BSD 4_1c_2 release

[unix-history] / usr / src / usr.lib / libpc / UNPACK.c

/* Copyright (c) 1979 Regents of the University of California */

static char sccsid[] = "@(#)UNPACK.c 1.3 6/10/81";


/*
* unpack(z,a,i)
*
* with:        z and a as in pack
*
* semantics:   for j := u to v do
*                      a[j-u+i] := z[j]
*/

UNPACK(i, a, z, size_a, lb_a, ub_a, size_z)

       long    i;      /* subscript into a to begin packing */
       char    *a;     /* pointer to structure a */
       char    *z;     /* pointer to structure z */
       long    size_a; /* sizeof(a_type) */
       long    lb_a;   /* lower bound of structure a */
       long    ub_a;   /* (upper bound of a) - (lb_a + sizeof(z_type)) */
       long    size_z; /* sizeof(z_type) */
{
       int             subscr;
       register char   *cp;
       register char   *zp = z;
       register char   *limit;

       subscr = i - lb_a;
       if (subscr < 0 || subscr > ub_a) {
               ERROR("i = %D: Bad i to unpack(z,a,i)\n", i);
               return;
       }
       cp = &a[subscr * size_a];
       limit = cp + size_z;
       do      {
               *cp++ = *zp++;
       } while (cp < limit);
}