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