2001-10-09 Gerardo Ballabio <ballabio@sissa.it>

	* cxx/isfuns.cc: New file.

1 files changed, 104 insertions, 0 deletions

diff --git a/cxx/isfuns.cc b/cxx/isfuns.cc
new file mode 100644
index 000000000..c29ed7f03
--- /dev/null
+++ b/cxx/isfuns.cc
@@ -0,0 +1,104 @@
+/* Auxiliary functions for C++-style input of GMP types.
+
+Copyright 2001 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or (at your
+option) any later version.
+
+The GNU MP Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+MA 02111-1307, USA. */
+
+#include <cctype>
+#include <iostream>
+#include <string>
+#include "gmp.h"
+#include "gmp-impl.h"
+
+int
+__gmp_istream_set_base (istream &i, char &c, bool &zero, bool &showbase)
+{
+  int base;
+
+  zero = showbase = false;
+  switch (i.flags() & ios::basefield)
+    {
+    case ios::dec:
+      base = 10;
+      break;
+    case ios::hex:
+      base = 16;
+      break;
+    case ios::oct:
+      base = 8;
+      break;
+    default:
+      showbase = true; // look for initial "0" or "0x" or "0X"
+      if (c == '0')
+	{
+	  if (! i.get(c))
+	    c = 0; // reset or we might loop indefinitely
+
+	  if (c == 'x' || c == 'X')
+	    {
+	      base = 16;
+	      i.get(c);
+	    }
+	  else
+	    {
+	      base = 8;
+	      zero = true; // if no other digit is read, the "0" counts
+	    }
+	}
+      else
+	base = 10;
+      break;
+    }
+
+  return base;
+}
+
+void
+__gmp_istream_set_digits (string &s, istream &i, char &c, bool &ok, int base)
+{
+  switch (base)
+    {
+    case 10:
+      while (isdigit(c))
+	{
+	  ok = true; // at least a valid digit was read
+	  s += c;
+	  if (! i.get(c))
+	    break;
+	}
+      break;
+    case 8:
+      while (isdigit(c) && c != '8' && c != '9')
+	{
+	  ok = true; // at least a valid digit was read
+	  s += c;
+	  if (! i.get(c))
+	    break;
+	}
+      break;
+    case 16:
+      while (isxdigit(c))
+	{
+	  ok = true; // at least a valid digit was read
+	  s += c;
+	  if (! i.get(c))
+	    break;
+	}
+      break;
+    }
+}