apdf/freetype2/base/ftdebug.c

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  ftdebug.c                                                              */
   4 /*                                                                         */
   5 /*    Debugging and logging component (body).                              */
   6 /*                                                                         */
   7 /*  Copyright 1996-2001 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 #if defined( FT_DEBUG_LEVEL_ERROR )
  50
  51   FT_EXPORT_DEF( void )
  52   FT_Message( const char*  fmt, ... )
  53   {
  54     va_list  ap;
  55
  56
  57     va_start( ap, fmt );
  58     vprintf( fmt, ap );
  59     va_end( ap );
  60   }
  61
  62
  63   FT_EXPORT_DEF( void )
  64   FT_Panic( const char*  fmt, ... )
  65   {
  66     va_list  ap;
  67
  68
  69     va_start( ap, fmt );
  70     vprintf( fmt, ap );
  71     va_end( ap );
  72
  73     exit( EXIT_FAILURE );
  74   }
  75
  76 #endif /* FT_DEBUG_LEVEL_ERROR */
  77
  78
  79
  80 #ifdef FT_DEBUG_LEVEL_TRACE
  81
  82   /* array of trace levels, initialized to 0 */
  83   int  ft_trace_levels[trace_count];
  84
  85   /* define array of trace toggle names */
  86 #define FT_TRACE_DEF(x)  #x ,
  87
  88   static const char*  ft_trace_toggles[trace_count + 1] =
  89   {
  90 #include FT_INTERNAL_TRACE_H
  91     NULL
  92   };
  93
  94 #undef FT_TRACE_DEF
  95
  96
  97   /*************************************************************************/
  98   /*                                                                       */
  99   /* Initialize the tracing sub-system.  This is done by retrieving the    */
 100   /* value of the "FT2_DEBUG" environment variable.  It must be a list of  */
 101   /* toggles, separated by spaces, `;' or `:'.  Example:                   */
 102   /*                                                                       */
 103   /*    "any=3 memory=6 stream=5"                                          */
 104   /*                                                                       */
 105   /* This will request that all levels be set to 3, except the trace level */
 106   /* for the memory and stream components which are set to 6 and 5,        */
 107   /* respectively.                                                         */
 108   /*                                                                       */
 109   /* See the file <freetype/internal/fttrace.h> for details of the         */
 110   /* available toggle names.                                               */
 111   /*                                                                       */
 112   /* The level must be between 0 and 6; 0 means quiet (except for serious  */
 113   /* runtime errors), and 6 means _very_ verbose.                          */
 114   /*                                                                       */
 115   FT_BASE_DEF( void )
 116   ft_debug_init( void )
 117   {
 118     const char*  ft2_debug = getenv( "FT2_DEBUG" );
 119
 120     if ( ft2_debug )
 121     {
 122       const char*  p = ft2_debug;
 123       const char*  q;
 124
 125
 126       for ( ; *p; p++ )
 127       {
 128         /* skip leading whitespace and separators */
 129         if ( *p == ' ' || *p == '\t' || *p == ':' || *p == ';' || *p == '=' )
 130           continue;
 131
 132         /* read toggle name, followed by '=' */
 133         q = p;
 134         while ( *p && *p != '=' )
 135           p++;
 136
 137         if ( *p == '=' && p > q )
 138         {
 139           int  n, i, len = p - q;
 140           int  level = -1, found = -1;
 141
 142
 143           for ( n = 0; n < trace_count; n++ )
 144           {
 145             const char*  toggle = ft_trace_toggles[n];
 146
 147
 148             for ( i = 0; i < len; i++ )
 149             {
 150               if ( toggle[i] != q[i] )
 151                 break;
 152             }
 153
 154             if ( i == len && toggle[i] == 0 )
 155             {
 156               found = n;
 157               break;
 158             }
 159           }
 160
 161           /* read level */
 162           p++;
 163           if ( *p )
 164           {
 165             level = *p++ - '0';
 166             if ( level < 0 || level > 6 )
 167               level = -1;
 168           }
 169
 170           if ( found >= 0 && level >= 0 )
 171           {
 172             if ( found == trace_any )
 173             {
 174               /* special case for "any" */
 175               for ( n = 0; n < trace_count; n++ )
 176                 ft_trace_levels[n] = level;
 177             }
 178             else
 179               ft_trace_levels[found] = level;
 180           }
 181         }
 182       }
 183     }
 184   }
 185
 186 #else  /* !FT_DEBUG_LEVEL_TRACE */
 187
 188   FT_BASE_DEF( void )
 189   ft_debug_init( void )
 190   {
 191     /* nothing */
 192   }
 193
 194 #endif /* !FT_DEBUG_LEVEL_TRACE */
 195
 196
 197 /* END */