guacamole-spice-protocol/src/terminal/common.c

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