usr/dash/arith.y

%{
/*-
 * Copyright (c) 1993
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1997-2005
 *	Herbert Xu <herbert@gondor.apana.org.au>.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Kenneth Almquist.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <stdlib.h>
#include "expand.h"
#include "shell.h"
#include "error.h"
#include "output.h"
#include "memalloc.h"

const char *arith_buf, *arith_startbuf;

#ifndef YYBISON
int yyparse(void);
#endif
void yyerror(const char *);
#ifdef TESTARITH
int main(int , char *[]);
int sh_error(char *);
#endif

%}
%token ARITH_NUM ARITH_LPAREN ARITH_RPAREN

%left ARITH_OR
%left ARITH_AND
%left ARITH_BOR
%left ARITH_BXOR
%left ARITH_BAND
%left ARITH_EQ ARITH_NE
%left ARITH_LT ARITH_GT ARITH_GE ARITH_LE
%left ARITH_LSHIFT ARITH_RSHIFT
%left ARITH_ADD ARITH_SUB
%left ARITH_MUL ARITH_DIV ARITH_REM
%left ARITH_UNARYMINUS ARITH_UNARYPLUS ARITH_NOT ARITH_BNOT
%%

exp:	expr {
			return ($1);
	}
	;


expr:	ARITH_LPAREN expr ARITH_RPAREN { $$ = $2; }
	| expr ARITH_OR expr	{ $$ = $1 || $3; }
	| expr ARITH_AND expr	{ $$ = $1 && $3; }
	| expr ARITH_BOR expr	{ $$ = $1 | $3; }
	| expr ARITH_BXOR expr	{ $$ = $1 ^ $3; }
	| expr ARITH_BAND expr	{ $$ = $1 & $3; }
	| expr ARITH_EQ expr	{ $$ = $1 == $3; }
	| expr ARITH_GT expr	{ $$ = $1 > $3; }
	| expr ARITH_GE expr	{ $$ = $1 >= $3; }
	| expr ARITH_LT expr	{ $$ = $1 < $3; }
	| expr ARITH_LE expr	{ $$ = $1 <= $3; }
	| expr ARITH_NE expr	{ $$ = $1 != $3; }
	| expr ARITH_LSHIFT expr { $$ = $1 << $3; }
	| expr ARITH_RSHIFT expr { $$ = $1 >> $3; }
	| expr ARITH_ADD expr	{ $$ = $1 + $3; }
	| expr ARITH_SUB expr	{ $$ = $1 - $3; }
	| expr ARITH_MUL expr	{ $$ = $1 * $3; }
	| expr ARITH_DIV expr	{
			if ($3 == 0)
				yyerror("division by zero");
			$$ = $1 / $3;
		}
	| expr ARITH_REM expr   {
			if ($3 == 0)
				yyerror("division by zero");
			$$ = $1 % $3;
		}
	| ARITH_NOT expr	{ $$ = !($2); }
	| ARITH_BNOT expr	{ $$ = ~($2); }
	| ARITH_SUB expr %prec ARITH_UNARYMINUS { $$ = -($2); }
	| ARITH_ADD expr %prec ARITH_UNARYPLUS { $$ = $2; }
	| ARITH_NUM
	;
%%
int
arith(s)
	const char *s;
{
	long result;

	arith_buf = arith_startbuf = s;

	INTOFF;
	result = yyparse();
	arith_lex_reset();	/* reprime lex */
	INTON;

	return (result);
}


/*************************/
#ifdef TEST_ARITH
#include <stdio.h>
main(argc, argv)
	char *argv[];
{
	printf("%d\n", exp(argv[1]));
}
sh_error(s)
	char *s;
{
	fprintf(stderr, "exp: %s\n", s);
	exit(1);
}
#endif

void
yyerror(s)
	const char *s;
{

#ifndef YYBISON
	yyerrok;
#endif
	yyclearin;
	arith_lex_reset();	/* reprime lex */
	sh_error("arithmetic expression: %s: \"%s\"", s, arith_startbuf);
	/* NOTREACHED */
}
1	%{
2	/*-
3	* Copyright (c) 1993
4	* The Regents of the University of California. All rights reserved.
5	* Copyright (c) 1997-2005
6	* Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved.
7	*
8	* This code is derived from software contributed to Berkeley by
9	* Kenneth Almquist.
10	*
11	* Redistribution and use in source and binary forms, with or without
12	* modification, are permitted provided that the following conditions
13	* are met:
14	* 1. Redistributions of source code must retain the above copyright
15	* notice, this list of conditions and the following disclaimer.
16	* 2. Redistributions in binary form must reproduce the above copyright
17	* notice, this list of conditions and the following disclaimer in the
18	* documentation and/or other materials provided with the distribution.
19	* 3. Neither the name of the University nor the names of its contributors
20	* may be used to endorse or promote products derived from this software
21	* without specific prior written permission.
22	*
23	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33	* SUCH DAMAGE.
34	*/
35
36	#include <stdlib.h>
37	#include "expand.h"
38	#include "shell.h"
39	#include "error.h"
40	#include "output.h"
41	#include "memalloc.h"
42
43	const char arith_buf, arith_startbuf;
44
45	#ifndef YYBISON
46	int yyparse(void);
47	#endif
48	void yyerror(const char *);
49	#ifdef TESTARITH
50	int main(int , char *[]);
51	int sh_error(char *);
52	#endif
53
54	%}
55	%token ARITH_NUM ARITH_LPAREN ARITH_RPAREN
56
57	%left ARITH_OR
58	%left ARITH_AND
59	%left ARITH_BOR
60	%left ARITH_BXOR
61	%left ARITH_BAND
62	%left ARITH_EQ ARITH_NE
63	%left ARITH_LT ARITH_GT ARITH_GE ARITH_LE
64	%left ARITH_LSHIFT ARITH_RSHIFT
65	%left ARITH_ADD ARITH_SUB
66	%left ARITH_MUL ARITH_DIV ARITH_REM
67	%left ARITH_UNARYMINUS ARITH_UNARYPLUS ARITH_NOT ARITH_BNOT
68	%%
69
70	exp: expr {
71	return ($1);
72	}
73	;
74
75
76	expr: ARITH_LPAREN expr ARITH_RPAREN { $$ = $2; }
77	\| expr ARITH_OR expr { $$ = $1 \|\| $3; }
78	\| expr ARITH_AND expr { $$ = $1 && $3; }
79	\| expr ARITH_BOR expr { $$ = $1 \| $3; }
80	\| expr ARITH_BXOR expr { $$ = $1 ^ $3; }
81	\| expr ARITH_BAND expr { $$ = $1 & $3; }
82	\| expr ARITH_EQ expr { $$ = $1 == $3; }
83	\| expr ARITH_GT expr { $$ = $1 > $3; }
84	\| expr ARITH_GE expr { $$ = $1 >= $3; }
85	\| expr ARITH_LT expr { $$ = $1 < $3; }
86	\| expr ARITH_LE expr { $$ = $1 <= $3; }
87	\| expr ARITH_NE expr { $$ = $1 != $3; }
88	\| expr ARITH_LSHIFT expr { $$ = $1 << $3; }
89	\| expr ARITH_RSHIFT expr { $$ = $1 >> $3; }
90	\| expr ARITH_ADD expr { $$ = $1 + $3; }
91	\| expr ARITH_SUB expr { $$ = $1 - $3; }
92	\| expr ARITH_MUL expr { $$ = $1 * $3; }
93	\| expr ARITH_DIV expr {
94	if ($3 == 0)
95	yyerror("division by zero");
96	$$ = $1 / $3;
97	}
98	\| expr ARITH_REM expr {
99	if ($3 == 0)
100	yyerror("division by zero");
101	$$ = $1 % $3;
102	}
103	\| ARITH_NOT expr { $$ = !($2); }
104	\| ARITH_BNOT expr { $$ = ~($2); }
105	\| ARITH_SUB expr %prec ARITH_UNARYMINUS { $$ = -($2); }
106	\| ARITH_ADD expr %prec ARITH_UNARYPLUS { $$ = $2; }
107	\| ARITH_NUM
108	;
109	%%
110	int
111	arith(s)
112	const char *s;
113	{
114	long result;
115
116	arith_buf = arith_startbuf = s;
117
118	INTOFF;
119	result = yyparse();
120	arith_lex_reset(); /* reprime lex */
121	INTON;
122
123	return (result);
124	}
125
126
127	/*************************/
128	#ifdef TEST_ARITH
129	#include <stdio.h>
130	main(argc, argv)
131	char *argv[];
132	{
133	printf("%d\n", exp(argv[1]));
134	}
135	sh_error(s)
136	char *s;
137	{
138	fprintf(stderr, "exp: %s\n", s);
139	exit(1);
140	}
141	#endif
142
143	void
144	yyerror(s)
145	const char *s;
146	{
147
148	#ifndef YYBISON
149	yyerrok;
150	#endif
151	yyclearin;
152	arith_lex_reset(); /* reprime lex */
153	sh_error("arithmetic expression: %s: \"%s\"", s, arith_startbuf);
154	/* NOTREACHED */
155	}