gcc/f/runtime/libI77/due.c

   1 #include "f2c.h"
   2 #include "fio.h"
   3
   4 #ifdef KR_headers
   5 c_due(a) cilist *a;
   6 #else
   7 c_due(cilist *a)
   8 #endif
   9 {
  10         if(f__init != 1) f_init();
  11         f__init = 3;
  12         if(a->ciunit>=MXUNIT || a->ciunit<0)
  13                 err(a->cierr,101,"startio");
  14         f__sequential=f__formatted=f__recpos=0;
  15         f__external=1;
  16         f__curunit = &f__units[a->ciunit];
  17         f__elist=a;
  18         if(f__curunit->ufd==NULL && fk_open(DIR,UNF,a->ciunit) ) err(a->cierr,104,"due");
  19         f__cf=f__curunit->ufd;
  20         if(f__curunit->ufmt) err(a->cierr,102,"cdue");
  21         if(!f__curunit->useek) err(a->cierr,104,"cdue");
  22         if(f__curunit->ufd==NULL) err(a->cierr,114,"cdue");
  23         if(a->cirec <= 0)
  24                 err(a->cierr,130,"due");
  25         (void) fseek(f__cf,(long)(a->cirec-1)*f__curunit->url,SEEK_SET);
  26         f__curunit->uend = 0;
  27         return(0);
  28 }
  29 #ifdef KR_headers
  30 integer s_rdue(a) cilist *a;
  31 #else
  32 integer s_rdue(cilist *a)
  33 #endif
  34 {
  35         int n;
  36         f__reading=1;
  37         if(n=c_due(a)) return(n);
  38         if(f__curunit->uwrt && f__nowreading(f__curunit))
  39                 err(a->cierr,errno,"read start");
  40         return(0);
  41 }
  42 #ifdef KR_headers
  43 integer s_wdue(a) cilist *a;
  44 #else
  45 integer s_wdue(cilist *a)
  46 #endif
  47 {
  48         int n;
  49         f__reading=0;
  50         if(n=c_due(a)) return(n);
  51         if(f__curunit->uwrt != 1 && f__nowwriting(f__curunit))
  52                 err(a->cierr,errno,"write start");
  53         return(0);
  54 }
  55 integer e_rdue(Void)
  56 {
  57         f__init = 1;
  58         if(f__curunit->url==1 || f__recpos==f__curunit->url)
  59                 return(0);
  60         (void) fseek(f__cf,(long)(f__curunit->url-f__recpos),SEEK_CUR);
  61         if(ftell(f__cf)%f__curunit->url)
  62                 err(f__elist->cierr,200,"syserr");
  63         return(0);
  64 }
  65 integer e_wdue(Void)
  66 {
  67         f__init = 1;
  68 #ifdef ALWAYS_FLUSH
  69         if (fflush(f__cf))
  70                 err(f__elist->cierr,errno,"write end");
  71 #endif
  72         return(e_rdue());
  73 }