--- ray/src/common/readoct.c	2003/06/07 12:50:20	2.17
+++ ray/src/common/readoct.c	2023/06/08 17:39:13	2.33
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char	RCSid[] = "$Id: readoct.c,v 2.17 2003/06/07 12:50:20 schorsch Exp $";
+static const char	RCSid[] = "$Id: readoct.c,v 2.33 2023/06/08 17:39:13 greg Exp $";
 #endif
 /*
  *  readoct.c - routines to read octree information.
@@ -8,24 +8,23 @@ static const char	RCSid[] = "$Id: readoct.c,v 2.17 200
 #include "copyright.h"
 
 #include  <stdio.h>
-#ifdef _WIN32
- #define popen _popen
- #define pclose _pclose
-#endif
+#include  <time.h>
 
+#include  "platform.h"
+#include  "paths.h"
 #include  "standard.h"
 #include  "octree.h"
 #include  "object.h"
 #include  "otypes.h"
 #include  "resolu.h"
 
-static double  ogetflt();
-static long  ogetint();
-static char  *ogetstr();
-static int  nonsurfinset();
+static double  ogetflt(void);
+static long  ogetint(int);
+static char  *ogetstr(char *);
+static int  nonsurfintree(OCTREE ot);
 static void  octerror(int  etyp, char  *msg);
 static void  skiptree(void);
-static OCTREE  getfullnode(), gettree();
+static OCTREE  getfullnode(void), gettree(void);
 
 static char  *infn;			/* input file specification */
 static FILE  *infp;			/* input file stream */
@@ -35,12 +34,15 @@ static OBJECT  fnobjects;		/* number of objects in thi
 
 
 int
-readoct(inpspec, load, scene, ofn)	/* read in octree file or stream */
-char  *inpspec;
-int  load;
-CUBE  *scene;
-char  *ofn[];
+readoct(				/* read in octree file or stream */
+	char  *inpspec,
+	int  load,
+	CUBE  *scene,
+	char  *ofn[]
+)
 {
+	time_t  oct_t = 0;
+	time_t	last_it = 0;
 	char  sbuf[512];
 	int  nf;
 	int  i;
@@ -62,7 +64,11 @@ char  *ofn[];
 					inpspec);
 			error(SYSTEM, errmsg);
 		}
+		oct_t = fddate(fileno(infp));
 	}
+#ifdef getc_unlocked			/* avoid stupid semaphores */
+	flockfile(infp);
+#endif
 	SET_FILE_BINARY(infp);
 					/* get header */
 	if (checkheader(infp, OCTFMT, load&IO_INFO ? stdout : (FILE *)NULL) < 0)
@@ -87,6 +93,11 @@ char  *ofn[];
 			readobj(sbuf);
 		if (load & IO_FILES)
 			ofn[nf] = savqstr(sbuf);
+		if (oct_t > last_it) {
+			time_t	t = fdate(sbuf);
+			if (t > last_it)
+				last_it = t;
+		}
 		nf++;
 	}
 	if (load & IO_FILES)
@@ -101,7 +112,7 @@ char  *ofn[];
 	else if (load & IO_SCENE && nf == 0)
 		skiptree();
 		
-	if (load & IO_SCENE)		/* get the scene */
+	if (load & IO_SCENE) {		/* get the scene */
 	    if (nf == 0) {
 					/* load binary scene data */
 		readscene(infp, objsize);
@@ -111,21 +122,25 @@ char  *ofn[];
 		if (nobjects != objorig+fnobjects)
 			octerror(USER, "bad object count; octree stale?");
 				/* check for non-surfaces */
-		if (dosets(nonsurfinset))
+		if (oct_t <= last_it && nonsurfintree(scene->cutree))
 			octerror(USER, "modifier in tree; octree stale?");
 	    }
+	}
 				/* close the input */
 	if (infn[0] == '!')
 		pclose(infp);
-	else
+	else if (infp != stdin)
 		fclose(infp);
+#ifdef getc_unlocked
+	else
+		funlockfile(infp);
+#endif
 	return(nf);
 }
 
 
 static char *
-ogetstr(s)			/* get null-terminated string */
-char  *s;
+ogetstr(char *s)		/* get null-terminated string */
 {
 	extern char  *getstr();
 
@@ -154,8 +169,7 @@ getfullnode()			/* get a set, return fullnode */
 
 
 static long
-ogetint(siz)			/* get a siz-byte integer */
-int  siz;
+ogetint(int siz)		/* get a siz-byte integer */
 {
 	extern long  getint();
 	register long  r;
@@ -202,20 +216,27 @@ gettree()			/* get a pre-ordered octree */
 	default:
 		octerror(USER, "damaged octree");
 	}
-	return NULL; /* pro forma return */
+	return EMPTY; /* pro forma return */
 }
 
 
 static int
-nonsurfinset(os)			/* check set for modifier */
-register OBJECT  *os;
+nonsurfintree(OCTREE ot)		/* check tree for modifiers */
 {
-	register OBJECT  s;
+	OBJECT  set[MAXSET+1];
 	register int  i;
 
-	for (i = *os; i-- > 0; )
-		if ((s = *++os) >= objorig && s < objorig+fnobjects &&
-				ismodifier(objptr(s)->otype))
+	if (isempty(ot))
+		return(0);
+	if (istree(ot)) {
+		for (i = 0; i < 8; i++)
+			if (nonsurfintree(octkid(ot, i)))
+				return(1);
+		return(0);
+	}
+	objset(set, ot);
+	for (i = set[0]; i > 0; i-- )
+		if (ismodifier(objptr(set[i])->otype))
 			return(1);
 	return(0);
 }
@@ -247,9 +268,7 @@ skiptree(void)				/* skip octree on input */
 
 
 static void
-octerror(etyp, msg)			/* octree error */
-int  etyp;
-char  *msg;
+octerror(int etyp, char *msg)		/* octree error */
 {
 	char  msgbuf[128];