transmission/libtransmission/error.h

175 lines
5.5 KiB
C

/*
* This file Copyright (C) 2013-2014 Mnemosyne LLC
*
* It may be used under the GNU GPL versions 2 or 3
* or any future license endorsed by Mnemosyne LLC.
*
* $Id$
*/
#ifndef TR_ERROR_H
#define TR_ERROR_H
#include <stdarg.h>
#ifdef __cplusplus
extern "C" {
#endif
#ifndef TR_GNUC_PRINTF
#ifdef __GNUC__
#define TR_GNUC_PRINTF(fmt, args) __attribute__ ((format (printf, fmt, args)))
#else
#define TR_GNUC_PRINTF(fmt, args)
#endif
#endif
/**
* @addtogroup error Error reporting
* @{
*/
/** @brief Structure holding error information. */
typedef struct tr_error
{
/** @brief Error code, platform-specific */
int code;
/** @brief Error message */
char * message;
}
tr_error;
/**
* @brief Create new error object using `printf`-style formatting.
*
* @param[in] code Error code (platform-specific).
* @param[in] message_format Error message format string.
* @param[in] ... Format arguments.
*
* @return Newly allocated error object on success, `NULL` otherwise.
*/
tr_error * tr_error_new (int code,
const char * message_format,
...) TR_GNUC_PRINTF (2, 3);
/**
* @brief Create new error object using literal error message.
*
* @param[in] code Error code (platform-specific).
* @param[in] message Error message.
*
* @return Newly allocated error object on success, `NULL` otherwise.
*/
tr_error * tr_error_new_literal (int code,
const char * message);
/**
* @brief Create new error object using `vprintf`-style formatting.
*
* @param[in] code Error code (platform-specific).
* @param[in] message_format Error message format string.
* @param[in] args Format arguments.
*
* @return Newly allocated error object on success, `NULL` otherwise.
*/
tr_error * tr_error_new_valist (int code,
const char * message_format,
va_list args);
/**
* @brief Free memory used by error object.
*
* @param[in] error Error object to be freed.
*/
void tr_error_free (tr_error * error);
/**
* @brief Create and set new error object using `printf`-style formatting.
*
* If passed pointer to error object is `NULL`, do nothing.
*
* @param[in,out] error Pointer to error object to be set.
* @param[in] code Error code (platform-specific).
* @param[in] message_format Error message format string.
* @param[in] ... Format arguments.
*/
void tr_error_set (tr_error ** error,
int code,
const char * message_format,
...) TR_GNUC_PRINTF (3, 4);
/**
* @brief Create and set new error object using literal error message.
*
* If passed pointer to error object is `NULL`, do nothing.
*
* @param[in,out] error Pointer to error object to be set.
* @param[in] code Error code (platform-specific).
* @param[in] message Error message.
*/
void tr_error_set_literal (tr_error ** error,
int code,
const char * message);
/**
* @brief Propagate existing error object upwards.
*
* If passed pointer to new error object is not `NULL`, copy old error object to
* new error object and free old error object. Otherwise, just free old error
* object.
*
* @param[in,out] new_error Pointer to error object to be set.
* @param[in,out] old_error Error object to be propagated. Cleared on return.
*/
void tr_error_propagate (tr_error ** new_error,
tr_error ** old_error);
/**
* @brief Clear error object.
*
* Free error object being pointed and set pointer to `NULL`. If passed pointer
* is `NULL`, do nothing.
*
* @param[in,out] error Pointer to error object to be cleared.
*/
void tr_error_clear (tr_error ** error);
/**
* @brief Prefix message of exising error object.
*
* If passed pointer to error object is not `NULL`, prefix its message with
* `printf`-style formatted text. Otherwise, do nothing.
*
* @param[in,out] error Pointer to error object to be set.
* @param[in] prefix_format Prefix format string.
* @param[in] ... Format arguments.
*/
void tr_error_prefix (tr_error ** error,
const char * prefix_format,
...) TR_GNUC_PRINTF (2, 3);
/**
* @brief Prefix message and propagate existing error object upwards.
*
* If passed pointer to new error object is not `NULL`, copy old error object to
* new error object, prefix its message with `printf`-style formatted text, and
* free old error object. Otherwise, just free old error object.
*
* @param[in,out] new_error Pointer to error object to be set.
* @param[in,out] old_error Error object to be propagated. Cleared on return.
* @param[in] prefix_format Prefix format string.
* @param[in] ... Format arguments.
*/
void tr_error_propagate_prefixed (tr_error ** new_error,
tr_error ** old_error,
const char * prefix_format,
...) TR_GNUC_PRINTF (3, 4);
/** @} */
#ifdef __cplusplus
}
#endif
#endif