written by Kirk McKusick; add Berkeley specific copyright notice

[unix-history] / usr / src / usr.bin / pascal / libpc / RESET.c

/*-
* Copyright (c) 1979 The Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*/

#ifndef lint
static char sccsid[] = "@(#)RESET.c     1.9 (Berkeley) %G%";
#endif /* not lint */

#include "h00vars.h"

RESET(filep, name, maxnamlen, datasize)

       register struct iorec   *filep;
       char                    *name;
       long                    maxnamlen;
       long                    datasize;
{
       if (name == NULL && filep == INPUT && filep->fname[0] == '\0') {
               if (fseek(filep->fbuf, (long)0, 0) == -1) {
                       PERROR("Could not reset ", filep->pfname);
                       return;
               }
               filep->funit &= ~EOFF;
               filep->funit |= (SYNC | EOLN);
               return;
       }
       filep = GETNAME(filep, name, maxnamlen, datasize);
       filep->fbuf = fopen(filep->fname, "r");
       if (filep->fbuf == NULL) {
               /*
                * This allows unnamed temp files to be opened even if
                * they have not been rewritten yet. We decided to remove
                * this feature since the standard requires that files be
                * defined before being reset.
                *
               if (filep->funit & TEMP) {
                       filep->funit |= (EOFF | SYNC | FREAD);
                       return;
               }
                */
               PERROR("Could not open ", filep->pfname);
               return;
       }
       filep->funit |= (SYNC | FREAD);
       if (filep->funit & FTEXT)
               filep->funit |= EOLN;
       if (filep->fblk > PREDEF) {
               setbuf(filep->fbuf, &filep->buf[0]);
       }
}