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/*
* Venus GPS Server
*
* Copyright (C) 2010 by Multi-Tech Systems
*
* Author: James Maki <jmaki@multitech.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "log.h"
#include "cbuffer.h"
#include "utils.h"
#include <errno.h>
int buffered_write(int fd, struct cbuffer *buf)
{
int i;
int len;
int count = buffer_used(buf);
int total = 0;
i = buf->read_index;
if (i + count > buffer_size(buf)) {
len = full_write(fd, buf->buffer + i, buffer_size(buf) - i);
if (len <= 0) {
log_error("full_write failed %m");
return len;
}
total += len;
count -= len;
if (len < buffer_size(buf) - i) {
buf->read_index = i + len;
return total;
}
i = 0;
}
len = full_write(fd, buf->buffer + i, count);
if (len <= 0) {
if (total) {
return total;
} else {
log_error("full_write failed %m");
return len;
}
}
buf->read_index = i + len;
total += len;
return total;
}
int buffered_read(int fd, struct cbuffer *buf)
{
int i;
int len;
int count = buffer_free(buf);
int total = 0;
i = buf->write_index;
if (i + count > buffer_size(buf)) {
len = safe_read(fd, buf->buffer + i, buffer_size(buf) - i);
if (len <= 0) {
log_warning("safe_read failed %m");
return len;
}
total += len;
count -= len;
if (len < buffer_size(buf) - i) {
buf->write_index = i + len;
return total;
}
i = 0;
}
len = safe_read(fd, buf->buffer + i, count);
if (len <= 0) {
if (total) {
return total;
} else {
log_warning("safe_read failed %m");
return len;
}
}
buf->write_index = i + len;
total += len;
return total;
}
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