in src/terminal/terminal-handlers.c [702:1305]
int guac_terminal_csi(guac_terminal* term, unsigned char c) {
/* CSI function arguments */
static int argc = 0;
static int argv[16] = {0};
/* Sequence prefix, if any */
static char private_mode_character = 0;
/* Argument building counter and buffer */
static int argv_length = 0;
static char argv_buffer[256];
/* Digits get concatenated into argv */
if (c >= '0' && c <= '9') {
/* Concatenate digit if there is space in buffer */
if (argv_length < sizeof(argv_buffer)-1)
argv_buffer[argv_length++] = c;
}
/* Specific non-digits stop the parameter, and possibly the sequence */
else if ((c >= 0x40 && c <= 0x7E) || c == ';') {
int i, row, col, amount;
bool* flag;
/* At most 16 parameters */
if (argc < 16) {
/* Finish parameter */
argv_buffer[argv_length] = 0;
argv[argc++] = guac_terminal_parse_numeric_param(argv_buffer);
/* Prepare for next parameter */
argv_length = 0;
}
/* Handle CSI functions */
switch (c) {
/* @: Insert characters (scroll right) */
case '@':
amount = argv[0];
if (amount == 0) amount = 1;
/* Scroll right by amount */
if (term->cursor_col + amount < term->term_width)
guac_terminal_copy_columns(term, term->cursor_row,
term->cursor_col, term->term_width - amount - 1,
amount);
/* Clear left */
guac_terminal_clear_columns(term, term->cursor_row,
term->cursor_col, term->cursor_col + amount - 1);
break;
/* A: Move up */
case 'A':
/* Get move amount */
amount = argv[0];
if (amount == 0) amount = 1;
/* Move cursor */
guac_terminal_move_cursor(term,
term->cursor_row - amount,
term->cursor_col);
break;
/* B: Move down */
case 'e':
case 'B':
/* Get move amount */
amount = argv[0];
if (amount == 0) amount = 1;
/* Move cursor */
guac_terminal_move_cursor(term,
term->cursor_row + amount,
term->cursor_col);
break;
/* C: Move right */
case 'a':
case 'C':
/* Get move amount */
amount = argv[0];
if (amount == 0) amount = 1;
/* Move cursor */
guac_terminal_move_cursor(term,
term->cursor_row,
term->cursor_col + amount);
break;
/* D: Move left */
case 'D':
/* Get move amount */
amount = argv[0];
if (amount == 0) amount = 1;
/* Move cursor */
guac_terminal_move_cursor(term,
term->cursor_row,
term->cursor_col - amount);
break;
/* E: Move cursor down given number rows, column 1 */
case 'E':
/* Get move amount */
amount = argv[0];
if (amount == 0) amount = 1;
/* Move cursor down, reset to column 1 */
guac_terminal_move_cursor(term,
term->cursor_row + amount,
0);
break;
/* F: Move cursor up given number rows, column 1 */
case 'F':
/* Get move amount */
amount = argv[0];
if (amount == 0) amount = 1;
/* Move cursor up , reset to column 1 */
guac_terminal_move_cursor(term,
term->cursor_row - amount,
0);
break;
/* G: Move cursor, current row */
case '`':
case 'G':
col = argv[0]; if (col != 0) col--;
guac_terminal_move_cursor(term, term->cursor_row, col);
break;
/* H: Move cursor */
case 'f':
case 'H':
row = argv[0]; if (row != 0) row--;
col = argv[1]; if (col != 0) col--;
guac_terminal_move_cursor(term, row, col);
break;
/* J: Erase display */
case 'J':
/* Erase from cursor to end of display */
if (argv[0] == 0)
guac_terminal_clear_range(term,
term->cursor_row, term->cursor_col,
term->term_height-1, term->term_width-1);
/* Erase from start to cursor */
else if (argv[0] == 1)
guac_terminal_clear_range(term,
0, 0,
term->cursor_row, term->cursor_col);
/* Entire screen */
else if (argv[0] == 2 || argv[0] == 3)
guac_terminal_clear_range(term,
0, 0, term->term_height - 1, term->term_width - 1);
break;
/* K: Erase line */
case 'K':
/* Erase from cursor to end of line */
if (argv[0] == 0)
guac_terminal_clear_columns(term, term->cursor_row,
term->cursor_col, term->term_width - 1);
/* Erase from start to cursor */
else if (argv[0] == 1)
guac_terminal_clear_columns(term, term->cursor_row,
0, term->cursor_col);
/* Erase line */
else if (argv[0] == 2)
guac_terminal_clear_columns(term, term->cursor_row,
0, term->term_width - 1);
break;
/* L: Insert blank lines (scroll down) */
case 'L':
amount = argv[0];
if (amount == 0) amount = 1;
guac_terminal_scroll_down(term,
term->cursor_row, term->scroll_end, amount);
break;
/* M: Delete lines (scroll up) */
case 'M':
amount = argv[0];
if (amount == 0) amount = 1;
guac_terminal_scroll_up(term,
term->cursor_row, term->scroll_end, amount);
break;
/* P: Delete characters (scroll left) */
case 'P':
amount = argv[0];
if (amount == 0) amount = 1;
/* Scroll left by amount */
if (term->cursor_col + amount < term->term_width)
guac_terminal_copy_columns(term, term->cursor_row,
term->cursor_col + amount, term->term_width - 1,
-amount);
/* Clear right */
guac_terminal_clear_columns(term, term->cursor_row,
term->term_width - amount, term->term_width - 1);
break;
/* S: Scroll Up by amount */
case 'S':
/* Get move amount */
amount = argv[0];
if (amount == 0) amount = 1;
/* Scroll up */
guac_terminal_scroll_up(term, term->scroll_start,
term->scroll_end, amount);
break;
/* T: Scroll Down by amount */
case 'T':
/* Get move amount */
amount = argv[0];
if (amount == 0) amount = 1;
/* Scroll Down */
guac_terminal_scroll_down(term, term->scroll_start,
term->scroll_end, amount);
break;
/* X: Erase characters (no scroll) */
case 'X':
amount = argv[0];
if (amount == 0) amount = 1;
/* Clear characters */
guac_terminal_clear_columns(term, term->cursor_row,
term->cursor_col, term->cursor_col + amount - 1);
break;
/* ]: Linux Private CSI */
case ']':
/* Explicitly ignored */
break;
/* c: Identify */
case 'c':
if (argv[0] == 0 && private_mode_character == 0)
guac_terminal_send_string(term, GUAC_TERMINAL_VT102_ID);
break;
/* d: Move cursor, current col */
case 'd':
row = argv[0]; if (row != 0) row--;
guac_terminal_move_cursor(term, row, term->cursor_col);
break;
/* g: Clear tab */
case 'g':
/* Clear tab at current location */
if (argv[0] == 0)
guac_terminal_unset_tab(term, term->cursor_col);
/* Clear all tabs */
else if (argv[0] == 3)
guac_terminal_clear_tabs(term);
break;
/* h: Set Mode (DECSET) */
case 'h':
/* Save cursor for later restoration */
if (argv[0] == GUAC_TERMINAL_DECSET_SAVE_CURSOR
|| argv[0] == GUAC_TERMINAL_DECSET_USE_ALT_BUFFER_AND_SAVE_CURSOR_AND_CLEAR) {
term->saved_cursor_row = term->cursor_row;
term->saved_cursor_col = term->cursor_col;
}
if (term->current_buffer != term->alternate_buffer) {
/* Switch to alternate buffer */
if (argv[0] == GUAC_TERMINAL_DECSET_USE_ALT_BUFFER
|| argv[0] == GUAC_TERMINAL_DECSET_USE_ALT_BUFFER_AND_CLEAR
|| argv[0] == GUAC_TERMINAL_DECSET_USE_ALT_BUFFER_AND_SAVE_CURSOR_AND_CLEAR) {
term->current_buffer = term->alternate_buffer;
/* Update scrollbar bounds (the different buffers have differing levels of scrollback) */
guac_terminal_scrollbar_set_bounds(term->scrollbar,
-guac_terminal_get_available_scroll(term), 0);
}
/* Clear alternate buffer only if we were previously using
* the normal buffer */
if (argv[0] == GUAC_TERMINAL_DECSET_USE_ALT_BUFFER_AND_CLEAR
|| argv[0] == GUAC_TERMINAL_DECSET_USE_ALT_BUFFER_AND_SAVE_CURSOR_AND_CLEAR) {
guac_terminal_clear_range(term,
0, 0, term->term_height - 1, term->term_width - 1);
}
}
/* Look up flag and set */
flag = __guac_terminal_get_flag(term, argv[0], private_mode_character);
if (flag != NULL)
*flag = true;
break;
/* l: Reset Mode (DECRST) */
case 'l':
if (term->current_buffer != term->normal_buffer) {
/* Switch back to normal buffer */
if (argv[0] == GUAC_TERMINAL_DECRST_USE_NORMAL_BUFFER
|| argv[0] == GUAC_TERMINAL_DECRST_USE_NORMAL_BUFFER_AND_CLEAR
|| argv[0] == GUAC_TERMINAL_DECRST_USE_NORMAL_BUFFER_AND_RESTORE_CURSOR) {
term->current_buffer = term->normal_buffer;
/* Update scrollbar bounds (the different buffers have differing levels of scrollback) */
guac_terminal_scrollbar_set_bounds(term->scrollbar,
-guac_terminal_get_available_scroll(term), 0);
/* Redraw normal buffer content */
guac_terminal_redraw_default_layer(term);
/* Clear selection */
term->text_selected = false;
term->selection_committed = false;
}
/* Clear normal buffer only if we were previously using
* the alternate buffer */
if (argv[0] == GUAC_TERMINAL_DECRST_USE_NORMAL_BUFFER_AND_CLEAR) {
guac_terminal_clear_range(term,
0, 0, term->term_height - 1, term->term_width - 1);
}
}
/* Restore previously saved cursor */
if (argv[0] == GUAC_TERMINAL_DECRST_RESTORE_CURSOR
|| argv[0] == GUAC_TERMINAL_DECRST_USE_NORMAL_BUFFER_AND_RESTORE_CURSOR) {
guac_terminal_move_cursor(term,
term->saved_cursor_row,
term->saved_cursor_col);
}
/* Look up flag and clear */
flag = __guac_terminal_get_flag(term, argv[0], private_mode_character);
if (flag != NULL)
*flag = false;
break;
/* m: Set graphics rendition */
case 'm':
for (i=0; i<argc; i++) {
int value = argv[i];
/* Reset attributes */
if (value == 0)
term->current_attributes = term->default_char.attributes;
/* Bold */
else if (value == 1)
term->current_attributes.bold = true;
/* Faint (low intensity) */
else if (value == 2)
term->current_attributes.half_bright = true;
/* Underscore on */
else if (value == 4)
term->current_attributes.underscore = true;
/* Reverse video */
else if (value == 7)
term->current_attributes.reverse = true;
/* Normal intensity (not bold) */
else if (value == 21 || value == 22) {
term->current_attributes.bold = false;
term->current_attributes.half_bright = false;
}
/* Reset underscore */
else if (value == 24)
term->current_attributes.underscore = false;
/* Reset reverse video */
else if (value == 27)
term->current_attributes.reverse = false;
/* Foreground */
else if (value >= 30 && value <= 37)
guac_terminal_display_lookup_color(term->display,
value - 30,
&term->current_attributes.foreground);
/* Underscore on, default foreground OR 256-color
* foreground */
else if (value == 38) {
/* Attempt to set foreground with 256-color entry */
int xterm256_length =
guac_terminal_parse_xterm256(term,
argc - i - 1, &argv[i + 1],
&term->current_attributes.foreground);
/* If valid 256-color entry, foreground has been set */
if (xterm256_length > 0)
i += xterm256_length;
/* Otherwise interpret as underscore and default
* foreground */
else {
term->current_attributes.underscore = true;
term->current_attributes.foreground =
term->default_char.attributes.foreground;
}
}
/* Underscore off, default foreground */
else if (value == 39) {
term->current_attributes.underscore = false;
term->current_attributes.foreground =
term->default_char.attributes.foreground;
}
/* Background */
else if (value >= 40 && value <= 47)
guac_terminal_display_lookup_color(term->display,
value - 40,
&term->current_attributes.background);
/* 256-color background */
else if (value == 48)
i += guac_terminal_parse_xterm256(term,
argc - i - 1, &argv[i + 1],
&term->current_attributes.background);
/* Reset background */
else if (value == 49)
term->current_attributes.background =
term->default_char.attributes.background;
/* Intense foreground */
else if (value >= 90 && value <= 97)
guac_terminal_display_lookup_color(term->display,
value - 90 + GUAC_TERMINAL_FIRST_INTENSE,
&term->current_attributes.foreground);
/* Intense background */
else if (value >= 100 && value <= 107)
guac_terminal_display_lookup_color(term->display,
value - 100 + GUAC_TERMINAL_FIRST_INTENSE,
&term->current_attributes.background);
}
break;
/* n: Status report */
case 'n':
/* Device status report */
if (argv[0] == 5 && private_mode_character == 0)
guac_terminal_send_string(term, GUAC_TERMINAL_OK);
/* Cursor position report */
else if (argv[0] == 6 && private_mode_character == 0)
guac_terminal_sendf(term, "\x1B[%i;%iR", term->cursor_row+1, term->cursor_col+1);
break;
/* q: Set keyboard LEDs */
case 'q':
/* Explicitly ignored */
break;
/* r: Set scrolling region */
case 'r':
/* If parameters given, set region */
if (argc == 2) {
term->scroll_start = argv[0]-1;
term->scroll_end = argv[1]-1;
}
/* Otherwise, reset scrolling region */
else {
term->scroll_start = 0;
term->scroll_end = term->term_height - 1;
}
break;
/* Save Cursor */
case 's':
term->saved_cursor_row = term->cursor_row;
term->saved_cursor_col = term->cursor_col;
break;
/* Restore Cursor */
case 'u':
guac_terminal_move_cursor(term,
term->saved_cursor_row,
term->saved_cursor_col);
break;
/* Warn of unhandled codes */
default:
if (c != ';') {
guac_client_log(term->client, GUAC_LOG_DEBUG,
"Unhandled CSI sequence: %c", c);
for (i=0; i<argc; i++)
guac_client_log(term->client, GUAC_LOG_DEBUG,
" -> argv[%i] = %i", i, argv[i]);
}
}
/* If not a semicolon, end of CSI sequence */
if (c != ';') {
term->char_handler = guac_terminal_echo;
/* Reset parameters */
for (i=0; i<argc; i++)
argv[i] = 0;
/* Reset private mode character */
private_mode_character = 0;
/* Reset argument counters */
argc = 0;
argv_length = 0;
}
}
/* Set private mode character if given and unset */
else if (c >= 0x3A && c <= 0x3F && private_mode_character == 0)
private_mode_character = c;
return 0;
}