172 lines
4.4 KiB
Plaintext
172 lines
4.4 KiB
Plaintext
%token ARITH_OR ARITH_AND ARITH_ADD ARITH_SUBT ARITH_MULT ARITH_DIV ARITH_REM ARITH_EQ ARITH_GT ARITH_GEQ ARITH_LT ARITH_LEQ ARITH_NEQ
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%token ARITH_NUM ARITH_LPAREN ARITH_RPAREN ARITH_NOT ARITH_UNARYMINUS
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%left ARITH_OR
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%left ARITH_AND
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%left ARITH_EQ ARITH_NEQ
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%left ARITH_LT ARITH_GT ARITH_GEQ ARITH_LEQ
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%left ARITH_ADD ARITH_SUBT
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%left ARITH_MULT ARITH_DIV ARITH_REM
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%left ARITH_UNARYMINUS ARITH_NOT
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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 = { $$ = $1 ? ( $3 ? $3 : 0 ) : 0; }
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| expr ARITH_EQ expr = { $$ = $1 == $3; }
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| expr ARITH_GT expr = { $$ = $1 > $3; }
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| expr ARITH_GEQ expr = { $$ = $1 >= $3; }
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| expr ARITH_LT expr = { $$ = $1 < $3; }
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| expr ARITH_LEQ expr = { $$ = $1 <= $3; }
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| expr ARITH_NEQ expr = { $$ = $1 != $3; }
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| expr ARITH_ADD expr = { $$ = $1 + $3; }
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| expr ARITH_SUBT expr = { $$ = $1 - $3; }
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| expr ARITH_MULT expr = { $$ = $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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$$ = $1 / $3;
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}
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| expr ARITH_REM expr = { $$ = $1 % $3; }
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| ARITH_NOT expr = { $$ = !($2); }
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| ARITH_UNARYMINUS expr = { $$ = -($2); }
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| ARITH_NUM
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;
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%%
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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* $Id$
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*/
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#ifndef lint
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static char sccsid[] = "@(#)arith.y 8.1 (Berkeley) 5/31/93";
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#endif /* not lint */
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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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char *arith_buf, *arith_startbuf;
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arith(s)
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char *s;
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{
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extern arith_wasoper;
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long result;
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arith_wasoper = 1;
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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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yyerror(s)
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char *s;
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{
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extern yytext, yylval;
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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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}
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/*
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* The exp(1) builtin.
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*/
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expcmd(argc, argv)
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char **argv;
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{
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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("%d\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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