--- ray/src/px/pextrem.c	1993/10/19 17:23:31	2.3
+++ ray/src/px/pextrem.c	2005/06/02 18:13:47	2.11
@@ -1,19 +1,17 @@
-/* Copyright (c) 1992 Regents of the University of California */
-
 #ifndef lint
-static char SCCSid[] = "$SunId$ LBL";
+static const char	RCSid[] = "$Id: pextrem.c,v 2.11 2005/06/02 18:13:47 greg Exp $";
 #endif
-
 /*
  * Find extrema points in a Radiance picture.
  */
 
 #include  <stdio.h>
 #include  <math.h>
-#ifdef MSDOS
-#include  <fcntl.h>
-#endif
+#include  <string.h>
+
+#include  "platform.h"
 #include  "color.h"
+#include  "resolu.h"
 
 
 int  orig = 0;
@@ -22,11 +20,14 @@ int  wrongformat = 0;
 
 COLOR  expos = WHTCOLOR;
 
-extern char  *malloc();
+static gethfunc headline;
 
 
-headline(s)			/* check header line */
-char  *s;
+static int
+headline(			/* check header line */
+	char  *s,
+	void	*p
+)
 {
 	char	fmt[32];
 	double	d;
@@ -34,10 +35,10 @@ char  *s;
 
 	if (isformat(s)) {			/* format */
 		formatval(fmt, s);
-		wrongformat = strcmp(fmt, COLRFMT);
+		wrongformat = !globmatch(PICFMT, fmt);
 	}
 	if (!orig)
-		return;
+		return(0);
 	if (isexpos(s)) {			/* exposure */
 		d = exposval(s);
 		scalecolor(expos, d);
@@ -45,12 +46,15 @@ char  *s;
 		colcorval(ctmp, s);
 		multcolor(expos, ctmp);
 	}
+	return(0);
 }
 
 
-main(argc, argv)
-int  argc;
-char  *argv[];
+int
+main(
+	int  argc,
+	char  *argv[]
+)
 {
 	int  i;
 	int  xres, yres;
@@ -59,11 +63,8 @@ char  *argv[];
 	COLR  *scan;
 	COLR  cmin, cmax;
 	int  xmin, ymin, xmax, ymax;
-#ifdef MSDOS
-	extern int  _fmode;
-	_fmode = O_BINARY;
-	setmode(fileno(stdin), O_BINARY);
-#endif
+	SET_DEFAULT_BINARY();
+	SET_FILE_BINARY(stdin);
 	for (i = 1; i < argc; i++)	/* get options */
 		if (!strcmp(argv[i], "-o"))
 			orig++;
@@ -85,8 +86,8 @@ char  *argv[];
 		fprintf(stderr, "%s: out of memory\n", argv[0]);
 		exit(1);
 	}
-	setcolr(cmin, 1e10, 1e10, 1e10);
-	setcolr(cmax, 0., 0., 0.);
+	setcolr(cmin, 1e30, 1e30, 1e30);
+	setcolr(cmax, 0., 0., 0.); xmax=ymax=0;
 					/* find extrema */
 	for (y = yres-1; y >= 0; y--) {
 		if (freadcolrs(scan, xres, stdin) < 0) {
@@ -110,7 +111,7 @@ char  *argv[];
 			}
 		}
 	}
-	free((char *)scan);
+	free((void *)scan);
 	printf("%d %d\t%e %e %e\n", xmin, ymin,
 			colrval(cmin,RED)/colval(expos,RED),
 			colrval(cmin,GRN)/colval(expos,GRN),