guacamole-spice-protocol/src/guacenc/instruction-sync.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 "display.h"
#include "log.h"

#include <guacamole/client.h>
#include <guacamole/timestamp.h>

#include <inttypes.h>
#include <stdlib.h>

/**
 * Parses a guac_timestamp from the given string. The string is assumed to
 * consist solely of decimal digits with an optional leading minus sign. If the
 * given string contains other characters, the behavior of this function is
 * undefined.
 *
 * @param str
 *     The string to parse, which must contain only decimal digits and an
 *     optional leading minus sign.
 *
 * @return
 *     A guac_timestamp having the same value as the provided string.
 */
static guac_timestamp guacenc_parse_timestamp(const char* str) {

    int sign = 1;
    int64_t num = 0;

    for (; *str != '\0'; str++) {

        /* Flip sign for each '-' encountered */
        if (*str == '-')
            sign = -sign;

        /* If not '-', assume the character is a digit */
        else
            num = num * 10 + (*str - '0');

    }

    return (guac_timestamp) (num * sign);

}

int guacenc_handle_sync(guacenc_display* display, int argc, char** argv) {

    /* Verify argument count */
    if (argc < 1) {
        guacenc_log(GUAC_LOG_WARNING, "\"sync\" instruction incomplete");
        return 1;
    }

    /* Parse arguments */
    guac_timestamp timestamp = guacenc_parse_timestamp(argv[0]);

    /* Update timestamp / flush frame */
    return guacenc_display_sync(display, timestamp);

}