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freebsd/bin/sh/arith.y
2005-08-13 07:54:23 +00:00

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%{
/*-
* Copyright (c) 1993
* The Regents of the University of California. 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.
* 4. 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.
*/
#if 0
#ifndef lint
static char sccsid[] = "@(#)arith.y 8.3 (Berkeley) 5/4/95";
#endif
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <limits.h>
#include <stdio.h>
#include "arith.h"
#include "shell.h"
#include "var.h"
%}
%union {
arith_t l_value;
char* s_value;
}
%token <l_value> ARITH_NUM ARITH_LPAREN ARITH_RPAREN
%token <s_value> ARITH_VAR
%type <l_value> expr
%right ARITH_ASSIGN
%right ARITH_ADDASSIGN ARITH_SUBASSIGN
%right ARITH_MULASSIGN ARITH_DIVASSIGN ARITH_REMASSIGN
%right ARITH_RSHASSIGN ARITH_LSHASSIGN
%right ARITH_BANDASSIGN ARITH_BXORASSIGN ARITH_BORASSIGN
%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 ? $1 : $3 ? $3 : 0; } |
expr ARITH_AND expr
{ $$ = $1 ? ( $3 ? $3 : 0 ) : 0; } |
expr ARITH_BOR expr
{ $$ = $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
{ $$ = $2; } |
ARITH_NUM |
ARITH_VAR
{
char *p;
arith_t arith_val;
char *str_val;
if (lookupvar($1) == NULL)
setvarsafe($1, "0", 0);
str_val = lookupvar($1);
arith_val = strtoarith_t(str_val, &p, 0);
/*
* Conversion is successful only in case
* we've converted _all_ characters.
*/
if (*p != '\0')
yyerror("variable conversion error");
$$ = arith_val;
} |
ARITH_VAR ARITH_ASSIGN expr
{
if (arith_assign($1, $3) != 0)
yyerror("variable assignment error");
$$ = $3;
} |
ARITH_VAR ARITH_ADDASSIGN expr
{
arith_t value;
value = atoarith_t(lookupvar($1)) + $3;
if (arith_assign($1, value) != 0)
yyerror("variable assignment error");
$$ = value;
} |
ARITH_VAR ARITH_SUBASSIGN expr
{
arith_t value;
value = atoarith_t(lookupvar($1)) - $3;
if (arith_assign($1, value) != 0)
yyerror("variable assignment error");
$$ = value;
} |
ARITH_VAR ARITH_MULASSIGN expr
{
arith_t value;
value = atoarith_t(lookupvar($1)) * $3;
if (arith_assign($1, value) != 0)
yyerror("variable assignment error");
$$ = value;
} |
ARITH_VAR ARITH_DIVASSIGN expr
{
arith_t value;
if ($3 == 0)
yyerror("division by zero");
value = atoarith_t(lookupvar($1)) / $3;
if (arith_assign($1, value) != 0)
yyerror("variable assignment error");
$$ = value;
} |
ARITH_VAR ARITH_REMASSIGN expr
{
arith_t value;
if ($3 == 0)
yyerror("division by zero");
value = atoarith_t(lookupvar($1)) % $3;
if (arith_assign($1, value) != 0)
yyerror("variable assignment error");
$$ = value;
} |
ARITH_VAR ARITH_RSHASSIGN expr
{
arith_t value;
value = atoarith_t(lookupvar($1)) >> $3;
if (arith_assign($1, value) != 0)
yyerror("variable assignment error");
$$ = value;
} |
ARITH_VAR ARITH_LSHASSIGN expr
{
arith_t value;
value = atoarith_t(lookupvar($1)) << $3;
if (arith_assign($1, value) != 0)
yyerror("variable assignment error");
$$ = value;
} |
ARITH_VAR ARITH_BANDASSIGN expr
{
arith_t value;
value = atoarith_t(lookupvar($1)) & $3;
if (arith_assign($1, value) != 0)
yyerror("variable assignment error");
$$ = value;
} |
ARITH_VAR ARITH_BXORASSIGN expr
{
arith_t value;
value = atoarith_t(lookupvar($1)) ^ $3;
if (arith_assign($1, value) != 0)
yyerror("variable assignment error");
$$ = value;
} |
ARITH_VAR ARITH_BORASSIGN expr
{
arith_t value;
value = atoarith_t(lookupvar($1)) | $3;
if (arith_assign($1, value) != 0)
yyerror("variable assignment error");
$$ = value;
} ;
%%
#include "error.h"
#include "output.h"
#include "memalloc.h"
#define lstrlen(var) (3 + (2 + CHAR_BIT * sizeof((var))) / 3)
char *arith_buf, *arith_startbuf;
int yylex(void);
int yyparse(void);
static int
arith_assign(char *name, arith_t value)
{
char *str;
int ret;
str = (char *)ckmalloc(lstrlen(value));
sprintf(str, ARITH_FORMAT_STR, value);
ret = setvarsafe(name, str, 0);
free(str);
return ret;
}
int
arith(char *s)
{
long result;
arith_buf = arith_startbuf = s;
INTOFF;
result = yyparse();
arith_lex_reset(); /* Reprime lex. */
INTON;
return result;
}
static void
yyerror(char *s)
{
yyerrok;
yyclearin;
arith_lex_reset(); /* Reprime lex. */
error("arithmetic expression: %s: \"%s\"", s, arith_startbuf);
}
/*
* The exp(1) builtin.
*/
int
expcmd(int argc, char **argv)
{
char *p;
char *concat;
char **ap;
long i;
if (argc > 1) {
p = argv[1];
if (argc > 2) {
/*
* Concatenate arguments.
*/
STARTSTACKSTR(concat);
ap = argv + 2;
for (;;) {
while (*p)
STPUTC(*p++, concat);
if ((p = *ap++) == NULL)
break;
STPUTC(' ', concat);
}
STPUTC('\0', concat);
p = grabstackstr(concat);
}
} else
p = "";
i = arith(p);
out1fmt("%ld\n", i);
return !i;
}
/*************************/
#ifdef TEST_ARITH
#include <stdio.h>
main(int argc, char *argv[])
{
printf("%d\n", exp(argv[1]));
}
error(char *s)
{
fprintf(stderr, "exp: %s\n", s);
exit(1);
}
#endif