267 lines
7.7 KiB
C
267 lines
7.7 KiB
C
/***************************************************************************/
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/* */
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/* ftdebug.c */
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/* */
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/* Debugging and logging component (body). */
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/* */
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/* Copyright 1996-2017 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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/*************************************************************************/
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/* */
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/* This component contains various macros and functions used to ease the */
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/* debugging of the FreeType engine. Its main purpose is in assertion */
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/* checking, tracing, and error detection. */
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/* */
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/* There are now three debugging modes: */
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/* */
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/* - trace mode */
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/* */
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/* Error and trace messages are sent to the log file (which can be the */
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/* standard error output). */
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/* */
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/* - error mode */
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/* */
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/* Only error messages are generated. */
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/* */
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/* - release mode: */
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/* */
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/* No error message is sent or generated. The code is free from any */
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/* debugging parts. */
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/* */
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/*************************************************************************/
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include FT_INTERNAL_DEBUG_H
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#ifdef FT_DEBUG_LEVEL_ERROR
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/* documentation is in ftdebug.h */
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FT_BASE_DEF( void )
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FT_Message( const char* fmt,
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... )
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{
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va_list ap;
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va_start( ap, fmt );
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vfprintf( stderr, fmt, ap );
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va_end( ap );
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}
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/* documentation is in ftdebug.h */
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FT_BASE_DEF( void )
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FT_Panic( const char* fmt,
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... )
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{
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va_list ap;
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va_start( ap, fmt );
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vfprintf( stderr, fmt, ap );
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va_end( ap );
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exit( EXIT_FAILURE );
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}
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/* documentation is in ftdebug.h */
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FT_BASE_DEF( int )
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FT_Throw( FT_Error error,
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int line,
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const char* file )
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{
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FT_UNUSED( error );
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FT_UNUSED( line );
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FT_UNUSED( file );
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return 0;
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}
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#endif /* FT_DEBUG_LEVEL_ERROR */
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#ifdef FT_DEBUG_LEVEL_TRACE
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/* array of trace levels, initialized to 0 */
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int ft_trace_levels[trace_count];
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/* define array of trace toggle names */
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#define FT_TRACE_DEF( x ) #x ,
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static const char* ft_trace_toggles[trace_count + 1] =
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{
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#include FT_INTERNAL_TRACE_H
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NULL
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};
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#undef FT_TRACE_DEF
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/* documentation is in ftdebug.h */
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FT_BASE_DEF( FT_Int )
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FT_Trace_Get_Count( void )
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{
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return trace_count;
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}
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/* documentation is in ftdebug.h */
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FT_BASE_DEF( const char * )
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FT_Trace_Get_Name( FT_Int idx )
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{
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int max = FT_Trace_Get_Count();
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if ( idx < max )
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return ft_trace_toggles[idx];
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else
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return NULL;
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}
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/*************************************************************************/
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/* */
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/* Initialize the tracing sub-system. This is done by retrieving the */
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/* value of the `FT2_DEBUG' environment variable. It must be a list of */
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/* toggles, separated by spaces, `;', or `,'. Example: */
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/* */
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/* export FT2_DEBUG="any:3 memory:7 stream:5" */
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/* */
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/* This requests that all levels be set to 3, except the trace level for */
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/* the memory and stream components which are set to 7 and 5, */
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/* respectively. */
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/* */
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/* See the file `include/freetype/internal/fttrace.h' for details of */
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/* the available toggle names. */
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/* */
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/* The level must be between 0 and 7; 0 means quiet (except for serious */
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/* runtime errors), and 7 means _very_ verbose. */
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/* */
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FT_BASE_DEF( void )
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ft_debug_init( void )
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{
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const char* ft2_debug = getenv( "FT2_DEBUG" );
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if ( ft2_debug )
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{
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const char* p = ft2_debug;
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const char* q;
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for ( ; *p; p++ )
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{
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/* skip leading whitespace and separators */
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if ( *p == ' ' || *p == '\t' || *p == ',' || *p == ';' || *p == '=' )
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continue;
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/* read toggle name, followed by ':' */
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q = p;
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while ( *p && *p != ':' )
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p++;
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if ( !*p )
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break;
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if ( *p == ':' && p > q )
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{
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FT_Int n, i, len = (FT_Int)( p - q );
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FT_Int level = -1, found = -1;
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for ( n = 0; n < trace_count; n++ )
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{
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const char* toggle = ft_trace_toggles[n];
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for ( i = 0; i < len; i++ )
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{
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if ( toggle[i] != q[i] )
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break;
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}
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if ( i == len && toggle[i] == 0 )
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{
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found = n;
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break;
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}
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}
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/* read level */
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p++;
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if ( *p )
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{
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level = *p - '0';
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if ( level < 0 || level > 7 )
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level = -1;
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}
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if ( found >= 0 && level >= 0 )
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{
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if ( found == trace_any )
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{
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/* special case for `any' */
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for ( n = 0; n < trace_count; n++ )
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ft_trace_levels[n] = level;
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}
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else
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ft_trace_levels[found] = level;
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}
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}
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}
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}
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}
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#else /* !FT_DEBUG_LEVEL_TRACE */
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FT_BASE_DEF( void )
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ft_debug_init( void )
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{
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/* nothing */
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}
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FT_BASE_DEF( FT_Int )
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FT_Trace_Get_Count( void )
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{
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return 0;
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}
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FT_BASE_DEF( const char * )
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FT_Trace_Get_Name( FT_Int idx )
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{
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FT_UNUSED( idx );
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return NULL;
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}
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#endif /* !FT_DEBUG_LEVEL_TRACE */
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/* END */
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