1 files changed, 101 insertions, 0 deletions
diff --git a/intl/plural-eval.c b/intl/plural-eval.c
new file mode 100644
index 0000000000..ed29e201b2
--- /dev/null
+++ b/intl/plural-eval.c
@@ -0,0 +1,101 @@
+/* Plural expression evaluation.
+   Copyright (C) 2000, 2001 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C 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 C 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 C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+static unsigned long int plural_eval (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:
+		return leftarg / rightarg;
+	      case module:
+		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;
+}