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s390-ccw: print carriage return with new lines 

The sclp console in the s390 bios writes raw data,
leading console emulators (such as virsh console) to
treat a new line ('\n') as just a new line instead
of as a Unix line feed. Because of this, output
appears in a "stair case" pattern.

Let's print \r\n on every occurrence of a new line
in the string passed to write to amend this issue.

This is in sync with the guest Linux code in
drivers/s390/char/sclp_vt220.c which also does a line feed
conversion in the console part of the driver.

This fixes the s390-ccw and s390-netboot output like
$ virsh start test --console
Domain test started
Connected to domain test
Escape character is ^]
Network boot starting...
                          Using MAC address: 02:01:02:03:04:05
                                                                Requesting information via DHCP:  010

Signed-off-by: Collin L. Walling <walling@linux.vnet.ibm.com>
Message-Id: <1509120893-28054-1-git-send-email-walling@linux.vnet.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Collin L. Walling 2017-10-27 12:14:53 -04:00 committed by Christian Borntraeger
parent 0280b3eb7c
commit 7618c0aefe
1 changed files with 21 additions and 3 deletions
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24
pc-bios/s390-ccw/sclp.c
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@ -76,17 +76,35 @@ static int _strlen(const char *str)
long write(int fd, const void *str, size_t len)
{
WriteEventData *sccb = (void *)_sccb;
const char *p = str;
size_t data_len = 0;
size_t i;
if (fd != 1 && fd != 2) {
return -EIO;
}
sccb->h.length = sizeof(WriteEventData) + len;
for (i = 0; i < len; i++) {
if ((data_len + 1) >= SCCB_DATA_LEN) {
/* We would overflow the sccb buffer, abort early */
len = i;
break;
}
if (*p == '\n') {
/* Terminal emulators might need \r\n, so generate it */
sccb->data[data_len++] = '\r';
}
sccb->data[data_len++] = *p;
p++;
}
sccb->h.length = sizeof(WriteEventData) + data_len;
sccb->h.function_code = SCLP_FC_NORMAL_WRITE;
sccb->ebh.length = sizeof(EventBufferHeader) + len;
sccb->ebh.length = sizeof(EventBufferHeader) + data_len;
sccb->ebh.type = SCLP_EVENT_ASCII_CONSOLE_DATA;
sccb->ebh.flags = 0;
memcpy(sccb->data, str, len);
sclp_service_call(SCLP_CMD_WRITE_EVENT_DATA, sccb);