guacamole-spice-protocol/src/terminal/buffer.c
2016-03-28 20:39:19 -07:00

212 lines
6.1 KiB
C

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
#include "config.h"
#include "buffer.h"
#include "common.h"
#include <stdlib.h>
#include <string.h>
guac_terminal_buffer* guac_terminal_buffer_alloc(int rows, guac_terminal_char* default_character) {
/* Allocate scrollback */
guac_terminal_buffer* buffer =
malloc(sizeof(guac_terminal_buffer));
int i;
guac_terminal_buffer_row* row;
/* Init scrollback data */
buffer->default_character = *default_character;
buffer->available = rows;
buffer->top = 0;
buffer->length = 0;
buffer->rows = malloc(sizeof(guac_terminal_buffer_row) *
buffer->available);
/* Init scrollback rows */
row = buffer->rows;
for (i=0; i<rows; i++) {
/* Allocate row */
row->available = 256;
row->length = 0;
row->characters = malloc(sizeof(guac_terminal_char) * row->available);
/* Next row */
row++;
}
return buffer;
}
void guac_terminal_buffer_free(guac_terminal_buffer* buffer) {
int i;
guac_terminal_buffer_row* row = buffer->rows;
/* Free all rows */
for (i=0; i<buffer->available; i++) {
free(row->characters);
row++;
}
/* Free actual buffer */
free(buffer->rows);
free(buffer);
}
guac_terminal_buffer_row* guac_terminal_buffer_get_row(guac_terminal_buffer* buffer, int row, int width) {
int i;
guac_terminal_char* first;
guac_terminal_buffer_row* buffer_row;
/* Calculate scrollback row index */
int index = buffer->top + row;
if (index < 0)
index += buffer->available;
else if (index >= buffer->available)
index -= buffer->available;
/* Get row */
buffer_row = &(buffer->rows[index]);
/* If resizing is needed */
if (width >= buffer_row->length) {
/* Expand if necessary */
if (width > buffer_row->available) {
buffer_row->available = width*2;
buffer_row->characters = realloc(buffer_row->characters, sizeof(guac_terminal_char) * buffer_row->available);
}
/* Initialize new part of row */
first = &(buffer_row->characters[buffer_row->length]);
for (i=buffer_row->length; i<width; i++)
*(first++) = buffer->default_character;
buffer_row->length = width;
}
/* Return found row */
return buffer_row;
}
void guac_terminal_buffer_copy_columns(guac_terminal_buffer* buffer, int row,
int start_column, int end_column, int offset) {
guac_terminal_char* src;
guac_terminal_char* dst;
/* Get row */
guac_terminal_buffer_row* buffer_row = guac_terminal_buffer_get_row(buffer, row, end_column + offset + 1);
/* Fit range within bounds */
start_column = guac_terminal_fit_to_range(start_column, 0, buffer_row->length - 1);
end_column = guac_terminal_fit_to_range(end_column, 0, buffer_row->length - 1);
start_column = guac_terminal_fit_to_range(start_column + offset, 0, buffer_row->length - 1) - offset;
end_column = guac_terminal_fit_to_range(end_column + offset, 0, buffer_row->length - 1) - offset;
/* Determine source and destination locations */
src = &(buffer_row->characters[start_column]);
dst = &(buffer_row->characters[start_column + offset]);
/* Copy data */
memmove(dst, src, sizeof(guac_terminal_char) * (end_column - start_column + 1));
}
void guac_terminal_buffer_copy_rows(guac_terminal_buffer* buffer,
int start_row, int end_row, int offset) {
int i, current_row;
int step;
/* If shifting down, copy in reverse */
if (offset > 0) {
current_row = end_row;
step = -1;
}
/* Otherwise, copy forwards */
else {
current_row = start_row;
step = 1;
}
/* Copy each current_row individually */
for (i = start_row; i <= end_row; i++) {
/* Get source and destination rows */
guac_terminal_buffer_row* src_row = guac_terminal_buffer_get_row(buffer, current_row, 0);
guac_terminal_buffer_row* dst_row = guac_terminal_buffer_get_row(buffer, current_row + offset, src_row->length);
/* Copy data */
memcpy(dst_row->characters, src_row->characters, sizeof(guac_terminal_char) * src_row->length);
dst_row->length = src_row->length;
/* Next current_row */
current_row += step;
}
}
void guac_terminal_buffer_set_columns(guac_terminal_buffer* buffer, int row,
int start_column, int end_column, guac_terminal_char* character) {
int i, j;
guac_terminal_char* current;
/* Build continuation char (for multicolumn characters) */
guac_terminal_char continuation_char;
continuation_char.value = GUAC_CHAR_CONTINUATION;
continuation_char.attributes = character->attributes;
continuation_char.width = 0; /* Not applicable for GUAC_CHAR_CONTINUATION */
/* Get and expand row */
guac_terminal_buffer_row* buffer_row = guac_terminal_buffer_get_row(buffer, row, end_column+1);
/* Set values */
current = &(buffer_row->characters[start_column]);
for (i = start_column; i <= end_column; i += character->width) {
*(current++) = *character;
/* Store any required continuation characters */
for (j=1; j < character->width; j++)
*(current++) = continuation_char;
}
/* Update length depending on row written */
if (character->value != 0 && row >= buffer->length)
buffer->length = row+1;
}