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- #include "fio.h"
- #include "fmt.h"
- extern int rd_ed(),rd_ned(),y_getc(),y_putc(),y_err();
- extern int y_rev();
- extern int w_ed(),w_ned();
- s_rdfe(a) cilist *a;
- {
- int n;
- if(!init) f_init();
- if(n=c_dfe(a,READ))return(n);
- reading=1;
- if(curunit->uwrt) nowreading(curunit);
- getn = y_getc;
- doed = rd_ed;
- doned = rd_ned;
- dorevert = donewrec = y_err;
- doend = y_rev;
- if(pars_f(fmtbuf)<0)
- err(a->cierr,100,"startio");
- fmt_bg();
- return(0);
- }
- s_wdfe(a) cilist *a;
- {
- int n;
- if(!init) f_init();
- if(n=c_dfe(a,WRITE)) return(n);
- reading=0;
- if(!curunit->uwrt) nowwriting(curunit);
- putn = y_putc;
- doed = w_ed;
- doned= w_ned;
- dorevert = donewrec = y_err;
- doend = y_rev;
- if(pars_f(fmtbuf)<0)
- err(a->cierr,100,"startwrt");
- fmt_bg();
- return(0);
- }
- e_rdfe()
- {
- en_fio();
- return(0);
- }
- e_wdfe()
- {
- en_fio();
- return(0);
- }
- c_dfe(a,flag) cilist *a;
- {
- sequential=0;
- formatted=external=1;
- elist=a;
- cursor=scale=recpos=0;
- if(a->ciunit>MXUNIT || a->ciunit<0)
- err(a->cierr,101,"startchk");
- curunit = &units[a->ciunit];
- if(curunit->ufd==NULL && fk_open(flag,DIR,FMT,a->ciunit))
- err(a->cierr,104,"dfe");
- cf=curunit->ufd;
- if(!curunit->ufmt) err(a->cierr,102,"dfe")
- if(!curunit->useek) err(a->cierr,104,"dfe")
- fmtbuf=a->cifmt;
- fseek(cf,(long)curunit->url * (a->cirec-1),0);
- curunit->uend = 0;
- return(0);
- }
- y_getc()
- {
- int ch;
- if(curunit->uend) return(-1);
- if((ch=getc(cf))!=EOF)
- {
- recpos++;
- if(curunit->url>=recpos ||
- curunit->url==1)
- return(ch);
- else return(' ');
- }
- if(feof(cf))
- {
- curunit->uend=1;
- errno=0;
- return(-1);
- }
- err(elist->cierr,errno,"readingd");
- }
- y_putc(c)
- {
- recpos++;
- if(recpos <= curunit->url || curunit->url==1)
- putc(c,cf);
- else
- err(elist->cierr,110,"dout");
- return(0);
- }
- y_rev()
- { /*what about work done?*/
- if(curunit->url==1 || recpos==curunit->url)
- return(0);
- while(recpos<curunit->url)
- (*putn)(' ');
- recpos=0;
- return(0);
- }
- y_err()
- {
- err(elist->cierr, 110, "dfe");
- }
-