From: mdw <mdw>
Date: Sat, 16 Jun 2001 13:22:59 +0000 (+0000)
Subject: Added command-line option to select output radix.
X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/commitdiff_plain/4afa7ff852b99306b4d82d7d9c295f73169ac208

Added command-line option to select output radix.
---

diff --git a/factorial.c b/factorial.c
index ac2f3fb..71f2ad2 100644
--- a/factorial.c
+++ b/factorial.c
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: factorial.c,v 1.1 2000/07/09 21:30:49 mdw Exp $
+ * $Id: factorial.c,v 1.2 2001/06/16 13:22:59 mdw Exp $
  *
  * Example factorial computation
  *
@@ -30,6 +30,9 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: factorial.c,v $
+ * Revision 1.2  2001/06/16 13:22:59  mdw
+ * Added command-line option to select output radix.
+ *
  * Revision 1.1  2000/07/09 21:30:49  mdw
  * Demo program to compute factorials.
  *
@@ -40,6 +43,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#include <mLib/mdwopt.h>
 #include <mLib/quis.h>
 #include <mLib/report.h>
 
@@ -50,20 +54,40 @@
 int main(int argc, char *argv[])
 {
   unsigned long x;
+  int r = 10;
   char *p;
   mp *f;
 
   ego(argv[0]);
 
-  if (argc != 2) {
-    pquis(stderr, "Usage: $ integer\n");
+  for (;;) {
+    static const struct option opt[] = {
+      { "radix",	OPTF_ARGREQ,	0,	'r' },
+      { 0,		0,		0,	0 }
+    };
+    int i = mdwopt(argc, argv, "r:", opt, 0, 0, 0);
+    if (i < 0)
+      break;
+    switch (i) {
+      case 'r':
+	r = atoi(optarg);
+	if (r < 2 || r > 36)
+	  die(EXIT_FAILURE, "bad radix `%s'", optarg);
+	break;
+      default:
+	exit(EXIT_FAILURE);
+    }
+  }
+
+  if (optind + 1 != argc) {
+    pquis(stderr, "Usage: $ [-r radix] integer\n");
     exit(EXIT_FAILURE);
   }
-  x = strtoul(argv[1], &p, 0);
+  x = strtoul(argv[optind], &p, 0);
   if (*p)
-    die(EXIT_FAILURE, "bad integer `%s'", argv[1]);
+    die(EXIT_FAILURE, "bad integer `%s'", argv[optind]);
   f = mp_factorial(x);
-  mp_writefile(f, stdout, 10);
+  mp_writefile(f, stdout, r);
   fputc('\n', stdout);
   mp_drop(f);
   return (0);