549 lines
16 KiB
C
549 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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*
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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 "terminal.h"
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#include "terminal_handlers.h"
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int guac_terminal_echo(guac_terminal* term, char c) {
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static int bytes_remaining = 0;
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static int codepoint = 0;
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/* 1-byte UTF-8 codepoint */
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if ((c & 0x80) == 0x00) { /* 0xxxxxxx */
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codepoint = c & 0x7F;
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bytes_remaining = 0;
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}
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/* 2-byte UTF-8 codepoint */
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else if ((c & 0xE0) == 0xC0) { /* 110xxxxx */
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codepoint = c & 0x1F;
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bytes_remaining = 1;
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}
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/* 3-byte UTF-8 codepoint */
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else if ((c & 0xF0) == 0xE0) { /* 1110xxxx */
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codepoint = c & 0x0F;
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bytes_remaining = 2;
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}
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/* 4-byte UTF-8 codepoint */
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else if ((c & 0xF8) == 0xF0) { /* 11110xxx */
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codepoint = c & 0x07;
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bytes_remaining = 3;
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}
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/* Continuation of UTF-8 codepoint */
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else if ((c & 0xC0) == 0x80) { /* 10xxxxxx */
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codepoint = (codepoint << 6) | (c & 0x3F);
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bytes_remaining--;
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}
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else {
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/* FIXME: Handle */
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}
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/* If we need more bytes, wait for more bytes */
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if (bytes_remaining != 0)
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return 0;
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switch (codepoint) {
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/* Bell */
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case 0x07:
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break;
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/* Backspace */
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case 0x08:
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if (term->cursor_col >= 1)
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term->cursor_col--;
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break;
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/* Carriage return */
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case '\r':
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term->cursor_col = 0;
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break;
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/* Line feed */
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case '\n':
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term->cursor_row++;
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/* Scroll up if necessary */
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if (term->cursor_row > term->scroll_end) {
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term->cursor_row = term->scroll_end;
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/* Scroll up by one row */
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guac_terminal_scroll_up(term, term->scroll_start,
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term->scroll_end, 1);
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}
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break;
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/* ESC */
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case 0x1B:
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term->char_handler = guac_terminal_escape;
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break;
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/* Displayable chars */
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default:
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/* Wrap if necessary */
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if (term->cursor_col >= term->term_width) {
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term->cursor_col = 0;
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term->cursor_row++;
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}
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/* Scroll up if necessary */
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if (term->cursor_row > term->scroll_end) {
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term->cursor_row = term->scroll_end;
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/* Scroll up by one row */
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guac_terminal_scroll_up(term, term->scroll_start,
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term->scroll_end, 1);
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}
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/* For now, render all but basic latin as '?' */
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if (codepoint > 0x7F)
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codepoint = '?';
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/* Write character */
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guac_terminal_set(term,
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term->cursor_row,
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term->cursor_col,
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(char) codepoint);
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/* Advance cursor */
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term->cursor_col++;
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}
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return 0;
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}
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int guac_terminal_escape(guac_terminal* term, char c) {
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switch (c) {
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case '(':
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term->char_handler = guac_terminal_charset;
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break;
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case ']':
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term->char_handler = guac_terminal_osc;
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break;
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case '[':
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term->char_handler = guac_terminal_csi;
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break;
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default:
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guac_client_log_info(term->client, "Unhandled ESC sequence: %c", c);
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term->char_handler = guac_terminal_echo;
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}
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return 0;
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}
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int guac_terminal_charset(guac_terminal* term, char c) {
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term->char_handler = guac_terminal_echo;
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return 0;
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}
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int guac_terminal_csi(guac_terminal* term, char c) {
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/* CSI function arguments */
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static int argc = 0;
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static int argv[16] = {0};
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/* Argument building counter and buffer */
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static int argv_length = 0;
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static char argv_buffer[256];
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/* FIXME: "The sequence of parameters may be preceded by a single question mark. */
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if (c == '?')
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return 0;
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/* Digits get concatenated into argv */
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if (c >= '0' && c <= '9') {
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/* Concatenate digit if there is space in buffer */
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if (argv_length < sizeof(argv_buffer)-1)
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argv_buffer[argv_length++] = c;
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}
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/* Any non-digit stops the parameter, and possibly the sequence */
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else {
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int i, row, col, amount;
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/* At most 16 parameters */
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if (argc < 16) {
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/* Finish parameter */
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argv_buffer[argv_length] = 0;
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argv[argc++] = atoi(argv_buffer);
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/* Prepare for next parameter */
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argv_length = 0;
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}
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/* Handle CSI functions */
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switch (c) {
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/* A: Move up */
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case 'A':
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/* Get move amount */
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amount = argv[0];
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if (amount == 0) amount = 1;
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/* Move cursor */
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term->cursor_row -= amount;
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if (term->cursor_row < 0)
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term->cursor_row = 0;
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break;
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/* B: Move down */
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case 'B':
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/* Get move amount */
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amount = argv[0];
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if (amount == 0) amount = 1;
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/* Move cursor */
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term->cursor_row += amount;
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if (term->cursor_row >= term->term_height)
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term->cursor_row = term->term_height - 1;
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break;
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/* D: Move left */
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case 'D':
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/* Get move amount */
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amount = argv[0];
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if (amount == 0) amount = 1;
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/* Move cursor */
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term->cursor_col -= amount;
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if (term->cursor_col < 0)
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term->cursor_col = 0;
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break;
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/* C: Move right */
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case 'C':
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/* Get move amount */
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amount = argv[0];
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if (amount == 0) amount = 1;
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/* Move cursor */
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term->cursor_col += amount;
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if (term->cursor_col >= term->term_width)
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term->cursor_col = term->term_width - 1;
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break;
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/* m: Set graphics rendition */
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case 'm':
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for (i=0; i<argc; i++) {
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int value = argv[i];
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/* Reset attributes */
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if (value == 0)
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term->current_attributes = term->default_attributes;
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/* Bold */
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else if (value == 1)
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term->current_attributes.bold = true;
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/* Underscore on */
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else if (value == 4)
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term->current_attributes.underscore = true;
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/* Foreground */
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else if (value >= 30 && value <= 37)
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term->current_attributes.foreground = value - 30;
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/* Background */
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else if (value >= 40 && value <= 47)
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term->current_attributes.background = value - 40;
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/* Underscore on, default foreground */
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else if (value == 38) {
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term->current_attributes.underscore = true;
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term->current_attributes.foreground =
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term->default_attributes.foreground;
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}
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/* Underscore off, default foreground */
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else if (value == 39) {
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term->current_attributes.underscore = false;
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term->current_attributes.foreground =
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term->default_attributes.foreground;
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}
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/* Reset background */
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else if (value == 49)
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term->current_attributes.background =
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term->default_attributes.background;
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/* Reverse video */
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else if (value == 7)
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term->current_attributes.reverse = true;
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/* Reset reverse video */
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else if (value == 27)
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term->current_attributes.reverse = false;
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/* Reset intensity */
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else if (value == 27)
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term->current_attributes.bold = false;
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else
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guac_client_log_info(term->client,
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"Unhandled graphics rendition: %i", value);
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}
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break;
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/* r: Set scrolling region */
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case 'r':
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term->scroll_start = argv[0]-1;
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term->scroll_end = argv[1]-1;
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break;
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/* H: Move cursor */
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case 'H':
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row = argv[0]; if (row != 0) row--;
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col = argv[1]; if (col != 0) col--;
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term->cursor_row = row;
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term->cursor_col = col;
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break;
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/* G: Move cursor, current row */
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case 'G':
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col = argv[0]; if (col != 0) col--;
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term->cursor_col = col;
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break;
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/* d: Move cursor, current col */
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case 'd':
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row = argv[0]; if (row != 0) row--;
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term->cursor_row = row;
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break;
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/* J: Erase display */
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case 'J':
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/* Erase from cursor to end of display */
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if (argv[0] == 0)
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guac_terminal_clear_range(term,
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term->cursor_row, term->cursor_col,
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term->term_height-1, term->term_width-1);
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/* Erase from start to cursor */
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else if (argv[0] == 1)
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guac_terminal_clear_range(term,
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0, 0,
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term->cursor_row, term->cursor_col);
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/* Entire screen */
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else if (argv[0] == 2)
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guac_terminal_clear(term,
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0, 0, term->term_height, term->term_width);
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break;
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/* K: Erase line */
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case 'K':
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/* Erase from cursor to end of line */
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if (argv[0] == 0)
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guac_terminal_clear(term,
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term->cursor_row, term->cursor_col,
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1, term->term_width - term->cursor_col);
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/* Erase from start to cursor */
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else if (argv[0] == 1)
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guac_terminal_clear(term,
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term->cursor_row, 0,
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1, term->cursor_col + 1);
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/* Erase line */
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else if (argv[0] == 2)
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guac_terminal_clear(term,
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term->cursor_row, 0,
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1, term->term_width);
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break;
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/* L: Insert blank lines (scroll down) */
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case 'L':
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amount = argv[0];
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if (amount == 0) amount = 1;
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guac_terminal_scroll_down(term,
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term->cursor_row, term->scroll_end, amount);
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break;
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/* M: Delete lines (scroll up) */
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case 'M':
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amount = argv[0];
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if (amount == 0) amount = 1;
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guac_terminal_scroll_up(term,
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term->cursor_row, term->scroll_end, amount);
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break;
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/* P: Delete characters (scroll left) */
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case 'P':
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amount = argv[0];
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if (amount == 0) amount = 1;
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/* Scroll left by amount */
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if (term->cursor_col + amount < term->term_width)
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guac_terminal_copy(term,
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term->cursor_row, term->cursor_col + amount,
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1,
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term->term_width - term->cursor_col - amount,
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term->cursor_row, term->cursor_col);
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/* Clear right */
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guac_terminal_clear(term,
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term->cursor_row, term->term_width - amount,
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1, amount);
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break;
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/* X: Erase characters (no scroll) */
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case 'X':
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amount = argv[0];
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if (amount == 0) amount = 1;
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/* Clear characters */
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guac_terminal_clear(term,
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term->cursor_row, term->cursor_col,
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1, amount);
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break;
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/* @: Insert characters (scroll right) */
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case '@':
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amount = argv[0];
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if (amount == 0) amount = 1;
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/* Scroll right by amount */
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if (term->cursor_col + amount < term->term_width)
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guac_terminal_copy(term,
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term->cursor_row, term->cursor_col,
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1, term->term_width - term->cursor_col - amount,
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term->cursor_row, term->cursor_col + amount);
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/* Clear left */
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guac_terminal_clear(term,
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term->cursor_row, term->cursor_col,
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1, amount);
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break;
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/* Warn of unhandled codes */
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default:
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if (c != ';') {
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guac_client_log_info(term->client,
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"Unhandled CSI sequence: %c", c);
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for (i=0; i<argc; i++)
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guac_client_log_info(term->client,
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" -> argv[%i] = %i", i, argv[i]);
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}
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}
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/* If not a semicolon, end of CSI sequence */
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if (c != ';') {
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term->char_handler = guac_terminal_echo;
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/* Reset parameters */
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for (i=0; i<argc; i++)
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argv[i] = 0;
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/* Reset argument counters */
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argc = 0;
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argv_length = 0;
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}
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}
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return 0;
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}
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int guac_terminal_osc(guac_terminal* term, char c) {
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/* TODO: Implement OSC */
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if (c == 0x9C || c == 0x5C || c == 0x07) /* ECMA-48 ST (String Terminator */
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term->char_handler = guac_terminal_echo;
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return 0;
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}
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