4.3BSD - /usr/src/usr.lib/libpc/PACK.c

   1: /* Copyright (c) 1979 Regents of the University of California */
   2: 
   3: static char sccsid[] = "@(#)PACK.c 1.3 6/10/81";
   4: 
   5: 
   6: /*
   7:  * pack(a,i,z)
   8:  *
   9:  * with:	a: array[m..n] of t
  10:  *	z: packed array[u..v] of t
  11:  *
  12:  * semantics:	for j := u to v do
  13:  *			z[j] := a[j-u+i];
  14:  *
  15:  * need to check:
  16:  *	1. i >= m
  17:  *	2. i+(v-u) <= n		(i.e. i-m <= (n-m)-(v-u))
  18:  *
  19:  * on stack:	lv(z), lv(a), rv(i) (len 4)
  20:  *
  21:  * move w(t)*(v-u+1) bytes from lv(a)+w(t)*(i-m) to lv(z)
  22:  */
  23: 
  24: PACK(i, a, z, size_a, lb_a, ub_a, size_z)
  25: 
  26:     long    i;  /* subscript into a to begin packing */
  27:     char    *a; /* pointer to structure a */
  28:     char    *z; /* pointer to structure z */
  29:     long    size_a; /* sizeof(a_type) */
  30:     long    lb_a;   /* lower bound of structure a */
  31:     long    ub_a;   /* (upper bound of a) - (lb_a + sizeof(z_type)) */
  32:     long    size_z; /* sizeof(z_type) */
  33: {
  34:     int     subscr;
  35:     register char   *cp;
  36:     register char   *zp = z;
  37:     register char   *limit;
  38: 
  39:     subscr = i - lb_a;
  40:     if (subscr < 0 || subscr > ub_a) {
  41:         ERROR("i = %D: Bad i to pack(a,i,z)\n", i);
  42:         return;
  43:     }
  44:     cp = &a[subscr * size_a];
  45:     limit = cp + size_z;
  46:     do  {
  47:         *zp++ = *cp++;
  48:     } while (cp < limit);
  49: }

Defined functions

Defined variables