mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-21 04:31:04 +08:00
106 lines
2.6 KiB
C
106 lines
2.6 KiB
C
/* Plural expression evaluation.
|
|
Copyright (C) 2000-2020 Free Software Foundation, Inc.
|
|
|
|
This program 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.
|
|
|
|
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 Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with this program. If not, see <https://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef STATIC
|
|
#define STATIC static
|
|
#endif
|
|
|
|
/* Evaluate the plural expression and return an index value. */
|
|
STATIC
|
|
unsigned long int
|
|
plural_eval (const 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;
|
|
}
|