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/*************************************************************************
* Copyright (C) 2009-2010 Tavian Barnes <tavianator@gmail.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library 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 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Library 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 this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
/**
* @file
* Error reporting interface. Errors are reported at a given severity by the
* dmnsn_error() macro at a given severity, which prints a warning if it is
* below the set resilience, or prints an error and exits if it's at or above
* the set resilience.
*/
#ifndef DIMENSION_ERROR_H
#define DIMENSION_ERROR_H
/** Error severity codes. */
typedef enum dmnsn_severity {
DMNSN_SEVERITY_LOW, /**< Only die on low resilience. */
DMNSN_SEVERITY_MEDIUM, /**< Die on low or medium resilience. */
DMNSN_SEVERITY_HIGH /**< Always die. */
} dmnsn_severity;
/**
* @internal
* @def DMNSN_FUNC
* @brief Expands to the name of the current function
*/
#ifdef __GNUC__
#define DMNSN_FUNC __PRETTY_FUNCTION__
#elif __STDC_VERSION__ >= 199901L
#define DMNSN_FUNC __func__
#else
#define DMNSN_FUNC "<unknown function>"
#endif
/**
* Report an error.
* @param[in] severity A @ref dmnsn_severity representing the severity of the
* error. DMNSN_SEVERITY_HIGH will always terminate the
* running thread.
* @param[in] str A string to print explaining the error.
*/
#define dmnsn_error(severity, str) \
dmnsn_report_error((dmnsn_severity)(severity), \
DMNSN_FUNC, __FILE__, __LINE__, \
str)
/**
* @def dmnsn_assert
* Make an assertion.
* @param[in] expr The expression to assert.
* @param[in] str A string to print if the assertion fails.
*/
#ifdef NDEBUG
#define dmnsn_assert(expr, str) ((void)0)
#else
#define dmnsn_assert(expr, str) \
do { \
if (!(expr)) { \
dmnsn_error(DMNSN_SEVERITY_HIGH, (str)); \
} \
} while (0)
#endif
/**
* @internal
* Called by dmnsn_error(); don't call directly.
* @param[in] severity The severity of the error.
* @param[in] func The name of the function where the error originated.
* @param[in] file The file where the error originated.
* @param[in] line The line number where the error originated.
* @param[in] str A string describing the error.
*/
void dmnsn_report_error(dmnsn_severity severity,
const char *func, const char *file, unsigned int line,
const char *str);
/**
* Get the library resilience, thread-safely.
* @return The error severity considered fatal.
*/
dmnsn_severity dmnsn_get_resilience(void);
/**
* Set the library resilience, thread-safely.
* @param[in] resilience The new minimum severity that will cause a fatal
* error.
*/
void dmnsn_set_resilience(dmnsn_severity resilience);
/**
* Fatal error callback type. This function should never return.
*/
typedef void dmnsn_fatal_error_fn(void);
/**
* Get the libdimension fatal error handler, thread-safely. The default fatal
* error handler terminates the current thread, or the entire program if the
* current thread is the main thread.
* @return The current fatal error handler.
*/
dmnsn_fatal_error_fn *dmnsn_get_fatal_error_fn(void);
/**
* Set the libdimension fatal error handler, thread-safely.
* @param[in] fatal The new fatal error handler. This function must never
* return.
*/
void dmnsn_set_fatal_error_fn(dmnsn_fatal_error_fn *fatal);
#endif /* DIMENSION_ERROR_H */
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