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- #include "f2c.h"
- #include "fio.h"
- integer s_rdue(a) cilist *a;
- {
- int n;
- if(n=c_due(a)) return(n);
- reading=1;
- if(curunit->uwrt && nowreading(curunit))
- err(a->cierr,errno,"read start");
- return(0);
- }
- integer s_wdue(a) cilist *a;
- {
- int n;
- if(n=c_due(a)) return(n);
- reading=0;
- if(curunit->uwrt != 1 && nowwriting(curunit))
- err(a->cierr,errno,"write start");
- return(0);
- }
- c_due(a) cilist *a;
- {
- if(!init) f_init();
- if(a->ciunit>=MXUNIT || a->ciunit<0)
- err(a->cierr,101,"startio");
- recpos=sequential=formatted=0;
- external=1;
- curunit = &units[a->ciunit];
- elist=a;
- if(curunit->ufd==NULL && fk_open(DIR,UNF,a->ciunit) ) err(a->cierr,104,"due");
- cf=curunit->ufd;
- if(curunit->ufmt) err(a->cierr,102,"cdue")
- if(!curunit->useek) err(a->cierr,104,"cdue")
- if(curunit->ufd==NULL) err(a->cierr,114,"cdue")
- (void) fseek(cf,(long)(a->cirec-1)*curunit->url,SEEK_SET);
- curunit->uend = 0;
- return(0);
- }
- integer e_rdue()
- {
- if(curunit->url==1 || recpos==curunit->url)
- return(0);
- (void) fseek(cf,(long)(curunit->url-recpos),SEEK_CUR);
- if(ftell(cf)%curunit->url)
- err(elist->cierr,200,"syserr");
- return(0);
- }
- integer e_wdue()
- {
- return(e_rdue());
- }
-