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