transmission/libtransmission/error.h

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// This file Copyright © 2013-2023 Mnemosyne LLC.
2022-08-08 18:05:39 +00:00
// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#pragma once
#include <string_view>
/**
* @addtogroup error Error reporting
* @{
*/
/** @brief Structure holding error information. */
struct tr_error
{
/** @brief Error code, platform-specific */
int code;
/** @brief Error message */
char* message;
};
/**
* @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 literal error message.
*
* If passed pointer to error object is `nullptr`, 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(tr_error** error, int code, std::string_view message);
/**
* @brief shorthand for `tr_error_set(error, errno, tr_strerror(errno))`
*/
void tr_error_set_from_errno(tr_error** error, int errnum);
/**
* @brief Propagate existing error object upwards.
*
* If passed pointer to new error object is not `nullptr`, 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 `nullptr`. If passed
* pointer is `nullptr`, do nothing.
*
* @param[in,out] error Pointer to error object to be cleared.
*/
void tr_error_clear(tr_error** error);
/**
* @brief Prefix message of existing error object.
*
* If passed pointer to error object is not `nullptr`, 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, char const* prefix);
/** @} */