200 lines
4.7 KiB
Plaintext
200 lines
4.7 KiB
Plaintext
%{
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/* $NetBSD: arith.y,v 1.17 2003/09/17 17:33:36 jmmv Exp $ */
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/*-
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)arith.y 8.3 (Berkeley) 5/4/95";
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#else
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__RCSID("$NetBSD: arith.y,v 1.17 2003/09/17 17:33:36 jmmv Exp $");
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#endif
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#endif /* not lint */
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#include <stdlib.h>
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#include "expand.h"
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#include "shell.h"
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#include "error.h"
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#include "output.h"
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#include "memalloc.h"
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const char *arith_buf, *arith_startbuf;
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void yyerror(const char *);
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#ifdef TESTARITH
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int main(int , char *[]);
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int error(char *);
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#endif
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%}
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%token ARITH_NUM ARITH_LPAREN ARITH_RPAREN
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%left ARITH_OR
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%left ARITH_AND
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%left ARITH_BOR
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%left ARITH_BXOR
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%left ARITH_BAND
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%left ARITH_EQ ARITH_NE
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%left ARITH_LT ARITH_GT ARITH_GE ARITH_LE
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%left ARITH_LSHIFT ARITH_RSHIFT
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%left ARITH_ADD ARITH_SUB
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%left ARITH_MUL ARITH_DIV ARITH_REM
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%left ARITH_UNARYMINUS ARITH_UNARYPLUS ARITH_NOT ARITH_BNOT
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%%
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exp: expr {
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return ($1);
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}
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;
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expr: ARITH_LPAREN expr ARITH_RPAREN { $$ = $2; }
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| expr ARITH_OR expr { $$ = $1 ? $1 : $3 ? $3 : 0; }
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| expr ARITH_AND expr { $$ = $1 ? ( $3 ? $3 : 0 ) : 0; }
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| expr ARITH_BOR expr { $$ = $1 | $3; }
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| expr ARITH_BXOR expr { $$ = $1 ^ $3; }
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| expr ARITH_BAND expr { $$ = $1 & $3; }
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| expr ARITH_EQ expr { $$ = $1 == $3; }
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| expr ARITH_GT expr { $$ = $1 > $3; }
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| expr ARITH_GE expr { $$ = $1 >= $3; }
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| expr ARITH_LT expr { $$ = $1 < $3; }
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| expr ARITH_LE expr { $$ = $1 <= $3; }
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| expr ARITH_NE expr { $$ = $1 != $3; }
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| expr ARITH_LSHIFT expr { $$ = $1 << $3; }
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| expr ARITH_RSHIFT expr { $$ = $1 >> $3; }
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| expr ARITH_ADD expr { $$ = $1 + $3; }
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| expr ARITH_SUB expr { $$ = $1 - $3; }
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| expr ARITH_MUL expr { $$ = $1 * $3; }
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| expr ARITH_DIV expr {
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if ($3 == 0)
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yyerror("division by zero");
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$$ = $1 / $3;
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}
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| expr ARITH_REM expr {
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if ($3 == 0)
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yyerror("division by zero");
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$$ = $1 % $3;
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}
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| ARITH_NOT expr { $$ = !($2); }
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| ARITH_BNOT expr { $$ = ~($2); }
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| ARITH_SUB expr %prec ARITH_UNARYMINUS { $$ = -($2); }
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| ARITH_ADD expr %prec ARITH_UNARYPLUS { $$ = $2; }
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| ARITH_NUM
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;
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%%
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int
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arith(s)
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const char *s;
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{
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long result;
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arith_buf = arith_startbuf = s;
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INTOFF;
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result = yyparse();
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arith_lex_reset(); /* reprime lex */
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INTON;
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return (result);
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}
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/*
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* The exp(1) builtin.
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*/
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int
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expcmd(argc, argv)
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int argc;
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char **argv;
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{
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const char *p;
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char *concat;
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char **ap;
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long i;
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if (argc > 1) {
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p = argv[1];
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if (argc > 2) {
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/*
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* concatenate arguments
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*/
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STARTSTACKSTR(concat);
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ap = argv + 2;
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for (;;) {
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while (*p)
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STPUTC(*p++, concat);
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if ((p = *ap++) == NULL)
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break;
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STPUTC(' ', concat);
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}
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STPUTC('\0', concat);
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p = grabstackstr(concat);
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}
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} else
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p = "";
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i = arith(p);
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out1fmt("%ld\n", i);
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return (! i);
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}
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/*************************/
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#ifdef TEST_ARITH
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#include <stdio.h>
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main(argc, argv)
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char *argv[];
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{
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printf("%d\n", exp(argv[1]));
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}
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error(s)
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char *s;
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{
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fprintf(stderr, "exp: %s\n", s);
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exit(1);
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}
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#endif
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void
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yyerror(s)
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const char *s;
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{
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// yyerrok;
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yyclearin;
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arith_lex_reset(); /* reprime lex */
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error("arithmetic expression: %s: \"%s\"", s, arith_startbuf);
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/* NOTREACHED */
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}
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