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If port provides __weak_alias(), provide an Standard C and POSIX pure
identifier namespace by renaming non standard functions and variables
such that they have a leading underscore.  The library will use those
names internally.  Weak aliases are used to provide the original names
to the API.

This is only the first part of this change.  It is most of the functions
which are implemented in C for all NetBSD ports.  Subsequent changes are
to add the same support to the remaining C files, to assembly files, and
to the automagically generated assembly source used for system calls.
When all of the above is done, ports with weak alias support should add
a definition for __weak_alias to <sys/cdefs.h>.

/*	$NetBSD: svc_simple.c,v 1.7 1997/07/21 14:08:40 jtc Exp $	*/

/*
 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
 * unrestricted use provided that this legend is included on all tape
 * media and as a part of the software program in whole or part.  Users
 * may copy or modify Sun RPC without charge, but are not authorized
 * to license or distribute it to anyone else except as part of a product or
 * program developed by the user.
 * 
 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
 * 
 * Sun RPC is provided with no support and without any obligation on the
 * part of Sun Microsystems, Inc. to assist in its use, correction,
 * modification or enhancement.
 * 
 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
 * OR ANY PART THEREOF.
 * 
 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
 * or profits or other special, indirect and consequential damages, even if
 * Sun has been advised of the possibility of such damages.
 * 
 * Sun Microsystems, Inc.
 * 2550 Garcia Avenue
 * Mountain View, California  94043
 */

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char *sccsid = "@(#)svc_simple.c 1.18 87/08/11 Copyr 1984 Sun Micro";
static char *sccsid = "@(#)svc_simple.c	2.2 88/08/01 4.0 RPCSRC";
#else
__RCSID("$NetBSD: svc_simple.c,v 1.7 1997/07/21 14:08:40 jtc Exp $");
#endif
#endif

/* 
 * svc_simple.c
 * Simplified front end to rpc.
 *
 * Copyright (C) 1984, Sun Microsystems, Inc.
 */

#include "namespace.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#include <sys/socket.h>
#include <netdb.h>

#ifdef __weak_alias
__weak_alias(registerrpc,_registerrpc);
#endif

static struct proglst {
	char *(*p_progname) __P((char [UDPMSGSIZE]));
	int  p_prognum;
	int  p_procnum;
	xdrproc_t p_inproc, p_outproc;
	struct proglst *p_nxt;
} *proglst;

static SVCXPRT *transp;
struct proglst *pl;

static void universal __P((struct svc_req *, SVCXPRT *));

int
registerrpc(prognum, versnum, procnum, progname, inproc, outproc)
	char *(*progname) __P((char [UDPMSGSIZE]));
	xdrproc_t inproc, outproc;
{
	
	if (procnum == NULLPROC) {
		(void) fprintf(stderr,
		    "can't reassign procedure number %ld\n", NULLPROC);
		return (-1);
	}
	if (transp == 0) {
		transp = svcudp_create(RPC_ANYSOCK);
		if (transp == NULL) {
			(void) fprintf(stderr, "couldn't create an rpc server\n");
			return (-1);
		}
	}
	(void) pmap_unset((u_long)prognum, (u_long)versnum);
	if (!svc_register(transp, (u_long)prognum, (u_long)versnum, 
	    universal, IPPROTO_UDP)) {
	    	(void) fprintf(stderr, "couldn't register prog %d vers %d\n",
		    prognum, versnum);
		return (-1);
	}
	pl = (struct proglst *)malloc(sizeof(struct proglst));
	if (pl == NULL) {
		(void) fprintf(stderr, "registerrpc: out of memory\n");
		return (-1);
	}
	pl->p_progname = progname;
	pl->p_prognum = prognum;
	pl->p_procnum = procnum;
	pl->p_inproc = inproc;
	pl->p_outproc = outproc;
	pl->p_nxt = proglst;
	proglst = pl;
	return (0);
}

static void
universal(rqstp, transp)
	struct svc_req *rqstp;
	SVCXPRT *transp;
{
	int prog, proc;
	char *outdata;
	char xdrbuf[UDPMSGSIZE];
	struct proglst *pl;

	/* 
	 * enforce "procnum 0 is echo" convention
	 */
	if (rqstp->rq_proc == NULLPROC) {
		if (svc_sendreply(transp, xdr_void, NULL) == FALSE) {
			(void) fprintf(stderr, "xxx\n");
			exit(1);
		}
		return;
	}
	prog = rqstp->rq_prog;
	proc = rqstp->rq_proc;
	for (pl = proglst; pl != NULL; pl = pl->p_nxt)
		if (pl->p_prognum == prog && pl->p_procnum == proc) {
			/* decode arguments into a CLEAN buffer */
			memset(xdrbuf, 0, sizeof(xdrbuf)); /* required ! */
			if (!svc_getargs(transp, pl->p_inproc, xdrbuf)) {
				svcerr_decode(transp);
				return;
			}
			outdata = (*(pl->p_progname))(xdrbuf);
			if (outdata == NULL &&
			    pl->p_outproc != xdr_void)
				/* there was an error */
				return;
			if (!svc_sendreply(transp, pl->p_outproc, outdata)) {
				(void) fprintf(stderr,
				    "trouble replying to prog %d\n",
				    pl->p_prognum);
				exit(1);
			}
			/* free the decoded arguments */
			(void)svc_freeargs(transp, pl->p_inproc, xdrbuf);
			return;
		}
	(void) fprintf(stderr, "never registered prog %d\n", prog);
	exit(1);
}