--- OLD/ppm/ppmtorgb3.c	Thu Jan  1 00:00:00 1970
+++ NEW/ppm/ppmtorgb3.c	Thu Jan  1 00:00:00 1970
@@ -10,6 +10,14 @@
 ** implied warranty.
 */
 
+/*
+ * Hacked on, 2003-06-14, to support output to arbitrary filenames
+ *  (including, of course, pipes, when /dev/fd/ is available), and in
+ *  the process remove a potential buffer overflow.  All intellectual
+ *  property rights I have in the resulting derivative works I hereby
+ *  release into the public domain.  -Mouse
+ */
+
 #include "ppm.h"
 #include "pgm.h"
 
@@ -22,8 +30,9 @@
     FILE* redfile;
     FILE* grnfile;
     FILE* blufile;
-    char* basename;
-    char filename[100];
+    char *r_name;
+    char *g_name;
+    char *b_name;
     char* cp;
     pixel* pixelrow;
     register pixel* pP;
@@ -36,36 +45,45 @@
 
     ppm_init( &argc, argv );
 
-    if ( argc > 2 )
-	pm_usage( "[ppmfile]" );
-
-    if ( argc == 2 )
-	{
-	ifp = pm_openr( argv[1] );
-	basename = argv[1];
-	cp = rindex( basename, '.' );
-	if ( cp != NULL )
-	    *cp = '\0';
-	}
-    else
-	{
-	ifp = stdin;
-	basename = "noname";
-	}
+      switch (argc)
+       { case 1:
+	    ifp = stdin;
+	    r_name = "noname.red";
+	    g_name = "noname.grn";
+	    b_name = "noname.blu";
+	    break;
+	 case 2:
+	    ifp = pm_openr( argv[1] );
+	    cp = rindex( argv[1], '.' );
+	    if (cp) *cp = '\0';
+	    asprintf(&r_name,"%s.red",argv[1]);
+	    asprintf(&g_name,"%s.grn",argv[1]);
+	    asprintf(&b_name,"%s.blu",argv[1]);
+	    break;
+	 case 4:
+	    ifp = stdin;
+	    r_name = argv[1];
+	    g_name = argv[2];
+	    b_name = argv[3];
+	    break;
+	 case 5:
+	    ifp = pm_openr( argv[1] );
+	    r_name = argv[2];
+	    g_name = argv[3];
+	    b_name = argv[4];
+	    break;
+	 default:
+	    pm_usage( "[ppmfile] [r-out g-out b-out]" );
+	    break;
+       }
 
     ppm_readppminit( ifp, &cols, &rows, &maxval, &format );
     pixelrow = ppm_allocrow( cols );
-    (void) strcpy( filename, basename );
-    (void) strcat( filename, ".red" );
-    redfile = pm_openw( filename );
+    redfile = pm_openw( r_name );
     pgm_writepgminit( redfile, cols, rows, (gray) maxval, 0 );
-    (void) strcpy( filename, basename );
-    (void) strcat( filename, ".grn" );
-    grnfile = pm_openw( filename );
+    grnfile = pm_openw( g_name );
     pgm_writepgminit( grnfile, cols, rows, (gray) maxval, 0 );
-    (void) strcpy( filename, basename );
-    (void) strcat( filename, ".blu" );
-    blufile = pm_openw( filename );
+    blufile = pm_openw( b_name );
     pgm_writepgminit( blufile, cols, rows, (gray) maxval, 0 );
     grayrow = pgm_allocrow( cols );