/*********************************************************************** * * * This software is part of the ast package * * Copyright (c) 1985-2007 AT&T Intellectual Property * * and is licensed under the * * Common Public License, Version 1.0 * * by AT&T Intellectual Property * * * * A copy of the License is available at * * http://www.opensource.org/licenses/cpl1.0.txt * * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * * * * Information and Software Systems Research * * AT&T Research * * Florham Park NJ * * * * Glenn Fowler <gsf@research.att.com> * * David Korn <dgk@research.att.com> * * Phong Vo <kpv@research.att.com> * * * ***********************************************************************/ #pragma prototyped /* * Glenn Fowler * AT&T Research * * internal representation conversion support */ #include <ast.h> #include <swap.h> /* * return the swap operation for external to internal conversion * if size<0 then (-size) used and (-size==4)&&(op==3) => op=7 * this is a workaround for 4 byte magic predicting 8 byte swap */ int swapop(const void* internal, const void* external, int size) { register int op; register int z; char tmp[sizeof(intmax_t)]; if ((z = size) < 0) z = -z; if (z <= 1) return 0; if (z <= sizeof(intmax_t)) for (op = 0; op < z; op++) if (!memcmp(internal, swapmem(op, external, tmp, z), z)) { if (size < 0 && z == 4 && op == 3) op = 7; return op; } return -1; }