytes > bf->remaining)
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{
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/* copy bytes remaining in buffer */
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memcpy(buf, bf->bptr, bf->remaining);
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nbytes -= bf->remaining;
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buf += bf->remaining;
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/* refill */
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DOREADRL(bf->fd, bf->buf, bf->bufsiz, nread);
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#ifdef DEBUG_IOB
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PRINTF("iob_read:\t\tread(%d, %x, %d) = %d\n", bf->fd, bf->buf,
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bf->bufsiz, nread);
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#endif
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bf->bptr = bf->buf;
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bf->remaining = nread;
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if (nread == -1)
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{
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rts_error(VARLSTCNT(1) errno);
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return;
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}
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else if (nread == 0 || nread % bf->blksiz)
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{
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CLOSEFILE_RESET(bf->fd, rc); /* resets "bf->fd" to FD_INVALID */
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rts_error(VARLSTCNT(1) ERR_IOEOF);
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/* if we continued from here, assume that this is a magnetic
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tape and we have loaded the next volume. Re-open and
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finish the read operation.
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*/
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while (FD_INVALID == (bf->fd = OPEN3(bf->path,bf->oflag,bf->mode)))
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rts_error(VARLSTCNT(1) errno);
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DOREADRL(bf->fd, bf->buf + nread, bf->bufsiz - nread, nreread);
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#ifdef DEBUG_IOB
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PRINTF("iob_read:\t\tread(%d, %x, %d) = %d\n", bf->fd, bf->buf,
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bf->bufsiz, nread);
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#endif
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if (nreread < bf->bufsiz - nread)
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{
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rts_error(VARLSTCNT(1) errno);
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return;
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}
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bf->remaining = nread;
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}
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}
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memcpy(buf, bf->bptr, nbytes);
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bf->bptr += nbytes;
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bf->remaining -= nbytes;
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}
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