freetype/src/base/ftdebug.c

/***************************************************************************/
/*                                                                         */
/*  ftdebug.c                                                              */
/*                                                                         */
/*    Debugging and logging component (body).                              */
/*                                                                         */
/*  Copyright 1996-2001 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 <ft2build.h>
#include FT_INTERNAL_DEBUG_H


#if defined( FT_DEBUG_LEVEL_ERROR )


#include <stdarg.h>
#include <stdlib.h>
#include <string.h>


  FT_EXPORT_DEF( void )
  FT_Message( const char*  fmt, ... )
  {
    va_list  ap;


    va_start( ap, fmt );
    vprintf( fmt, ap );
    va_end( ap );
  }


  FT_EXPORT_DEF( void )
  FT_Panic( const char*  fmt, ... )
  {
    va_list  ap;


    va_start( ap, fmt );
    vprintf( fmt, ap );
    va_end( ap );

    exit( EXIT_FAILURE );
  }

#endif /* FT_DEBUG_LEVEL_ERROR */



#ifdef FT_DEBUG_LEVEL_TRACE

  /* array of trace levels, initialized to 0 */
  int  ft_trace_levels[ trace_count ];

 /* define array of trace toggle names */
#define  FT_TRACE_DEF(x)   #x ,

  static const char*  ft_trace_toggles[ trace_count+1 ] =
  { 
#include FT_INTERNAL_TRACE_H
    NULL
  };

#undef FT_TRACE_DEF



 /************************************************************************
  *
  *  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 ':' for example:
  *
  *    "any=3 memory=6 stream=5"
  *
  *  will request that all levels be set to 3, except the trace level for
  *  the memory and stream components which are respectively set to 6 and 5
  *
  *  see the file <freetype/internal/fttrace.h> for details of the available
  *  toggle names.
  *
  *  the level is between 0 and 6, where 0 is quiet (except in important
  *  runtime errors), and 6 is _very_ verbose
  */

  FT_BASE_DEF( void )
  ft_debug_init( void )
  {
    const char*  ft2_debug = getenv( "FT2_DEBUG" );
    
    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;
          
        /* read toggle name, followed by '=' */
        q = p;
        while ( *p && *p != '=' )
          p++;
          
        if ( *p == '=' && p > q )
        {
          int  n, i, len = p - q;
          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 > 6 )
              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[n] = level;
            }
            else
              ft_trace_levels[ found ] = level;
          }
        }
      }
    }
  }

#else  /* !FT_DEBUG_LEVEL_TRACE */

  FT_BASE_DEF( void )
  ft_debut_init( void )
  {
    /* nothing */
  }

#endif /* !FT_DEBUG_LEVEL_TRACE */


/* END */