source: vendor/python/2.5/RISCOS/unixstuff.c

/* Fudge unix isatty and fileno for RISCOS */

#include "unixstuff.h"
#include <math.h>
#include <time.h>
#include "oslib/osfile.h"

int fileno(FILE *f)
{ return (int)f;
}

int isatty(int fn)
{ return (fn==fileno(stdin));
}

bits unixtime(bits ld,bits ex)
{ ld&=0xFF;
  ld-=51;
  if(ex<1855547904U) ld--;
  ex-=1855548004U;
  return ex/100+42949673U*ld-ld/25;
}


/* from RISC OS infozip, preserves filetype in ld */
int acorntime(bits *ex, bits *ld, time_t utime)
{
   unsigned timlo;      /* 3 lower bytes of acorn file-time plus carry byte */
   unsigned timhi;      /* 2 high bytes of acorn file-time */

   timlo = ((unsigned)utime & 0x00ffffffU) * 100 + 0x00996a00U;
   timhi = ((unsigned)utime >> 24);
   timhi = timhi * 100 + 0x0000336eU + (timlo >> 24);
   if (timhi & 0xffff0000U)
       return 1;        /* calculation overflow, do not change time */

   /* insert the five time bytes into loadaddr and execaddr variables */
   *ex = (timlo & 0x00ffffffU) | ((timhi & 0x000000ffU) << 24);
   *ld = (*ld & 0xffffff00U)   | ((timhi >> 8) & 0x000000ffU);

   return 0;            /* subject to future extension to signal overflow */
}


int isdir(char *fn)
{ int ob;
  if(xosfile_read_stamped_no_path(fn,&ob,0,0,0,0,0)) return 0;
  switch (ob)
  {   case osfile_IS_DIR:return 1;
    case osfile_IS_IMAGE:return 1;
  }
  return 0;
}

int isfile(char *fn)
{ int ob;
  if(xosfile_read_stamped_no_path(fn,&ob,0,0,0,0,0)) return 0;
  switch (ob)
  {  case osfile_IS_FILE:return 1;
    case osfile_IS_IMAGE:return 1;
  }
  return 0;
}

int object_exists(char *fn)
{ int ob;
  if(xosfile_read_stamped_no_path(fn,&ob,0,0,0,0,0)) return 0;
  switch (ob)
  {  case osfile_IS_FILE:return 1;
      case osfile_IS_DIR:return 1;
    case osfile_IS_IMAGE:return 1;
  }
  return 0;
}