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[unix-history] / usr / src / usr.bin / f77 / libI77 / c_sfe.c

/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved.  The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*
*      @(#)c_sfe.c     5.1     %G%
*/

/*
* sequential formatted external I/O - common read & write routines
*/

#include "fio.h"

c_sfe(a,flag,mode,str) cilist *a; char *str; /* check */
{       unit *p;
       int n;

       external=formatted=FORMATTED;
       fmtbuf=a->cifmt;
       lfname = NULL;
       elist = NO;
       errflag = a->cierr;
       endflag = a->ciend;
       lunit = a->ciunit;
       if(not_legal(lunit)) err(errflag,F_ERUNIT,str);
       curunit = p = &units[lunit];
       if(!p->ufd && (n=fk_open(flag,mode,FMT,(ftnint)lunit)) )
               err(errflag,n,str)
       cf = curunit->ufd;
       elist = YES;
       lfname = curunit->ufnm;
       if(!p->ufmt) err(errflag,F_ERNOFIO,str)
       cursor=recpos=scale=reclen=0;
       radix = 10;
       signit = YES;
       cblank = curunit->ublnk;
       cplus = NO;
       return(OK);
}

x_tab()
{       int n;
       if(reclen < recpos) reclen = recpos;
       if(curunit->useek)
       {       if((recpos+cursor) < 0) cursor = -recpos;       /* to BOR */
               n = reclen - recpos;    /* distance to eor, n>=0 */
               if((cursor-n) > 0)
               {       fseek(cf,(long)n,1);  /* find current eor */
                       recpos = reclen;
                       cursor -= n;
               }
               else
               {       fseek(cf,(long)cursor,1);  /* do not pass go */
                       recpos += cursor;
                       return(cursor=0);
               }
       }
       else
               if(cursor < 0) return(F_ERSEEK);   /* can't go back */
       while(cursor--)
       {       if(reading)
               {       n = (*getn)();
                       if(n=='\n') return(cursor=0);   /* be tolerant */
                       if(n==EOF) return(EOF);
               }
               else    (*putn)(' ');   /* fill in the empty record */
       }
       return(cursor=0);
}