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+/****************************************************************************
+ *
+ * ftdebug.c
+ *
+ * Debugging and logging component for Win32 (body).
+ *
+ * Copyright (C) 1996-2023 by
+ * David Turner, Robert Wilhelm, and Werner Lemberg.
+ *
+ * This file is part of the FreeType project, and may only be used,
+ * modified, and distributed under the terms of the FreeType project
+ * license, LICENSE.TXT. By continuing to use, modify, or distribute
+ * this file you indicate that you have read the license and
+ * understand and accept it fully.
+ *
+ */
+
+
+ /**************************************************************************
+ *
+ * This component contains various macros and functions used to ease the
+ * debugging of the FreeType engine. Its main purpose is in assertion
+ * checking, tracing, and error detection.
+ *
+ * There are now three debugging modes:
+ *
+ * - trace mode
+ *
+ * Error and trace messages are sent to the log file (which can be the
+ * standard error output).
+ *
+ * - error mode
+ *
+ * Only error messages are generated.
+ *
+ * - release mode:
+ *
+ * No error message is sent or generated. The code is free from any
+ * debugging parts.
+ *
+ */
+
+
+#include <freetype/freetype.h>
+#include <freetype/ftlogging.h>
+#include <freetype/internal/ftdebug.h>
+#include <freetype/internal/ftobjs.h>
+
+
+#ifdef FT_DEBUG_LOGGING
+
+ /**************************************************************************
+ *
+ * Variables used to control logging.
+ *
+ * 1. `ft_default_trace_level` stores the value of trace levels, which are
+ * provided to FreeType using the `FT2_DEBUG` environment variable.
+ *
+ * 2. `ft_fileptr` stores the `FILE*` handle.
+ *
+ * 3. `ft_component` is a string that holds the name of `FT_COMPONENT`.
+ *
+ * 4. The flag `ft_component_flag` prints the name of `FT_COMPONENT` along
+ * with the actual log message if set to true.
+ *
+ * 5. The flag `ft_timestamp_flag` prints time along with the actual log
+ * message if set to ture.
+ *
+ * 6. `ft_have_newline_char` is used to differentiate between a log
+ * message with and without a trailing newline character.
+ *
+ * 7. `ft_custom_trace_level` stores the custom trace level value, which
+ * is provided by the user at run-time.
+ *
+ * We use `static` to avoid 'unused variable' warnings.
+ *
+ */
+ static const char* ft_default_trace_level = NULL;
+ static FILE* ft_fileptr = NULL;
+ static const char* ft_component = NULL;
+ static FT_Bool ft_component_flag = FALSE;
+ static FT_Bool ft_timestamp_flag = FALSE;
+ static FT_Bool ft_have_newline_char = TRUE;
+ static const char* ft_custom_trace_level = NULL;
+
+ /* declared in ftdebug.h */
+
+ dlg_handler ft_default_log_handler = NULL;
+ FT_Custom_Log_Handler custom_output_handler = NULL;
+
+#endif /* FT_DEBUG_LOGGING */
+
+
+#ifdef FT_DEBUG_LEVEL_ERROR
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+
+#ifdef _WIN32_WCE
+
+ FT_LOACAL_DEF( void )
+ OutputDebugStringA( LPCSTR lpOutputString )
+ {
+ int len;
+ LPWSTR lpOutputStringW;
+
+
+ /* allocate memory space for converted string */
+ len = MultiByteToWideChar( CP_ACP, MB_ERR_INVALID_CHARS,
+ lpOutputString, -1, NULL, 0 );
+
+ lpOutputStringW = (LPWSTR)_alloca( len * sizeof ( WCHAR ) );
+
+ if ( !len || !lpOutputStringW )
+ return;
+
+ /* now it is safe to do the translation */
+ MultiByteToWideChar( CP_ACP, MB_ERR_INVALID_CHARS,
+ lpOutputString, -1, lpOutputStringW, len );
+
+ OutputDebugStringW( lpOutputStringW );
+ }
+
+#endif /* _WIN32_WCE */
+
+
+ /* documentation is in ftdebug.h */
+
+ FT_BASE_DEF( void )
+ FT_Message( const char* fmt,
+ ... )
+ {
+ va_list ap;
+
+
+ va_start( ap, fmt );
+ vfprintf( stderr, fmt, ap );
+#if ( defined( _WIN32_WINNT ) && _WIN32_WINNT >= 0x0400 ) || \
+ ( defined( _WIN32_WCE ) && _WIN32_WCE >= 0x0600 )
+ if ( IsDebuggerPresent() )
+ {
+ static char buf[1024];
+
+
+ vsnprintf( buf, sizeof buf, fmt, ap );
+ OutputDebugStringA( buf );
+ }
+#endif
+ va_end( ap );
+ }
+
+
+ /* documentation is in ftdebug.h */
+
+ FT_BASE_DEF( void )
+ FT_Panic( const char* fmt,
+ ... )
+ {
+ va_list ap;
+
+
+ va_start( ap, fmt );
+ vfprintf( stderr, fmt, ap );
+#if ( defined( _WIN32_WINNT ) && _WIN32_WINNT >= 0x0400 ) || \
+ ( defined( _WIN32_WCE ) && _WIN32_WCE >= 0x0600 )
+ if ( IsDebuggerPresent() )
+ {
+ static char buf[1024];
+
+
+ vsnprintf( buf, sizeof buf, fmt, ap );
+ OutputDebugStringA( buf );
+ }
+#endif
+ va_end( ap );
+
+ exit( EXIT_FAILURE );
+ }
+
+
+ /* documentation is in ftdebug.h */
+
+ FT_BASE_DEF( int )
+ FT_Throw( FT_Error error,
+ int line,
+ const char* file )
+ {
+#if 0
+ /* activating the code in this block makes FreeType very chatty */
+ fprintf( stderr,
+ "%s:%d: error 0x%02x: %s\n",
+ file,
+ line,
+ error,
+ FT_Error_String( error ) );
+#else
+ FT_UNUSED( error );
+ FT_UNUSED( line );
+ FT_UNUSED( file );
+#endif
+
+ return 0;
+ }
+
+#endif /* FT_DEBUG_LEVEL_ERROR */
+
+
+#ifdef FT_DEBUG_LEVEL_TRACE
+
+ /* array of trace levels, initialized to 0; */
+ /* this gets adjusted at run-time */
+ static int ft_trace_levels_enabled[trace_count];
+
+ /* array of trace levels, always initialized to 0 */
+ static int ft_trace_levels_disabled[trace_count];
+
+ /* a pointer to either `ft_trace_levels_enabled' */
+ /* or `ft_trace_levels_disabled' */
+ int* ft_trace_levels;
+
+ /* define array of trace toggle names */
+#define FT_TRACE_DEF( x ) #x ,
+
+ static const char* ft_trace_toggles[trace_count + 1] =
+ {
+#include <freetype/internal/fttrace.h>
+ NULL
+ };
+
+#undef FT_TRACE_DEF
+
+
+ /* documentation is in ftdebug.h */
+
+ FT_BASE_DEF( FT_Int )
+ FT_Trace_Get_Count( void )
+ {
+ return trace_count;
+ }
+
+
+ /* documentation is in ftdebug.h */
+
+ FT_BASE_DEF( const char * )
+ FT_Trace_Get_Name( FT_Int idx )
+ {
+ int max = FT_Trace_Get_Count();
+
+
+ if ( idx < max )
+ return ft_trace_toggles[idx];
+ else
+ return NULL;
+ }
+
+
+ /* documentation is in ftdebug.h */
+
+ FT_BASE_DEF( void )
+ FT_Trace_Disable( void )
+ {
+ ft_trace_levels = ft_trace_levels_disabled;
+ }
+
+
+ /* documentation is in ftdebug.h */
+
+ FT_BASE_DEF( void )
+ FT_Trace_Enable( void )
+ {
+ ft_trace_levels = ft_trace_levels_enabled;
+ }
+
+
+ /**************************************************************************
+ *
+ * Initialize the tracing sub-system. This is done by retrieving the
+ * value of the `FT2_DEBUG' environment variable. It must be a list of
+ * toggles, separated by spaces, `;', or `,'. Example:
+ *
+ * export FT2_DEBUG="any:3 memory:7 stream:5"
+ *
+ * This requests that all levels be set to 3, except the trace level for
+ * the memory and stream components which are set to 7 and 5,
+ * respectively.
+ *
+ * See the file `include/freetype/internal/fttrace.h' for details of
+ * the available toggle names.
+ *
+ * The level must be between 0 and 7; 0 means quiet (except for serious
+ * runtime errors), and 7 means _very_ verbose.
+ */
+ FT_BASE_DEF( void )
+ ft_debug_init( void )
+ {
+ const char* ft2_debug = NULL;
+
+
+#ifdef FT_DEBUG_LOGGING
+ if ( ft_custom_trace_level != NULL )
+ ft2_debug = ft_custom_trace_level;
+ else
+ ft2_debug = ft_default_trace_level;
+#else
+ ft2_debug = ft_getenv( "FT2_DEBUG" );
+#endif
+
+ if ( ft2_debug )
+ {
+ const char* p = ft2_debug;
+ const char* q;
+
+
+ for ( ; *p; p++ )
+ {
+ /* skip leading whitespace and separators */
+ if ( *p == ' ' || *p == '\t' || *p == ',' || *p == ';' || *p == '=' )
+ continue;
+
+#ifdef FT_DEBUG_LOGGING
+
+ /* check extra arguments for logging */
+ if ( *p == '-' )
+ {
+ const char* r = ++p;
+
+
+ if ( *r == 'v' )
+ {
+ const char* s = ++r;
+
+
+ ft_component_flag = TRUE;
+
+ if ( *s == 't' )
+ {
+ ft_timestamp_flag = TRUE;
+ p++;
+ }
+
+ p++;
+ }
+
+ else if ( *r == 't' )
+ {
+ const char* s = ++r;
+
+
+ ft_timestamp_flag = TRUE;
+
+ if ( *s == 'v' )
+ {
+ ft_component_flag = TRUE;
+ p++;
+ }
+
+ p++;
+ }
+ }
+
+#endif /* FT_DEBUG_LOGGING */
+
+ /* read toggle name, followed by ':' */
+ q = p;
+ while ( *p && *p != ':' )
+ p++;
+
+ if ( !*p )
+ break;
+
+ if ( *p == ':' && p > q )
+ {
+ FT_Int n, i, len = (FT_Int)( p - q );
+ FT_Int level = -1, found = -1;
+
+
+ for ( n = 0; n < trace_count; n++ )
+ {
+ const char* toggle = ft_trace_toggles[n];
+
+
+ for ( i = 0; i < len; i++ )
+ {
+ if ( toggle[i] != q[i] )
+ break;
+ }
+
+ if ( i == len && toggle[i] == 0 )
+ {
+ found = n;
+ break;
+ }
+ }
+
+ /* read level */
+ p++;
+ if ( *p )
+ {
+ level = *p - '0';
+ if ( level < 0 || level > 7 )
+ level = -1;
+ }
+
+ if ( found >= 0 && level >= 0 )
+ {
+ if ( found == trace_any )
+ {
+ /* special case for `any' */
+ for ( n = 0; n < trace_count; n++ )
+ ft_trace_levels_enabled[n] = level;
+ }
+ else
+ ft_trace_levels_enabled[found] = level;
+ }
+ }
+ }
+ }
+
+ ft_trace_levels = ft_trace_levels_enabled;
+ }
+
+
+#else /* !FT_DEBUG_LEVEL_TRACE */
+
+
+ FT_BASE_DEF( void )
+ ft_debug_init( void )
+ {
+ /* nothing */
+ }
+
+
+ FT_BASE_DEF( FT_Int )
+ FT_Trace_Get_Count( void )
+ {
+ return 0;
+ }
+
+
+ FT_BASE_DEF( const char * )
+ FT_Trace_Get_Name( FT_Int idx )
+ {
+ FT_UNUSED( idx );
+
+ return NULL;
+ }
+
+
+ FT_BASE_DEF( void )
+ FT_Trace_Disable( void )
+ {
+ /* nothing */
+ }
+
+
+ /* documentation is in ftdebug.h */
+
+ FT_BASE_DEF( void )
+ FT_Trace_Enable( void )
+ {
+ /* nothing */
+ }
+
+#endif /* !FT_DEBUG_LEVEL_TRACE */
+
+
+#ifdef FT_DEBUG_LOGGING
+
+ /**************************************************************************
+ *
+ * Initialize and de-initialize 'dlg' library.
+ *
+ */
+
+ FT_BASE_DEF( void )
+ ft_logging_init( void )
+ {
+ ft_default_log_handler = ft_log_handler;
+ ft_default_trace_level = ft_getenv( "FT2_DEBUG" );
+
+ if ( ft_getenv( "FT_LOGGING_FILE" ) )
+ ft_fileptr = ft_fopen( ft_getenv( "FT_LOGGING_FILE" ), "w" );
+ else
+ ft_fileptr = stderr;
+
+ ft_debug_init();
+
+ /* Set the default output handler for 'dlg'. */
+ dlg_set_handler( ft_default_log_handler, NULL );
+ }
+
+
+ FT_BASE_DEF( void )
+ ft_logging_deinit( void )
+ {
+ if ( ft_fileptr != stderr )
+ ft_fclose( ft_fileptr );
+ }
+
+
+ /**************************************************************************
+ *
+ * An output log handler for FreeType.
+ *
+ */
+ FT_BASE_DEF( void )
+ ft_log_handler( const struct dlg_origin* origin,
+ const char* string,
+ void* data )
+ {
+ char features_buf[128];
+ char* bufp = features_buf;
+
+ FT_UNUSED( data );
+
+
+ if ( ft_have_newline_char )
+ {
+ const char* features = NULL;
+ size_t features_length = 0;
+
+
+#define FEATURES_TIMESTAMP "[%h:%m] "
+#define FEATURES_COMPONENT "[%t] "
+#define FEATURES_TIMESTAMP_COMPONENT "[%h:%m %t] "
+
+ if ( ft_timestamp_flag && ft_component_flag )
+ {
+ features = FEATURES_TIMESTAMP_COMPONENT;
+ features_length = sizeof ( FEATURES_TIMESTAMP_COMPONENT );
+ }
+ else if ( ft_timestamp_flag )
+ {
+ features = FEATURES_TIMESTAMP;
+ features_length = sizeof ( FEATURES_TIMESTAMP );
+ }
+ else if ( ft_component_flag )
+ {
+ features = FEATURES_COMPONENT;
+ features_length = sizeof ( FEATURES_COMPONENT );
+ }
+
+ if ( ft_component_flag || ft_timestamp_flag )
+ {
+ ft_strncpy( features_buf, features, features_length );
+ bufp += features_length - 1;
+ }
+
+ if ( ft_component_flag )
+ {
+ size_t tag_length = ft_strlen( *origin->tags );
+ size_t i;
+
+
+ /* To vertically align tracing messages we compensate the */
+ /* different FT_COMPONENT string lengths by inserting an */
+ /* appropriate amount of space characters. */
+ for ( i = 0;
+ i < FT_MAX_TRACE_LEVEL_LENGTH - tag_length;
+ i++ )
+ *bufp++ = ' ';
+ }
+ }
+
+ /* Finally add the format string for the tracing message. */
+ *bufp++ = '%';
+ *bufp++ = 'c';
+ *bufp = '\0';
+
+ dlg_generic_outputf_stream( ft_fileptr,
+ (const char*)features_buf,
+ origin,
+ string,
+ dlg_default_output_styles,
+ true );
+
+ if ( ft_strrchr( string, '\n' ) )
+ ft_have_newline_char = TRUE;
+ else
+ ft_have_newline_char = FALSE;
+ }
+
+
+ /* documentation is in ftdebug.h */
+ FT_BASE_DEF( void )
+ ft_add_tag( const char* tag )
+ {
+ ft_component = tag;
+
+ dlg_add_tag( tag, NULL );
+ }
+
+
+ /* documentation is in ftdebug.h */
+ FT_BASE_DEF( void )
+ ft_remove_tag( const char* tag )
+ {
+ dlg_remove_tag( tag, NULL );
+ }
+
+
+ /* documentation is in ftlogging.h */
+
+ FT_EXPORT_DEF( void )
+ FT_Trace_Set_Level( const char* level )
+ {
+ ft_component_flag = FALSE;
+ ft_timestamp_flag = FALSE;
+ ft_custom_trace_level = level;
+
+ ft_debug_init();
+ }
+
+
+ /* documentation is in ftlogging.h */
+
+ FT_EXPORT_DEF( void )
+ FT_Trace_Set_Default_Level( void )
+ {
+ ft_component_flag = FALSE;
+ ft_timestamp_flag = FALSE;
+ ft_custom_trace_level = NULL;
+
+ ft_debug_init();
+ }
+
+
+ /**************************************************************************
+ *
+ * Functions to handle a custom log handler.
+ *
+ */
+
+ /* documentation is in ftlogging.h */
+
+ FT_EXPORT_DEF( void )
+ FT_Set_Log_Handler( FT_Custom_Log_Handler handler )
+ {
+ custom_output_handler = handler;
+ }
+
+
+ /* documentation is in ftlogging.h */
+
+ FT_EXPORT_DEF( void )
+ FT_Set_Default_Log_Handler( void )
+ {
+ custom_output_handler = NULL;
+ }
+
+
+ /* documentation is in ftdebug.h */
+ FT_BASE_DEF( void )
+ FT_Logging_Callback( const char* fmt,
+ ... )
+ {
+ va_list ap;
+
+
+ va_start( ap, fmt );
+ custom_output_handler( ft_component, fmt, ap );
+ va_end( ap );
+ }
+
+#else /* !FT_DEBUG_LOGGING */
+
+ FT_EXPORT_DEF( void )
+ FT_Trace_Set_Level( const char* level )
+ {
+ FT_UNUSED( level );
+ }
+
+
+ FT_EXPORT_DEF( void )
+ FT_Trace_Set_Default_Level( void )
+ {
+ /* nothing */
+ }
+
+
+ FT_EXPORT_DEF( void )
+ FT_Set_Log_Handler( FT_Custom_Log_Handler handler )
+ {
+ FT_UNUSED( handler );
+ }
+
+
+ FT_EXPORT_DEF( void )
+ FT_Set_Default_Log_Handler( void )
+ {
+ /* nothing */
+ }
+
+#endif /* !FT_DEBUG_LOGGING */
+
+
+/* END */