BSD 4_1_snap release

[unix-history] / usr / src / lib / libI77uc / dfe.c

/*
char id_dfe[] = "@(#)dfe.c      1.2";
*
* direct formatted external i/o
*/

#include "fio.h"

extern int rd_ed(),rd_ned(),w_ed(),w_ned();
int y_getc(),y_putc(),y_rnew(),y_wnew(),y_tab();

char *dfe = "dfe";
char *rdfe = "read dfe";
char *wdfe = "write dfe";

s_rdfe(a) cilist *a;
{
       int n;
       reading = YES;
       if(n=c_dfe(a,READ)) return(n);
       if(curunit->uwrt) nowreading(curunit);
       getn = y_getc;
       doed = rd_ed;
       doned = rd_ned;
       dotab = y_tab;
       dorevert = doend = donewrec = y_rnew;
       if(pars_f(fmtbuf)) err(errflag,F_ERFMT,rdfe)
       fmt_bg();
       return(OK);
}

s_wdfe(a) cilist *a;
{
       int n;
       reading = NO;
       if(n=c_dfe(a,WRITE)) return(n);
       curunit->uend = NO;
       if(!curunit->uwrt) nowwriting(curunit);
       putn = y_putc;
       doed = w_ed;
       doned = w_ned;
       dotab = y_tab;
       dorevert = doend = donewrec = y_wnew;
       if(pars_f(fmtbuf)) err(errflag,F_ERFMT,wdfe)
       fmt_bg();
       return(OK);
}

e_rdfe()
{
       en_fio();
       return(OK);
}

e_wdfe()
{
       en_fio();
       return(OK);
}

c_dfe(a,flag) cilist *a;
{       int n;
       sequential = NO;
       external = formatted = FORMATTED;
       lfname = NULL;
       elist = NO;
       cursor=scale=recpos=reclen=0;
       radix = 10;
       signit = YES;
       fmtbuf = a->cifmt;
       errflag = a->cierr;
       endflag = a->ciend;
       lunit = a->ciunit;
       if(not_legal(lunit)) err(errflag,F_ERUNIT,dfe);
       curunit = &units[lunit];
       if(!curunit->ufd && (n=fk_open(flag,DIR,FMT,(ftnint)lunit)))
               err(errflag,n,dfe)
       cf = curunit->ufd;
       elist = YES;
       lfname = curunit->ufnm;
       if(!curunit->ufmt) err(errflag,F_ERNOFIO,dfe)
       if(!curunit->useek || !curunit->url) err(errflag,F_ERNODIO,dfe)
       recnum = a->cirec - 1;
       fseek(cf, (long)curunit->url * recnum, 0);
       cblank = curunit->ublnk;
       cplus = NO;
       return(OK);
}

y_getc()
{
       int ch;
       if(curunit->uend) return(EOF);
       if(curunit->url==1 || recpos++ < curunit->url)
       {
               if((ch=getc(cf))!=EOF)
               {
                               return(ch);
               }
               if(feof(cf))
               {
                       curunit->uend = YES;
                       return(EOF);
               }
               err(errflag,errno,rdfe);
       }
       else return(' ');
}

y_putc(c)
{
       if(curunit->url!=1 && recpos++ >= curunit->url) err(errflag,F_EREREC,wdfe)
       putc(c,cf);
       return(OK);
}

y_tab()
{       int n;
       if(curunit->url==1)
       {
               if(cursor < 0 && -cursor > ftell(cf)) return(F_ERBREC);
       }
       else
       {       if(reclen < recpos) reclen = recpos;
               if((recpos + cursor) < 0) return(F_ERBREC);
               n = reclen - recpos;            /* n >= 0 */
               if(!reading && (cursor-n) > 0)
               {       recpos = reclen;
                       cursor -= n;
                       fseek(cf,(long)n,1);
                       while(cursor--) if(n=(*putn)(' ')) return(n);
                       return(cursor=0);
               }
               recpos += cursor;
               if(recpos >= curunit->url) err(errflag,F_EREREC,dfe)
       }
       fseek(cf,(long)cursor,1);
       return(cursor=0);
}

/*
/*y_rev()
/*{     /*what about work done?*/
/*      if(curunit->url==1) return(0);
/*      while(recpos<curunit->url) (*putn)(' ');
/*      recpos=0;
/*      return(0);
/*}
/*
/*y_err()
/*{
/*      err(errflag, F_EREREC, dfe);
/*}
*/

y_rnew()
{       if(curunit->url != 1)
       {       fseek(cf,(long)curunit->url*(++recnum),0);
               recpos = reclen = cursor = 0;
       }
       return(OK);
}

y_wnew()
{       if(curunit->url != 1)
       {       if(reclen > recpos)
               {       fseek(cf,(long)(reclen-recpos),1);
                       recpos = reclen;
               }
               while(recpos < curunit->url) (*putn)(' ');
               recnum++;
               recpos = reclen = cursor = 0;
       }
       return(OK);
}

y_rend()
{
       return(OK);
}

y_wend()
{
       return(y_wnew());
}