Carla/source/includes/lv2/log.h

/*
  Copyright 2012 David Robillard <http://drobilla.net>

  Permission to use, copy, modify, and/or 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 THE AUTHOR DISCLAIMS ALL WARRANTIES
  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

/**
   @defgroup log Log

   Interface for plugins to log via the host; see
   <http://lv2plug.in/ns/ext/log> for details.

   @{
*/

#ifndef LV2_LOG_H
#define LV2_LOG_H

#define LV2_LOG_URI    "http://lv2plug.in/ns/ext/log"
#define LV2_LOG_PREFIX LV2_LOG_URI "#"

#define LV2_LOG__Entry   LV2_LOG_PREFIX "Entry"
#define LV2_LOG__Error   LV2_LOG_PREFIX "Error"
#define LV2_LOG__Note    LV2_LOG_PREFIX "Note"
#define LV2_LOG__Trace   LV2_LOG_PREFIX "Trace"
#define LV2_LOG__Warning LV2_LOG_PREFIX "Warning"
#define LV2_LOG__log     LV2_LOG_PREFIX "log"

#include <stdarg.h>

#include "urid.h"

#ifdef __cplusplus
extern "C" {
#endif

#ifdef __GNUC__
/** Allow type checking of printf-like functions. */
#    define LV2_LOG_FUNC(fmt, arg1) __attribute__((format(printf, fmt, arg1)))
#else
#    define LV2_LOG_FUNC(fmt, arg1)
#endif

/**
   Opaque data to host data for LV2_Log_Log.
*/
typedef void* LV2_Log_Handle;

/**
   Log feature (LV2_LOG__log)
*/
typedef struct _LV2_Log {
	/**
	   Opaque pointer to host data.

	   This MUST be passed to methods in this struct whenever they are called.
	   Otherwise, it must not be interpreted in any way.
	*/
	LV2_Log_Handle handle;

	/**
	   Log a message, passing format parameters directly.

	   The API of this function matches that of the standard C printf function,
	   except for the addition of the first two parameters.  This function may
	   be called from any non-realtime context, or from any context if `type`
	   is @ref LV2_LOG__Trace.
	*/
	LV2_LOG_FUNC(3, 4)
	int (*printf)(LV2_Log_Handle handle,
	              LV2_URID       type,
	              const char*    fmt, ...);

	/**
	   Log a message, passing format parameters in a va_list.

	   The API of this function matches that of the standard C vprintf
	   function, except for the addition of the first two parameters.  This
	   function may be called from any non-realtime context, or from any
	   context if `type` is @ref LV2_LOG__Trace.
	*/
	LV2_LOG_FUNC(3, 0)
	int (*vprintf)(LV2_Log_Handle handle,
	               LV2_URID       type,
	               const char*    fmt,
	               va_list        ap);
} LV2_Log_Log;

#ifdef __cplusplus
}  /* extern "C" */
#endif

#endif  /* LV2_LOG_H */

/**
   @}
*/