X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/mLib/blobdiff_plain/b7580524f33ee21d3ddc49fe36a71e107e87df1b..a7f86da7e19ebf61011b313e107b17ae11fe7d5d:/crc-mktab.c

diff --git a/crc-mktab.c b/crc-mktab.c
index 887315b..a3ba430 100644
--- a/crc-mktab.c
+++ b/crc-mktab.c
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: crc-mktab.c,v 1.1 2000/07/21 19:01:33 mdw Exp $
+ * $Id: crc-mktab.c,v 1.3 2001/01/20 12:06:01 mdw Exp $
  *
  * Build CRC tables
  *
@@ -30,6 +30,13 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: crc-mktab.c,v $
+ * Revision 1.3  2001/01/20 12:06:01  mdw
+ * Define flags with macros, to ensure unsignedness.
+ *
+ * Revision 1.2  2000/10/08 11:07:21  mdw
+ * With no arguments, give an error rather than spewing a big table at the
+ * user.
+ *
  * Revision 1.1  2000/07/21 19:01:33  mdw
  * Generate the CRC table rather than hardcoding it.
  *
@@ -62,11 +69,9 @@ static const char *type = 0;
 static const char *inc = 0;
 static FILE *fp;
 
-enum {
-  f_bogus = 1,
-  f_ctab = 2,
-  f_reverse = 4
-};
+#define f_bogus 1u
+#define f_ctab 2u
+#define f_reverse 4u
 
 #define BSCOL 72
 
@@ -231,11 +236,13 @@ int main(int argc, char *argv[])
 	  poly = 0x1021;
 	break;
       case 32:
-      case 0:
 	poly = 0x04c11db7;
 	flags |= f_reverse;
 	bits = 32;
 	break;
+      case 0:
+	die(EXIT_FAILURE, "no polynomial or bit width set");
+	break;
       default:
 	die(EXIT_FAILURE, "no standard polynomials for %u bits", bits);
 	break;