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   1  /*
   2   * Implementation of things missing in Windows
   3   */
   4  
   5  #ifndef M_PI
   6  #define M_PI  3.14159265358979323846
   7  #endif
   8  
   9  #undef ntohs
  10  #undef ntohl
  11  #undef htonl
  12  
  13  #ifdef WINDOWS_FUNCTIONS
  14  /* byte order */
  15  
  16  static unsigned short StoM(unsigned short inv) {
  17      union iconv {
  18          unsigned short    ui;
  19          unsigned char   uc[2];
  20      } *inp, outv;
  21  
  22      inp = (union iconv *)&inv;
  23  
  24      outv.uc[0] = inp->uc[1];
  25      outv.uc[1] = inp->uc[0];
  26   
  27      return (outv.ui);
  28  }
  29  
  30  static unsigned int ItoM(unsigned int inv) {
  31      union iconv {
  32          unsigned int    ui;
  33          unsigned char   uc[4];
  34      } *inp, outv;
  35  
  36      inp = (union iconv *)&inv;
  37  
  38      outv.uc[0] = inp->uc[3];
  39      outv.uc[1] = inp->uc[2];
  40      outv.uc[2] = inp->uc[1];
  41      outv.uc[3] = inp->uc[0];
  42  
  43      return (outv.ui);
  44  }
  45  
  46  unsigned short ntohs(unsigned short inv) { return StoM(inv); }
  47  unsigned long ntohl(unsigned long inv) { return ItoM(inv); }
  48  unsigned long htonl(unsigned long inv) { return ItoM(inv); }
  49  
  50  char *optarg;
  51  int optind=1;
  52  
  53  char getopt(int argc, char **argv, char *args) {
  54      int n,nlen=strlen(args),nLen=0;
  55      char nCmd;
  56      
  57      if (argv[optind] && *argv[optind]=='-') {
  58          nCmd=*((argv[optind]+1));
  59  
  60          for (n=0;n<nlen;n++) {
  61              if (args[n] == ':') continue;
  62              if (args[n] == nCmd) {
  63                  if (args[n+1]==':') {
  64                      char retVal;
  65                      retVal=*(argv[optind]+1);
  66                      optarg=argv[optind+1];
  67                      if (!optarg) optarg="";
  68                      optind+=2;
  69                      return retVal;
  70                  } else {
  71                      char retVal;
  72                      retVal=*(argv[optind]+1);
  73                      optarg=NULL;
  74                      optind+=1;
  75                      return retVal;
  76                  }
  77              }
  78          }    
  79      }
  80      return -1;
  81  }
  82  
  83  #else
  84  
  85  unsigned short ntohs(unsigned short inv);
  86  unsigned long ntohl(unsigned long inv);
  87  unsigned long htonl(unsigned long inv);
  88  
  89  extern char *optarg;
  90  extern int optind;
  91  
  92  char getopt(int argc, char **argv, char *args);
  93  #endif