/usr/include/cpl_error.h is in libcpl-dev 7.1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* This file is part of the ESO Common Pipeline Library
* Copyright (C) 2001-2017 European Southern Observatory
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef CPL_ERROR_H
#define CPL_ERROR_H
#include <stdlib.h>
#include <cpl_macros.h>
#include <cpl_func.h>
#include <cxutils.h>
CPL_BEGIN_DECLS
/*
*
* This module provides functions to maintain the @em cpl_error status.
*/
/*-----------------------------------------------------------------------------
Defines
-----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------*/
/**
@ingroup cpl_error
@brief The maximum length of a CPL error message
@see cpl_error_get_message()
*/
/*----------------------------------------------------------------------------*/
#ifndef CPL_ERROR_MAX_MESSAGE_LENGTH
#define CPL_ERROR_MAX_MESSAGE_LENGTH 256
#endif
/*----------------------------------------------------------------------------*/
/**
@ingroup cpl_error
@hideinitializer
@brief Flag to indicate support for variadic macros
@see cpl_error_set_message()
@note Unless already defined, tries to detect whether variadic macros are
supported, typically at compile-time of a CPL-based application.
This check, which is hardly robust, should support
- disabling of variadic macros when compiling with @em gcc @em -ansi
- enabling them when compiling with a C99 compliant compiler, such as
@em gcc @em -std=c99
*/
/*----------------------------------------------------------------------------*/
#ifndef CPL_HAVE_VA_ARGS
# if !defined __STDC_VERSION__ && defined __STRICT_ANSI__
/* (llvm-)gcc -ansi and (llvm-)gcc -std=c89 do not define __STDC_VERSION__
but they do define __STRICT_ANSI__ */
# define CPL_HAVE_VA_ARGS 0
# else
/* (llvm-)gcc with other language standards (incl. gnu89 (equivalent to
no language specification), iso9899:199409, c99) reaches this point */
/* Sunstudio 12.1 c99 reaches this point since it defines __STDC_VERSION__
to 199901L as expected (it also defines __STRICT_ANSI__) */
# define CPL_HAVE_VA_ARGS 1
# endif
#endif
/*----------------------------------------------------------------------------*/
/**
* @ingroup cpl_error
@hideinitializer
@brief Generic error handling macro
@param CONDITION The condition to check
@param CODE The CPL error code to set if @em CONDTION is non-zero
@param ACTION A statement that is executed iff the @em CONDITION
evaluates to non-zero.
@param ... A printf-style message for cpl_error_set_message().
@see cpl_error_set_message()
@note This macro should not be used directly. It is defined only to support
user-defined error handling macros. If CODE equals CPL_ERROR_NONE, a CPL
error with code CPL_ERROR_UNSPECIFIED is created. The message may be a
printf-like format string supplied with arguments unless variadic macros
are not supported in which case only a (non-format) string is accepted.
The provided @em CODE, @em ACTION and @em __VA_ARGS__ are evaluated/executed
only if the @em CONDITION evaluates to false (zero). The @em ACTION @em break
is unsupported (it currently causes the execution to continue after @em
cpl_error_ensure()). Some of the below examples
use a @em goto statement to jump to a single cleanup label, assumed to
be located immediately before the function's unified cleanup-code and return
point. This error-handling scheme is reminiscent of using exceptions in
languages that support exceptions (C++, Java, ...). The use of @em goto and
a single clean-up label per function "if the error-handling code is non-
trivial, and if errors can occur in several places" is sanctioned by
Kernigan & Richie: "The C Programming Language".
For any other purpose @em goto should be avoided.
Useful definitions might include
@code
#define assure(BOOL, CODE) \
cpl_error_ensure(BOOL, CODE, goto cleanup, " ")
#define check(CMD) \
cpl_error_ensure((CMD, cpl_error_get_code() == CPL_ERROR_NONE), \
cpl_error_get_code(), goto cleanup, " ")
#define assert(BOOL) \
cpl_error_ensure(BOOL, CPL_ERROR_UNSPECIFIED, goto cleanup, \
"Internal error, please report to " PACKAGE_BUGREPORT)
@endcode
or (same as above, but including printf-style error messages)
@code
#define assure(BOOL, CODE, ...) \
cpl_error_ensure(BOOL, CODE, goto cleanup, __VA_ARGS__)
#define check(CMD, ...) \
cpl_error_ensure((CMD, cpl_error_get_code() == CPL_ERROR_NONE), \
cpl_error_get_code(), goto cleanup, __VA_ARGS__)
#define assert(BOOL, ...) \
cpl_error_ensure(BOOL, CPL_ERROR_UNSPECIFIED, goto cleanup, \
"Internal error, please report to " PACKAGE_BUGREPORT \
" " __VA_ARGS__)
/ * Assumes that PACKAGE_BUGREPORT
contains no formatting special characters * /
@endcode
or
@code
#define skip_if(BOOL) \
cpl_error_ensure(BOOL, cpl_error_get_code() != CPL_ERROR_NONE ? \
cpl_error_get_code() : CPL_ERROR_UNSPECIFIED, \
goto cleanup, " ")
@endcode
The check macros in the examples above can be used to check a command
which sets the cpl_error_code in case of failure (or, by use of a comma
expression, a longer sequence of such commands):
@code
check(
(x = cpl_table_get_int(table, "x", 0, NULL),
y = cpl_table_get_int(table, "y", 0, NULL),
z = cpl_table_get_int(table, "z", 0, NULL)),
"Error reading wavelength catalogue");
@endcode
*/
/*----------------------------------------------------------------------------*/
#if defined CPL_HAVE_VA_ARGS && CPL_HAVE_VA_ARGS == 1 || defined DOXYGEN_SKIP
#define cpl_error_ensure(CONDITION, CODE, ACTION, ...) \
do if (CPL_UNLIKELY(!(CONDITION))) { \
/* Evaluate exactly once using a name-space protected variable name */ \
const cpl_error_code cpl_ensure_error = (CODE); \
(void)cpl_error_set_message_macro(cpl_func, cpl_ensure_error \
? cpl_ensure_error : \
CPL_ERROR_UNSPECIFIED, \
__FILE__, __LINE__, __VA_ARGS__); \
ACTION; \
} while (0)
#else
#define cpl_error_ensure(CONDITION, CODE, ACTION, MSG) \
do if (CPL_UNLIKELY(!(CONDITION))) { \
/* Evaluate exactly once using a name-space protected variable name */ \
const cpl_error_code cpl_ensure_error = (CODE); \
(void)cpl_error_set_message_one_macro(cpl_func, cpl_ensure_error \
? cpl_ensure_error : \
CPL_ERROR_UNSPECIFIED, \
__FILE__, __LINE__, MSG); \
ACTION; \
} while (0)
#endif
/*----------------------------------------------------------------------------*/
/**
@ingroup cpl_error
@hideinitializer
@brief Set an error code and return iff a boolean expression is false
@param BOOL The boolean to evaluate
@param ERRCODE The error code to set
@param RETURN The value to return
@note This macro will cause a return from its calling function.
If ERRCODE equals CPL_ERROR_NONE, the error-code is set
to CPL_ERROR_UNSPECIFIED.
The boolean is always evaluated (unlike assert()).
This macro may not be used in inline'd functions.
@see cpl_error_set()
*/
/*----------------------------------------------------------------------------*/
#define cpl_ensure(BOOL, ERRCODE, RETURN) \
cpl_error_ensure(BOOL, ERRCODE, return(RETURN), " ")
/*----------------------------------------------------------------------------*/
/**
@ingroup cpl_error
@hideinitializer
@brief Set an error code and return it iff a boolean expression is false
@param BOOL The boolean to evaluate
@param ERRCODE The error code to set and return
@see cpl_ensure()
*/
/*----------------------------------------------------------------------------*/
#define cpl_ensure_code(BOOL, ERRCODE) \
cpl_error_ensure(BOOL, ERRCODE, return(cpl_error_get_code()), " ")
/**
* @ingroup cpl_error
* @hideinitializer
* @brief
* Set CPL error code, function name, source file and line number where
* an error occurred.
*
* @param function Character string with function name, cpl_func
* @param code Error code
*
* @return The specified error code.
* @note If code is CPL_ERROR_NONE, nothing is done (and code is returned),
* if code is CPL_ERROR_HISTORY_LOST (but avoid that) then
* CPL_ERROR_UNSPECIFIED is set and returned.
*
* @hideinitializer
*/
#define cpl_error_set(function, code) \
cpl_error_set_message_macro(function, code, __FILE__, __LINE__, " ")
/**
* @ingroup cpl_error
* @hideinitializer
* @brief Propagate a CPL-error to the current location.
*
* @param function Character string with function name, cpl_func
*
* @return The preexisting CPL error code (possibly CPL_ERROR_NONE).
* @see cpl_error_set()
* @note If no error exists, nothing is done and CPL_ERROR_NONE is returned
*
* If a CPL error already exists, this function creates a new CPL error
* with the preexisting CPL error code and the current location.
*
* In a function of type cpl_error_code an error can be propagated with:
* @code
*
* return cpl_error_set_where(cpl_func);
*
* @endcode
*
* @hideinitializer
*/
#define cpl_error_set_where(function) \
cpl_error_set_message_macro(function, cpl_error_get_code(), \
__FILE__, __LINE__, " ")
/**
* @ingroup cpl_error
* @hideinitializer
* @brief
* Set CPL error code, function name, source file and line number where
* an error occurred along with a text message
*
* @param function Character string with function name, cpl_func
* @param code Error code
* @param ... Variable argument list with message
* @return The CPL error code
* @see cpl_error_set()
* @note The message is ignored if it is NULL, empty, or consists of a single
* ' ' (space). Otherwise, the user supplied message is appended to
* the default message using ': ' (colon+space) as delimiter.
* If the CPL-based application may use variadic macros, the message
* may be a printf-style format string supplied with matching arguments.
* If variadic macros are not allowed (e.g. when compiling with gcc -ansi)
* only a non-format string is accepted. Please be aware that the format
* string should always be a string literal, otherwise the code may be
* vulnerable to the socalled 'format string exploit'. Sufficiently recent
* versions of gcc supports the option -Wformat-security, which tries to
* warn of this issue. If variadic macros are not supported, a
* printf-style message can be created prior to the call to
* cpl_error_set_message(), as in the below example.
*
* Examples of usage:
* @code
*
* if (image == NULL) {
* return cpl_error_set_message(cpl_func, CPL_ERROR_NULL_INPUT,
* "Image number %d is NULL", number);
* }
*
* @endcode
*
* @code
*
* if (error_string != NULL) {
* return cpl_error_set_message(cpl_func, CPL_ERROR_ILLEGAL_INPUT,
* "%s", error_string);
* }
*
* @endcode
*
* Example of usage if and only if variadic macros are unavaiable (e.g. when
* compiling with gcc -ansi):
* @code
*
* if (image == NULL) {
* char * my_txt = cpl_sprintf("Image number %d is NULL", number);
* const cpl_error_code my_code =
* cpl_error_set_message(cpl_func, CPL_ERROR_NULL_INPUT, my_txt);
* cpl_free(my_txt);
* return my_code;
* }
*
* @endcode
*
* @hideinitializer
*/
#if defined CPL_HAVE_VA_ARGS && CPL_HAVE_VA_ARGS == 1 || defined DOXYGEN_SKIP
#define cpl_error_set_message(function, code, ...) \
cpl_error_set_message_macro(function, code, __FILE__, __LINE__, __VA_ARGS__)
#else
#define cpl_error_set_message(function, code, text) \
cpl_error_set_message_one_macro(function, code, __FILE__, __LINE__, text)
#endif
/*-----------------------------------------------------------------------------
New types
-----------------------------------------------------------------------------*/
/**
* @ingroup cpl_error
* @brief
* Available error codes.
@c CPL_ERROR_NONE is equal to zero and compares to less than all other
error codes.
All error codes are guaranteed to be less than @c CPL_ERROR_EOL
(End Of List). @c CPL_ERROR_EOL allows user defined error
codes to be added in this fashion:
@code
const int my_first_error_code = 0 + CPL_ERROR_EOL;
const int my_second_error_code = 1 + CPL_ERROR_EOL;
const int my_third_error_code = 2 + CPL_ERROR_EOL;
if (is_connected() == CPL_FALSE) {
return cpl_error_set_message(cpl_func, my_first_error_code, "No "
"connection to host %s (after %u tries)",
hostname, max_attempts);
}
@endcode
Extensive use of user defined error codes should be avoided. Instead a
request of new CPL error codes should be emailed to cpl-help@eso.org.
*/
enum _cpl_error_code_ {
CPL_ERROR_NONE = 0,
/**< No error condition */
CPL_ERROR_UNSPECIFIED = 1,
/**< An unspecified error. FIXME: Do not set to 1 and verify correctness */
CPL_ERROR_HISTORY_LOST,
/**< The actual CPL error has been lost. Do not use to create a CPL error */
CPL_ERROR_DUPLICATING_STREAM,
/**< Could not duplicate output stream */
CPL_ERROR_ASSIGNING_STREAM,
/**< Could not associate a stream with a file descriptor */
CPL_ERROR_FILE_IO,
/**< Permission denied */
CPL_ERROR_BAD_FILE_FORMAT,
/**< Input file had not the expected format */
CPL_ERROR_FILE_ALREADY_OPEN,
/**< Attempted to open a file twice */
CPL_ERROR_FILE_NOT_CREATED,
/**< Could not create a file */
CPL_ERROR_FILE_NOT_FOUND,
/**< A specified file or directory was not found */
CPL_ERROR_DATA_NOT_FOUND,
/**< Data searched within a valid object were not found */
CPL_ERROR_ACCESS_OUT_OF_RANGE,
/**< Data were accessed beyond boundaries */
CPL_ERROR_NULL_INPUT,
/**< A @c NULL pointer was found where a valid pointer was expected */
CPL_ERROR_INCOMPATIBLE_INPUT,
/**< Data that had to be processed together did not match */
CPL_ERROR_ILLEGAL_INPUT,
/**< Illegal values were detected */
CPL_ERROR_ILLEGAL_OUTPUT,
/**< A given operation would have generated an illegal object */
CPL_ERROR_UNSUPPORTED_MODE,
/**< The requested functionality is not supported */
CPL_ERROR_SINGULAR_MATRIX,
/**< Could not invert a matrix */
CPL_ERROR_DIVISION_BY_ZERO,
/**< Attempted to divide a number by zero */
CPL_ERROR_TYPE_MISMATCH,
/**< Data were not of the expected type */
CPL_ERROR_INVALID_TYPE,
/**< Data type was unsupported or invalid */
CPL_ERROR_CONTINUE,
/**< An iterative process did not converge */
CPL_ERROR_NO_WCS,
/**< The WCS functionalities are missing */
CPL_ERROR_EOL
/**< To permit extensibility of error handling.
It is a coding error to use this within CPL itself! */
};
/**
* @ingroup cpl_error
* @brief
* The cpl_error_code type definition
*/
typedef enum _cpl_error_code_ cpl_error_code;
typedef struct _cpl_error_ cpl_error;
/*-----------------------------------------------------------------------------
Function prototypes
-----------------------------------------------------------------------------*/
void cpl_error_reset(void);
cpl_error_code
cpl_error_set_message_macro(const char *, cpl_error_code,
const char *, unsigned,
const char *, ...) CPL_ATTR_PRINTF(5,6)
#ifdef CPL_HAVE_ATTR_NONNULL
__attribute__((nonnull(3)))
#endif
;
cpl_error_code
cpl_error_set_message_one_macro(const char *, cpl_error_code,
const char *, unsigned,
const char *)
#ifdef CPL_HAVE_ATTR_NONNULL
__attribute__((nonnull(3)))
#endif
;
cpl_error_code cpl_error_get_code(void) CPL_ATTR_PURE;
const char *cpl_error_get_message(void) CPL_ATTR_PURE;
const char *cpl_error_get_message_default(cpl_error_code) CPL_ATTR_CONST;
const char *cpl_error_get_function(void) CPL_ATTR_PURE;
const char *cpl_error_get_file(void) CPL_ATTR_PURE;
unsigned cpl_error_get_line(void) CPL_ATTR_PURE;
const char *cpl_error_get_where(void) CPL_ATTR_PURE;
CPL_END_DECLS
#endif
/* end of cpl_error.h */
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