contrib/libf2c/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         if(a->ciunit>=MXUNIT || a->ciunit<0)
  18                 err(a->cierr,101,"startio");
  19         f__elist=a;
  20         if(f__curunit->ufd==NULL && fk_open(DIR,UNF,a->ciunit) ) err(a->cierr,104,"due");
  21         f__cf=f__curunit->ufd;
  22         if(f__curunit->ufmt) err(a->cierr,102,"cdue");
  23         if(!f__curunit->useek) err(a->cierr,104,"cdue");
  24         if(f__curunit->ufd==NULL) err(a->cierr,114,"cdue");
  25         if(a->cirec <= 0)
  26                 err(a->cierr,130,"due");
  27         fseek(f__cf,(long)(a->cirec-1)*f__curunit->url,SEEK_SET);
  28         f__curunit->uend = 0;
  29         return(0);
  30 }
  31 #ifdef KR_headers
  32 integer s_rdue(a) cilist *a;
  33 #else
  34 integer s_rdue(cilist *a)
  35 #endif
  36 {
  37         int n;
  38         f__reading=1;
  39         if(n=c_due(a)) return(n);
  40         if(f__curunit->uwrt && f__nowreading(f__curunit))
  41                 err(a->cierr,errno,"read start");
  42         return(0);
  43 }
  44 #ifdef KR_headers
  45 integer s_wdue(a) cilist *a;
  46 #else
  47 integer s_wdue(cilist *a)
  48 #endif
  49 {
  50         int n;
  51         f__reading=0;
  52         if(n=c_due(a)) return(n);
  53         if(f__curunit->uwrt != 1 && f__nowwriting(f__curunit))
  54                 err(a->cierr,errno,"write start");
  55         return(0);
  56 }
  57 integer e_rdue(Void)
  58 {
  59         f__init = 1;
  60         if(f__curunit->url==1 || f__recpos==f__curunit->url)
  61                 return(0);
  62         fseek(f__cf,(long)(f__curunit->url-f__recpos),SEEK_CUR);
  63         if(ftell(f__cf)%f__curunit->url)
  64                 err(f__elist->cierr,200,"syserr");
  65         return(0);
  66 }
  67 integer e_wdue(Void)
  68 {
  69         f__init = 1;
  70 #ifdef ALWAYS_FLUSH
  71         if (fflush(f__cf))
  72                 err(f__elist->cierr,errno,"write end");
  73 #endif
  74         return(e_rdue());
  75 }