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