Implement missing shell arithmetic operators in $(()) expansion
and variable recognition. PR: standards/52972 Submitted by: Wartan Hachaturow <wart@tepkom.ru> Reviewed by: tjr (improved on original patch) Tested by: buildworld on CURRENT. MFC after: 6 weeks
This commit is contained in:
Jens Schweikhardt
parent
9cd8ed99ee
commit
bc411549ba
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=119578
@ -34,5 +34,6 @@
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* $FreeBSD$
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*/
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int arith_assign(char *, arith_t);
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int arith(char *);
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int expcmd(int , char **);
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246
bin/sh/arith.y
246
bin/sh/arith.y
@ -1,58 +1,4 @@
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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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%{
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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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@ -97,17 +43,207 @@ static char sccsid[] = "@(#)arith.y 8.3 (Berkeley) 5/4/95";
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <limits.h>
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#include "shell.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: 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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| ARITH_VAR {
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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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$$ = arith_val;
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}
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| ARITH_VAR ARITH_ASSIGN expr {
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if (arith_assign($1, $3) != 1)
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yyerror("variable assignment error");
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$$ = $3;
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}
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| ARITH_VAR ARITH_ADDASSIGN expr {
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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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$$ = value;
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}
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| ARITH_VAR ARITH_SUBASSIGN expr {
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arith_t value;
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value = atoarith_t(lookupvar($1)) - $3;
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if (arith_assign($1, value) != 0)
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yyerror("variable assignment error");
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$$ = value;
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}
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| ARITH_VAR ARITH_MULASSIGN expr {
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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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$$ = value;
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}
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| ARITH_VAR ARITH_DIVASSIGN expr {
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arith_t value;
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if ($3 == 0)
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yyerror("division by zero");
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value = atoarith_t(lookupvar($1)) / $3;
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if (arith_assign($1, value) != 0)
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yyerror("variable assignment error");
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$$ = value;
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}
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| ARITH_VAR ARITH_REMASSIGN expr {
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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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$$ = value;
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}
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| ARITH_VAR ARITH_RSHASSIGN expr {
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arith_t value;
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value = atoarith_t(lookupvar($1)) >> $3;
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if (arith_assign($1, value) != 0)
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yyerror("variable assignment error");
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$$ = value;
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}
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| ARITH_VAR ARITH_LSHASSIGN expr {
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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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$$ = value;
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}
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| ARITH_VAR ARITH_BANDASSIGN expr {
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arith_t value;
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value = atoarith_t(lookupvar($1)) & $3;
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if (arith_assign($1, value) != 0)
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yyerror("variable assignment error");
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$$ = value;
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}
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| ARITH_VAR ARITH_BXORASSIGN expr {
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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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$$ = value;
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}
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| ARITH_VAR ARITH_BORASSIGN expr {
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arith_t value;
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value = atoarith_t(lookupvar($1)) | $3;
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if (arith_assign($1, value) != 0)
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yyerror("variable assignment error");
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$$ = value;
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}
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;
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%%
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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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#define lstrlen(var) (3 + (2 + CHAR_BIT * sizeof((var))) / 3)
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char *arith_buf, *arith_startbuf;
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extern void arith_lex_reset();
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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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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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@ -43,10 +43,12 @@ static char sccsid[] = "@(#)arith_lex.l 8.3 (Berkeley) 5/4/95";
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "shell.h"
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#include "y.tab.h"
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#include "error.h"
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#include "var.h"
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#include "memalloc.h"
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extern int yylval;
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extern char *arith_buf, *arith_startbuf;
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#undef YY_INPUT
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#define YY_INPUT(buf,result,max) \
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@ -56,7 +58,36 @@ extern char *arith_buf, *arith_startbuf;
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%%
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[ \t\n] { ; }
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[0-9]+ { yylval = atol(yytext); return(ARITH_NUM); }
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0x[a-fA-F0-9]+ {
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yylval.l_value = strtoarith_t(yytext, NULL, 16);
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return(ARITH_NUM);
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}
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0[0-7]+ {
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yylval.l_value = strtoarith_t(yytext, NULL, 8);
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return(ARITH_NUM);
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}
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[0-9]+ {
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yylval.l_value = strtoarith_t(yytext, NULL, 10);
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return(ARITH_NUM);
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}
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[A-Za-z][A-Za-z0-9_]* {
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/*
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* If variable doesn't exist, we should initialize
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* it to zero.
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*/
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char *temp;
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if (lookupvar(yytext) == NULL)
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setvarsafe(yytext, "0", 0);
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temp = (char *)ckmalloc(strlen(yytext) + 1);
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yylval.s_value = strcpy(temp, yytext);
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return(ARITH_VAR);
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}
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"(" { return(ARITH_LPAREN); }
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")" { return(ARITH_RPAREN); }
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"||" { return(ARITH_OR); }
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@ -79,6 +110,17 @@ extern char *arith_buf, *arith_startbuf;
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"-" { return(ARITH_SUB); }
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"~" { return(ARITH_BNOT); }
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"!" { return(ARITH_NOT); }
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"=" { return(ARITH_ASSIGN); }
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"+=" { return(ARITH_ADDASSIGN); }
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"-=" { return(ARITH_SUBASSIGN); }
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"*=" { return(ARITH_MULASSIGN); }
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"/=" { return(ARITH_DIVASSIGN); }
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"%=" { return(ARITH_REMASSIGN); }
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">>=" { return(ARITH_RSHASSIGN); }
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"<<=" { return(ARITH_LSHASSIGN); }
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"&=" { return(ARITH_BANDASSIGN); }
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"^=" { return(ARITH_BXORASSIGN); }
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"|=" { return(ARITH_BORASSIGN); }
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. { error("arith: syntax error: \"%s\"\n", arith_startbuf); }
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%%
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@ -51,6 +51,14 @@
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#define JOBS 1
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/* #define DEBUG 1 */
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/*
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* Type of used arithmetics. SUSv3 requires us to have at least signed long.
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*/
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typedef long arith_t;
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#define strtoarith_t(nptr, endptr, base) strtol(nptr, endptr, base)
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#define atoarith_t(arg) strtol(arg, NULL, 0)
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#define ARITH_FORMAT_STR "%ld"
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typedef void *pointer;
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#define STATIC static
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#define MKINIT /* empty */
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