BSD 4_3_Tahoe release

[unix-history] / usr / src / sys / stand / docopy.c

/*
* Copyright (c) 1988 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley.  The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
*      @(#)docopy.c    7.2 (Berkeley) 6/29/88
*/

#define SIZE    10240

docopy(from, to, nrecs)
       register int from, to, nrecs;
{
       register int record, rcc, wcc;
       char buf[SIZE];

       for (record = 0;;) {
               if (!(rcc = read(from, buffer, SIZE)))
                       break;
               if (rcc < 0) {
                       printf("Record %d: read error, errno=%d\n",
                           record, errno);
                       break;
               }
               if (rcc < SIZE)
                       printf("Record %d: read short; expected %d, got %d\n",
                           record, SIZE, rcc);
#ifdef vax
               /* For bug in ht driver. */
               if (rcc > SIZE)
                       rcc = SIZE;
#endif
               if ((wcc = write(to, buffer, rcc)) < 0) {
                       printf("Record %d: write error: errno=%d\n",
                           record, errno);
                       break;
               }
               if (wcc < rcc) {
                       printf("Record %d: write short; expected %d, got %d\n",
                           record, rcc, wcc);
                       break;
               }
               if (nrecs > 0 && ++record == nrecs)
                       break;
       }
       printf("copy completed: %d records copied\n", record);
}