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

/*
 * Copyright (C) 2013 Glyptodon LLC
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "config.h"
#include "guac_io.h"

#include <unistd.h>

int guac_common_write(int fd, void* buffer, int length) {
    
    unsigned char* bytes = (unsigned char*) buffer;

    while (length > 0) {

        /* Attempt write */
        int bytes_written = write(fd, bytes, length);
        if (bytes_written < 0)
            return bytes_written;

        /* Update buffer */
        length -= bytes_written;
        bytes += bytes_written;

    }

    /* Success */
    return length;

}

int guac_common_read(int fd, void* buffer, int length) {

    unsigned char* bytes = (unsigned char*) buffer;

    while (length > 0) {

        /* Attempt read */
        int bytes_read = read(fd, bytes, length);
        if (bytes_read < 0)
            return bytes_read;

        /* Update buffer */
        length -= bytes_read;
        bytes += bytes_read;

    }

    /* Success */
    return length;

}