108 lines
2.4 KiB
C
108 lines
2.4 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 "types.h"
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#include <stdbool.h>
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#include <unistd.h>
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int guac_terminal_fit_to_range(int value, int min, int max) {
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if (value < min) return min;
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if (value > max) return max;
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return value;
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}
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int guac_terminal_encode_utf8(int codepoint, char* utf8) {
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int i;
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int mask, bytes;
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/* Determine size and initial byte mask */
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if (codepoint <= 0x007F) {
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mask = 0x00;
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bytes = 1;
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}
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else if (codepoint <= 0x7FF) {
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mask = 0xC0;
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bytes = 2;
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}
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else if (codepoint <= 0xFFFF) {
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mask = 0xE0;
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bytes = 3;
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}
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else if (codepoint <= 0x1FFFFF) {
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mask = 0xF0;
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bytes = 4;
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}
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/* Otherwise, invalid codepoint */
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else {
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*(utf8++) = '?';
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return 1;
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}
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/* Offset buffer by size */
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utf8 += bytes - 1;
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/* Add trailing bytes, if any */
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for (i=1; i<bytes; i++) {
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*(utf8--) = 0x80 | (codepoint & 0x3F);
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codepoint >>= 6;
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}
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/* Set initial byte */
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*utf8 = mask | codepoint;
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/* Done */
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return bytes;
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}
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bool guac_terminal_has_glyph(int codepoint) {
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return
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codepoint != 0
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&& codepoint != ' '
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&& codepoint != GUAC_CHAR_CONTINUATION;
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}
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int guac_terminal_write_all(int fd, const char* buffer, int size) {
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int remaining = size;
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while (remaining > 0) {
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/* Attempt to write data */
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int ret_val = write(fd, buffer, remaining);
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if (ret_val <= 0)
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return -1;
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/* If successful, contine with what data remains (if any) */
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remaining -= ret_val;
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buffer += ret_val;
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}
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return size;
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}
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