--- ray/src/px/ra_hexbit.c	1998/07/08 18:01:00	3.1
+++ ray/src/px/ra_hexbit.c	2019/12/28 18:05:14	3.6
@@ -1,34 +1,32 @@
-/* Copyright (c) 1998 Silicon Graphics, Inc. */
-
 #ifndef lint
-static char SCCSid[] = "$SunId$ SGI";
+static const char	RCSid[] = "$Id: ra_hexbit.c,v 3.6 2019/12/28 18:05:14 greg Exp $";
 #endif
-
 /*
  * Create a 4x1 hex bitmap from a Radiance picture.
  */
 
-#include  <stdio.h>
+#include  "platform.h"
 #include  "color.h"
+#include  "rtio.h"
 #include  "resolu.h"
 
-extern char  *malloc();
-
 char  *progname;
-
 int  xmax, ymax;
-
 double	thresh = 0.5;		/* threshold value */
-
 COLR	threshclr;
 
 #define abovethresh(c)	((c)[EXP]>threshclr[EXP] || \
 			((c)[EXP]==threshclr[EXP] && (c)[GRN]>threshclr[GRN]))
 
+static void quiterr(char *err);
+static void ra2hex(void);
 
-main(argc, argv)
-int  argc;
-char  *argv[];
+
+int
+main(
+	int  argc,
+	char  *argv[]
+)
 {
 	int  i;
 	
@@ -60,6 +58,8 @@ char  *argv[];
 	}
 				/* assign threshold color */
 	setcolr(threshclr, thresh, thresh, thresh);
+				/* binary input */
+	SET_FILE_BINARY(stdin);
 				/* get our header */
 	if (checkheader(stdin, COLRFMT, NULL) < 0 ||
 			fgetresolu(&xmax, &ymax, stdin) < 0)
@@ -74,8 +74,10 @@ userr:
 }
 
 
-quiterr(err)		/* print message and exit */
-char  *err;
+static void
+quiterr(		/* print message and exit */
+	char  *err
+)
 {
 	if (err != NULL) {
 		fprintf(stderr, "%s: %s\n", progname, err);
@@ -85,7 +87,8 @@ char  *err;
 }
 
 
-ra2hex()		/* convert Radiance scanlines to 4x1 bit hex */
+static void
+ra2hex(void)		/* convert Radiance scanlines to 4x1 bit hex */
 {
 	static char	cmap[] = "0123456789ABCDEF";
 	COLR	*scanin;
@@ -115,5 +118,5 @@ ra2hex()		/* convert Radiance scanlines to 4x1 bit hex
 			quiterr("error writing hex bit file");
 	}
 						/* free scanline */
-	free((char *)scanin);
+	free((void *)scanin);
 }