ossp-pkg/l2/l2_ch_buffer.c
1.4
/*
** L2 - OSSP Logging Library
** Copyright (c) 2001 The OSSP Project (http://www.ossp.org/)
** Copyright (c) 2001 Cable & Wireless Deutschland (http://www.cw.com/de/)
**
** This file is part of OSSP L2, a flexible logging library which
** can be found at http://www.ossp.com/pkg/l2/.
**
** Permission to use, copy, modify, and distribute this software for
** any purpose with or without fee is hereby granted, provided that
** the above copyright notice and this permission notice appear in all
** copies.
**
** THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHORS AND COPYRIGHT HOLDERS AND THEIR
** CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
** USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
** ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
** OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
** OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
** SUCH DAMAGE.
**
** l2_ch_buffer.c: buffering channel implementation
*/
#include "l2.h"
#include "l2_p.h"
#include <string.h>
typedef struct {
char *buf;
int bufpos;
int bufsize;
} l2_ch_buffer_t;
static int hook_create(l2_context_t *ctx)
{
l2_ch_buffer_t *cfg;
if ((cfg = (l2_ch_buffer_t *)malloc(sizeof(l2_ch_buffer_t))) == NULL)
return L2_ERROR;
cfg->buf = NULL;
cfg->bufpos = 0;
cfg->bufsize = 4096;
ctx->vp = cfg;
return L2_OK;
}
static int hook_configure(l2_context_t *ctx, const char *fmt, va_list ap)
{
l2_ch_buffer_t *cfg;
l2_param_t pa[3];
l2_result_t rv;
if ((cfg = (l2_ch_buffer_t *)ctx->vp) == NULL)
return L2_ERROR;
L2_PARAM_SET(pa[0], size, INT, &cfg->bufsize);
L2_PARAM_END(pa[2]);
rv = l2_channel_setparams(pa, fmt, ap);
if (cfg->bufsize < 0)
return L2_ERROR;
return rv;
}
static int hook_open(l2_context_t *ctx, l2_channel_t *downstream)
{
l2_ch_buffer_t *cfg;
if ((cfg = (l2_ch_buffer_t *)ctx->vp) == NULL)
return L2_ERROR;
if (cfg->bufsize > 0) {
if ((cfg->buf = malloc(cfg->bufsize)) == NULL)
return L2_ERROR;
cfg->bufpos = 0;
}
if (downstream != NULL)
if (l2_channel_open(downstream) == L2_ERROR)
return L2_ERROR;
return L2_OK;
}
static int hook_write(l2_context_t *ctx, l2_channel_t *downstream,
const char *buf, size_t bufsize)
{
l2_ch_buffer_t *cfg;
if ((cfg = (l2_ch_buffer_t *)ctx->vp) == NULL)
return L2_ERROR;
if (bufsize > (cfg->bufsize - cfg->bufpos)) {
if (downstream != NULL)
if (l2_channel_write(downstream, cfg->buf, cfg->bufpos) == L2_ERROR)
return L2_ERROR;
cfg->bufpos = 0;
}
memcpy(cfg->buf+cfg->bufpos, buf, bufsize);
cfg->bufpos += bufsize;
return L2_OK;
}
static int hook_flush(l2_context_t *ctx, l2_channel_t *downstream)
{
l2_ch_buffer_t *cfg;
if ((cfg = (l2_ch_buffer_t *)ctx->vp) == NULL)
return L2_ERROR;
if (cfg->bufpos > 0) {
if (downstream != NULL)
if (l2_channel_write(downstream, cfg->buf, cfg->bufpos) == L2_ERROR)
return L2_ERROR;
cfg->bufpos = 0;
}
if (downstream != NULL)
if (l2_channel_flush(downstream) == L2_ERROR)
return L2_ERROR;
return L2_OK;
}
static int hook_close(l2_context_t *ctx, l2_channel_t *downstream)
{
l2_ch_buffer_t *cfg;
if (downstream != NULL)
if (l2_channel_close(downstream) == L2_ERROR)
return L2_ERROR;
if ((cfg = (l2_ch_buffer_t *)ctx->vp) == NULL)
return L2_ERROR;
if (cfg->buf != NULL) {
free(cfg->buf);
cfg->buf = NULL;
}
return L2_OK;
}
static int hook_destroy(l2_context_t *ctx)
{
l2_ch_buffer_t *cfg;
if ((cfg = (l2_ch_buffer_t *)ctx->vp) == NULL)
return L2_ERROR;
if (cfg->buf != NULL)
free(cfg->buf);
free(cfg);
return L2_OK;
}
l2_handler_t l2_handler_buffer = {
hook_create,
hook_configure,
hook_open,
hook_write,
hook_flush,
hook_close,
hook_destroy
};