1/***********************************************************************
2*                                                                      *
3*               This software is part of the ast package               *
4*          Copyright (c) 1985-2010 AT&T Intellectual Property          *
5*                      and is licensed under the                       *
6*                  Common Public License, Version 1.0                  *
7*                    by AT&T Intellectual Property                     *
8*                                                                      *
9*                A copy of the License is available at                 *
10*            http://www.opensource.org/licenses/cpl1.0.txt             *
11*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
12*                                                                      *
13*              Information and Software Systems Research               *
14*                            AT&T Research                             *
15*                           Florham Park NJ                            *
16*                                                                      *
17*                 Glenn Fowler <gsf@research.att.com>                  *
18*                  David Korn <dgk@research.att.com>                   *
19*                   Phong Vo <kpv@research.att.com>                    *
20*                                                                      *
21***********************************************************************/
22#pragma prototyped
23/*
24 * Glenn Fowler
25 * AT&T Research
26 *
27 * internal representation conversion support
28 */
29
30#include <ast.h>
31#include <swap.h>
32
33/*
34 * get int_n from b according to op
35 */
36
37intmax_t
38swapget(int op, const void* b, int n)
39{
40	register unsigned char*	p;
41	register unsigned char*	d;
42	intmax_t		v;
43	unsigned char		tmp[sizeof(intmax_t)];
44
45	if (n > sizeof(intmax_t))
46		n = sizeof(intmax_t);
47	if (op) swapmem(op, b, d = tmp, n);
48	else d = (unsigned char*)b;
49	p = d + n;
50	v = 0;
51	while (d < p)
52	{
53		v <<= CHAR_BIT;
54		v |= *d++;
55	}
56	return v;
57}
58