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/* $Id$ */
/***
This file is part of polypaudio.
polypaudio 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.
polypaudio 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 polypaudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <errno.h>
#include <stdio.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "ioline.h"
#include "xmalloc.h"
#define BUFFER_LIMIT (64*1024)
#define READ_SIZE (1024)
struct pa_ioline {
struct pa_iochannel *io;
int dead;
char *wbuf;
size_t wbuf_length, wbuf_index, wbuf_valid_length;
char *rbuf;
size_t rbuf_length, rbuf_index, rbuf_valid_length;
void (*callback)(struct pa_ioline*io, const char *s, void *userdata);
void *userdata;
};
static void io_callback(struct pa_iochannel*io, void *userdata);
static int do_write(struct pa_ioline *l);
struct pa_ioline* pa_ioline_new(struct pa_iochannel *io) {
struct pa_ioline *l;
assert(io);
l = pa_xmalloc(sizeof(struct pa_ioline));
l->io = io;
l->dead = 0;
l->wbuf = NULL;
l->wbuf_length = l->wbuf_index = l->wbuf_valid_length = 0;
l->rbuf = NULL;
l->rbuf_length = l->rbuf_index = l->rbuf_valid_length = 0;
l->callback = NULL;
l->userdata = NULL;
pa_iochannel_set_callback(io, io_callback, l);
return l;
}
void pa_ioline_free(struct pa_ioline *l) {
assert(l);
pa_iochannel_free(l->io);
pa_xfree(l->wbuf);
pa_xfree(l->rbuf);
pa_xfree(l);
}
void pa_ioline_puts(struct pa_ioline *l, const char *c) {
size_t len;
assert(l && c);
len = strlen(c);
if (len > BUFFER_LIMIT - l->wbuf_valid_length)
len = BUFFER_LIMIT - l->wbuf_valid_length;
if (!len)
return;
if (len > l->wbuf_length - l->wbuf_valid_length) {
size_t n = l->wbuf_valid_length+len;
char *new = pa_xmalloc(n);
if (l->wbuf) {
memcpy(new, l->wbuf+l->wbuf_index, l->wbuf_valid_length);
pa_xfree(l->wbuf);
}
l->wbuf = new;
l->wbuf_length = n;
l->wbuf_index = 0;
} else if (len > l->wbuf_length - l->wbuf_valid_length - l->wbuf_index) {
memmove(l->wbuf, l->wbuf+l->wbuf_index, l->wbuf_valid_length);
l->wbuf_index = 0;
}
memcpy(l->wbuf+l->wbuf_index+l->wbuf_valid_length, c, len);
l->wbuf_valid_length += len;
do_write(l);
}
void pa_ioline_set_callback(struct pa_ioline*l, void (*callback)(struct pa_ioline*io, const char *s, void *userdata), void *userdata) {
assert(l && callback);
l->callback = callback;
l->userdata = userdata;
}
static int do_read(struct pa_ioline *l) {
ssize_t r;
size_t m, len;
char *e;
assert(l);
if (!pa_iochannel_is_readable(l->io))
return 0;
len = l->rbuf_length - l->rbuf_index - l->rbuf_valid_length;
if (len < READ_SIZE) {
size_t n = l->rbuf_valid_length+READ_SIZE;
if (n >= BUFFER_LIMIT)
n = BUFFER_LIMIT;
if (l->rbuf_length >= n) {
if (l->rbuf_valid_length)
memmove(l->rbuf, l->rbuf+l->rbuf_index, l->rbuf_valid_length);
} else {
char *new = pa_xmalloc(n);
if (l->rbuf_valid_length)
memcpy(new, l->rbuf+l->rbuf_index, l->rbuf_valid_length);
pa_xfree(l->rbuf);
l->rbuf = new;
l->rbuf_length = n;
}
l->rbuf_index = 0;
}
len = l->rbuf_length - l->rbuf_index - l->rbuf_valid_length;
if ((r = pa_iochannel_read(l->io, l->rbuf+l->rbuf_index+l->rbuf_valid_length, len)) <= 0)
return -1;
e = memchr(l->rbuf+l->rbuf_index+l->rbuf_valid_length, '\n', r);
l->rbuf_valid_length += r;
if (!e &&l->rbuf_valid_length >= BUFFER_LIMIT)
e = l->rbuf+BUFFER_LIMIT-1;
if (e) {
char *p;
*e = 0;
p = l->rbuf+l->rbuf_index;
m = strlen(p);
l->rbuf_index += m+1;
l->rbuf_valid_length -= m+1;
if (l->rbuf_valid_length == 0)
l->rbuf_index = 0;
if (l->callback)
l->callback(l, p, l->userdata);
}
return 0;
}
static int do_write(struct pa_ioline *l) {
ssize_t r;
assert(l);
if (!l->wbuf_valid_length || !pa_iochannel_is_writable(l->io))
return 0;
if ((r = pa_iochannel_write(l->io, l->wbuf+l->wbuf_index, l->wbuf_valid_length)) < 0)
return -1;
l->wbuf_valid_length -= r;
if (l->wbuf_valid_length == 0)
l->wbuf_index = 0;
return 0;
}
static void io_callback(struct pa_iochannel*io, void *userdata) {
struct pa_ioline *l = userdata;
assert(io && l);
if (!l->dead && do_write(l) < 0)
goto fail;
if (!l->dead && do_read(l) < 0)
goto fail;
return;
fail:
l->dead = 1;
if (l->callback)
l->callback(l, NULL, l->userdata);
}
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