libf2c/libI77/sue.c

   1 #include "config.h"
   2 #include "f2c.h"
   3 #include "fio.h"
   4 extern uiolen f__reclen;
   5 off_t f__recloc;
   6
   7 #ifdef KR_headers
   8 c_sue(a) cilist *a;
   9 #else
  10 c_sue(cilist *a)
  11 #endif
  12 {
  13         f__external=f__sequential=1;
  14         f__formatted=0;
  15         f__curunit = &f__units[a->ciunit];
  16         if(a->ciunit >= MXUNIT || a->ciunit < 0)
  17                 err(a->cierr,101,"startio");
  18         f__elist=a;
  19         if(f__curunit->ufd==NULL && fk_open(SEQ,UNF,a->ciunit))
  20                 err(a->cierr,114,"sue");
  21         f__cf=f__curunit->ufd;
  22         if(f__curunit->ufmt) err(a->cierr,103,"sue");
  23         if(!f__curunit->useek) err(a->cierr,103,"sue");
  24         return(0);
  25 }
  26 #ifdef KR_headers
  27 integer s_rsue(a) cilist *a;
  28 #else
  29 integer s_rsue(cilist *a)
  30 #endif
  31 {
  32         int n;
  33         if(f__init != 1) f_init();
  34         f__init = 3;
  35         f__reading=1;
  36         if(n=c_sue(a)) return(n);
  37         f__recpos=0;
  38         if(f__curunit->uwrt && f__nowreading(f__curunit))
  39                 err(a->cierr, errno, "read start");
  40         if(fread((char *)&f__reclen,sizeof(uiolen),1,f__cf)
  41                 != 1)
  42         {       if(feof(f__cf))
  43                 {       f__curunit->uend = 1;
  44                         err(a->ciend, EOF, "start");
  45                 }
  46                 clearerr(f__cf);
  47                 err(a->cierr, errno, "start");
  48         }
  49         return(0);
  50 }
  51 #ifdef KR_headers
  52 integer s_wsue(a) cilist *a;
  53 #else
  54 integer s_wsue(cilist *a)
  55 #endif
  56 {
  57         int n;
  58         if(f__init != 1) f_init();
  59         f__init = 3;
  60         if(n=c_sue(a)) return(n);
  61         f__reading=0;
  62         f__reclen=0;
  63         if(f__curunit->uwrt != 1 && f__nowwriting(f__curunit))
  64                 err(a->cierr, errno, "write start");
  65         f__recloc=FTELL(f__cf);
  66         FSEEK(f__cf,(off_t)sizeof(uiolen),SEEK_CUR);
  67         return(0);
  68 }
  69 integer e_wsue(Void)
  70 {       off_t loc;
  71         f__init = 1;
  72         fwrite((char *)&f__reclen,sizeof(uiolen),1,f__cf);
  73 #ifdef ALWAYS_FLUSH
  74         if (fflush(f__cf))
  75                 err(f__elist->cierr, errno, "write end");
  76 #endif
  77         loc=FTELL(f__cf);
  78         FSEEK(f__cf,f__recloc,SEEK_SET);
  79         fwrite((char *)&f__reclen,sizeof(uiolen),1,f__cf);
  80         FSEEK(f__cf,loc,SEEK_SET);
  81         return(0);
  82 }
  83 integer e_rsue(Void)
  84 {
  85         f__init = 1;
  86         FSEEK(f__cf,(off_t)(f__reclen-f__recpos+sizeof(uiolen)),SEEK_CUR);
  87         return(0);
  88 }