367 lines
7.8 KiB
Plaintext
367 lines
7.8 KiB
Plaintext
%{
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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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* 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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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)arith.y 8.3 (Berkeley) 5/4/95";
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#endif
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#endif /* not lint */
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/*
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD: src/bin/sh/arith.y,v 1.19 2004/05/24 10:11:31 stefanf Exp $");
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*/
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#include <limits.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "shell.h"
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#include "arith.h"
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#include "arith_lex.h"
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#include "var.h"
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%}
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%union {
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arith_t l_value;
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char* s_value;
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}
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%token <l_value> ARITH_NUM ARITH_LPAREN ARITH_RPAREN
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%token <s_value> ARITH_VAR
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%type <l_value> expr
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%right ARITH_ASSIGN
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%right ARITH_ADDASSIGN ARITH_SUBASSIGN
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%right ARITH_MULASSIGN ARITH_DIVASSIGN ARITH_REMASSIGN
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%right ARITH_RSHASSIGN ARITH_LSHASSIGN
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%right ARITH_BANDASSIGN ARITH_BXORASSIGN ARITH_BORASSIGN
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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:
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expr
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{ return ($1); }
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;
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expr:
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ARITH_LPAREN expr ARITH_RPAREN
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{ $$ = $2; } |
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expr ARITH_OR expr
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{ $$ = $1 ? $1 : $3 ? $3 : 0; } |
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expr ARITH_AND expr
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{ $$ = $1 ? ( $3 ? $3 : 0 ) : 0; } |
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expr ARITH_BOR expr
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{ $$ = $1 | $3; } |
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expr ARITH_BXOR expr
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{ $$ = $1 ^ $3; } |
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expr ARITH_BAND expr
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{ $$ = $1 & $3; } |
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expr ARITH_EQ expr
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{ $$ = $1 == $3; } |
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expr ARITH_GT expr
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{ $$ = $1 > $3; } |
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expr ARITH_GE expr
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{ $$ = $1 >= $3; } |
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expr ARITH_LT expr
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{ $$ = $1 < $3; } |
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expr ARITH_LE expr
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{ $$ = $1 <= $3; } |
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expr ARITH_NE expr
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{ $$ = $1 != $3; } |
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expr ARITH_LSHIFT expr
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{ $$ = $1 << $3; } |
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expr ARITH_RSHIFT expr
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{ $$ = $1 >> $3; } |
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expr ARITH_ADD expr
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{ $$ = $1 + $3; } |
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expr ARITH_SUB expr
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{ $$ = $1 - $3; } |
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expr ARITH_MUL expr
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{ $$ = $1 * $3; } |
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expr ARITH_DIV expr
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{
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if ($3 == 0)
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yyerror("division by zero");
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$$ = $1 / $3;
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} |
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expr ARITH_REM expr
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{
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if ($3 == 0)
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yyerror("division by zero");
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$$ = $1 % $3;
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} |
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ARITH_NOT expr
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{ $$ = !($2); } |
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ARITH_BNOT expr
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{ $$ = ~($2); } |
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ARITH_SUB expr %prec ARITH_UNARYMINUS
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{ $$ = -($2); } |
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ARITH_ADD expr %prec ARITH_UNARYPLUS
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{ $$ = $2; } |
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ARITH_NUM |
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ARITH_VAR
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{
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char *p;
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arith_t arith_val;
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char *str_val;
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if (lookupvar($1) == NULL)
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setvarsafe($1, "0", 0);
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str_val = lookupvar($1);
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arith_val = strtoarith_t(str_val, &p, 0);
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/*
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* Conversion is successful only in case
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* we've converted _all_ characters.
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*/
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if (*p != '\0')
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yyerror("variable conversion error");
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$$ = arith_val;
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} |
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ARITH_VAR ARITH_ASSIGN expr
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{
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if (arith_assign($1, $3) != 0)
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yyerror("variable assignment error");
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$$ = $3;
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} |
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ARITH_VAR ARITH_ADDASSIGN expr
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{
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arith_t value;
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value = atoarith_t(lookupvar($1)) + $3;
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if (arith_assign($1, value) != 0)
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yyerror("variable assignment error");
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$$ = value;
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} |
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ARITH_VAR ARITH_SUBASSIGN expr
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{
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arith_t value;
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value = atoarith_t(lookupvar($1)) - $3;
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if (arith_assign($1, value) != 0)
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yyerror("variable assignment error");
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$$ = value;
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} |
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ARITH_VAR ARITH_MULASSIGN expr
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{
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arith_t value;
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value = atoarith_t(lookupvar($1)) * $3;
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if (arith_assign($1, value) != 0)
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yyerror("variable assignment error");
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$$ = value;
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} |
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ARITH_VAR ARITH_DIVASSIGN expr
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{
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arith_t value;
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if ($3 == 0)
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yyerror("division by zero");
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value = atoarith_t(lookupvar($1)) / $3;
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if (arith_assign($1, value) != 0)
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yyerror("variable assignment error");
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$$ = value;
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} |
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ARITH_VAR ARITH_REMASSIGN expr
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{
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arith_t value;
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if ($3 == 0)
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yyerror("division by zero");
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value = atoarith_t(lookupvar($1)) % $3;
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if (arith_assign($1, value) != 0)
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yyerror("variable assignment error");
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$$ = value;
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} |
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ARITH_VAR ARITH_RSHASSIGN expr
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{
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arith_t value;
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value = atoarith_t(lookupvar($1)) >> $3;
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if (arith_assign($1, value) != 0)
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yyerror("variable assignment error");
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$$ = value;
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} |
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ARITH_VAR ARITH_LSHASSIGN expr
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{
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arith_t value;
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value = atoarith_t(lookupvar($1)) << $3;
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if (arith_assign($1, value) != 0)
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yyerror("variable assignment error");
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$$ = value;
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} |
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ARITH_VAR ARITH_BANDASSIGN expr
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{
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arith_t value;
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value = atoarith_t(lookupvar($1)) & $3;
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if (arith_assign($1, value) != 0)
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yyerror("variable assignment error");
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$$ = value;
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} |
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ARITH_VAR ARITH_BXORASSIGN expr
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{
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arith_t value;
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value = atoarith_t(lookupvar($1)) ^ $3;
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if (arith_assign($1, value) != 0)
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yyerror("variable assignment error");
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$$ = value;
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} |
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ARITH_VAR ARITH_BORASSIGN expr
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{
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arith_t value;
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value = atoarith_t(lookupvar($1)) | $3;
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if (arith_assign($1, value) != 0)
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yyerror("variable assignment error");
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$$ = value;
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} ;
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%%
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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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#include "builtins.h"
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#define lstrlen(var) (3 + (2 + CHAR_BIT * sizeof((var))) / 3)
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char *arith_buf, *arith_startbuf;
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int yylex(void);
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int yyparse(void);
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int
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arith_assign(char *name, arith_t value)
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{
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char *str;
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int ret;
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str = (char *)ckmalloc(lstrlen(value));
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sprintf(str, ARITH_FORMAT_STR, value);
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ret = setvarsafe(name, str, 0);
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free(str);
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return ret;
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}
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int
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arith(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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void
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yyerror(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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}
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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(int argc, 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("%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(int argc, 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(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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/*
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* $PchId: arith.y,v 1.6 2006/05/22 12:41:47 philip Exp $
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*/
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