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labcomm_fd_writer.c 3.65 KiB
/*
labcomm_fd_writer.c -- LabComm writer for Unix file descriptors.
Copyright 2006-2013 Anders Blomdell <anders.blomdell@control.lth.se>
This file is part of LabComm.
LabComm 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 3 of the License, or
(at your option) any later version.
LabComm 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, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include "labcomm_private.h"
#include "labcomm_fd_writer.h"
#define BUFFER_SIZE 2048
struct labcomm_fd_writer {
struct labcomm_writer writer;
struct labcomm_writer_action_context action_context;
int fd;
int close_fd_on_free;
};
static int fd_flush(struct labcomm_writer *w,
struct labcomm_writer_action_context *action_context);
static int fd_alloc(struct labcomm_writer *w,
struct labcomm_writer_action_context *action_context,
char *version)
{
w->data = labcomm_memory_alloc(w->memory, 0, BUFFER_SIZE);
if (! w->data) {
w->error = -ENOMEM;
w->data_size = 0;
w->count = 0;
w->pos = 0;
} else {
w->data_size = BUFFER_SIZE;
w->count = BUFFER_SIZE;
w->pos = 0;
if (version && version[0]) {
labcomm_write_string(w, version);
fd_flush(w, action_context);
}
}
return w->error;
}
static int fd_free(struct labcomm_writer *w,
struct labcomm_writer_action_context *action_context)
{
struct labcomm_fd_writer *fd_writer = action_context->context;
struct labcomm_memory *memory = w->memory;