--- ray/src/hd/genrhgrid.c	2003/07/27 22:12:02	3.5
+++ ray/src/hd/genrhgrid.c	2019/10/21 18:19:32	3.10
@@ -1,10 +1,14 @@
 #ifndef lint
-static const char	RCSid[] = "$Id: genrhgrid.c,v 3.5 2003/07/27 22:12:02 schorsch Exp $";
+static const char	RCSid[] = "$Id: genrhgrid.c,v 3.10 2019/10/21 18:19:32 greg Exp $";
 #endif
 /*
  * Generate renderable grids from a holodeck file
  */
 
+#include <stdio.h>
+
+#include "platform.h"
+#include "resolu.h"
 #include "holo.h"
 
 char	*progname;		/* global argv[0] */
@@ -12,10 +16,16 @@ char	*progname;		/* global argv[0] */
 char	*mat, *name;		/* material and object id */
 double	rad;			/* grid line radius */
 
+static void gridsect(char *fname, int sect);
+static void putgrid(HOLO *hp);
+static void putline(FVECT wp[2]);
 
-main(argc, argv)
-int	argc;
-char	*argv[];
+
+int
+main(
+	int	argc,
+	char	*argv[]
+)
 {
 	int	sect;
 
@@ -37,9 +47,11 @@ userr:
 }
 
 
-gridsect(fname, sect)		/* get specified section(s) and print grids */
-char	*fname;
-int	sect;
+void
+gridsect(		/* get specified section(s) and print grids */
+	char	*fname,
+	int	sect
+)
 {
 	FILE	*fp;
 	HOLO	hdsect;
@@ -47,7 +59,7 @@ int	sect;
 	int32	nextloc;
 	int	n;
 					/* open holodeck file */
-	if ((fp = fopen(fname, "r")) == NULL) {
+	if ((fp = fopen(fname, "rb")) == NULL) {
 		sprintf(errmsg, "cannot open \"%s\"", fname);
 		error(SYSTEM, errmsg);
 	}
@@ -60,7 +72,7 @@ int	sect;
 	nextloc = ftell(fp);			/* get stdio position */
 	fclose(fp);				/* done with stdio */
 	for (n = 0; nextloc > 0L; n++) {	/* get the section(s) */
-		lseek(fd, (off_t)nextloc, 0);
+		lseek(fd, (off_t)nextloc, SEEK_SET);
 		read(fd, (char *)&nextloc, sizeof(nextloc));
 		if ((sect < 0) | (n == sect)) {
 			read(fd, (char *)&hdsect, sizeof(HDGRID));
@@ -71,10 +83,12 @@ int	sect;
 }
 
 
-putgrid(hp)			/* run through holodeck section grid lines */
-register HOLO	*hp;
+void
+putgrid(			/* run through holodeck section grid lines */
+	HOLO	*hp
+)
 {
-	register int	w, i;
+	int	w, i;
 	int	g0, g1;
 	FVECT	wp[2], mov;
 	double	d;
@@ -119,8 +133,10 @@ register HOLO	*hp;
 }
 
 
-putline(wp)		/* put out a line */
-register FVECT	wp[2];
+void
+putline(		/* put out a line */
+	FVECT	wp[2]
+)
 {
 	static int	cnt = 0;