On 2019-01-03 11:08, Janosch Frank wrote:
> Linemode seems to add a newline for each sent message which makes
> reading rather hard. Hence we add a small buffer that and only print
> if it's full or a newline is encountered.
>
> Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
> ---
> lib/s390x/sclp-console.c | 32 ++++++++++++++++++++++++++++++--
> 1 file changed, 30 insertions(+), 2 deletions(-)
>
> diff --git a/lib/s390x/sclp-console.c b/lib/s390x/sclp-console.c
> index 6b30fab..5d2c9d8 100644
> --- a/lib/s390x/sclp-console.c
> +++ b/lib/s390x/sclp-console.c
> @@ -87,6 +87,9 @@ static uint8_t _ascebc[256] = {
> 0x90, 0x3F, 0x3F, 0x3F, 0x3F, 0xEA, 0x3F, 0xFF
> };
>
> +static char lm_buff[120];
> +static unsigned char lm_buff_off;
> +
> static void sclp_print_ascii(const char *str)
> {
> int len = strlen(str);
> @@ -112,17 +115,40 @@ static void sclp_print_lm(const char *str)
> struct mdb *mdb;
> struct mto *mto;
> struct go *go;
> + char *nl;
> +
> + /*
> + * In contrast to the ascii console, linemode produces a new
> + * line with every write of data. The report() function uses
> + * several printf() calls to generate a line of data which
> + * would all end up on different lines.
> + *
> + * Hence we buffer here until we encounter a \n or the buffer
> + * is full. That means that linemode output can look a bit
> + * different from ascii and that it takes a bit longer for
> + * lines to appear.
> + */
> + len = strlen(str);
> + len = len < (sizeof(lm_buff) - lm_buff_off) ? len : (sizeof(lm_buff) - lm_buff_off);
> + nl = strchr(str, '\n');
> + if ((lm_buff_off < sizeof(lm_buff) - 1)) {
> + memcpy(&lm_buff[lm_buff_off], str, len);
> + lm_buff_off += len;
> + }
> + /* Buffer not full and no newline */
> + if (lm_buff_off != sizeof(lm_buff) - 1 && !nl)
> + return;
>
> sclp_mark_busy();
> sccb = (struct write_sccb *) _sccb;
> end = (unsigned char *) sccb + 4096 - 1;
> memset(sccb, 0, sizeof(*sccb));
> ptr = (unsigned char *) &sccb->msg.mdb.mto;
> - len = strlen(str);
> + len = strlen(lm_buff);
> offset = 0;
> do {
> for (count = sizeof(*mto); offset < len; count++) {
> - ch = str[offset++];
> + ch = lm_buff[offset++];
> if ((ch == 0x0a) || (ptr + count > end))
> break;
> ptr[count] = _ascebc[ch];
> @@ -148,6 +174,8 @@ static void sclp_print_lm(const char *str)
> go->length = sizeof(*go);
> go->type = 1;
> sclp_service_call(SCLP_CMD_WRITE_EVENT_DATA, sccb);
> + memset(lm_buff, 0 , sizeof(lm_buff));
> + lm_buff_off = 0;
> }
Reviewed-by: Thomas Huth <thuth@xxxxxxxxxx>
