14887Schin /***********************************************************************
24887Schin * *
34887Schin * This software is part of the ast package *
4*12068SRoger.Faulkner@Oracle.COM * Copyright (c) 1985-2010 AT&T Intellectual Property *
54887Schin * and is licensed under the *
64887Schin * Common Public License, Version 1.0 *
78462SApril.Chin@Sun.COM * by AT&T Intellectual Property *
84887Schin * *
94887Schin * A copy of the License is available at *
104887Schin * http://www.opensource.org/licenses/cpl1.0.txt *
114887Schin * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
124887Schin * *
134887Schin * Information and Software Systems Research *
144887Schin * AT&T Research *
154887Schin * Florham Park NJ *
164887Schin * *
174887Schin * Glenn Fowler <gsf@research.att.com> *
184887Schin * David Korn <dgk@research.att.com> *
194887Schin * Phong Vo <kpv@research.att.com> *
204887Schin * *
214887Schin ***********************************************************************/
224887Schin #pragma prototyped
234887Schin /*
244887Schin * Glenn Fowler
254887Schin * AT&T Research
264887Schin *
274887Schin * internal representation conversion support
284887Schin */
294887Schin
304887Schin #include <ast.h>
314887Schin #include <swap.h>
324887Schin
334887Schin /*
344887Schin * return the swap operation for external to internal conversion
354887Schin * if size<0 then (-size) used and (-size==4)&&(op==3) => op=7
364887Schin * this is a workaround for 4 byte magic predicting 8 byte swap
374887Schin */
384887Schin
394887Schin int
swapop(const void * internal,const void * external,int size)404887Schin swapop(const void* internal, const void* external, int size)
414887Schin {
424887Schin register int op;
434887Schin register int z;
444887Schin char tmp[sizeof(intmax_t)];
454887Schin
464887Schin if ((z = size) < 0)
474887Schin z = -z;
484887Schin if (z <= 1)
494887Schin return 0;
504887Schin if (z <= sizeof(intmax_t))
514887Schin for (op = 0; op < z; op++)
524887Schin if (!memcmp(internal, swapmem(op, external, tmp, z), z))
534887Schin {
544887Schin if (size < 0 && z == 4 && op == 3)
554887Schin op = 7;
564887Schin return op;
574887Schin }
584887Schin return -1;
594887Schin }
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