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/* This file is part of Smap.
Copyright (C) 2006-2007, 2010, 2014 Sergey Poznyakoff
Smap 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.
Smap 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 Smap. If not, see <http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "smap/stream.h"
#include "smap/streamdef.h"
struct tracepfx {
char *str;
size_t len;
};
struct trace_stream {
struct _smap_stream base;
struct tracepfx *pfxv;
size_t pfxc;
smap_stream_t transport;
};
static const char *
find_resp_marker(const char *buf, size_t size)
{
while (size) {
const char *p = memchr(buf, '=', size);
if (!p)
return NULL;
if (p[1] == '>') {
for (p += 2; *p && (*p == ' ' || *p == '\t'); p++)
;
return p;
}
size -= p - buf + 1;
buf = p + 1;
}
return NULL;
}
static void
_trace_free_pfx(struct trace_stream *tp)
{
size_t i;
for (i = 0; i < tp->pfxc; i++)
free(tp->pfxv[i].str);
free(tp->pfxv);
tp->pfxc = 0;
tp->pfxv = NULL;
}
static int
_trace_new_pfx(struct trace_stream *tp, char **args)
{
size_t i, count;
for (i = 0; args[i]; i++)
;
count = i;
tp->pfxv = calloc(count, sizeof(tp->pfxv[0]));
if (!tp->pfxv)
return errno;
for (i = 0; i < count; i++) {
if (!(tp->pfxv[i].str = strdup(args[i]))) {
tp->pfxc = i;
_trace_free_pfx(tp);
return ENOMEM;
}
tp->pfxv[i].len = strlen(args[i]);
}
tp->pfxc = count;
return 0;
}
static int
match_response(struct trace_stream *tp, const char *resp, size_t len)
{
size_t i;
for (i = 0; i < tp->pfxc; i++) {
if (tp->pfxv[i].len <= len
&& memcmp(resp, tp->pfxv[i].str, tp->pfxv[i].len) == 0)
return 1;
}
return 0;
}
static int
_trace_write(struct _smap_stream *stream, const char *buf,
size_t size, size_t *pret)
{
struct trace_stream *tp = (struct trace_stream *) stream;
const char *p;
if (tp->pfxc
&& (p = find_resp_marker(buf, size))
&& !match_response(tp, p, size - (p - buf))) {
*pret = size;
return 0;
}
return smap_stream_write(tp->transport, buf, size, pret);
}
static int
_trace_close(struct _smap_stream *stream)
{
struct trace_stream *tp = (struct trace_stream *) stream;
if (stream->flags & SMAP_STREAM_NO_CLOSE)
return 0;
return smap_stream_close(tp->transport);
}
static int
_trace_ioctl(struct _smap_stream *stream, int code, void *ptr)
{
struct trace_stream *sp = (struct trace_stream *) stream;
smap_transport_t (*optrans)[2], *iptrans;
switch (code) {
case SMAP_IOCTL_GET_TRANSPORT:
if (!ptr)
return EINVAL;
optrans = ptr;
(*optrans)[0] = (smap_transport_t) sp->transport;
(*optrans)[1] = NULL;
break;
case SMAP_IOCTL_SET_TRANSPORT:
if (!ptr)
return EINVAL;
iptrans = ptr;
sp->transport = (smap_stream_t)iptrans[0];
break;
case SMAP_IOCTL_SET_ARGS:
if (!ptr)
return EINVAL;
_trace_free_pfx(sp);
_trace_new_pfx(sp, (char**)ptr);
break;
default:
return EINVAL;
}
return 0;
}
static void
_trace_destroy(struct _smap_stream *stream)
{
struct trace_stream *tp = (struct trace_stream *) stream;
if (!(stream->flags & SMAP_STREAM_NO_CLOSE))
smap_stream_destroy(&tp->transport);
_trace_free_pfx(tp);
}
static int
_trace_flush(struct _smap_stream *stream)
{
struct trace_stream *p = (struct trace_stream *)stream;
if (!p->transport)
return 0;
return smap_stream_flush(p->transport);
}
int
smap_trace_stream_create(smap_stream_t *pstream, smap_stream_t transport)
{
struct trace_stream *p;
smap_stream_t stream;
p = (struct trace_stream *)
_smap_stream_create(sizeof(*p), SMAP_STREAM_WRITE);
p->transport = transport;
p->base.write = _trace_write;
p->base.flush = _trace_flush;
p->base.close = _trace_close;
p->base.done = _trace_destroy;
p->base.ctl = _trace_ioctl;
stream = (smap_stream_t)p;
smap_stream_set_buffer(stream, smap_buffer_line, 1024);
*pstream = stream;
return 0;
}
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