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Don't immediately give up if a single read() or write() wasn't

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sufficient to transfer all the data from stdin, or to stdout.  Working
on pipes causes further fragmentation.
This commit is contained in:
Joerg Wunsch 1996-04-06 11:00:28 +00:00
parent b58e43fcbe
commit db6ddd3598
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=15077
1 changed files with 31 additions and 5 deletions
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36
sbin/scsi/scsi.c
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@ -39,7 +39,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: scsi.c,v 1.9 1995/07/11 09:21:33 dufault Exp $
* $Id: scsi.c,v 1.10 1995/07/30 12:58:47 joerg Exp $
*/
#include <stdio.h>
@ -281,8 +281,8 @@ do_cmd(int fd, char *fmt, int argc, char **argv)
struct get_hook h;
scsireq_t *scsireq = scsireq_new();
enum data_phase data_phase;
int count;
char *data_fmt;
int count, amount;
char *data_fmt, *bp;
h.argc = argc;
h.argv = argv;
@ -335,11 +335,26 @@ do_cmd(int fd, char *fmt, int argc, char **argv)
{
if (strcmp(data_fmt, "-") == 0) /* Read data from stdin */
{
if (read(0, scsireq->databuf, count) != count)
bp = (char *)scsireq->databuf;
while (count > 0 && (amount = read(0, bp, count)) > 0)
{
count -= amount;
bp += amount;
}
if (amount == -1)
{
perror("read");
exit(errno);
}
else if (amount == 0)
{
/* early EOF */
fprintf(stderr,
"Warning: only read %lu bytes out of %lu.\n",
scsireq->datalen - (u_long)count,
scsireq->datalen);
scsireq->datalen -= (u_long)count;
}
}
else
{
@ -366,11 +381,22 @@ do_cmd(int fd, char *fmt, int argc, char **argv)
{
if (strcmp(data_fmt, "-") == 0) /* stdout */
{
if (write(1, scsireq->databuf, count) != count)
bp = (char *)scsireq->databuf;
while (count > 0 && (amount = write(1, bp, count)) > 0)
{
count -= amount;
bp += amount;
}
if (amount < 0)
{
perror("write");
exit(errno);
}
else if (amount == 0)
fprintf(stderr, "Warning: wrote only %d bytes out of %d.\n",
scsireq->datalen - count,
scsireq->datalen);
}
else
{