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Annotation of 43BSDReno/lib/libpc/UNPACK.c, revision 1.1.1.1

1.1       root        1: /*-
                      2:  * Copyright (c) 1979 The Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that: (1) source distributions retain this entire copyright
                      7:  * notice and comment, and (2) distributions including binaries display
                      8:  * the following acknowledgement:  ``This product includes software
                      9:  * developed by the University of California, Berkeley and its contributors''
                     10:  * in the documentation or other materials provided with the distribution
                     11:  * and in all advertising materials mentioning features or use of this
                     12:  * software. Neither the name of the University nor the names of its
                     13:  * contributors may be used to endorse or promote products derived
                     14:  * from this software without specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #ifndef lint
                     21: static char sccsid[] = "@(#)UNPACK.c   1.4 (Berkeley) 4/9/90";
                     22: #endif /* not lint */
                     23: 
                     24: /*
                     25:  * unpack(z,a,i)
                     26:  *
                     27:  * with:       z and a as in pack
                     28:  *
                     29:  * semantics:  for j := u to v do
                     30:  *                     a[j-u+i] := z[j]
                     31:  */
                     32: 
                     33: UNPACK(i, a, z, size_a, lb_a, ub_a, size_z)
                     34: 
                     35:        long    i;      /* subscript into a to begin packing */
                     36:        char    *a;     /* pointer to structure a */
                     37:        char    *z;     /* pointer to structure z */
                     38:        long    size_a; /* sizeof(a_type) */
                     39:        long    lb_a;   /* lower bound of structure a */
                     40:        long    ub_a;   /* (upper bound of a) - (lb_a + sizeof(z_type)) */
                     41:        long    size_z; /* sizeof(z_type) */
                     42: {
                     43:        int             subscr;
                     44:        register char   *cp;
                     45:        register char   *zp = z;
                     46:        register char   *limit;
                     47: 
                     48:        subscr = i - lb_a;
                     49:        if (subscr < 0 || subscr > ub_a) {
                     50:                ERROR("i = %D: Bad i to unpack(z,a,i)\n", i);
                     51:                return;
                     52:        }
                     53:        cp = &a[subscr * size_a];
                     54:        limit = cp + size_z;
                     55:        do      {
                     56:                *cp++ = *zp++;
                     57:        } while (cp < limit);
                     58: }

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