[Boost-commit] svn:boost r68741 - sandbox/SOC/2011/checks/boost/checks

Subject: [Boost-commit] svn:boost r68741 - sandbox/SOC/2011/checks/boost/checks
From: muriloufg_at_[hidden]
Date: 2011-02-08 19:37:59

Author: murilov
Date: 2011-02-08 19:37:57 EST (Tue, 08 Feb 2011)
New Revision: 68741
URL: http://svn.boost.org/trac/boost/changeset/68741

Log:
- ISBN checking functions
Added:
   sandbox/SOC/2011/checks/boost/checks/
   sandbox/SOC/2011/checks/boost/checks/isbn.hpp   (contents, props changed)

Added: sandbox/SOC/2011/checks/boost/checks/isbn.hpp
==============================================================================
--- (empty file)
+++ sandbox/SOC/2011/checks/boost/checks/isbn.hpp	2011-02-08 19:37:57 EST (Tue, 08 Feb 2011)
@@ -0,0 +1,63 @@
+//  Boost checks/isbn.hpp header file  ------------------------------------//
+//  (C) Copyright Murilo Adriano Vasconcelos 2011.
+//  Distributed under the Boost Software License, Version 1.0. (See
+//  accompanying file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt
+//  See http://www.boost.org for updates, documentation, and revision history.
+
+#ifndef BOOST_ISBN_INCLUDED
+#define BOOST_ISBN_INCLUDED
+
+#include <string>
+
+namespace boost {
+
+/**
+ * This function checks if a `isbn' is a valid ISBN 
+ */
+bool is_isbn(const std::string& isbn)
+{
+	if (isbn.size() != 10) return false;
+	
+	int check = 0;
+	for (int i = 0; i < 9; ++i) {
+		if (!isdigit(isbn[i])) {
+			return false;
+		}
+		
+		check += (10 - i) * isbn[i];
+	}
+	
+	check += (isbn[9] == 'x' || isbn[9] == 'X') ? 10 : isbn[9];
+	
+	return (check % 11 == 0);
+}
+
+/**
+ * This function computes the check digit for a given ISBN in `isbn'
+ */
+char isbn_check_digit(const std::string& isbn)
+{	
+	int check = 0;
+	for (int i = 0; i < 9; ++i) {
+		if (!isdigit(isbn[i])) {
+			return false;
+		}
+		
+		check += (10 - i) * isbn[i];
+	}
+	
+	check += (isbn[9] == 'x' || isbn[9] == 'X') ? 10 : isbn[9];
+	check %= 11;
+	
+	if (check == 0) {
+		return '0';
+	}
+	check = 11 - check;
+	
+	return (check == 10) ? 'X' : (check + '0');
+}
+
+} // namespace boost
+
+#endif
\ No newline at end of file