224 lines
7.5 KiB
C
224 lines
7.5 KiB
C
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef __CLG_LOG_H__
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#define __CLG_LOG_H__
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/** \file
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* \ingroup clog
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*
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* C Logging Library (clog)
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* ========================
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*
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* Usage
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* -----
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*
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* - `CLG_LOGREF_DECLARE_GLOBAL` macro to declare #CLG_LogRef pointers.
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* - `CLOG_` prefixed macros for logging.
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*
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* Identifiers
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* -----------
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*
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* #CLG_LogRef holds an identifier which defines the category of the logger.
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*
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* You can define and use identifiers as needed, logging will lazily initialize them.
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*
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* By convention lower case dot separated identifiers are used, eg:
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* `module.sub_module`, this allows filtering by `module.*`,
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* see #CLG_type_filter_include, #CLG_type_filter_exclude
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*
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* There is currently no functionality to remove a category once it's created.
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*
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* Severity
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* --------
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*
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* - `INFO`: Simply log events, uses verbosity levels to control how much information to show.
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* - `WARN`: General warnings (which aren't necessary to show to users).
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* - `ERROR`: An error we can recover from, should not happen.
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* - `FATAL`: Similar to assert. This logs the message, then a stack trace and abort.
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* Verbosity Level
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* ---------------
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*
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* Usage:
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*
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* - 0: Always show (used for warnings, errors).
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* Should never get in the way or become annoying.
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*
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* - 1: Top level module actions (eg: load a file, create a new window .. etc).
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*
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* - 2: Actions within a module (steps which compose an action, but don't flood output).
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* Running a tool, full data recalculation.
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*
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* - 3: Detailed actions which may be of interest when debugging internal logic of a module
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* These *may* flood the log with details.
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*
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* - 4+: May be used for more details than 3, should be avoided but not prevented.
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#ifdef __GNUC__
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# define _CLOG_ATTR_NONNULL(args...) __attribute__((nonnull(args)))
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#else
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# define _CLOG_ATTR_NONNULL(...)
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#endif
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#ifdef __GNUC__
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# define _CLOG_ATTR_PRINTF_FORMAT(format_param, dots_param) \
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__attribute__((format(printf, format_param, dots_param)))
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#else
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# define _CLOG_ATTR_PRINTF_FORMAT(format_param, dots_param)
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#endif
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#define STRINGIFY_ARG(x) "" #x
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#define STRINGIFY_APPEND(a, b) "" a #b
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#define STRINGIFY(x) STRINGIFY_APPEND("", x)
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struct CLogContext;
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/* Don't typedef enums. */
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enum CLG_LogFlag {
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CLG_FLAG_USE = (1 << 0),
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};
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enum CLG_Severity {
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CLG_SEVERITY_INFO = 0,
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CLG_SEVERITY_WARN,
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CLG_SEVERITY_ERROR,
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CLG_SEVERITY_FATAL,
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};
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#define CLG_SEVERITY_LEN (CLG_SEVERITY_FATAL + 1)
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/* Each logger ID has one of these. */
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typedef struct CLG_LogType {
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struct CLG_LogType *next;
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char identifier[64];
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/** FILE output. */
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struct CLogContext *ctx;
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/** Control behavior. */
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int level;
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enum CLG_LogFlag flag;
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} CLG_LogType;
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typedef struct CLG_LogRef {
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const char *identifier;
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CLG_LogType *type;
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} CLG_LogRef;
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void CLG_log_str(CLG_LogType *lg,
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enum CLG_Severity severity,
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const char *file_line,
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const char *fn,
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const char *message) _CLOG_ATTR_NONNULL(1, 3, 4, 5);
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void CLG_logf(CLG_LogType *lg,
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enum CLG_Severity severity,
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const char *file_line,
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const char *fn,
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const char *format,
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...) _CLOG_ATTR_NONNULL(1, 3, 4, 5) _CLOG_ATTR_PRINTF_FORMAT(5, 6);
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/* Main initializer and destructor (per session, not logger). */
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void CLG_init(void);
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void CLG_exit(void);
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void CLG_output_set(void *file_handle);
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void CLG_output_use_basename_set(int value);
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void CLG_output_use_timestamp_set(int value);
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void CLG_error_fn_set(void (*error_fn)(void *file_handle));
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void CLG_fatal_fn_set(void (*fatal_fn)(void *file_handle));
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void CLG_backtrace_fn_set(void (*fatal_fn)(void *file_handle));
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void CLG_type_filter_include(const char *type_filter, int type_filter_len);
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void CLG_type_filter_exclude(const char *type_filter, int type_filter_len);
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void CLG_level_set(int level);
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void CLG_logref_init(CLG_LogRef *clg_ref);
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int CLG_color_support_get(CLG_LogRef *clg_ref);
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/** Declare outside function, declare as extern in header. */
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#define CLG_LOGREF_DECLARE_GLOBAL(var, id) \
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static CLG_LogRef _static_##var = {id}; \
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CLG_LogRef *var = &_static_##var
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/** Initialize struct once. */
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#define CLOG_ENSURE(clg_ref) \
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((clg_ref)->type ? (clg_ref)->type : (CLG_logref_init(clg_ref), (clg_ref)->type))
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#define CLOG_CHECK(clg_ref, verbose_level, ...) \
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((void)CLOG_ENSURE(clg_ref), \
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((clg_ref)->type->flag & CLG_FLAG_USE) && ((clg_ref)->type->level >= verbose_level))
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#define CLOG_AT_SEVERITY(clg_ref, severity, verbose_level, ...) \
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{ \
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CLG_LogType *_lg_ty = CLOG_ENSURE(clg_ref); \
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if (((_lg_ty->flag & CLG_FLAG_USE) && (_lg_ty->level >= verbose_level)) || \
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(severity >= CLG_SEVERITY_WARN)) { \
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CLG_logf(_lg_ty, severity, __FILE__ ":" STRINGIFY(__LINE__), __func__, __VA_ARGS__); \
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} \
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} \
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((void)0)
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#define CLOG_STR_AT_SEVERITY(clg_ref, severity, verbose_level, str) \
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{ \
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CLG_LogType *_lg_ty = CLOG_ENSURE(clg_ref); \
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if (((_lg_ty->flag & CLG_FLAG_USE) && (_lg_ty->level >= verbose_level)) || \
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(severity >= CLG_SEVERITY_WARN)) { \
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CLG_log_str(_lg_ty, severity, __FILE__ ":" STRINGIFY(__LINE__), __func__, str); \
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} \
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} \
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((void)0)
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#define CLOG_STR_AT_SEVERITY_N(clg_ref, severity, verbose_level, str) \
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{ \
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CLG_LogType *_lg_ty = CLOG_ENSURE(clg_ref); \
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if (((_lg_ty->flag & CLG_FLAG_USE) && (_lg_ty->level >= verbose_level)) || \
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(severity >= CLG_SEVERITY_WARN)) { \
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const char *_str = str; \
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CLG_log_str(_lg_ty, severity, __FILE__ ":" STRINGIFY(__LINE__), __func__, _str); \
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MEM_freeN((void *)_str); \
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} \
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} \
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((void)0)
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#define CLOG_INFO(clg_ref, level, ...) \
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CLOG_AT_SEVERITY(clg_ref, CLG_SEVERITY_INFO, level, __VA_ARGS__)
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#define CLOG_WARN(clg_ref, ...) CLOG_AT_SEVERITY(clg_ref, CLG_SEVERITY_WARN, 0, __VA_ARGS__)
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#define CLOG_ERROR(clg_ref, ...) CLOG_AT_SEVERITY(clg_ref, CLG_SEVERITY_ERROR, 0, __VA_ARGS__)
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#define CLOG_FATAL(clg_ref, ...) CLOG_AT_SEVERITY(clg_ref, CLG_SEVERITY_FATAL, 0, __VA_ARGS__)
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#define CLOG_STR_INFO(clg_ref, level, str) \
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CLOG_STR_AT_SEVERITY(clg_ref, CLG_SEVERITY_INFO, level, str)
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#define CLOG_STR_WARN(clg_ref, str) CLOG_STR_AT_SEVERITY(clg_ref, CLG_SEVERITY_WARN, 0, str)
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#define CLOG_STR_ERROR(clg_ref, str) CLOG_STR_AT_SEVERITY(clg_ref, CLG_SEVERITY_ERROR, 0, str)
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#define CLOG_STR_FATAL(clg_ref, str) CLOG_STR_AT_SEVERITY(clg_ref, CLG_SEVERITY_FATAL, 0, str)
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/* Allocated string which is immediately freed. */
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#define CLOG_STR_INFO_N(clg_ref, level, str) \
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CLOG_STR_AT_SEVERITY_N(clg_ref, CLG_SEVERITY_INFO, level, str)
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#define CLOG_STR_WARN_N(clg_ref, str) CLOG_STR_AT_SEVERITY_N(clg_ref, CLG_SEVERITY_WARN, 0, str)
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#define CLOG_STR_ERROR_N(clg_ref, str) CLOG_STR_AT_SEVERITY_N(clg_ref, CLG_SEVERITY_ERROR, 0, str)
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#define CLOG_STR_FATAL_N(clg_ref, str) CLOG_STR_AT_SEVERITY_N(clg_ref, CLG_SEVERITY_FATAL, 0, str)
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#ifdef __cplusplus
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}
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#endif
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#endif /* __CLG_LOG_H__ */
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