compatibility.cpp

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/************************************************************************
 ************************************************************************
    FAUST compiler
    Copyright (C) 2003-2004 GRAME, Centre National de Creation Musicale
    ---------------------------------------------------------------------
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 ************************************************************************
 ************************************************************************/
 
#include "compatibility.hh"
#include "math.h"

#if defined(__MINGW32__) || defined (WIN32)
    // Simulate some Unix fonctions on Windows

    #ifndef __MINGW32__
    /* missing on Windows : see http://bugs.mysql.com/bug.php?id=15936 */
    double rint(double nr)
    {
        double f = floor(nr);
        double c = ceil(nr);
        return (((c -nr) >= (nr - f)) ? f : c);
    }
    #endif

    #if defined(_MSC_VER) || defined(_MSC_EXTENSIONS)
      #define DELTA_EPOCH_IN_MICROSECS  11644473600000000Ui64
    #else
      #define DELTA_EPOCH_IN_MICROSECS  11644473600000000ULL
    #endif

    int gettimeofday(struct timeval *tv, struct timezone *tz)
    {
      FILETIME ft;
      unsigned __int64 tmpres = 0;
      static int tzflag;

      if (NULL != tv)
      {
        GetSystemTimeAsFileTime(&ft);

        tmpres |= ft.dwHighDateTime;
        tmpres <<= 32;
        tmpres |= ft.dwLowDateTime;

        /*converting file time to unix epoch*/
        tmpres -= DELTA_EPOCH_IN_MICROSECS; 
        tmpres /= 10;  /*convert into microseconds*/
        tv->tv_sec = (long)(tmpres / 1000000UL);
        tv->tv_usec = (long)(tmpres % 1000000UL);
      }

      if (NULL != tz)
      {
        if (!tzflag)
        {
          _tzset();
          tzflag++;
        }
        tz->tz_minuteswest = _timezone / 60;
        tz->tz_dsttime = _daylight;
      }
      return 0;
    }

#if defined(_MBCS) || __MINGW32__
    bool chdir(const char* path)
    {
        return !SetCurrentDirectory(path);
    }

    int mkdir(const char* path, unsigned int attribute)
    {
        return CreateDirectory(path,NULL);
    }

    char* getcwd(char* str, unsigned int size)
    {
        GetCurrentDirectory(size, str);
        return str;
    }
    void getFaustPathname(char* str, unsigned int size)
    {
        GetModuleFileName(NULL, str, size);
    }
#else
    bool chdir(const char* path)
    {
        wchar_t wstr[2048];
        mbstowcs(wstr,path,2048);
        return !SetCurrentDirectory(wstr);
    }

    int mkdir(const char* path, unsigned int attribute)
    {
        wchar_t wstr[2048];
        mbstowcs(wstr,path,2048);
        return CreateDirectory(wstr,NULL);
    }

    char* getcwd(char* str, unsigned int size)
    {
        wchar_t wstr[2048];
        GetCurrentDirectory(2048, wstr);
        wcstombs(str,wstr,size);
        return str;
    }

    void getFaustPathname(char* str, unsigned int size)
    {
        wchar_t wstr[2048];
        GetModuleFileName(NULL, wstr, 2048);
        wcstombs(str,wstr,size);
    }

#endif

#if !defined(__MINGW32__)

    typedef union
    {
        double value;
        struct
        {
            unsigned int lsw;
            unsigned int msw;
        } parts;
    } ieee_double_shape_type;


#define EXTRACT_WORDS(ix0,ix1,d)                \
    do {                                \
    ieee_double_shape_type ew_u;                    \
    ew_u.value = (d);                       \
    (ix0) = ew_u.parts.msw;                 \
    (ix1) = ew_u.parts.lsw;                 \
    } while (0)

    /* Get the more significant 32 bit int from a double.  */

#define GET_HIGH_WORD(i,d)                  \
    do {                                \
    ieee_double_shape_type gh_u;                    \
    gh_u.value = (d);                       \
    (i) = gh_u.parts.msw;                       \
    } while (0)

    /* Get the less significant 32 bit int from a double.  */

#define GET_LOW_WORD(i,d)                   \
    do {                                \
    ieee_double_shape_type gl_u;                    \
    gl_u.value = (d);                       \
    (i) = gl_u.parts.lsw;                       \
    } while (0)

#define SET_HIGH_WORD(d,v)                  \
    do {                                \
    ieee_double_shape_type sh_u;                    \
    sh_u.value = (d);                       \
    sh_u.parts.msw = (v);                       \
    (d) = sh_u.value;                       \
    } while (0)

    double remainder(double x, double p)
    {
        int hx,hp;
        unsigned int sx,lx,lp;
        double p_half;

        EXTRACT_WORDS(hx,lx,x);
        EXTRACT_WORDS(hp,lp,p);
        sx = hx&0x80000000;
        hp &= 0x7fffffff;
        hx &= 0x7fffffff;

        /* purge off exception values */
        if((hp|lp)==0) return (x*p)/(x*p);  /* p = 0 */
        if((hx>=0x7ff00000)||           /* x not finite */
            ((hp>=0x7ff00000)&&         /* p is NaN */
            (((hp-0x7ff00000)|lp)!=0)))
            return (x*p)/(x*p);


        static const double zero = 0.0;
        if (hp<=0x7fdfffff) x = fmod(x,p+p);    /* now x < 2p */
        if (((hx-hp)|(lx-lp))==0) return zero*x;
        x  = fabs(x);
        p  = fabs(p);
        if (hp<0x00200000) {
            if(x+x>p) {
                x-=p;
                if(x+x>=p) x -= p;
            }
        } else {
            p_half = 0.5*p;
            if(x>p_half) {
                x-=p;
                if(x>=p_half) x -= p;
            }
        }
        GET_HIGH_WORD(hx,x);
        SET_HIGH_WORD(x,hx^sx);
        return x;
    }
#endif

#else // Linux

    #include <stdlib.h>
    #include <string.h>
    void getFaustPathname(char* str, unsigned int size)
    {
        char* path = getenv("_");
        if (path) {
            strncpy(str, path, size);
        } else {
            // prevent the case of _ undefined
            strncpy(str, "/usr/local/bin/faust", size);
        } 
    }

#endif