gistfile1.ec

public char * PassArg(char * output, const char * input)
{
#ifdef __WIN32__
//define windowsFileNameCharsNeedEscaping = " !%&'()+,;=[]^`{}~"; // "#$-.@_" are ok
   const char * escChars = " !%&'()+,;=[]^`{}~\""; // windowsFileNameCharsNeedEscaping;
   const char * escCharsQuoted = "\"";
#else
//define linuxFileNameCharsNeedEscaping = " !\"$&'()*:;<=>?[\\`{|"; // "#%+,-.@]^_}~" are ok
   const char * escChars = " -!\"$&'()*:;<=>?[\\`{|"; // linuxFileNameCharsNeedEscaping;
   const char * escCharsQuoted = "\"()$";
#endif
   char *o = output, *i = input;
   bool quoting = false;
   char *l = input;
#ifdef __WIN32__
   while(*l && !strchr(escChars, *l)) l++;
   if(*l) quoting = true;
#else
   if(*i == '-')
   {
      l++;
      while(*l && !strchr(escChars, *l)) l++;
      if(*l) quoting = true;
   }
#endif
   if(quoting)
      *o++ = '\"';
   while(*i)
   {
      if(strchr(quoting ? escCharsQuoted : escChars, *i))
         *o++ = '\\';
      *o++ = *i++;
   }
   if(quoting)
      *o++ = '\"';
   *o = '\0';
   return o;
}