1 /***********************************************************************
2 * *
3 * This software is part of the ast package *
4 * Copyright (c) 1985-2011 AT&T Intellectual Property *
5 * and is licensed under the *
6 * Eclipse Public License, Version 1.0 *
7 * by AT&T Intellectual Property *
8 * *
9 * A copy of the License is available at *
10 * http://www.eclipse.org/org/documents/epl-v10.html *
11 * (with md5 checksum b35adb5213ca9657e911e9befb180842) *
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
37 intmax_t
swapget(int op,const void * b,int n)38 swapget(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