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Initial check-in based on OpenGL Performer 2.4 tree.
-flynnt

/*
 * Copyright 2000, Silicon Graphics, Inc.
 * ALL RIGHTS RESERVED
 *
 * This source code ("Source Code") was originally derived from a
 * code base owned by Silicon Graphics, Inc. ("SGI")
 * 
 * LICENSE: SGI grants the user ("Licensee") permission to reproduce,
 * distribute, and create derivative works from this Source Code,
 * provided that: (1) the user reproduces this entire notice within
 * both source and binary format redistributions and any accompanying
 * materials such as documentation in printed or electronic format;
 * (2) the Source Code is not to be used, or ported or modified for
 * use, except in conjunction with OpenGL Performer; and (3) the
 * names of Silicon Graphics, Inc.  and SGI may not be used in any
 * advertising or publicity relating to the Source Code without the
 * prior written permission of SGI.  No further license or permission
 * may be inferred or deemed or construed to exist with regard to the
 * Source Code or the code base of which it forms a part. All rights
 * not expressly granted are reserved.
 * 
 * This Source Code is provided to Licensee AS IS, without any
 * warranty of any kind, either express, implied, or statutory,
 * including, but not limited to, any warranty that the Source Code
 * will conform to specifications, any implied warranties of
 * merchantability, fitness for a particular purpose, and freedom
 * from infringement, and any warranty that the documentation will
 * conform to the program, or any warranty that the Source Code will
 * be error free.
 * 
 * IN NO EVENT WILL SGI BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT
 * LIMITED TO DIRECT, INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES,
 * ARISING OUT OF, RESULTING FROM, OR IN ANY WAY CONNECTED WITH THE
 * SOURCE CODE, WHETHER OR NOT BASED UPON WARRANTY, CONTRACT, TORT OR
 * OTHERWISE, WHETHER OR NOT INJURY WAS SUSTAINED BY PERSONS OR
 * PROPERTY OR OTHERWISE, AND WHETHER OR NOT LOSS WAS SUSTAINED FROM,
 * OR AROSE OUT OF USE OR RESULTS FROM USE OF, OR LACK OF ABILITY TO
 * USE, THE SOURCE CODE.
 * 
 * Contact information:  Silicon Graphics, Inc., 
 * 1600 Amphitheatre Pkwy, Mountain View, CA  94043, 
 * or:  http://www.sgi.com
 */

/*
 * pfso.C
 * Loader that loads a scene from a DSO.
 *
 * The DSO should have the same DSO interface version number as the Performer
 * libraries and should contain a C function called
 * "pfdLoadFile_XXX" (where XXX is the extension embedded in the DSO name)
 * or "pfdLoadFile_so".
 * The function should take either no args or a single filename arg
 * (it will be passed "/dev/null") and should return a pfNode*.
 */

#include <Performer/pf/pfNode.h>
#include <dlfcn.h>
#include <stdlib.h>
#ifdef __linux__
#include <limits.h>
#endif

extern "C" pfNode *
pfdLoadFile_so(char *fileName)
{
#ifndef __linux__
    char *version = sgigetdsoversion("libpfso.so");
    if (version == NULL) version = sgigetdsoversion("libpfso_ogl.so");
    if (version == NULL) version = sgigetdsoversion("libpfso_igl.so");
#else
	char *version = NULL;
#endif
    //
    // dlopen does not look in current directory
    // unless given a filename with '/' in it, so
    // make sure there is one...
    //
    char fileNameBuf[PATH_MAX];
    if (strchr(fileName, '/') == NULL)
    {
	sprintf(fileNameBuf, "./%s", fileName);
	fileName = fileNameBuf;
    }

#ifndef __linux__
    void *dso = sgidlopen_version(fileName, RTLD_LAZY, version, 0);
#else
    void *dso = dlopen(fileName, RTLD_LAZY);
#endif
    if (dso == NULL)
    {
	pfNotify(PFNFY_WARN, PFNFY_PRINT,
	    "pfdLoadFile_so(): can't dlopen_version %s version %s",
	    fileName, version);
	pfNotify(PFNFY_DEBUG, PFNFY_PRINT, "dlerror said: %s", dlerror());
	return NULL;
    }

    char *funName = NULL;
    char *defaultFunName = "pfdLoadFile_so";  // for lack of a better name

    //
    // If the last component of the DSO name is libpfXXX.so or libpfXXX_YYY.so
    // then the function name should be pfdLoadFile_XXX instead.
    // 
    char funNameBuf[PATH_MAX];
    char *lastcomponent;
    if ((lastcomponent = strrchr(fileName, '/')) != NULL)
	lastcomponent++;
    else
	lastcomponent = fileName;
    if (strncmp(lastcomponent, "libpf", 5) == 0)
    {
	char *ext = lastcomponent+5;
	char *ext_end;
	if ((ext_end = strrchr(ext, '_')) != NULL
	 || (ext_end = strrchr(ext, '.')) != NULL)
	{
	    sprintf(funNameBuf, "pfdLoadFile_%.*s", ext_end-ext, ext);
	    funName = funNameBuf;
	}
    }

    //
    // Try funName first, then defaultFunName...
    //
    pfNode *(*fun)(char*) = NULL;
    if ((funName==NULL || (fun = (pfNode *(*)(char*))dlsym(dso, funName))==NULL)
     && (fun = (pfNode *(*)(char*))dlsym(dso, defaultFunName)) == NULL)
    {

	if (funName != NULL)
	    pfNotify(PFNFY_WARN, PFNFY_PRINT,
		"pfdLoadFile_so(): Function \"%s\" not defined in DSO \"%s\"",
		funName, fileName);

	pfNotify(PFNFY_WARN, PFNFY_PRINT,
	    "pfdLoadFile_so(): Function \"%s\" not defined in DSO \"%s\"",
	    defaultFunName, fileName);

	return NULL;
    }

    return fun("/dev/null");
}