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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>
struct _linetrimstr {
dico_stream_t transport;
int noclose;
size_t maxlen;
size_t linelen;
};
#define ISWS(c) ((c)==' '||(c)=='\t'||(c)=='\n')
static size_t
_linetrimstr_find_end(struct _linetrimstr *s, const char *buf, size_t size,
size_t *psize)
{
struct utf8_iterator itr;
const char *wordstart = buf;
utf8_iter_init(&itr, (char*)buf, size);
while (!utf8_iter_end_p(&itr)) {
for (; !utf8_iter_end_p(&itr)
&& utf8_iter_isascii(itr) && ISWS(*itr.curptr);
utf8_iter_next(&itr)) {
if (*itr.curptr == '\n')
s->linelen = 0;
else if (++s->linelen >= s->maxlen) {
*psize = wordstart > buf ? wordstart - buf : itr.curptr - buf;
s->linelen = 0;
return 1;
}
}
wordstart = itr.curptr;
for (; !utf8_iter_end_p(&itr)
&& !(utf8_iter_isascii(itr) && ISWS(*itr.curptr));
utf8_iter_next(&itr)) {
if (++s->linelen >= s->maxlen) {
size_t size = itr.string == wordstart ?
itr.curptr - buf : wordstart - itr.string;
s->linelen = 0;
if (size > 0) {
*psize = size;
return 1;
}
}
}
}
*psize = itr.curptr - buf;
return 0;
}
static int
_linetrimstr_write(void *data, const char *buf, size_t size, size_t *pret)
{
struct _linetrimstr *s = data;
size_t len;
int nl;
nl = _linetrimstr_find_end(s, buf, size, &len);
dico_stream_write(s->transport, buf, len);
if (nl)
dico_stream_write(s->transport, "\n", 1);
*pret = len;
return 0;
}
static int
_linetrimstr_destroy(void *data)
{
struct _linetrimstr *s = data;
if (!s->noclose)
dico_stream_destroy(&s->transport);
return 0;
}
static int
_linetrimstr_flush(void *data)
{
struct _linetrimstr *s = data;
return dico_stream_flush(s->transport);
}
static int
_linetrimstr_close(void *data)
{
struct _linetrimstr *s = data;
if (s->noclose)
return 0;
return dico_stream_close(s->transport);
}
static int
_linetrimstr_ioctl(void *data, int code, void *call_data)
{
struct _linetrimstr *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;
case DICO_IOCTL_SET_LINELEN:
s->maxlen = *(size_t*)call_data;
break;
case DICO_IOCTL_GET_LINELEN:
*(size_t*)call_data = s->maxlen;
break;
default:
errno = EINVAL;
return -1;
}
return 0;
}
dico_stream_t
dico_linetrim_stream(dico_stream_t transport, size_t maxlen, int noclose)
{
int rc;
struct _linetrimstr *s;
dico_stream_t str;
s = malloc(sizeof(*s));
if (!s)
return NULL;
memset(s, 0, sizeof(*s));
rc = dico_stream_create(&str, DICO_STREAM_WRITE, s);
if (rc) {
free(s);
return NULL;
}
s->transport = transport;
s->maxlen = maxlen;
s->noclose = noclose;
dico_stream_set_write(str, _linetrimstr_write);
dico_stream_set_flush(str, _linetrimstr_flush);
dico_stream_set_close(str, _linetrimstr_close);
dico_stream_set_destroy(str, _linetrimstr_destroy);
dico_stream_set_ioctl(str, _linetrimstr_ioctl);
dico_stream_set_buffer(str, dico_buffer_line, 1024);
return str;
}
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