--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/intl/eval-plural.h	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,114 @@
+/* Plural expression evaluation.
+   Copyright (C) 2000-2002 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify it
+   under the terms of the GNU Library General Public License as published
+   by the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301,
+   USA.  */
+
+#ifndef STATIC
+#define STATIC static
+#endif
+
+/* Evaluate the plural expression and return an index value.  */
+STATIC unsigned long int plural_eval PARAMS ((struct expression *pexp,
+					      unsigned long int n))
+     internal_function;
+
+STATIC
+unsigned long int
+internal_function
+plural_eval (pexp, n)
+     struct expression *pexp;
+     unsigned long int n;
+{
+  switch (pexp->nargs)
+    {
+    case 0:
+      switch (pexp->operation)
+	{
+	case var:
+	  return n;
+	case num:
+	  return pexp->val.num;
+	default:
+	  break;
+	}
+      /* NOTREACHED */
+      break;
+    case 1:
+      {
+	/* pexp->operation must be lnot.  */
+	unsigned long int arg = plural_eval (pexp->val.args[0], n);
+	return ! arg;
+      }
+    case 2:
+      {
+	unsigned long int leftarg = plural_eval (pexp->val.args[0], n);
+	if (pexp->operation == lor)
+	  return leftarg || plural_eval (pexp->val.args[1], n);
+	else if (pexp->operation == land)
+	  return leftarg && plural_eval (pexp->val.args[1], n);
+	else
+	  {
+	    unsigned long int rightarg = plural_eval (pexp->val.args[1], n);
+
+	    switch (pexp->operation)
+	      {
+	      case mult:
+		return leftarg * rightarg;
+	      case divide:
+#if !INTDIV0_RAISES_SIGFPE
+		if (rightarg == 0)
+		  raise (SIGFPE);
+#endif
+		return leftarg / rightarg;
+	      case module:
+#if !INTDIV0_RAISES_SIGFPE
+		if (rightarg == 0)
+		  raise (SIGFPE);
+#endif
+		return leftarg % rightarg;
+	      case plus:
+		return leftarg + rightarg;
+	      case minus:
+		return leftarg - rightarg;
+	      case less_than:
+		return leftarg < rightarg;
+	      case greater_than:
+		return leftarg > rightarg;
+	      case less_or_equal:
+		return leftarg <= rightarg;
+	      case greater_or_equal:
+		return leftarg >= rightarg;
+	      case equal:
+		return leftarg == rightarg;
+	      case not_equal:
+		return leftarg != rightarg;
+	      default:
+		break;
+	      }
+	  }
+	/* NOTREACHED */
+	break;
+      }
+    case 3:
+      {
+	/* pexp->operation must be qmop.  */
+	unsigned long int boolarg = plural_eval (pexp->val.args[0], n);
+	return plural_eval (pexp->val.args[boolarg ? 1 : 2], n);
+      }
+    }
+  /* NOTREACHED */
+  return 0;
+}