--- ray/src/util/rfluxmtx.c	2015/05/21 05:54:54	2.29
+++ ray/src/util/rfluxmtx.c	2015/09/13 21:09:20	2.31
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char RCSid[] = "$Id: rfluxmtx.c,v 2.29 2015/05/21 05:54:54 greg Exp $";
+static const char RCSid[] = "$Id: rfluxmtx.c,v 2.31 2015/09/13 21:09:20 greg Exp $";
 #endif
 /*
  * Calculate flux transfer matrix or matrices using rcontrib
@@ -142,6 +142,20 @@ surf_type(const char *otype)
 	return(ST_NONE);
 }
 
+/* Check if any of the characters in str2 are found in str1 */
+static int
+matchany(const char *str1, const char *str2)
+{
+	while (*str1) {
+		const char	*cp = str2;
+		while (*cp)
+			if (*cp++ == *str1)
+				return(*str1);
+		++str1;
+	}
+	return(0);
+}
+
 /* Add arguments to oconv command */
 static char *
 oconv_command(int ac, char *av[])
@@ -156,31 +170,28 @@ oconv_command(int ac, char *av[])
 		strcpy(cp, *av++);
 		while (*cp) cp++;
 		*cp++ = ' ';
-		if (cp >= oconvbuf+(sizeof(oconvbuf)-32)) {
-			fputs(progname, stderr);
-			fputs(": too many file arguments!\n", stderr);
-			exit(1);
-		}
+		if (cp >= oconvbuf+(sizeof(oconvbuf)-32))
+			goto overrun;
 	}
-	strcpy(cp, recv);	/* receiver goes last */
+				/* receiver goes last */
+	if (matchany(recv, SPECIALS)) {
+		*cp++ = QUOTCHAR;
+		while (*recv) {
+			if (cp >= oconvbuf+(sizeof(oconvbuf)-3))
+				goto overrun;
+			*cp++ = *recv++;
+		}
+		*cp++ = QUOTCHAR;
+		*cp = '\0';
+	} else
+		strcpy(cp, recv);
 	return(oconvbuf);
+overrun:
+	fputs(progname, stderr);
+	fputs(": too many file arguments!\n", stderr);
+	exit(1);
 }
 
-/* Check if any of the characters in str2 are found in str1 */
-static int
-matchany(const char *str1, const char *str2)
-{
-	while (*str1) {
-		const char	*cp = str2;
-		while (*cp)
-			if (*cp++ == *str1)
-				return(*str1);
-		++str1;
-	}
-	return(0);
-}
-
-
 /* Convert a set of arguments into a command line for pipe() or system() */
 static char *
 convert_commandline(char *cmd, const int len, char *av[])
@@ -194,10 +205,10 @@ convert_commandline(char *cmd, const int len, char *av
 			fputs(progname, stderr);
 			return(NULL);
 		}
-		if ((match = matchany(*av, SPECIALS))) {
+		if (matchany(*av, SPECIALS)) {
 			const int	quote =
 #ifdef ALTQUOT
-				(match == QUOTCHAR) ? ALTQUOT :
+				strchr(*av, QUOTCHAR) ? ALTQUOT :
 #endif
 					QUOTCHAR;
 			*cp++ = quote;
@@ -674,7 +685,7 @@ sample_origin(PARAMS *p, FVECT orig, const FVECT rdir,
 					/* special case for lone surface */
 	if (p->nsurfs == 1) {
 		sp = p->slist;
-		if (DOT(sp->snrm, rdir) >= -FTINY) {
+		if (DOT(sp->snrm, rdir) >= FTINY) {
 			fprintf(stderr,
 				"%s: internal - sample behind sender '%s'\n",
 					progname, sp->sname);