RISCOS/unixstuff.c

   1 /* Fudge unix isatty and fileno for RISCOS */
   2
   3 #include "unixstuff.h"
   4 #include <math.h>
   5 #include <time.h>
   6 #include "oslib/osfile.h"
   7
   8 int fileno(FILE *f)
   9 { return (int)f;
  10 }
  11
  12 int isatty(int fn)
  13 { return (fn==fileno(stdin));
  14 }
  15
  16 bits unixtime(bits ld,bits ex)
  17 { ld&=0xFF;
  18   ld-=51;
  19   if(ex<1855547904U) ld--;
  20   ex-=1855548004U;
  21   return ex/100+42949673U*ld-ld/25;
  22 }
  23
  24
  25 /* from RISC OS infozip, preserves filetype in ld */
  26 int acorntime(bits *ex, bits *ld, time_t utime)
  27 {
  28    unsigned timlo;      /* 3 lower bytes of acorn file-time plus carry byte */
  29    unsigned timhi;      /* 2 high bytes of acorn file-time */
  30
  31    timlo = ((unsigned)utime & 0x00ffffffU) * 100 + 0x00996a00U;
  32    timhi = ((unsigned)utime >> 24);
  33    timhi = timhi * 100 + 0x0000336eU + (timlo >> 24);
  34    if (timhi & 0xffff0000U)
  35        return 1;        /* calculation overflow, do not change time */
  36
  37    /* insert the five time bytes into loadaddr and execaddr variables */
  38    *ex = (timlo & 0x00ffffffU) | ((timhi & 0x000000ffU) << 24);
  39    *ld = (*ld & 0xffffff00U)   | ((timhi >> 8) & 0x000000ffU);
  40
  41    return 0;            /* subject to future extension to signal overflow */
  42 }
  43
  44
  45 int isdir(char *fn)
  46 { int ob;
  47   if(xosfile_read_stamped_no_path(fn,&ob,0,0,0,0,0)) return 0;
  48   switch (ob)
  49   {   case osfile_IS_DIR:return 1;
  50     case osfile_IS_IMAGE:return 1;
  51   }
  52   return 0;
  53 }
  54
  55 int isfile(char *fn)
  56 { int ob;
  57   if(xosfile_read_stamped_no_path(fn,&ob,0,0,0,0,0)) return 0;
  58   switch (ob)
  59   {  case osfile_IS_FILE:return 1;
  60     case osfile_IS_IMAGE:return 1;
  61   }
  62   return 0;
  63 }
  64
  65 int object_exists(char *fn)
  66 { int ob;
  67   if(xosfile_read_stamped_no_path(fn,&ob,0,0,0,0,0)) return 0;
  68   switch (ob)
  69   {  case osfile_IS_FILE:return 1;
  70       case osfile_IS_DIR:return 1;
  71     case osfile_IS_IMAGE:return 1;
  72   }
  73   return 0;
  74 }