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plugin-logging.c
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plugin-logging.c
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/** @file plugin-logging.c
*
* mce-plugin-libhybris - Libhybris plugin for Mode Control Entity
* <p>
* Copyright (C) 2013-2017 Jolla Ltd.
* <p>
* @author Simo Piiroinen <[email protected]>
*
* mce-plugin-libhybris is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License.
*
* mce-plugin-libhybris 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with mce-plugin-libhybris; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "plugin-logging.h"
#include "plugin-api.h"
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
/* ========================================================================= *
* PROTOTYPES
* ========================================================================= */
void mce_hybris_set_log_hook(mce_hybris_log_fn cb);
void mce_hybris_log (int lev, const char *file, const char *func, const char *fmt, ...);
/* ========================================================================= *
* DATA
* ========================================================================= */
/** Callback function for diagnostic output, or NULL for stderr output */
static mce_hybris_log_fn mce_hybris_log_cb = 0;
/* ========================================================================= *
* FUNCTIONS
* ========================================================================= */
/** Set diagnostic output forwarding callback
*
* @param cb The callback function to use, or NULL for stderr output
*/
void
mce_hybris_set_log_hook(mce_hybris_log_fn cb)
{
mce_hybris_log_cb = cb;
}
/** Wrapper for diagnostic logging
*
* @param lev syslog priority (=mce_log level) i.e. LL_ERR etc
* @param file source code path
* @param func name of function within file
* @param fmt printf compatible format string
* @param ... parameters required by the format string
*/
void
mce_hybris_log(int lev, const char *file, const char *func,
const char *fmt, ...)
{
char *msg = 0;
va_list va;
va_start(va, fmt);
if( vasprintf(&msg, fmt, va) < 0 ) msg = 0;
va_end(va);
if( msg ) {
if( mce_hybris_log_cb ) {
mce_hybris_log_cb(lev, file, func, msg);
}
else {
fprintf(stderr, "%s: %s: %s\n", file, func, msg);
}
free(msg);
}
}