--- ray/src/common/fropen.c	1992/09/08 10:04:29	2.5
+++ ray/src/common/fropen.c	2012/06/29 23:09:06	2.15
@@ -1,42 +1,35 @@
-/* Copyright (c) 1992 Regents of the University of California */
-
 #ifndef lint
-static char SCCSid[] = "$SunId$ LBL";
+static const char	RCSid[] = "$Id: fropen.c,v 2.15 2012/06/29 23:09:06 greg Exp $";
 #endif
-
 /*
  * Find and open a Radiance library file.
+ *
+ *  External symbols declared in rtio.h
  */
 
+#include "copyright.h"
+
 #include <stdio.h>
 
+#include "rtio.h"
 #include "paths.h"
 
-char  *libpath = NULL;		/* library search path */
 
-
 FILE *
-fropen(fname)			/* find file and open for reading */
+frlibopen(fname)		/* find file and open for reading */
 register char  *fname;
 {
-	extern char  *strcpy(), *getenv();
 	FILE  *fp;
-	char  pname[MAXPATH];
+	char  pname[PATH_MAX];
 	register char  *sp, *cp;
 
 	if (fname == NULL)
 		return(NULL);
 
-	if (ISDIRSEP(fname[0]) || fname[0] == '.')	/* absolute path */
+	if (ISABS(fname) || fname[0] == '.')	/* absolute path */
 		return(fopen(fname, "r"));
-		
-	if (libpath == NULL) {			/* get search path */
-		libpath = getenv(ULIBVAR);
-		if (libpath == NULL)
-			libpath = DEFPATH;
-	}
 						/* check search path */
-	sp = libpath;
+	sp = getrlibpath();
 	do {
 		cp = pname;
 		while (*sp && (*cp = *sp++) != PATHSEP)