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/* This file is part of GNU Dico.
Copyright (C) 2012-2019 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 <libi18n.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
enum crlf_state
{
state_init,
state_cr
};
struct _crlfstr {
dico_stream_t transport;
int noclose;
enum crlf_state state;
char cb;
};
static int
_crlfstr_write(void *data, const char *buf, size_t size, size_t *pret)
{
struct _crlfstr *s = data;
const char *p, *q;
for (p = buf, q = buf + size; p < q; p++) {
switch (*p) {
case '\n':
if (s->state == state_cr)
s->state = state_init;
else {
if (p > buf)
dico_stream_write(s->transport, buf, p - buf);
dico_stream_write(s->transport, "\r\n", 2);
buf = p + 1;
}
break;
case '\r':
s->state = state_cr;
break;
default:
s->state = state_init;
}
}
if (p > buf)
dico_stream_write(s->transport, buf, p - buf);
*pret = size;
return 0;
}
static int
_crlfstr_read(void *data, char *buf, size_t size, size_t *pret)
{
struct _crlfstr *s = data;
size_t sz = 0;
size_t total = 0;
char *p;
if (s->cb) {
buf[sz++] = s->cb;
s->cb = 0;
}
while (total < size) {
int i;
if (sz == 0) {
int rc = dico_stream_read(s->transport, buf + total, size - total,
&sz);
if (rc)
return rc;
if (sz == 0)
break;
}
p = buf + total;
for (i = 0; i < sz; i++, p++) {
switch (*p) {
case '\r':
if (s->cb)
buf[total++] = s->cb;
s->cb = '\r';
break;
case '\n':
s->cb = 0;
buf[total++] = *p;
break;
default:
if (s->cb) {
buf[total++] = s->cb;
s->cb = 0;
}
if (total == size)
s->cb = *p;
else
buf[total++] = *p;
}
}
sz = 0;
}
*pret = total;
return 0;
}
static int
_crlfstr_destroy(void *data)
{
struct _crlfstr *s = data;
if (!s->noclose)
dico_stream_destroy(&s->transport);
return 0;
}
static int
_crlfstr_flush(void *data)
{
struct _crlfstr *s = data;
return dico_stream_flush(s->transport);
}
static int
_crlfstr_close(void *data)
{
struct _crlfstr *s = data;
if (s->noclose)
return 0;
return dico_stream_close(s->transport);
}
static int
_crlfstr_ioctl(void *data, int code, void *call_data)
{
struct _crlfstr *s = data;
switch (code) {
case DICO_IOCTL_GET_TRANSPORT:
*(dico_stream_t*)call_data = s->transport;
break;
case DICO_IOCTL_SET_TRANSPORT:
s->transport = call_data;
break;
case DICO_IOCTL_BYTES_IN:
*(off_t*)call_data = dico_stream_bytes_in(s->transport);
break;
case DICO_IOCTL_BYTES_OUT:
*(off_t*)call_data = dico_stream_bytes_out(s->transport);
break;
default:
errno = EINVAL;
return -1;
}
return 0;
}
dico_stream_t
dico_crlf_stream(dico_stream_t transport, int flags, int noclose)
{
int rc;
struct _crlfstr *s;
dico_stream_t str;
s = malloc(sizeof(*s));
if (!s)
return NULL;
memset(s, 0, sizeof(*s));
rc = dico_stream_create(&str,
flags & (DICO_STREAM_READ|DICO_STREAM_WRITE), s);
if (rc) {
free(s);
return NULL;
}
s->transport = transport;
s->noclose = noclose;
dico_stream_set_write(str, _crlfstr_write);
dico_stream_set_read(str, _crlfstr_read);
dico_stream_set_flush(str, _crlfstr_flush);
dico_stream_set_close(str, _crlfstr_close);
dico_stream_set_destroy(str, _crlfstr_destroy);
dico_stream_set_ioctl(str, _crlfstr_ioctl);
dico_stream_set_buffer(str, dico_buffer_line, 1024);
return str;
}
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