357 lines
13 KiB
C
357 lines
13 KiB
C
/*
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*******************************************************************************
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*
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* Copyright (C) 2003-2005, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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*******************************************************************************
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* file name: utrace.h
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* encoding: US-ASCII
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2003aug06
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* created by: Markus W. Scherer
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*
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* Definitions for ICU tracing/logging.
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*
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*/
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#ifndef __UTRACE_H__
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#define __UTRACE_H__
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#include <stdarg.h>
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#include "unicode/utypes.h"
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/**
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* \file
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* \brief C API: Definitions for ICU tracing/logging.
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*/
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U_CDECL_BEGIN
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#ifndef U_HIDE_DRAFT_API
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/**
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* Trace severity levels. Higher levels increase the verbosity of the trace output.
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* @see utrace_setLevel
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* @stable ICU 2.8
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*/
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typedef enum UTraceLevel {
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/** Disable all tracing @stable ICU 2.8*/
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UTRACE_OFF=-1,
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/** Trace error conditions only @stable ICU 2.8*/
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UTRACE_ERROR=0,
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/** Trace errors and warnings @stable ICU 2.8*/
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UTRACE_WARNING=3,
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/** Trace opens and closes of ICU services @stable ICU 2.8*/
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UTRACE_OPEN_CLOSE=5,
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/** Trace an intermediate number of ICU operations @stable ICU 2.8*/
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UTRACE_INFO=7,
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/** Trace the maximum number of ICU operations @stable ICU 2.8*/
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UTRACE_VERBOSE=9
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} UTraceLevel;
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/**
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* These are the ICU functions that will be traced when tracing is enabled.
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* @stable ICU 2.8
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*/
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typedef enum UTraceFunctionNumber {
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UTRACE_FUNCTION_START=0,
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UTRACE_U_INIT=UTRACE_FUNCTION_START,
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UTRACE_U_CLEANUP,
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UTRACE_FUNCTION_LIMIT,
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UTRACE_CONVERSION_START=0x1000,
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UTRACE_UCNV_OPEN=UTRACE_CONVERSION_START,
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UTRACE_UCNV_OPEN_PACKAGE,
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UTRACE_UCNV_OPEN_ALGORITHMIC,
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UTRACE_UCNV_CLONE,
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UTRACE_UCNV_CLOSE,
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UTRACE_UCNV_FLUSH_CACHE,
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UTRACE_UCNV_LOAD,
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UTRACE_UCNV_UNLOAD,
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UTRACE_CONVERSION_LIMIT,
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UTRACE_COLLATION_START=0x2000,
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UTRACE_UCOL_OPEN=UTRACE_COLLATION_START,
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UTRACE_UCOL_CLOSE,
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UTRACE_UCOL_STRCOLL,
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UTRACE_UCOL_GET_SORTKEY,
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UTRACE_UCOL_GETLOCALE,
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UTRACE_UCOL_NEXTSORTKEYPART,
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UTRACE_UCOL_STRCOLLITER,
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UTRACE_UCOL_OPEN_FROM_SHORT_STRING,
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UTRACE_COLLATION_LIMIT
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} UTraceFunctionNumber;
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#endif /*U_HIDE_DRAFT_API*/
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/**
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* Setter for the trace level.
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* @param traceLevel A UTraceLevel value.
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* @stable ICU 2.8
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*/
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U_STABLE void U_EXPORT2
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utrace_setLevel(int32_t traceLevel);
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/**
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* Getter for the trace level.
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* @return The UTraceLevel value being used by ICU.
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* @stable ICU 2.8
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*/
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U_STABLE int32_t U_EXPORT2
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utrace_getLevel(void);
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/* Trace function pointers types ----------------------------- */
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/**
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* Type signature for the trace function to be called when entering a function.
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* @param context value supplied at the time the trace functions are set.
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* @param fnNumber Enum value indicating the ICU function being entered.
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* @stable ICU 2.8
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*/
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typedef void U_CALLCONV
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UTraceEntry(const void *context, int32_t fnNumber);
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/**
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* Type signature for the trace function to be called when exiting from a function.
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* @param context value supplied at the time the trace functions are set.
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* @param fnNumber Enum value indicating the ICU function being exited.
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* @param fmt A formatting string that describes the number and types
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* of arguments included with the variable args. The fmt
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* string has the same form as the utrace_vformat format
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* string.
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* @param args A variable arguments list. Contents are described by
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* the fmt parameter.
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* @see utrace_vformat
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* @stable ICU 2.8
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*/
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typedef void U_CALLCONV
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UTraceExit(const void *context, int32_t fnNumber,
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const char *fmt, va_list args);
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/**
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* Type signature for the trace function to be called from within an ICU function
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* to display data or messages.
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* @param context value supplied at the time the trace functions are set.
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* @param fnNumber Enum value indicating the ICU function being exited.
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* @param level The current tracing level
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* @param fmt A format string describing the tracing data that is supplied
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* as variable args
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* @param args The data being traced, passed as variable args.
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* @stable ICU 2.8
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*/
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typedef void U_CALLCONV
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UTraceData(const void *context, int32_t fnNumber, int32_t level,
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const char *fmt, va_list args);
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/**
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* Set ICU Tracing functions. Installs application-provided tracing
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* functions into ICU. After doing this, subsequent ICU operations
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* will call back to the installed functions, providing a trace
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* of the use of ICU. Passing a NULL pointer for a tracing function
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* is allowed, and inhibits tracing action at points where that function
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* would be called.
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* <p>
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* Tracing and Threads: Tracing functions are global to a process, and
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* will be called in response to ICU operations performed by any
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* thread. If tracing of an individual thread is desired, the
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* tracing functions must themselves filter by checking that the
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* current thread is the desired thread.
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*
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* @param context an uninterpretted pointer. Whatever is passed in
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* here will in turn be passed to each of the tracing
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* functions UTraceEntry, UTraceExit and UTraceData.
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* ICU does not use or alter this pointer.
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* @param e Callback function to be called on entry to a
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* a traced ICU function.
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* @param x Callback function to be called on exit from a
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* traced ICU function.
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* @param d Callback function to be called from within a
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* traced ICU function, for the purpose of providing
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* data to the trace.
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*
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* @stable ICU 2.8
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*/
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U_STABLE void U_EXPORT2
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utrace_setFunctions(const void *context,
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UTraceEntry *e, UTraceExit *x, UTraceData *d);
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/**
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* Get the currently installed ICU tracing functions. Note that a null function
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* pointer will be returned if no trace function has been set.
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*
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* @param context The currently installed tracing context.
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* @param e The currently installed UTraceEntry function.
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* @param x The currently installed UTraceExit function.
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* @param d The currently installed UTraceData function.
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* @stable ICU 2.8
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*/
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U_STABLE void U_EXPORT2
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utrace_getFunctions(const void **context,
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UTraceEntry **e, UTraceExit **x, UTraceData **d);
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/*
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*
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* ICU trace format string syntax
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*
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* Format Strings are passed to UTraceData functions, and define the
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* number and types of the trace data being passed on each call.
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*
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* The UTraceData function, which is supplied by the application,
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* not by ICU, can either forward the trace data (passed via
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* varargs) and the format string back to ICU for formatting into
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* a displayable string, or it can interpret the format itself,
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* and do as it wishes with the trace data.
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*
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*
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* Goals for the format string
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* - basic data output
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* - easy to use for trace programmer
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* - sufficient provision for data types for trace output readability
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* - well-defined types and binary portable APIs
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*
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* Non-goals
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* - printf compatibility
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* - fancy formatting
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* - argument reordering and other internationalization features
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*
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* ICU trace format strings contain plain text with argument inserts,
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* much like standard printf format strings.
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* Each insert begins with a '%', then optionally contains a 'v',
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* then exactly one type character.
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* Two '%' in a row represent a '%' instead of an insert.
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* The trace format strings need not have \n at the end.
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*
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*
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* Types
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* -----
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*
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* Type characters:
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* - c A char character in the default codepage.
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* - s A NUL-terminated char * string in the default codepage.
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* - S A UChar * string. Requires two params, (ptr, length). Length=-1 for nul term.
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* - b A byte (8-bit integer).
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* - h A 16-bit integer. Also a 16 bit Unicode code unit.
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* - d A 32-bit integer. Also a 20 bit Unicode code point value.
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* - l A 64-bit integer.
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* - p A data pointer.
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*
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* Vectors
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* -------
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*
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* If the 'v' is not specified, then one item of the specified type
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* is passed in.
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* If the 'v' (for "vector") is specified, then a vector of items of the
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* specified type is passed in, via a pointer to the first item
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* and an int32_t value for the length of the vector.
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* Length==-1 means zero or NUL termination. Works for vectors of all types.
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*
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* Note: %vS is a vector of (UChar *) strings. The strings must
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* be nul terminated as there is no way to provide a
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* separate length parameter for each string. The length
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* parameter (required for all vectors) is the number of
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* strings, not the length of the strings.
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*
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* Examples
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* --------
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*
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* These examples show the parameters that will be passed to an application's
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* UTraceData() function for various formats.
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*
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* - the precise formatting is up to the application!
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* - the examples use type casts for arguments only to _show_ the types of
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* arguments without needing variable declarations in the examples;
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* the type casts will not be necessary in actual code
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*
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* UTraceDataFunc(context, fnNumber, level,
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* "There is a character %c in the string %s.", // Format String
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* (char)c, (const char *)s); // varargs parameters
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* -> There is a character 0x42 'B' in the string "Bravo".
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*
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* UTraceDataFunc(context, fnNumber, level,
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* "Vector of bytes %vb vector of chars %vc",
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* (const uint8_t *)bytes, (int32_t)bytesLength,
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* (const char *)chars, (int32_t)charsLength);
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* -> Vector of bytes
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* 42 63 64 3f [4]
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* vector of chars
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* "Bcd?"[4]
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*
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* UTraceDataFunc(context, fnNumber, level,
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* "An int32_t %d and a whole bunch of them %vd",
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* (int32_t)-5, (const int32_t *)ints, (int32_t)intsLength);
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* -> An int32_t 0xfffffffb and a whole bunch of them
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* fffffffb 00000005 0000010a [3]
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*
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*/
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/**
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* Trace output Formatter. An application's UTraceData tracing functions may call
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* back to this function to format the trace output in a
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* human readable form. Note that a UTraceData function may choose
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* to not format the data; it could, for example, save it in
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* in the raw form it was received (more compact), leaving
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* formatting for a later trace analyis tool.
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* @param outBuf pointer to a buffer to receive the formatted output. Output
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* will be nul terminated if there is space in the buffer -
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* if the length of the requested output < the output buffer size.
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* @param capacity Length of the output buffer.
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* @param indent Number of spaces to indent the output. Intended to allow
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* data displayed from nested functions to be indented for readability.
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* @param fmt Format specification for the data to output
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* @param args Data to be formatted.
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* @return Length of formatted output, including the terminating NUL.
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* If buffer capacity is insufficient, the required capacity is returned.
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* @stable ICU 2.8
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*/
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U_STABLE int32_t U_EXPORT2
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utrace_vformat(char *outBuf, int32_t capacity,
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int32_t indent, const char *fmt, va_list args);
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/**
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* Trace output Formatter. An application's UTraceData tracing functions may call
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* this function to format any additional trace data, beyond that
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* provided by default, in human readable form with the same
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* formatting conventions used by utrace_vformat().
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* @param outBuf pointer to a buffer to receive the formatted output. Output
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* will be nul terminated if there is space in the buffer -
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* if the length of the requested output < the output buffer size.
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* @param capacity Length of the output buffer.
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* @param indent Number of spaces to indent the output. Intended to allow
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* data displayed from nested functions to be indented for readability.
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* @param fmt Format specification for the data to output
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* @param ... Data to be formatted.
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* @return Length of formatted output, including the terminating NUL.
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* If buffer capacity is insufficient, the required capacity is returned.
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* @stable ICU 2.8
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*/
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U_STABLE int32_t U_EXPORT2
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utrace_format(char *outBuf, int32_t capacity,
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int32_t indent, const char *fmt, ...);
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/* Trace function numbers --------------------------------------------------- */
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/**
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* Get the name of a function from its trace function number.
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*
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* @param fnNumber The trace number for an ICU function.
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* @return The name string for the function.
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*
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* @see UTraceFunctionNumber
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* @stable ICU 2.8
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*/
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U_STABLE const char * U_EXPORT2
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utrace_functionName(int32_t fnNumber);
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U_CDECL_END
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#endif
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