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/* This file is part of GNU Dico.
Copyright (C) 2008-2024 Sergey Poznyakoff
GNU Dico 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, or (at your option)
any later version.
GNU Dico 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 GNU Dico. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <dico.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
struct _stream {
int fd;
};
static int
fd_read(void *data, char *buf, size_t size, size_t *pret)
{
struct _stream *p = data;
int n = read(p->fd, buf, size);
if (n == -1)
return errno;
*pret = n;
return 0;
}
static int
fd_write(void *data, const char *buf, size_t size, size_t *pret)
{
struct _stream *p = data;
int n = write(p->fd, (char*) buf, size);
if (n == -1)
return errno;
*pret = n;
return 0;
}
static int
fd_close(void *data)
{
struct _stream *p = data;
if (close(p->fd))
return errno;
return 0;
}
int
fd_seek (void *data, off_t off, int whence, off_t *presult)
{
struct _stream *p = data;
off = lseek(p->fd, off, whence);
if (off < 0)
return errno;
*presult = off;
return 0;
}
int
fd_size (void *data, off_t *psize)
{
struct _stream *p = data;
off_t size = lseek(p->fd, 0, SEEK_END);
if (size < 0)
return errno;
*psize = size;
return 0;
}
int
fd_destroy(void *data)
{
free(data);
return 0;
}
dico_stream_t
dico_fd_stream_create(int fd, int flags, int noclose)
{
int rc;
dico_stream_t str;
struct _stream *s = malloc(sizeof(*s));
if (!s)
return NULL;
rc = dico_stream_create(&str, flags, s);
if (rc) {
free(s);
return NULL;
}
s->fd = fd;
dico_stream_set_seek(str, fd_seek);
dico_stream_set_size(str, fd_size);
dico_stream_set_write(str, fd_write);
dico_stream_set_read(str, fd_read);
if (!noclose)
dico_stream_set_close(str, fd_close);
dico_stream_set_destroy(str, fd_destroy);
return str;
}
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