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authorCollin L. Walling <walling@linux.vnet.ibm.com>2017-10-27 12:14:53 -0400
committerChristian Borntraeger <borntraeger@de.ibm.com>2017-10-30 09:04:11 +0100
commit7618c0aefed1dd687539de0606111356dd02b4dc (patch)
tree1767d19d9366325a09e9ce11e52946edf0d4c2d9 /pc-bios
parent0280b3eb7c0519b43452c05cf51f8777d9e38975 (diff)
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>
Diffstat (limited to 'pc-bios')
-rw-r--r--pc-bios/s390-ccw/sclp.c24
1 files changed, 21 insertions, 3 deletions
diff --git a/pc-bios/s390-ccw/sclp.c b/pc-bios/s390-ccw/sclp.c
index b1fc8ff44b..90d1bc3147 100644
--- a/pc-bios/s390-ccw/sclp.c
+++ b/pc-bios/s390-ccw/sclp.c
@@ -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);