thirdparty/freetype-2.3.12/src/base/ftdebug.c

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  ftdebug.c                                                              */
   4 /*                                                                         */
   5 /*    Debugging and logging component (body).                              */
   6 /*                                                                         */
   7 /*  Copyright 1996-2001, 2002, 2004, 2008 by                               */
   8 /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
   9 /*                                                                         */
  10 /*  This file is part of the FreeType project, and may only be used,       */
  11 /*  modified, and distributed under the terms of the FreeType project      */
  12 /*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
  13 /*  this file you indicate that you have read the license and              */
  14 /*  understand and accept it fully.                                        */
  15 /*                                                                         */
  16 /***************************************************************************/
  17
  18
  19   /*************************************************************************/
  20   /*                                                                       */
  21   /* This component contains various macros and functions used to ease the */
  22   /* debugging of the FreeType engine.  Its main purpose is in assertion   */
  23   /* checking, tracing, and error detection.                               */
  24   /*                                                                       */
  25   /* There are now three debugging modes:                                  */
  26   /*                                                                       */
  27   /* - trace mode                                                          */
  28   /*                                                                       */
  29   /*   Error and trace messages are sent to the log file (which can be the */
  30   /*   standard error output).                                             */
  31   /*                                                                       */
  32   /* - error mode                                                          */
  33   /*                                                                       */
  34   /*   Only error messages are generated.                                  */
  35   /*                                                                       */
  36   /* - release mode:                                                       */
  37   /*                                                                       */
  38   /*   No error message is sent or generated.  The code is free from any   */
  39   /*   debugging parts.                                                    */
  40   /*                                                                       */
  41   /*************************************************************************/
  42
  43
  44 #include <ft2build.h>
  45 #include FT_FREETYPE_H
  46 #include FT_INTERNAL_DEBUG_H
  47
  48
  49 #ifdef FT_DEBUG_LEVEL_ERROR
  50
  51   /* documentation is in ftdebug.h */
  52
  53   FT_BASE_DEF( void )
  54   FT_Message( const char*  fmt, ... )
  55   {
  56     va_list  ap;
  57
  58
  59     va_start( ap, fmt );
  60     vfprintf( stderr, fmt, ap );
  61     va_end( ap );
  62   }
  63
  64
  65   /* documentation is in ftdebug.h */
  66
  67   FT_BASE_DEF( void )
  68   FT_Panic( const char*  fmt, ... )
  69   {
  70     va_list  ap;
  71
  72
  73     va_start( ap, fmt );
  74     vfprintf( stderr, fmt, ap );
  75     va_end( ap );
  76
  77     exit( EXIT_FAILURE );
  78   }
  79
  80 #endif /* FT_DEBUG_LEVEL_ERROR */
  81
  82
  83
  84 #ifdef FT_DEBUG_LEVEL_TRACE
  85
  86   /* array of trace levels, initialized to 0 */
  87   int  ft_trace_levels[trace_count];
  88
  89
  90   /* define array of trace toggle names */
  91 #define FT_TRACE_DEF( x )  #x ,
  92
  93   static const char*  ft_trace_toggles[trace_count + 1] =
  94   {
  95 #include FT_INTERNAL_TRACE_H
  96     NULL
  97   };
  98
  99 #undef FT_TRACE_DEF
 100
 101
 102   /* documentation is in ftdebug.h */
 103
 104   FT_BASE_DEF( FT_Int )
 105   FT_Trace_Get_Count( void )
 106   {
 107     return trace_count;
 108   }
 109
 110
 111   /* documentation is in ftdebug.h */
 112
 113   FT_BASE_DEF( const char * )
 114   FT_Trace_Get_Name( FT_Int  idx )
 115   {
 116     int  max = FT_Trace_Get_Count();
 117
 118
 119     if ( idx < max )
 120       return ft_trace_toggles[idx];
 121     else
 122       return NULL;
 123   }
 124
 125
 126   /*************************************************************************/
 127   /*                                                                       */
 128   /* Initialize the tracing sub-system.  This is done by retrieving the    */
 129   /* value of the `FT2_DEBUG' environment variable.  It must be a list of  */
 130   /* toggles, separated by spaces, `;', or `,'.  Example:                  */
 131   /*                                                                       */
 132   /*    export FT2_DEBUG="any:3 memory:7 stream:5"                         */
 133   /*                                                                       */
 134   /* This requests that all levels be set to 3, except the trace level for */
 135   /* the memory and stream components which are set to 7 and 5,            */
 136   /* respectively.                                                         */
 137   /*                                                                       */
 138   /* See the file <include/freetype/internal/fttrace.h> for details of the */
 139   /* available toggle names.                                               */
 140   /*                                                                       */
 141   /* The level must be between 0 and 7; 0 means quiet (except for serious  */
 142   /* runtime errors), and 7 means _very_ verbose.                          */
 143   /*                                                                       */
 144   FT_BASE_DEF( void )
 145   ft_debug_init( void )
 146   {
 147     const char*  ft2_debug = getenv( "FT2_DEBUG" );
 148
 149
 150     if ( ft2_debug )
 151     {
 152       const char*  p = ft2_debug;
 153       const char*  q;
 154
 155
 156       for ( ; *p; p++ )
 157       {
 158         /* skip leading whitespace and separators */
 159         if ( *p == ' ' || *p == '\t' || *p == ',' || *p == ';' || *p == '=' )
 160           continue;
 161
 162         /* read toggle name, followed by ':' */
 163         q = p;
 164         while ( *p && *p != ':' )
 165           p++;
 166
 167         if ( *p == ':' && p > q )
 168         {
 169           FT_Int  n, i, len = (FT_Int)( p - q );
 170           FT_Int  level = -1, found = -1;
 171
 172
 173           for ( n = 0; n < trace_count; n++ )
 174           {
 175             const char*  toggle = ft_trace_toggles[n];
 176
 177
 178             for ( i = 0; i < len; i++ )
 179             {
 180               if ( toggle[i] != q[i] )
 181                 break;
 182             }
 183
 184             if ( i == len && toggle[i] == 0 )
 185             {
 186               found = n;
 187               break;
 188             }
 189           }
 190
 191           /* read level */
 192           p++;
 193           if ( *p )
 194           {
 195             level = *p++ - '0';
 196             if ( level < 0 || level > 7 )
 197               level = -1;
 198           }
 199
 200           if ( found >= 0 && level >= 0 )
 201           {
 202             if ( found == trace_any )
 203             {
 204               /* special case for `any' */
 205               for ( n = 0; n < trace_count; n++ )
 206                 ft_trace_levels[n] = level;
 207             }
 208             else
 209               ft_trace_levels[found] = level;
 210           }
 211         }
 212       }
 213     }
 214   }
 215
 216
 217 #else  /* !FT_DEBUG_LEVEL_TRACE */
 218
 219
 220   FT_BASE_DEF( void )
 221   ft_debug_init( void )
 222   {
 223     /* nothing */
 224   }
 225
 226
 227   FT_BASE_DEF( FT_Int )
 228   FT_Trace_Get_Count( void )
 229   {
 230     return 0;
 231   }
 232
 233
 234   FT_BASE_DEF( const char * )
 235   FT_Trace_Get_Name( FT_Int  idx )
 236   {
 237     FT_UNUSED( idx );
 238
 239     return NULL;
 240   }
 241
 242
 243 #endif /* !FT_DEBUG_LEVEL_TRACE */
 244
 245
 246 /* END */