1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2007 AT&T Knowledge Ventures * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Knowledge Ventures * 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 37 intmax_t 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