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/* Plural expression evaluation.
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Copyright (C) 2000-2003 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU Library General Public License as published
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by the Free Software Foundation; either version 2, or (at your option)
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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/* Evaluate the plural expression and return an index value. */
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plural_eval (struct expression *pexp, unsigned long int n)
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switch (pexp->operation)
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/* pexp->operation must be lnot. */
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unsigned long int arg = plural_eval (pexp->val.args[0], n);
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unsigned long int leftarg = plural_eval (pexp->val.args[0], n);
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if (pexp->operation == lor)
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return leftarg || plural_eval (pexp->val.args[1], n);
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else if (pexp->operation == land)
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return leftarg && plural_eval (pexp->val.args[1], n);
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unsigned long int rightarg = plural_eval (pexp->val.args[1], n);
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switch (pexp->operation)
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return leftarg * rightarg;
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#if !INTDIV0_RAISES_SIGFPE
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return leftarg / rightarg;
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#if !INTDIV0_RAISES_SIGFPE
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return leftarg % rightarg;
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return leftarg + rightarg;
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return leftarg - rightarg;
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return leftarg < rightarg;
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return leftarg > rightarg;
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return leftarg <= rightarg;
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case greater_or_equal:
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return leftarg >= rightarg;
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return leftarg == rightarg;
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return leftarg != rightarg;
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/* pexp->operation must be qmop. */
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unsigned long int boolarg = plural_eval (pexp->val.args[0], n);
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return plural_eval (pexp->val.args[boolarg ? 1 : 2], n);