guacamole-spice-protocol/protocols/ssh/src/terminal.c

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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is libguac-client-ssh.
*
* The Initial Developer of the Original Code is
* Michael Jumper.
* Portions created by the Initial Developer are Copyright (C) 2011
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* James Muehlner <dagger10k@users.sourceforge.net>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <cairo/cairo.h>
#include <pango/pangocairo.h>
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#include <guacamole/socket.h>
#include <guacamole/protocol.h>
#include <guacamole/client.h>
#include "types.h"
#include "buffer.h"
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#include "display.h"
#include "terminal.h"
#include "terminal_handlers.h"
guac_terminal* guac_terminal_create(guac_client* client,
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int width, int height) {
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guac_terminal_char default_char = {
.value = ' ',
.attributes = {
.foreground = 7,
.background = 0,
.bold = false,
.reverse = false,
.underscore = false
}};
guac_terminal* term = malloc(sizeof(guac_terminal));
term->client = client;
/* Init buffer */
term->buffer = guac_terminal_buffer_alloc(1000, &default_char);
term->scroll_offset = 0;
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/* Init display */
term->display = guac_terminal_display_alloc(client,
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default_char.attributes.foreground,
default_char.attributes.background);
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/* Init terminal state */
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term->current_attributes = default_char.attributes;
term->default_char = default_char;
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term->cursor_row = 0;
term->cursor_col = 0;
term->term_width = width / term->display->char_width;
term->term_height = height / term->display->char_height;
term->char_handler = guac_terminal_echo;
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term->scroll_start = 0;
term->scroll_end = term->term_height - 1;
term->text_selected = false;
/* Size display */
guac_terminal_display_resize(term->display,
term->term_width, term->term_height);
/* Init terminal lock */
pthread_mutex_init(&(term->lock), NULL);
return term;
}
void guac_terminal_free(guac_terminal* term) {
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/* Free display */
guac_terminal_display_free(term->display);
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/* Free buffer */
guac_terminal_buffer_free(term->buffer);
}
int guac_terminal_set(guac_terminal* term, int row, int col, char c) {
/* Build character with current attributes */
guac_terminal_char guac_char;
guac_char.value = c;
guac_char.attributes = term->current_attributes;
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guac_terminal_set_columns(term, row, col, col, &guac_char);
return 0;
}
int guac_terminal_toggle_reverse(guac_terminal* term, int row, int col) {
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guac_terminal_char* guac_char;
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/* Get character from buffer */
guac_terminal_buffer_row* buffer_row = guac_terminal_buffer_get_row(term->buffer, row, col+1);
/* Toggle reverse */
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guac_char = &(buffer_row->characters[col]);
guac_char->attributes.reverse = !(guac_char->attributes.reverse);
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/* Set display */
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guac_terminal_display_set_columns(term->display, row + term->scroll_offset, col, col, guac_char);
return 0;
}
int guac_terminal_write(guac_terminal* term, const char* c, int size) {
while (size > 0) {
term->char_handler(term, *(c++));
size--;
}
return 0;
}
int guac_terminal_scroll_up(guac_terminal* term,
int start_row, int end_row, int amount) {
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/* If scrolling entire display, update scroll offset */
if (start_row == 0 && end_row == term->term_height - 1) {
/* Scroll up visibly */
guac_terminal_display_copy_rows(term->display, start_row + amount, end_row, -amount);
/* Advance by scroll amount */
term->buffer->top += amount;
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if (term->buffer->top >= term->buffer->available)
term->buffer->top -= term->buffer->available;
term->buffer->length += amount;
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if (term->buffer->length > term->buffer->available)
term->buffer->length = term->buffer->available;
}
/* Otherwise, just copy row data upwards */
else
guac_terminal_copy_rows(term, start_row + amount, end_row, -amount);
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/* Clear new area */
guac_terminal_clear_range(term,
end_row - amount + 1, 0,
end_row, term->term_width - 1);
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return 0;
}
int guac_terminal_scroll_down(guac_terminal* term,
int start_row, int end_row, int amount) {
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/* STUB */
return 0;
}
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int guac_terminal_clear_columns(guac_terminal* term,
int row, int start_col, int end_col) {
/* Build space */
guac_terminal_char blank;
blank.value = ' ';
blank.attributes = term->current_attributes;
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/* Clear */
guac_terminal_set_columns(term,
row, start_col, end_col, &blank);
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return 0;
}
int guac_terminal_clear_range(guac_terminal* term,
int start_row, int start_col,
int end_row, int end_col) {
/* If not at far left, must clear sub-region to far right */
if (start_col > 0) {
/* Clear from start_col to far right */
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guac_terminal_clear_columns(term,
start_row, start_col, term->term_width - 1);
/* One less row to clear */
start_row++;
}
/* If not at far right, must clear sub-region to far left */
if (end_col < term->term_width - 1) {
/* Clear from far left to end_col */
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guac_terminal_clear_columns(term, end_row, 0, end_col);
/* One less row to clear */
end_row--;
}
/* Remaining region now guaranteed rectangular. Clear, if possible */
if (start_row <= end_row) {
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int row;
for (row=start_row; row<=end_row; row++) {
/* Clear entire row */
guac_terminal_clear_columns(term, row, 0, term->term_width - 1);
}
}
return 0;
}
void guac_terminal_scroll_display_down(guac_terminal* terminal,
int scroll_amount) {
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int start_row, end_row;
int dest_row;
int row, column;
/* Limit scroll amount by size of scrollback buffer */
if (scroll_amount > terminal->scroll_offset)
scroll_amount = terminal->scroll_offset;
/* If not scrolling at all, don't bother trying */
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if (scroll_amount <= 0)
return;
/* Shift screen up */
if (terminal->term_height > scroll_amount)
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guac_terminal_display_copy_rows(terminal->display,
scroll_amount, terminal->term_height - 1,
-scroll_amount);
/* Advance by scroll amount */
terminal->scroll_offset -= scroll_amount;
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/* Get row range */
end_row = terminal->term_height - terminal->scroll_offset - 1;
start_row = end_row - scroll_amount + 1;
dest_row = terminal->term_height - scroll_amount;
/* Draw new rows from scrollback */
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for (row=start_row; row<=end_row; row++) {
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/* Get row from scrollback */
guac_terminal_buffer_row* buffer_row =
guac_terminal_buffer_get_row(terminal->buffer, row, 0);
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/* Clear row */
guac_terminal_display_set_columns(terminal->display,
dest_row, 0, terminal->display->width, &(terminal->default_char));
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/* Draw row */
guac_terminal_char* current = buffer_row->characters;
for (column=0; column<buffer_row->length; column++)
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guac_terminal_display_set_columns(terminal->display,
dest_row, column, column, current++);
/* Next row */
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dest_row++;
}
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guac_terminal_display_flush(terminal->display);
guac_socket_flush(terminal->client->socket);
}
void guac_terminal_scroll_display_up(guac_terminal* terminal,
int scroll_amount) {
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int start_row, end_row;
int dest_row;
int row, column;
/* Limit scroll amount by size of scrollback buffer */
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if (terminal->scroll_offset + scroll_amount > terminal->buffer->length - terminal->term_height)
scroll_amount = terminal->buffer->length - terminal->scroll_offset - terminal->term_height;
/* If not scrolling at all, don't bother trying */
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if (scroll_amount <= 0)
return;
/* Shift screen down */
if (terminal->term_height > scroll_amount)
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guac_terminal_display_copy_rows(terminal->display,
0, terminal->term_height - scroll_amount - 1,
scroll_amount);
/* Advance by scroll amount */
terminal->scroll_offset += scroll_amount;
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/* Get row range */
start_row = -terminal->scroll_offset;
end_row = start_row + scroll_amount - 1;
dest_row = 0;
/* Draw new rows from scrollback */
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for (row=start_row; row<=end_row; row++) {
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/* Get row from scrollback */
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guac_terminal_buffer_row* buffer_row =
guac_terminal_buffer_get_row(terminal->buffer, row, 0);
/* Clear row */
guac_terminal_display_set_columns(terminal->display,
dest_row, 0, terminal->display->width, &(terminal->default_char));
/* Draw row */
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guac_terminal_char* current = buffer_row->characters;
for (column=0; column<buffer_row->length; column++)
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guac_terminal_display_set_columns(terminal->display,
dest_row, column, column, current++);
/* Next row */
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dest_row++;
}
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guac_terminal_display_flush(terminal->display);
guac_socket_flush(terminal->client->socket);
}
void guac_terminal_select_start(guac_terminal* terminal, int row, int column) {
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/* STUB */
}
void guac_terminal_select_update(guac_terminal* terminal, int row, int column) {
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/* STUB */
}
void guac_terminal_select_end(guac_terminal* terminal) {
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/* STUB */
}
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void guac_terminal_copy_columns(guac_terminal* terminal, int row,
int start_column, int end_column, int offset) {
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guac_terminal_display_copy_columns(terminal->display, row + terminal->scroll_offset,
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start_column, end_column, offset);
guac_terminal_buffer_copy_columns(terminal->buffer, row,
start_column, end_column, offset);
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}
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void guac_terminal_copy_rows(guac_terminal* terminal,
int start_row, int end_row, int offset) {
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guac_terminal_display_copy_rows(terminal->display,
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start_row + terminal->scroll_offset, end_row + terminal->scroll_offset, offset);
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guac_terminal_buffer_copy_rows(terminal->buffer,
start_row, end_row, offset);
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}
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void guac_terminal_set_columns(guac_terminal* terminal, int row,
int start_column, int end_column, guac_terminal_char* character) {
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guac_terminal_display_set_columns(terminal->display, row + terminal->scroll_offset,
start_column, end_column, character);
guac_terminal_buffer_set_columns(terminal->buffer, row,
start_column, end_column, character);
}
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void guac_terminal_resize(guac_terminal* term, int width, int height) {
/* Resize display */
guac_terminal_display_flush(term->display);
guac_terminal_display_resize(term->display, width, height);
/* Commit new dimensions */
term->term_width = width;
term->term_height = height;
}