utrace.h

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00001 /*
00002 *******************************************************************************
00003 *
00004 *   Copyright (C) 2003-2012, International Business Machines
00005 *   Corporation and others.  All Rights Reserved.
00006 *
00007 *******************************************************************************
00008 *   file name:  utrace.h
00009 *   encoding:   US-ASCII
00010 *   tab size:   8 (not used)
00011 *   indentation:4
00012 *
00013 *   created on: 2003aug06
00014 *   created by: Markus W. Scherer
00015 *
00016 *   Definitions for ICU tracing/logging.
00017 *
00018 */
00019 
00020 #ifndef __UTRACE_H__
00021 #define __UTRACE_H__
00022 
00023 #include <stdarg.h>
00024 #include "unicode/utypes.h"
00025 
00037 U_CDECL_BEGIN
00038 
00044 typedef enum UTraceLevel {
00046     UTRACE_OFF=-1,
00048     UTRACE_ERROR=0,
00050     UTRACE_WARNING=3,
00052     UTRACE_OPEN_CLOSE=5,
00054     UTRACE_INFO=7,
00056     UTRACE_VERBOSE=9
00057 } UTraceLevel;
00058 
00063 typedef enum UTraceFunctionNumber {
00064     UTRACE_FUNCTION_START=0,
00065     UTRACE_U_INIT=UTRACE_FUNCTION_START,
00066     UTRACE_U_CLEANUP,
00067     UTRACE_FUNCTION_LIMIT,
00068 
00069     UTRACE_CONVERSION_START=0x1000,
00070     UTRACE_UCNV_OPEN=UTRACE_CONVERSION_START,
00071     UTRACE_UCNV_OPEN_PACKAGE,
00072     UTRACE_UCNV_OPEN_ALGORITHMIC,
00073     UTRACE_UCNV_CLONE,
00074     UTRACE_UCNV_CLOSE,
00075     UTRACE_UCNV_FLUSH_CACHE,
00076     UTRACE_UCNV_LOAD,
00077     UTRACE_UCNV_UNLOAD,
00078     UTRACE_CONVERSION_LIMIT,
00079 
00080     UTRACE_COLLATION_START=0x2000,
00081     UTRACE_UCOL_OPEN=UTRACE_COLLATION_START,
00082     UTRACE_UCOL_CLOSE,
00083     UTRACE_UCOL_STRCOLL,
00084     UTRACE_UCOL_GET_SORTKEY,
00085     UTRACE_UCOL_GETLOCALE,
00086     UTRACE_UCOL_NEXTSORTKEYPART,
00087     UTRACE_UCOL_STRCOLLITER,
00088     UTRACE_UCOL_OPEN_FROM_SHORT_STRING,
00089     UTRACE_UCOL_STRCOLLUTF8, 
00090     UTRACE_COLLATION_LIMIT
00091 } UTraceFunctionNumber;
00092 
00098 U_STABLE void U_EXPORT2
00099 utrace_setLevel(int32_t traceLevel);
00100 
00106 U_STABLE int32_t U_EXPORT2
00107 utrace_getLevel(void);
00108 
00109 /* Trace function pointers types  ----------------------------- */
00110 
00117 typedef void U_CALLCONV
00118 UTraceEntry(const void *context, int32_t fnNumber);
00119 
00133 typedef void U_CALLCONV
00134 UTraceExit(const void *context, int32_t fnNumber, 
00135            const char *fmt, va_list args);
00136 
00148 typedef void U_CALLCONV
00149 UTraceData(const void *context, int32_t fnNumber, int32_t level,
00150            const char *fmt, va_list args);
00151 
00180 U_STABLE void U_EXPORT2
00181 utrace_setFunctions(const void *context,
00182                     UTraceEntry *e, UTraceExit *x, UTraceData *d);
00183 
00194 U_STABLE void U_EXPORT2
00195 utrace_getFunctions(const void **context,
00196                     UTraceEntry **e, UTraceExit **x, UTraceData **d);
00197 
00198 
00199 
00200 /*
00201  *
00202  * ICU trace format string syntax
00203  *
00204  * Format Strings are passed to UTraceData functions, and define the
00205  * number and types of the trace data being passed on each call.
00206  *
00207  * The UTraceData function, which is supplied by the application,
00208  * not by ICU, can either forward the trace data (passed via
00209  * varargs) and the format string back to ICU for formatting into
00210  * a displayable string, or it can interpret the format itself,
00211  * and do as it wishes with the trace data.
00212  *
00213  *
00214  * Goals for the format string
00215  * - basic data output
00216  * - easy to use for trace programmer
00217  * - sufficient provision for data types for trace output readability
00218  * - well-defined types and binary portable APIs
00219  *
00220  * Non-goals
00221  * - printf compatibility
00222  * - fancy formatting
00223  * - argument reordering and other internationalization features
00224  *
00225  * ICU trace format strings contain plain text with argument inserts,
00226  * much like standard printf format strings.
00227  * Each insert begins with a '%', then optionally contains a 'v',
00228  * then exactly one type character.
00229  * Two '%' in a row represent a '%' instead of an insert.
00230  * The trace format strings need not have \n at the end.
00231  *
00232  *
00233  * Types
00234  * -----
00235  *
00236  * Type characters:
00237  * - c A char character in the default codepage.
00238  * - s A NUL-terminated char * string in the default codepage.
00239  * - S A UChar * string.  Requires two params, (ptr, length).  Length=-1 for nul term.
00240  * - b A byte (8-bit integer).
00241  * - h A 16-bit integer.  Also a 16 bit Unicode code unit.
00242  * - d A 32-bit integer.  Also a 20 bit Unicode code point value. 
00243  * - l A 64-bit integer.
00244  * - p A data pointer.
00245  *
00246  * Vectors
00247  * -------
00248  *
00249  * If the 'v' is not specified, then one item of the specified type
00250  * is passed in.
00251  * If the 'v' (for "vector") is specified, then a vector of items of the
00252  * specified type is passed in, via a pointer to the first item
00253  * and an int32_t value for the length of the vector.
00254  * Length==-1 means zero or NUL termination.  Works for vectors of all types.
00255  *
00256  * Note:  %vS is a vector of (UChar *) strings.  The strings must
00257  *        be nul terminated as there is no way to provide a
00258  *        separate length parameter for each string.  The length
00259  *        parameter (required for all vectors) is the number of
00260  *        strings, not the length of the strings.
00261  *
00262  * Examples
00263  * --------
00264  *
00265  * These examples show the parameters that will be passed to an application's
00266  *   UTraceData() function for various formats.
00267  *
00268  * - the precise formatting is up to the application!
00269  * - the examples use type casts for arguments only to _show_ the types of
00270  *   arguments without needing variable declarations in the examples;
00271  *   the type casts will not be necessary in actual code
00272  *
00273  * UTraceDataFunc(context, fnNumber, level,
00274  *              "There is a character %c in the string %s.",   // Format String 
00275  *              (char)c, (const char *)s);                     // varargs parameters
00276  * ->   There is a character 0x42 'B' in the string "Bravo".
00277  *
00278  * UTraceDataFunc(context, fnNumber, level,
00279  *              "Vector of bytes %vb vector of chars %vc",
00280  *              (const uint8_t *)bytes, (int32_t)bytesLength,
00281  *              (const char *)chars, (int32_t)charsLength);
00282  * ->  Vector of bytes
00283  *      42 63 64 3f [4]
00284  *     vector of chars
00285  *      "Bcd?"[4]
00286  *
00287  * UTraceDataFunc(context, fnNumber, level,
00288  *              "An int32_t %d and a whole bunch of them %vd",
00289  *              (int32_t)-5, (const int32_t *)ints, (int32_t)intsLength);
00290  * ->   An int32_t 0xfffffffb and a whole bunch of them
00291  *      fffffffb 00000005 0000010a [3]
00292  *
00293  */
00294 
00295 
00296 
00316 U_STABLE int32_t U_EXPORT2
00317 utrace_vformat(char *outBuf, int32_t capacity,
00318               int32_t indent, const char *fmt,  va_list args);
00319 
00337 U_STABLE int32_t U_EXPORT2
00338 utrace_format(char *outBuf, int32_t capacity,
00339               int32_t indent, const char *fmt,  ...);
00340 
00341 
00342 
00343 /* Trace function numbers --------------------------------------------------- */
00344 
00354 U_STABLE const char * U_EXPORT2
00355 utrace_functionName(int32_t fnNumber);
00356 
00357 U_CDECL_END
00358 
00359 #endif

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