int
sclp_emit_buffer(struct sclp_buffer *buffer,
void (*callback)(struct sclp_buffer *, int))
{
struct write_sccb *sccb;
/* add current line if there is one */
if (buffer->current_line != NULL)
sclp_finalize_mto(buffer);
/* Are there messages in the output buffer ? */
if (buffer->mto_number == 0)
return -EIO;
sccb = buffer->sccb;
if (sclp_rw_event.sclp_receive_mask & EVTYP_MSG_MASK)
/* Use normal write message */
sccb->msg_buf.header.type = EVTYP_MSG;
else if (sclp_rw_event.sclp_receive_mask & EVTYP_PMSGCMD_MASK)
/* Use write priority message */
sccb->msg_buf.header.type = EVTYP_PMSGCMD;
else
return -ENOSYS;
buffer->request.command = SCLP_CMDW_WRITE_EVENT_DATA;
buffer->request.status = SCLP_REQ_FILLED;
buffer->request.callback = sclp_writedata_callback;
buffer->request.callback_data = buffer;
buffer->request.sccb = sccb;
buffer->callback = callback;
return sclp_add_request(&buffer->request);
}
void
sclp_set_columns(struct sclp_buffer *buffer, unsigned short columns)
{
buffer->columns = columns;
if (buffer->current_line != NULL &&
buffer->current_length > buffer->columns)
sclp_finalize_mto(buffer);
}
/*
* Setup the request structure in the struct sclp_buffer to do SCLP Write
* Event Data and pass the request to the core SCLP loop.
*/
void
sclp_emit_buffer(struct sclp_buffer *buffer,
void (*callback)(struct sclp_buffer *, int))
{
struct write_sccb *sccb;
/* add current line if there is one */
if (buffer->current_line != NULL)
sclp_finalize_mto(buffer);
/* Are there messages in the output buffer ? */
if (buffer->mto_number == 0) {
if (callback != NULL)
callback(buffer, 0);
return;
}
sccb = buffer->sccb;
if (sclp_rw_event.sclp_send_mask & EvTyp_Msg_Mask)
/* Use normal write message */
sccb->msg_buf.header.type = EvTyp_Msg;
else if (sclp_rw_event.sclp_send_mask & EvTyp_PMsgCmd_Mask)
/* Use write priority message */
sccb->msg_buf.header.type = EvTyp_PMsgCmd;
else {
if (callback != NULL)
callback(buffer, -ENOSYS);
return;
}
buffer->request.command = SCLP_CMDW_WRITEDATA;
buffer->request.status = SCLP_REQ_FILLED;
buffer->request.callback = sclp_writedata_callback;
buffer->request.callback_data = buffer;
buffer->request.sccb = sccb;
buffer->callback = callback;
sclp_add_request(&buffer->request);
}
int
sclp_write(struct sclp_buffer *buffer, const unsigned char *msg, int count)
{
int spaces, i_msg;
int rc;
/*
* parse msg for escape sequences (\t,\v ...) and put formated
* msg into an mto (created by sclp_initialize_mto).
*
* We have to do this work ourselfs because there is no support for
* these characters on the native machine and only partial support
* under VM (Why does VM interpret \n but the native machine doesn't ?)
*
* Depending on i/o-control setting the message is always written
* immediately or we wait for a final new line maybe coming with the
* next message. Besides we avoid a buffer overrun by writing its
* content.
*
* RESTRICTIONS:
*
* \r and \b work within one line because we are not able to modify
* previous output that have already been accepted by the SCLP.
*
* \t combined with following \r is not correctly represented because
* \t is expanded to some spaces but \r does not know about a
* previous \t and decreases the current position by one column.
* This is in order to a slim and quick implementation.
*/
for (i_msg = 0; i_msg < count; i_msg++) {
switch (msg[i_msg]) {
case '\n': /* new line, line feed (ASCII) */
/* check if new mto needs to be created */
if (buffer->current_line == NULL) {
rc = sclp_initialize_mto(buffer, 0);
if (rc)
return i_msg;
}
sclp_finalize_mto(buffer);
break;
case '\a': /* bell, one for several times */
/* set SCLP sound alarm bit in General Object */
buffer->sccb->msg_buf.mdb.go.general_msg_flags |=
GNRLMSGFLGS_SNDALRM;
break;
case '\t': /* horizontal tabulator */
/* check if new mto needs to be created */
if (buffer->current_line == NULL) {
rc = sclp_initialize_mto(buffer,
buffer->columns);
if (rc)
return i_msg;
}
/* "go to (next htab-boundary + 1, same line)" */
do {
if (buffer->current_length >= buffer->columns)
break;
/* ok, add a blank */
*buffer->current_line++ = 0x40;
buffer->current_length++;
} while (buffer->current_length % buffer->htab);
break;
case '\f': /* form feed */
case '\v': /* vertical tabulator */
/* "go to (actual column, actual line + 1)" */
/* = new line, leading spaces */
if (buffer->current_line != NULL) {
spaces = buffer->current_length;
sclp_finalize_mto(buffer);
rc = sclp_initialize_mto(buffer,
buffer->columns);
if (rc)
return i_msg;
memset(buffer->current_line, 0x40, spaces);
buffer->current_line += spaces;
buffer->current_length = spaces;
} else {
/* one an empty line this is the same as \n */
rc = sclp_initialize_mto(buffer,
buffer->columns);
if (rc)
return i_msg;
sclp_finalize_mto(buffer);
}
break;
case '\b': /* backspace */
/* "go to (actual column - 1, actual line)" */
/* decrement counter indicating position, */
/* do not remove last character */
if (buffer->current_line != NULL &&
buffer->current_length > 0) {
buffer->current_length--;
buffer->current_line--;
}
break;
case 0x00: /* end of string */
/* transfer current line to SCCB */
if (buffer->current_line != NULL)
sclp_finalize_mto(buffer);
/* skip the rest of the message including the 0 byte */
i_msg = count - 1;
break;
default: /* no escape character */
/* do not output unprintable characters */
if (!isprint(msg[i_msg]))
break;
/* check if new mto needs to be created */
if (buffer->current_line == NULL) {
rc = sclp_initialize_mto(buffer,
buffer->columns);
if (rc)
return i_msg;
}
*buffer->current_line++ = sclp_ascebc(msg[i_msg]);
buffer->current_length++;
break;
}
/* check if current mto is full */
if (buffer->current_line != NULL &&
buffer->current_length >= buffer->columns)
sclp_finalize_mto(buffer);
}
/* return number of processed characters */
return i_msg;
}
/*
* processing of a message including escape characters,
* returns number of characters written to the output sccb
* ("processed" means that is not guaranteed that the character have already
* been sent to the SCLP but that it will be done at least next time the SCLP
* is not busy)
*/
int
sclp_write(struct sclp_buffer *buffer, const unsigned char *msg, int count)
{
int spaces, i_msg;
int rc;
/*
* parse msg for escape sequences (\t,\v ...) and put formated
* msg into an mto (created by sclp_initialize_mto).
*
* We have to do this work ourselfs because there is no support for
* these characters on the native machine and only partial support
* under VM (Why does VM interpret \n but the native machine doesn't ?)
*
* Depending on i/o-control setting the message is always written
* immediately or we wait for a final new line maybe coming with the
* next message. Besides we avoid a buffer overrun by writing its
* content.
*
* RESTRICTIONS:
*
* \r and \b work within one line because we are not able to modify
* previous output that have already been accepted by the SCLP.
*
* \t combined with following \r is not correctly represented because
* \t is expanded to some spaces but \r does not know about a
* previous \t and decreases the current position by one column.
* This is in order to a slim and quick implementation.
*/
for (i_msg = 0; i_msg < count; i_msg++) {
switch (msg[i_msg]) {
case '\n':
if (buffer->current_line == NULL) {
rc = sclp_initialize_mto(buffer, 0);
if (rc)
return i_msg;
}
sclp_finalize_mto(buffer);
break;
case '\a':
buffer->sccb->msg_buf.mdb.go.general_msg_flags |=
GNRLMSGFLGS_SNDALRM;
break;
case '\t':
if (buffer->current_line == NULL) {
rc = sclp_initialize_mto(buffer,
buffer->columns);
if (rc)
return i_msg;
}
do {
if (buffer->current_length >= buffer->columns)
break;
*buffer->current_line++ = 0x40;
buffer->current_length++;
} while (buffer->current_length % buffer->htab);
break;
case '\f':
case '\v':
if (buffer->current_line != NULL) {
spaces = buffer->current_length;
sclp_finalize_mto(buffer);
rc = sclp_initialize_mto(buffer,
buffer->columns);
if (rc)
return i_msg;
memset(buffer->current_line, 0x40, spaces);
buffer->current_line += spaces;
buffer->current_length = spaces;
} else {
rc = sclp_initialize_mto(buffer,
buffer->columns);
if (rc)
return i_msg;
sclp_finalize_mto(buffer);
}
break;
case '\b':
if (buffer->current_line != NULL &&
buffer->current_length > 0) {
buffer->current_length--;
buffer->current_line--;
}
break;
case 0x00:
if (buffer->current_line != NULL)
sclp_finalize_mto(buffer);
i_msg = count - 1;
break;
default:
if (!isprint(msg[i_msg]))
break;
if (buffer->current_line == NULL) {
rc = sclp_initialize_mto(buffer,
buffer->columns);
if (rc)
return i_msg;
}
*buffer->current_line++ = sclp_ascebc(msg[i_msg]);
buffer->current_length++;
break;
}
if (buffer->current_line != NULL &&
buffer->current_length >= buffer->columns)
sclp_finalize_mto(buffer);
}
return i_msg;
}