/**************************************************************************** * * ftdebug.c * * Debugging and logging component (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 /* 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 ); 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 ); 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 … 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 ) { … } FT_BASE_DEF( FT_Int ) FT_Trace_Get_Count( void ) { … } FT_BASE_DEF( const char * ) FT_Trace_Get_Name( FT_Int idx ) { … } FT_BASE_DEF( void ) FT_Trace_Disable( void ) { … } /* documentation is in ftdebug.h */ FT_BASE_DEF( void ) FT_Trace_Enable( void ) { … } #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 … #define FEATURES_COMPONENT … #define FEATURES_TIMESTAMP_COMPONENT … 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_EXPORT_DEF( void ) FT_Trace_Set_Default_Level( void ) { … } FT_EXPORT_DEF( void ) FT_Set_Log_Handler( FT_Custom_Log_Handler handler ) { … } FT_EXPORT_DEF( void ) FT_Set_Default_Log_Handler( void ) { … } #endif /* !FT_DEBUG_LOGGING */ /* END */
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