diff -ur codec.orig/c-code/cdecoder.c codec.patched/c-code/cdecoder.c
--- codec.orig/c-code/cdecoder.c	1995-06-06 11:32:14.000000000 +0200
+++ codec.patched/c-code/cdecoder.c	2014-11-18 22:53:06.000000000 +0100
@@ -67,23 +67,23 @@
 	/* Parse arguments */
 	if ( argc != 3 )
 	{
-		puts( "usage : cdecoder input_file output_file" );
-		puts( "format for input_file  : $6B21...114 bits");
-		puts( "       ...$6B22...114..." );
-		puts( "       ...$6B26...114...$6B21");
-		puts( "format for output_file : two 138 (BFI + 137) bit frames");
+		fputs("usage : cdecoder input_file output_file",stderr );
+		fputs("format for input_file  : $6B21...114 bits",stderr);
+		fputs("       ...$6B22...114...",stderr );
+		fputs("       ...$6B26...114...$6B21",stderr);
+		fputs("format for output_file : two 138 (BFI + 137) bit frames",stderr);
 		exit( 1 );
 	}
 
 	if ( (fin = fopen( argv[1], "rb" )) == NULL )
 	{
-		puts("cdecoder: can't open input_file" );
+		fputs("cdecoder: can't open input_file" ,stderr);
 		exit( 1 );
 	}
 
 	if ( (fout = fopen( argv[2], "wb" )) == NULL )
 	{
-		puts("cdecoder: can't open output_file" );
+		fputs("cdecoder: can't open output_file",stderr );
 		exit( 1 );
 	}
 
@@ -93,7 +93,7 @@
 /* read Input_array (1 TETRA frame = 2 speech frames) from input file */
 		if (Read_Tetra_File (fin, Interleaved_coded_array) == -1)
 		  {
-		  puts ("cdecoder: reached end of input_file");
+		  fputs ("cdecoder: reached end of input_file",stderr);
 		  break;
 		  }
 				 
@@ -116,7 +116,7 @@
 in "Coded_array" */
 
 /* Message in case the Frame was stolen */
-		if (bfi1) printf("Frame Nb %ld was stolen\n",Loop_counter+1);
+		if (bfi1) fprintf(stderr,"Frame Nb %ld was stolen\n",Loop_counter+1);
 
 /* Channel Decoding */
 		bfi2 = Channel_Decoding(first_pass,Frame_stealing,
@@ -126,35 +126,35 @@
 /* Increment Loop counter */
 		Loop_counter++;
 /* Message in case the Bad Frame Indicator was set */
-		if (bfi2) printf("Frame Nb %ld Bfi active\n\n",Loop_counter);
+		if (bfi2) fprintf(stderr,"Frame Nb %ld Bfi active\n\n",Loop_counter);
 
 /* writing  Reordered_array to output file */
 			      /* bfi bit */
 		if( fwrite( &bfi1, sizeof(short), 1, fout ) != 1 ) {
-			puts( "cdecoder: can't write to output_file" );
+			fputs( "cdecoder: can't write to output_file",stderr );
 			break;
 		}
 			     /* 1st speech frame */
 		if( fwrite( Reordered_array, sizeof(short), 137, fout ) != 137 )
 		{
-			puts( "cdecoder: can't write to output_file" );
+			fputs("cdecoder: can't write to output_file",stderr );
 			break;
 		}
 			      /* bfi bit */
 		if( fwrite( &bfi2, sizeof(short), 1, fout ) != 1 ) {
-			puts( "cdecoder: can't write to output_file" );
+			fputs("cdecoder: can't write to output_file",stderr );
 			break;
 		}
 			     /* 2nd speech frame */
 		if( fwrite( Reordered_array+137, sizeof(short), 137, fout ) 
 					!= 137 ) {
-			puts( "cdecoder: can't write to output_file" );
+			fputs("cdecoder: can't write to output_file",stderr );
 			break;
 		}
 	}
 		
-	printf("%ld Channel Frames processed\n",Loop_counter);
-	printf("ie %ld Speech Frames\n",2*Loop_counter);
+	fprintf(stderr,"%ld Channel Frames processed\n",Loop_counter);
+	fprintf(stderr,"ie %ld Speech Frames\n",2*Loop_counter);
 	
 	/* closing files */
 	fclose( fin );
diff -ur codec.orig/c-code/sdecoder.c codec.patched/c-code/sdecoder.c
--- codec.orig/c-code/sdecoder.c	1995-06-06 10:55:28.000000000 +0200
+++ codec.patched/c-code/sdecoder.c	2014-11-18 22:53:06.000000000 +0100
@@ -58,15 +58,15 @@
 
   if ( argc != 3 )
   {
-     printf("Usage : sdecoder  serial_file  synth_file\n");
-     printf("\n");
-     printf("Format for serial_file:\n");
-     printf("  Serial stream input is read from a binary file\n");
-     printf("  where each 16-bit word represents 1 encoded bit.\n");
-     printf("  BFI + 137 bits by frame\n");
-     printf("\n");
-     printf("Format for synth_file:\n");
-     printf("  Synthesis is written to a binary file of 16 bits data.\n");
+     fprintf(stderr,"Usage : sdecoder  serial_file  synth_file\n");
+     fprintf(stderr,"\n");
+     fprintf(stderr,"Format for serial_file:\n");
+     fprintf(stderr,"  Serial stream input is read from a binary file\n");
+     fprintf(stderr,"  where each 16-bit word represents 1 encoded bit.\n");
+     fprintf(stderr,"  BFI + 137 bits by frame\n");
+     fprintf(stderr,"\n");
+     fprintf(stderr,"Format for synth_file:\n");
+     fprintf(stderr,"  Synthesis is written to a binary file of 16 bits data.\n");
      exit( 1 );
   }
 
@@ -74,13 +74,13 @@
 
   if( (f_serial = fopen(argv[1],"rb") ) == NULL )
   {
-    printf("Input file '%s' does not exist !!\n",argv[1]);
+    fprintf(stderr,"Input file '%s' does not exist !!\n",argv[1]);
     exit(0);
   }
 
   if( (f_syn = fopen(argv[2], "wb") ) == NULL )
   {
-    printf("Cannot open file '%s' !!\n", argv[2]);
+    fprintf(stderr,"Cannot open file '%s' !!\n", argv[2]);
     exit(0);
   }
 
@@ -95,7 +95,7 @@
 
   while( fread(serial, sizeof(Word16), serial_size, f_serial) == serial_size)
   {
-    printf("frame=%d\n", ++frame);
+    fprintf(stderr,"frame=%d\n", ++frame);
 
     Bits2prm_Tetra(serial, parm);	/* serial to parameters */