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Diffstat (limited to 'src/tools/tqglobal.cpp')
| -rw-r--r-- | src/tools/tqglobal.cpp | 889 |
1 files changed, 889 insertions, 0 deletions
diff --git a/src/tools/tqglobal.cpp b/src/tools/tqglobal.cpp new file mode 100644 index 000000000..d33bfdf95 --- /dev/null +++ b/src/tools/tqglobal.cpp @@ -0,0 +1,889 @@ +/**************************************************************************** +** +** Global functions +** +** Created : 920604 +** +** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved. +** +** This file is part of the tools module of the TQt GUI Toolkit. +** +** This file may be used under the terms of the GNU General +** Public License versions 2.0 or 3.0 as published by the Free +** Software Foundation and appearing in the files LICENSE.GPL2 +** and LICENSE.GPL3 included in the packaging of this file. +** Alternatively you may (at your option) use any later version +** of the GNU General Public License if such license has been +** publicly approved by Trolltech ASA (or its successors, if any) +** and the KDE Free TQt Foundation. +** +** Please review the following information to ensure GNU General +** Public Licensing requirements will be met: +** http://trolltech.com/products/qt/licenses/licensing/opensource/. +** If you are unsure which license is appropriate for your use, please +** review the following information: +** http://trolltech.com/products/qt/licenses/licensing/licensingoverview +** or contact the sales department at sales@trolltech.com. +** +** This file may be used under the terms of the Q Public License as +** defined by Trolltech ASA and appearing in the file LICENSE.TQPL +** included in the packaging of this file. Licensees holding valid TQt +** Commercial licenses may use this file in accordance with the TQt +** Commercial License Agreement provided with the Software. +** +** This file is provided "AS IS" with NO WARRANTY OF ANY KIND, +** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted +** herein. +** +**********************************************************************/ + +#include "qplatformdefs.h" + +#include "tqasciidict.h" +#include <tqdatetime.h> +#include <limits.h> +#include <stdio.h> +#include <limits.h> +#include <stdarg.h> +#include <stdlib.h> + +#if defined(Q_CC_MSVC) && !defined(Q_CC_MSVC_NET) && !defined(Q_OS_TEMP) +#include <crtdbg.h> +#endif + + +/*! + \relates TQApplication + + Returns the TQt version number as a string, for example, "2.3.0" or + "3.0.5". + + The \c TQT_VERSION define has the numeric value in the form: + 0xmmiibb (m = major, i = minor, b = bugfix). For example, TQt + 3.0.5's \c TQT_VERSION is 0x030005. +*/ + +const char *tqVersion() +{ + return TQT_VERSION_STR; +} + +bool tqSharedBuild() +{ +#ifdef QT_SHARED + return TRUE; +#else + return FALSE; +#endif +} + +/***************************************************************************** + System detection routines + *****************************************************************************/ + +static bool si_alreadyDone = FALSE; +static int si_wordSize; +static bool si_bigEndian; + +/*! + \relates TQApplication + + Obtains information about the system. + + The system's word size in bits (typically 32) is returned in \a + *wordSize. The \a *bigEndian is set to TRUE if this is a big-endian + machine, or to FALSE if this is a little-endian machine. + + In debug mode, this function calls tqFatal() with a message if the + computer is truly weird (i.e. different endianness for 16 bit and + 32 bit integers); in release mode it returns FALSE. +*/ + +bool tqSysInfo( int *wordSize, bool *bigEndian ) +{ +#if defined(QT_CHECK_NULL) + Q_ASSERT( wordSize != 0 ); + Q_ASSERT( bigEndian != 0 ); +#endif + + if ( si_alreadyDone ) { // run it only once + *wordSize = si_wordSize; + *bigEndian = si_bigEndian; + return TRUE; + } + + si_wordSize = 0; + TQ_ULONG n = (TQ_ULONG)(~0); + while ( n ) { // detect word size + si_wordSize++; + n /= 2; + } + *wordSize = si_wordSize; + + if ( *wordSize != 64 && + *wordSize != 32 && + *wordSize != 16 ) { // word size: 16, 32 or 64 +#if defined(QT_CHECK_RANGE) + tqFatal( "qSysInfo: Unsupported system word size %d", *wordSize ); +#endif + return FALSE; + } + if ( sizeof(TQ_INT8) != 1 || sizeof(TQ_INT16) != 2 || sizeof(TQ_INT32) != 4 || + sizeof(TQ_ULONG)*8 != si_wordSize || sizeof(float) != 4 || sizeof(double) != 8 ) { +#if defined(QT_CHECK_RANGE) + tqFatal( "qSysInfo: Unsupported system data type size" ); +#endif + return FALSE; + } + + bool be16, be32; // determine byte ordering + short ns = 0x1234; + int nl = 0x12345678; + + unsigned char *p = (unsigned char *)(&ns); // 16-bit integer + be16 = *p == 0x12; + + p = (unsigned char *)(&nl); // 32-bit integer + if ( p[0] == 0x12 && p[1] == 0x34 && p[2] == 0x56 && p[3] == 0x78 ) + be32 = TRUE; + else + if ( p[0] == 0x78 && p[1] == 0x56 && p[2] == 0x34 && p[3] == 0x12 ) + be32 = FALSE; + else + be32 = !be16; + + if ( be16 != be32 ) { // strange machine! +#if defined(QT_CHECK_RANGE) + tqFatal( "qSysInfo: Inconsistent system byte order" ); +#endif + return FALSE; + } + + *bigEndian = si_bigEndian = be32; + si_alreadyDone = TRUE; + return TRUE; +} + +#if defined(Q_OS_MAC) + +#include "qt_mac.h" + +// This function has descended from Apple Source Code (FSpLocationFromFullPath), +// but changes have been made. [Creates a minimal alias from the full pathname] +OSErr qt_mac_create_fsspec(const TQString &file, FSSpec *spec) +{ + FSRef fref; + TQCString utfs = file.utf8(); + OSErr ret = FSPathMakeRef((const UInt8 *)utfs.data(), &fref, NULL); + if(ret == noErr) + ret = FSGetCatalogInfo(&fref, kFSCatInfoNone, NULL, NULL, spec, NULL); + return ret; +} + +CFStringRef tqstring2cfstring(const TQString &str) +{ + return CFStringCreateWithCharacters(0, (UniChar *)str.unicode(), str.length()); +} + +TQString cfstring2qstring(CFStringRef str) +{ + if(!str) + return TQString(); + + CFIndex length = CFStringGetLength(str); + if(const UniChar *chars = CFStringGetCharactersPtr(str)) + return TQString((TQChar *)chars, length); + UniChar *buffer = (UniChar*)malloc(length * sizeof(UniChar)); + CFStringGetCharacters(str, CFRangeMake(0, length), buffer); + TQString ret((TQChar *)buffer, length); + free(buffer); + return ret; +} + +unsigned char *p_str(const TQString &s) +{ + CFStringRef cfstr = tqstring2cfstring(s); + uchar *p = (uchar*)malloc(256); + CFStringGetPascalString(cfstr, p, 256, CFStringGetSystemEncoding()); + CFRelease(cfstr); + return p; +} + +TQString p2qstring(const unsigned char *c) { + CFStringRef cfstr = CFStringCreateWithPascalString(0, c, CFStringGetSystemEncoding()); + TQString str = cfstring2qstring(cfstr); + CFRelease(cfstr); + return str; +} + +int qMacVersion() +{ + static int macver = TQt::MV_Unknown; + static bool first = TRUE; + if(first) { + first = FALSE; + long gestalt_version; + if(Gestalt(gestaltSystemVersion, &gestalt_version) == noErr) { + macver = ((gestalt_version & 0x00f0) >> 4) + 2; + + } + } + return macver; +} +TQt::MacintoshVersion qt_macver = (TQt::MacintoshVersion)qMacVersion(); + +// HFS+ filesystems use decomposing unicode for certain layers in unicode +// In general these don't look great as a user visible string. +// Therefore it is a good idea to normalize them ourselves. +// These technotes on Apple's website: +// http://developer.apple.com/qa/qa2001/qa1235.html +// http://developer.apple.com/qa/qa2001/qa1173.html +TQString qt_mac_precomposeFileName(const TQString &str) +{ + if (str.isEmpty()) + return str; + int strLength = str.length(); + CFMutableStringRef cfmstr = CFStringCreateMutable(0, strLength); + CFStringAppendCharacters(cfmstr, (UniChar *)str.unicode(), strLength); + CFStringNormalize(cfmstr, kCFStringNormalizationFormC); + TQString newStr = cfstring2qstring(cfmstr); + CFRelease(cfmstr); + return newStr; +} +#elif defined(Q_OS_WIN32) || defined(Q_OS_CYGWIN) || defined(Q_OS_TEMP) +bool qt_winunicode; +# ifdef Q_OS_TEMP + DWORD qt_cever = 0; +# endif // Q_OS_TEMP + +#include "qt_windows.h" + +int qWinVersion() +{ +#ifndef VER_PLATFORM_WIN32s +#define VER_PLATFORM_WIN32s 0 +#endif +#ifndef VER_PLATFORM_WIN32_WINDOWS +#define VER_PLATFORM_WIN32_WINDOWS 1 +#endif +#ifndef VER_PLATFORM_WIN32_NT +#define VER_PLATFORM_WIN32_NT 2 +#endif +#ifndef VER_PLATFORM_WIN32_CE +#define VER_PLATFORM_WIN32_CE 3 +#endif + + static int winver = TQt::WV_NT; + static int t=0; + if ( !t ) { + t=1; +#ifndef Q_OS_TEMP + OSVERSIONINFOA osver; + osver.dwOSVersionInfoSize = sizeof(osver); + GetVersionExA( &osver ); +#else + OSVERSIONINFOW osver; + osver.dwOSVersionInfoSize = sizeof(osver); + GetVersionEx( &osver ); + qt_cever = osver.dwMajorVersion * 100; + qt_cever += osver.dwMinorVersion * 10; +#endif + switch ( osver.dwPlatformId ) { + case VER_PLATFORM_WIN32s: + winver = TQt::WV_32s; + break; + case VER_PLATFORM_WIN32_WINDOWS: + // We treat Windows Me (minor 90) the same as Windows 98 + if ( osver.dwMinorVersion == 90 ) + winver = TQt::WV_Me; + else if ( osver.dwMinorVersion == 10 ) + winver = TQt::WV_98; + else + winver = TQt::WV_95; + break; + case VER_PLATFORM_WIN32_CE: +#ifdef Q_OS_TEMP + if ( qt_cever >= 400 ) + winver = TQt::WV_CENET; + else +#endif + winver = TQt::WV_CE; + break; + default: // VER_PLATFORM_WIN32_NT + if ( osver.dwMajorVersion < 5 ) { + winver = TQt::WV_NT; + } else if (osver.dwMajorVersion == 6) { + winver = TQt::WV_VISTA; + } else if ( osver.dwMinorVersion == 0 ) { + winver = TQt::WV_2000; + } else if ( osver.dwMinorVersion == 1 ) { + winver = TQt::WV_XP; + } else if ( osver.dwMinorVersion == 2 ) { + winver = TQt::WV_2003; + } else { + tqWarning("Untested Windows version detected!"); + winver = TQt::WV_NT_based; + } + } + } + +#if defined(UNICODE) + if ( winver & TQt::WV_NT_based ) + qt_winunicode = TRUE; + else +#endif + qt_winunicode = FALSE; + + return winver; +} + +TQt::WindowsVersion qt_winver = (TQt::WindowsVersion)qWinVersion(); +#endif + + +/***************************************************************************** + Debug output routines + *****************************************************************************/ + +/*! + \fn void tqDebug( const char *msg, ... ) + + \relates TQApplication + + Prints a debug message \a msg, or calls the message handler (if it + has been installed). + + This function takes a format string and a list of arguments, + similar to the C printf() function. + + Example: + \code + tqDebug( "my window handle = %x", myWidget->id() ); + \endcode + + Under X11, the text is printed to stderr. Under Windows, the text + is sent to the debugger. + + \warning The internal buffer is limited to 8196 bytes (including + the '\0'-terminator). + + \warning Passing (const char *)0 as argument to tqDebug might lead + to crashes on certain platforms due to the platforms printf implementation. + + \sa tqWarning(), tqFatal(), qInstallMsgHandler(), + \link debug.html Debugging\endlink +*/ + +/*! + \fn void tqWarning( const char *msg, ... ) + + \relates TQApplication + + Prints a warning message \a msg, or calls the message handler (if + it has been installed). + + This function takes a format string and a list of arguments, + similar to the C printf() function. + + Example: + \code + void f( int c ) + { + if ( c > 200 ) + tqWarning( "f: bad argument, c == %d", c ); + } + \endcode + + Under X11, the text is printed to stderr. Under Windows, the text + is sent to the debugger. + + \warning The internal buffer is limited to 8196 bytes (including + the '\0'-terminator). + + \warning Passing (const char *)0 as argument to tqWarning might lead + to crashes on certain platforms due to the platforms printf implementation. + + \sa tqDebug(), tqFatal(), qInstallMsgHandler(), + \link debug.html Debugging\endlink +*/ + +/*! + \fn void tqFatal( const char *msg, ... ) + + \relates TQApplication + + Prints a fatal error message \a msg and exits, or calls the + message handler (if it has been installed). + + This function takes a format string and a list of arguments, + similar to the C printf() function. + + Example: + \code + int divide( int a, int b ) + { + if ( b == 0 ) // program error + tqFatal( "divide: cannot divide by zero" ); + return a/b; + } + \endcode + + Under X11, the text is printed to stderr. Under Windows, the text + is sent to the debugger. + + \warning The internal buffer is limited to 8196 bytes (including + the '\0'-terminator). + + \warning Passing (const char *)0 as argument to tqFatal might lead + to crashes on certain platforms due to the platforms printf implementation. + + \sa tqDebug(), tqWarning(), qInstallMsgHandler(), + \link debug.html Debugging\endlink +*/ + + +static TQtMsgHandler handler = 0; // pointer to debug handler +static const int QT_BUFFER_LENGTH = 8196; // internal buffer length + + +#ifdef Q_CC_MWERKS + +#include "qt_mac.h" + +extern bool tqt_is_gui_used; +static void mac_default_handler( const char *msg ) +{ + if ( tqt_is_gui_used ) { + const unsigned char *p = p_str(msg); + DebugStr(p); + free((void*)p); + } else { + fprintf( stderr, msg ); + } +} + +#endif + +void handle_buffer(const char *buf, TQtMsgType msgType) +{ + if ( handler ) { + (*handler)( msgType, buf ); + } else if (msgType == TQtFatalMsg) { +#if defined(Q_CC_MWERKS) + mac_default_handler(buf); +#else + fprintf( stderr, "%s\n", buf ); // add newline +#endif +#if defined(Q_OS_UNIX) && defined(QT_DEBUG) + abort(); // trap; generates core dump +#elif defined(Q_OS_TEMP) && defined(QT_DEBUG) + TQString fstr; + fstr.sprintf( "%s:%s %s %s\n", __FILE__, __LINE__, TQT_VERSION_STR, buf ); + OutputDebugString( fstr.ucs2() ); +#elif defined(_CRT_ERROR) && defined(_DEBUG) + _CrtDbgReport( _CRT_ERROR, __FILE__, __LINE__, TQT_VERSION_STR, buf ); +#else + exit( 1 ); // goodbye cruel world +#endif + } else { +#if defined(Q_CC_MWERKS) + mac_default_handler(buf); +#elif defined(Q_OS_TEMP) + TQString fstr( buf ); + OutputDebugString( (fstr + "\n").ucs2() ); +#else + fprintf( stderr, "%s\n", buf ); // add newline +#endif + } +} + +void tqDebug( const TQString &msg ) +{ + char buf[QT_BUFFER_LENGTH]; + strcpy( buf, TQDateTime::currentDateTime().toString("[yyyy/MM/dd hh:mm:ss.zzz] ").local8Bit() ); + int len = strlen(buf); + strncpy( &buf[len], msg.local8Bit(), QT_BUFFER_LENGTH - len - 1 ); + len += msg.length(); + if (len >= QT_BUFFER_LENGTH) { + len = QT_BUFFER_LENGTH - 1; + } + buf[len] = '\0'; + handle_buffer(buf, TQtDebugMsg); +} + +void tqDebug( const char *msg, ... ) +{ + char buf[QT_BUFFER_LENGTH]; + strcpy( buf, TQDateTime::currentDateTime().toString("[yyyy/MM/dd hh:mm:ss.zzz] ").local8Bit() ); + int len = strlen(buf); + va_list ap; + va_start( ap, msg ); // use variable arg list +#if defined(QT_VSNPRINTF) + QT_VSNPRINTF( &buf[len], QT_BUFFER_LENGTH-len, msg, ap ); +#else + vsprintf( &buf[len], msg, ap ); +#endif + va_end( ap ); + handle_buffer(buf, TQtDebugMsg); +} + +void tqDebug( const TQCString &s ) +{ + tqDebug("%s", s.data()); +} + +void tqWarning( const TQString &msg ) +{ + char buf[QT_BUFFER_LENGTH]; + strcpy( buf, TQDateTime::currentDateTime().toString("[yyyy/MM/dd hh:mm:ss.zzz] ").local8Bit() ); + int len = strlen(buf); + strncpy( &buf[len], msg.local8Bit(), QT_BUFFER_LENGTH - len - 1 ); + len += msg.length(); + if (len >= QT_BUFFER_LENGTH) { + len = QT_BUFFER_LENGTH - 1; + } + buf[len] = '\0'; + handle_buffer(buf, TQtWarningMsg); +} + +void tqWarning( const char *msg, ... ) +{ + char buf[QT_BUFFER_LENGTH]; + strcpy( buf, TQDateTime::currentDateTime().toString("[yyyy/MM/dd hh:mm:ss.zzz] ").local8Bit() ); + int len = strlen(buf); + va_list ap; + va_start( ap, msg ); // use variable arg list +#if defined(QT_VSNPRINTF) + QT_VSNPRINTF( &buf[len], QT_BUFFER_LENGTH-len, msg, ap ); +#else + vsprintf( &buf[len], msg, ap ); +#endif + va_end( ap ); + handle_buffer(buf, TQtWarningMsg); +} + +void tqWarning( const TQCString &s ) +{ + tqWarning("%s", s.data()); +} + +void tqFatal( const TQString &msg ) +{ + char buf[QT_BUFFER_LENGTH]; + strcpy( buf, TQDateTime::currentDateTime().toString("[yyyy/MM/dd hh:mm:ss.zzz] ").local8Bit() ); + int len = strlen(buf); + strncpy( &buf[len], msg.local8Bit(), QT_BUFFER_LENGTH - len - 1 ); + len += msg.length(); + if (len >= QT_BUFFER_LENGTH) { + len = QT_BUFFER_LENGTH - 1; + } + buf[len] = '\0'; + handle_buffer(buf, TQtFatalMsg); +} + +void tqFatal( const char *msg, ... ) +{ + char buf[QT_BUFFER_LENGTH]; + strcpy( buf, TQDateTime::currentDateTime().toString("[yyyy/MM/dd hh:mm:ss.zzz] ").local8Bit() ); + int len = strlen(buf); + va_list ap; + va_start( ap, msg ); // use variable arg list +#if defined(QT_VSNPRINTF) + QT_VSNPRINTF( &buf[len], QT_BUFFER_LENGTH-len, msg, ap ); +#else + vsprintf( &buf[len], msg, ap ); +#endif + va_end( ap ); + handle_buffer(buf, TQtFatalMsg); +} + +void tqFatal( const TQCString &s ) +{ + tqWarning("%s", s.data()); +} + +/*! + \relates TQApplication + + Prints the message \a msg and uses \a code to get a system specific + error message. When \a code is -1 (the default), the system's last + error code will be used if possible. Use this method to handle + failures in platform specific API calls. + + This function does nothing when TQt is built with \c TQT_NO_DEBUG + defined. +*/ +void tqSystemWarning( const char* msg, int code ) +{ +#ifndef TQT_NO_DEBUG +#if defined(Q_OS_WIN32) + if ( code == -1 ) + code = GetLastError(); + + if ( !code ) + return; + + unsigned short *string; + QT_WA( { + FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM, + NULL, + code, + MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), + (LPTSTR)&string, + 0, + NULL ); + + tqWarning( "%s\n\tError code %d - %s", msg, code, TQString::fromUcs2(string).latin1() ); + }, { + FormatMessageA( FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM, + NULL, + code, + MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), + (char*)&string, + 0, + NULL ); + + tqWarning( "%s\n\tError code %d - %s", msg, code, (const char*)string ); + } ); + LocalFree( (HLOCAL)string ); +#else + if ( code != -1 ) + tqWarning( "%s\n\tError code %d - %s", msg, code, strerror( code ) ); + else + tqWarning( "%s", msg ); +#endif +#else + Q_UNUSED( msg ); + Q_UNUSED( code ); +#endif +} + +/*! + \fn void Q_ASSERT( bool test ) + + \relates TQApplication + + Prints a warning message containing the source code file name and + line number if \a test is FALSE. + + This is really a macro defined in \c tqglobal.h. + + Q_ASSERT is useful for testing pre- and post-conditions. + + Example: + \code + // + // File: div.cpp + // + + #include <tqglobal.h> + + int divide( int a, int b ) + { + Q_ASSERT( b != 0 ); // this is line 9 + return a/b; + } + \endcode + + If \c b is zero, the Q_ASSERT statement will output the following + message using the tqWarning() function: + \code + ASSERT: "b != 0" in div.cpp (9) + \endcode + + \sa tqWarning(), \link debug.html Debugging\endlink +*/ + + +/*! + \fn void TQ_CHECK_PTR( void *p ) + + \relates TQApplication + + If \a p is 0, prints a warning message containing the source code file + name and line number, saying that the program ran out of memory. + + This is really a macro defined in \c tqglobal.h. + + Example: + \code + int *a; + + TQ_CHECK_PTR( a = new int[80] ); // WRONG! + + a = new (nothrow) int[80]; // Right + TQ_CHECK_PTR( a ); + \endcode + + \sa tqWarning(), \link debug.html Debugging\endlink +*/ + + +// +// The TQ_CHECK_PTR macro calls this function to check if an allocation went ok. +// +bool tqt_check_pointer( bool c, const char *n, int l ) +{ + if ( c ) + tqWarning( "In file %s, line %d: Out of memory", n, l ); + return TRUE; +} + + +static bool firstObsoleteWarning(const char *obj, const char *oldfunc ) +{ + static TQAsciiDict<int> *obsoleteDict = 0; + if ( !obsoleteDict ) { // first time func is called + obsoleteDict = new TQAsciiDict<int>; +#if defined(QT_DEBUG) + tqDebug( + "You are using obsolete functions in the TQt library. Call the function\n" + "qSuppressObsoleteWarnings() to suppress obsolete warnings.\n" + ); +#endif + } + TQCString s( obj ); + s += "::"; + s += oldfunc; + if ( obsoleteDict->find(s.data()) == 0 ) { + obsoleteDict->insert( s.data(), (int*)1 ); // anything different from 0 + return TRUE; + } + return FALSE; +} + +static bool suppressObsolete = FALSE; + +void tqSuppressObsoleteWarnings( bool suppress ) +{ + suppressObsolete = suppress; +} + +void tqObsolete( const char *obj, const char *oldfunc, const char *newfunc ) +{ + if ( suppressObsolete ) + return; + if ( !firstObsoleteWarning(obj, oldfunc) ) + return; + if ( obj ) + tqDebug( "%s::%s: This function is obsolete, use %s instead.", + obj, oldfunc, newfunc ); + else + tqDebug( "%s: This function is obsolete, use %s instead.", + oldfunc, newfunc ); +} + +void tqObsolete( const char *obj, const char *oldfunc ) +{ + if ( suppressObsolete ) + return; + if ( !firstObsoleteWarning(obj, oldfunc) ) + return; + if ( obj ) + tqDebug( "%s::%s: This function is obsolete.", obj, oldfunc ); + else + tqDebug( "%s: This function is obsolete.", oldfunc ); +} + +void tqObsolete( const char *message ) +{ + if ( suppressObsolete ) + return; + if ( !firstObsoleteWarning( "TQt", message) ) + return; + tqDebug( "%s", message ); +} + + +/*! + \relates TQApplication + + Installs a TQt message handler \a h. Returns a pointer to the + message handler previously defined. + + The message handler is a function that prints out debug messages, + warnings and fatal error messages. The TQt library (debug version) + contains hundreds of warning messages that are printed when + internal errors (usually invalid function arguments) occur. If you + implement your own message handler, you get total control of these + messages. + + The default message handler prints the message to the standard + output under X11 or to the debugger under Windows. If it is a + fatal message, the application aborts immediately. + + Only one message handler can be defined, since this is usually + done on an application-wide basis to control debug output. + + To restore the message handler, call \c qInstallMsgHandler(0). + + Example: + \code + #include <ntqapplication.h> + #include <stdio.h> + #include <stdlib.h> + + void myMessageOutput( TQtMsgType type, const char *msg ) + { + switch ( type ) { + case TQtDebugMsg: + fprintf( stderr, "Debug: %s\n", msg ); + break; + case TQtWarningMsg: + fprintf( stderr, "Warning: %s\n", msg ); + break; + case TQtFatalMsg: + fprintf( stderr, "Fatal: %s\n", msg ); + abort(); // deliberately core dump + } + } + + int main( int argc, char **argv ) + { + qInstallMsgHandler( myMessageOutput ); + TQApplication a( argc, argv ); + ... + return a.exec(); + } + \endcode + + \sa tqDebug(), tqWarning(), tqFatal(), \link debug.html Debugging\endlink +*/ + +TQtMsgHandler qInstallMsgHandler( TQtMsgHandler h ) +{ + TQtMsgHandler old = handler; + handler = h; + return old; +} + + +/* + Dijkstra's bisection algorithm to find the square root as an integer. + Deliberately not exported as part of the TQt API, but used in + tqsimplerichtext.cpp +*/ +unsigned int qt_int_sqrt( unsigned int n ) +{ + // n must be in the range 0...UINT_MAX/2-1 + if ( n >= ( UINT_MAX>>2 ) ) { + unsigned int r = 2 * qt_int_sqrt( n / 4 ); + unsigned int r2 = r + 1; + return ( n >= r2 * r2 ) ? r2 : r; + } + uint h, p= 0, q= 1, r= n; + while ( q <= n ) + q <<= 2; + while ( q != 1 ) { + q >>= 2; + h= p + q; + p >>= 1; + if ( r >= h ) { + p += q; + r -= h; + } + } + return p; +} + |