--- ray/src/px/pextrem.c	1992/09/21 12:14:03	2.2
+++ ray/src/px/pextrem.c	2003/02/22 02:07:27	2.5
@@ -1,14 +1,12 @@
-/* Copyright (c) 1992 Regents of the University of California */
-
 #ifndef lint
-static char SCCSid[] = "$SunId$ LBL";
+static const char	RCSid[] = "$Id: pextrem.c,v 2.5 2003/02/22 02:07:27 greg Exp $";
 #endif
-
 /*
  * Find extrema points in a Radiance picture.
  */
 
 #include  <stdio.h>
+#include  <math.h>
 #ifdef MSDOS
 #include  <fcntl.h>
 #endif
@@ -21,9 +19,7 @@ int  wrongformat = 0;
 
 COLOR  expos = WHTCOLOR;
 
-extern char  *malloc();
 
-
 headline(s)			/* check header line */
 char  *s;
 {
@@ -33,10 +29,10 @@ 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);
@@ -44,6 +40,7 @@ char  *s;
 		colcorval(ctmp, s);
 		multcolor(expos, ctmp);
 	}
+	return(0);
 }
 
 
@@ -109,7 +106,7 @@ 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),