/* expr.c -- arithmetic expression evaluation. */
-/* Copyright (C) 1990, 1991 Free Software Foundation, Inc.
+/* Copyright (C) 1990-2015 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
- Bash is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
+ Bash is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
- Bash is distributed in the hope that it will be useful, but WITHOUT
- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
- License for more details.
+ Bash is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with Bash; see the file COPYING. If not, write to the Free
- Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
+ along with Bash. If not, see <http://www.gnu.org/licenses/>.
+*/
/*
- All arithmetic is done as long integers with no checking for overflow
+ All arithmetic is done as intmax_t integers with no checking for overflow
(though division by 0 is caught and flagged as an error).
The following operators are handled, grouped into a set of levels in
"||"
"expr ? expr : expr"
"=", "*=", "/=", "%=", "+=", "-=", "<<=", ">>=", "&=", "^=", "|="
+ , [comma]
(Note that most of these operators have special meaning to bash, and an
entire expression should be quoted, e.g. "a=$a+1" or "a=a+1" to ensure
Implementation is a recursive-descent parser.
Chet Ramey
- chet@ins.CWRU.Edu
+ chet@po.cwru.edu
*/
#include "config.h"
# include <unistd.h>
#endif
-#include <ctype.h>
+#include "chartypes.h"
+#include "bashintl.h"
#include "shell.h"
+#include "typemax.h" /* INTMAX_MAX, INTMAX_MIN */
/* Because of the $((...)) construct, expressions may include newlines.
Here is a macro which accepts newlines, tabs and spaces as whitespace. */
#define cr_whitespace(c) (whitespace(c) || ((c) == '\n'))
-/* Size be which the expression stack grows when neccessary. */
+/* Size be which the expression stack grows when necessary. */
#define EXPR_STACK_GROW_SIZE 10
/* Maximum amount of recursion allowed. This prevents a non-integer
highest precedence. */
#define EXP_HIGHEST expcomma
+#ifndef MAX_INT_LEN
+# define MAX_INT_LEN 32
+#endif
+
+struct lvalue
+{
+ char *tokstr; /* possibly-rewritten lvalue if not NULL */
+ intmax_t tokval; /* expression evaluated value */
+ SHELL_VAR *tokvar; /* variable described by array or var reference */
+ intmax_t ind; /* array index if not -1 */
+};
+
+/* A structure defining a single expression context. */
+typedef struct {
+ int curtok, lasttok;
+ char *expression, *tp, *lasttp;
+ intmax_t tokval;
+ char *tokstr;
+ int noeval;
+ struct lvalue lval;
+} EXPR_CONTEXT;
+
static char *expression; /* The current expression */
static char *tp; /* token lexical position */
static char *lasttp; /* pointer to last token position */
static int lasttok; /* the previous token */
static int assigntok; /* the OP in OP= */
static char *tokstr; /* current token string */
-static int tokval; /* current token value */
+static intmax_t tokval; /* current token value */
static int noeval; /* set to 1 if no assignment to be done */
static procenv_t evalbuf;
-static void readtok (); /* lexical analyzer */
-static long subexpr (), expassign (), exp0 (), exp1 (), exp2 (), exp3 (),
- exp4 (), exp5 (), expshift (), expland (), explor (),
- expband (), expbor (), expbxor (), expcond (), exppower (),
- expcomma ();
-static long strlong ();
-static void evalerror ();
+static struct lvalue curlval = {0, 0, 0, -1};
+static struct lvalue lastlval = {0, 0, 0, -1};
-/* A structure defining a single expression context. */
-typedef struct {
- int curtok, lasttok;
- char *expression, *tp, *lasttp;
- int tokval;
- char *tokstr;
- int noeval;
-} EXPR_CONTEXT;
+static int _is_arithop __P((int));
+static void readtok __P((void)); /* lexical analyzer */
-typedef struct {
- char *tokstr;
- int tokval;
-} LVALUE;
+static void init_lvalue __P((struct lvalue *));
+static struct lvalue *alloc_lvalue __P((void));
+static void free_lvalue __P((struct lvalue *));
+
+static intmax_t expr_streval __P((char *, int, struct lvalue *));
+static intmax_t strlong __P((char *));
+static void evalerror __P((const char *));
+
+static void pushexp __P((void));
+static void popexp __P((void));
+static void expr_unwind __P((void));
+static void expr_bind_variable __P((char *, char *));
+#if defined (ARRAY_VARS)
+static void expr_bind_array_element __P((char *, arrayind_t, char *));
+#endif
+
+static intmax_t subexpr __P((char *));
+
+static intmax_t expcomma __P((void));
+static intmax_t expassign __P((void));
+static intmax_t expcond __P((void));
+static intmax_t explor __P((void));
+static intmax_t expland __P((void));
+static intmax_t expbor __P((void));
+static intmax_t expbxor __P((void));
+static intmax_t expband __P((void));
+static intmax_t exp5 __P((void));
+static intmax_t exp4 __P((void));
+static intmax_t expshift __P((void));
+static intmax_t exp3 __P((void));
+static intmax_t exp2 __P((void));
+static intmax_t exppower __P((void));
+static intmax_t exp1 __P((void));
+static intmax_t exp0 __P((void));
/* Global var which contains the stack of expression contexts. */
static EXPR_CONTEXT **expr_stack;
static int expr_stack_size; /* Number of slots already allocated. */
extern char *this_command_name;
+extern int unbound_vars_is_error, last_command_exit_value;
+
+#if defined (ARRAY_VARS)
+extern const char * const bash_badsub_errmsg;
+#endif
#define SAVETOK(X) \
do { \
(X)->tokval = tokval; \
(X)->tokstr = tokstr; \
(X)->noeval = noeval; \
+ (X)->lval = curlval; \
} while (0)
#define RESTORETOK(X) \
tokval = (X)->tokval; \
tokstr = (X)->tokstr; \
noeval = (X)->noeval; \
+ curlval = (X)->lval; \
} while (0)
/* Push and save away the contents of the globals describing the
EXPR_CONTEXT *context;
if (expr_depth >= MAX_EXPR_RECURSION_LEVEL)
- evalerror ("expression recursion level exceeded");
+ evalerror (_("expression recursion level exceeded"));
if (expr_depth >= expr_stack_size)
{
- expr_stack = (EXPR_CONTEXT **)
- xrealloc (expr_stack, (expr_stack_size += EXPR_STACK_GROW_SIZE)
- * sizeof (EXPR_CONTEXT *));
+ expr_stack_size += EXPR_STACK_GROW_SIZE;
+ expr_stack = (EXPR_CONTEXT **)xrealloc (expr_stack, expr_stack_size * sizeof (EXPR_CONTEXT *));
}
context = (EXPR_CONTEXT *)xmalloc (sizeof (EXPR_CONTEXT));
EXPR_CONTEXT *context;
if (expr_depth == 0)
- evalerror ("recursion stack underflow");
+ evalerror (_("recursion stack underflow"));
context = expr_stack[--expr_depth];
free (context);
}
+static void
+expr_unwind ()
+{
+ while (--expr_depth > 0)
+ {
+ if (expr_stack[expr_depth]->tokstr)
+ free (expr_stack[expr_depth]->tokstr);
+
+ if (expr_stack[expr_depth]->expression)
+ free (expr_stack[expr_depth]->expression);
+
+ free (expr_stack[expr_depth]);
+ }
+ free (expr_stack[expr_depth]); /* free the allocated EXPR_CONTEXT */
+
+ noeval = 0; /* XXX */
+}
+
+static void
+expr_bind_variable (lhs, rhs)
+ char *lhs, *rhs;
+{
+ SHELL_VAR *v;
+
+ v = bind_int_variable (lhs, rhs);
+ if (v && (readonly_p (v) || noassign_p (v)))
+ sh_longjmp (evalbuf, 1); /* variable assignment error */
+ stupidly_hack_special_variables (lhs);
+}
+
+#if defined (ARRAY_VARS)
+/* Rewrite tok, which is of the form vname[expression], to vname[ind], where
+ IND is the already-calculated value of expression. */
+static void
+expr_bind_array_element (tok, ind, rhs)
+ char *tok;
+ arrayind_t ind;
+ char *rhs;
+{
+ char *lhs, *vname;
+ size_t llen;
+ char ibuf[INT_STRLEN_BOUND (arrayind_t) + 1], *istr;
+
+ istr = fmtumax (ind, 10, ibuf, sizeof (ibuf), 0);
+ vname = array_variable_name (tok, (char **)NULL, (int *)NULL);
+
+ llen = strlen (vname) + sizeof (ibuf) + 3;
+ lhs = xmalloc (llen);
+
+ sprintf (lhs, "%s[%s]", vname, istr); /* XXX */
+
+/*itrace("expr_bind_array_element: %s=%s", lhs, rhs);*/
+ expr_bind_variable (lhs, rhs);
+ free (vname);
+ free (lhs);
+}
+#endif /* ARRAY_VARS */
+
/* Evaluate EXPR, and return the arithmetic result. If VALIDP is
non-null, a zero is stored into the location to which it points
if the expression is invalid, non-zero otherwise. If a non-zero
were assigned at program startup or by the compiler. Therefore, it is
safe to let the loop terminate when expr_depth == 0, without freeing up
any of the expr_depth[0] stuff. */
-long
+intmax_t
evalexp (expr, validp)
char *expr;
int *validp;
{
- long val;
-#if 0
- procenv_t old_evalbuf;
-#endif
+ intmax_t val;
+ int c;
+ procenv_t oevalbuf;
- val = 0L;
+ val = 0;
+ noeval = 0;
-#if 0
- /* Save the value of evalbuf to protect it around possible recursive
- calls to evalexp (). */
- COPY_PROCENV (evalbuf, old_evalbuf);
-#endif
+ FASTCOPY (evalbuf, oevalbuf, sizeof (evalbuf));
+
+ c = setjmp_nosigs (evalbuf);
- if (setjmp (evalbuf))
+ if (c)
{
FREE (tokstr);
FREE (expression);
tokstr = expression = (char *)NULL;
- while (--expr_depth > 0)
- {
- if (expr_stack[expr_depth]->tokstr)
- free (expr_stack[expr_depth]->tokstr);
-
- if (expr_stack[expr_depth]->expression)
- free (expr_stack[expr_depth]->expression);
-
- free (expr_stack[expr_depth]);
- }
- free (expr_stack[expr_depth]); /* free the allocated EXPR_CONTEXT */
+ expr_unwind ();
if (validp)
*validp = 0;
- return (0L);
+ return (0);
}
val = subexpr (expr);
-#if 0
- /* Restore the value of evalbuf so that any subsequent longjmp calls
- will have a valid location to jump to. */
- COPY_PROCENV (old_evalbuf, evalbuf);
-#endif
-
if (validp)
*validp = 1;
+ FASTCOPY (oevalbuf, evalbuf, sizeof (evalbuf));
+
return (val);
}
-static long
+static intmax_t
subexpr (expr)
char *expr;
{
- long val;
+ intmax_t val;
char *p;
for (p = expr; p && *p && cr_whitespace (*p); p++)
;
if (p == NULL || *p == '\0')
- return (0L);
+ return (0);
pushexp ();
- curtok = lasttok = 0;
expression = savestring (expr);
tp = expression;
+ curtok = lasttok = 0;
tokstr = (char *)NULL;
- tokval = 0L;
+ tokval = 0;
+ init_lvalue (&curlval);
+ lastlval = curlval;
readtok ();
val = EXP_HIGHEST ();
if (curtok != 0)
- evalerror ("syntax error in expression");
+ evalerror (_("syntax error in expression"));
FREE (tokstr);
FREE (expression);
return val;
}
-static long
+static intmax_t
expcomma ()
{
- register long value;
+ register intmax_t value;
value = expassign ();
while (curtok == COMMA)
return value;
}
-static long
+static intmax_t
expassign ()
{
- register long value;
+ register intmax_t value;
char *lhs, *rhs;
+ arrayind_t lind;
+#if defined (HAVE_IMAXDIV)
+ imaxdiv_t idiv;
+#endif
value = expcond ();
if (curtok == EQ || curtok == OP_ASSIGN)
{
int special, op;
- long lvalue;
+ intmax_t lvalue;
special = curtok == OP_ASSIGN;
if (lasttok != STR)
- evalerror ("attempted assignment to non-variable");
+ evalerror (_("attempted assignment to non-variable"));
if (special)
{
lvalue = value;
}
+ /* XXX - watch out for pointer aliasing issues here */
lhs = savestring (tokstr);
+ /* save ind in case rhs is string var and evaluation overwrites it */
+ lind = curlval.ind;
readtok ();
value = expassign ();
if (special)
{
+ if ((op == DIV || op == MOD) && value == 0)
+ {
+ if (noeval == 0)
+ evalerror (_("division by 0"));
+ else
+ value = 1;
+ }
+
switch (op)
{
case MUL:
lvalue *= value;
break;
case DIV:
- lvalue /= value;
- break;
case MOD:
- lvalue %= value;
+ if (lvalue == INTMAX_MIN && value == -1)
+ lvalue = (op == DIV) ? INTMAX_MIN : 0;
+ else
+#if HAVE_IMAXDIV
+ {
+ idiv = imaxdiv (lvalue, value);
+ lvalue = (op == DIV) ? idiv.quot : idiv.rem;
+ }
+#else
+ lvalue = (op == DIV) ? lvalue / value : lvalue % value;
+#endif
break;
case PLUS:
lvalue += value;
case BOR:
lvalue |= value;
break;
+ case BXOR:
+ lvalue ^= value;
+ break;
default:
free (lhs);
- evalerror ("bug: bad expassign token");
+ evalerror (_("bug: bad expassign token"));
break;
}
value = lvalue;
rhs = itos (value);
if (noeval == 0)
- (void)bind_int_variable (lhs, rhs);
+ {
+#if defined (ARRAY_VARS)
+ if (lind != -1)
+ expr_bind_array_element (lhs, lind, rhs);
+ else
+#endif
+ expr_bind_variable (lhs, rhs);
+ }
+ if (curlval.tokstr && curlval.tokstr == tokstr)
+ init_lvalue (&curlval);
+
free (rhs);
free (lhs);
FREE (tokstr);
tokstr = (char *)NULL; /* For freeing on errors. */
}
+
return (value);
}
/* Conditional expression (expr?expr:expr) */
-static long
+static intmax_t
expcond ()
{
- long cval, val1, val2, rval;
+ intmax_t cval, val1, val2, rval;
int set_noeval;
set_noeval = 0;
rval = cval = explor ();
if (curtok == QUES) /* found conditional expr */
{
- readtok ();
- if (curtok == 0 || curtok == COL)
- evalerror ("expression expected");
if (cval == 0)
{
set_noeval = 1;
noeval++;
}
-#if 0
- val1 = explor ();
-#else
+
+ readtok ();
+ if (curtok == 0 || curtok == COL)
+ evalerror (_("expression expected"));
+
val1 = EXP_HIGHEST ();
-#endif
+
if (set_noeval)
- noeval--;
+ noeval--;
if (curtok != COL)
- evalerror ("`:' expected for conditional expression");
- readtok ();
- if (curtok == 0)
- evalerror ("expression expected");
+ evalerror (_("`:' expected for conditional expression"));
+
set_noeval = 0;
if (cval)
{
set_noeval = 1;
noeval++;
}
- val2 = explor ();
+
+ readtok ();
+ if (curtok == 0)
+ evalerror (_("expression expected"));
+ val2 = expcond ();
+
if (set_noeval)
- noeval--;
+ noeval--;
rval = cval ? val1 : val2;
lasttok = COND;
}
}
/* Logical OR. */
-static long
+static intmax_t
explor ()
{
- register long val1, val2;
+ register intmax_t val1, val2;
int set_noeval;
val1 = expland ();
}
/* Logical AND. */
-static long
+static intmax_t
expland ()
{
- register long val1, val2;
+ register intmax_t val1, val2;
int set_noeval;
val1 = expbor ();
}
/* Bitwise OR. */
-static long
+static intmax_t
expbor ()
{
- register long val1, val2;
+ register intmax_t val1, val2;
val1 = expbxor ();
readtok ();
val2 = expbxor ();
val1 = val1 | val2;
+ lasttok = NUM;
}
return (val1);
}
/* Bitwise XOR. */
-static long
+static intmax_t
expbxor ()
{
- register long val1, val2;
+ register intmax_t val1, val2;
val1 = expband ();
readtok ();
val2 = expband ();
val1 = val1 ^ val2;
+ lasttok = NUM;
}
return (val1);
}
/* Bitwise AND. */
-static long
+static intmax_t
expband ()
{
- register long val1, val2;
+ register intmax_t val1, val2;
val1 = exp5 ();
readtok ();
val2 = exp5 ();
val1 = val1 & val2;
+ lasttok = NUM;
}
return (val1);
}
-static long
+static intmax_t
exp5 ()
{
- register long val1, val2;
+ register intmax_t val1, val2;
val1 = exp4 ();
val1 = (val1 == val2);
else if (op == NEQ)
val1 = (val1 != val2);
+ lasttok = NUM;
}
return (val1);
}
-static long
+static intmax_t
exp4 ()
{
- register long val1, val2;
+ register intmax_t val1, val2;
val1 = expshift ();
while ((curtok == LEQ) ||
val1 = val1 < val2;
else /* (op == GT) */
val1 = val1 > val2;
+ lasttok = NUM;
}
return (val1);
}
/* Left and right shifts. */
-static long
+static intmax_t
expshift ()
{
- register long val1, val2;
+ register intmax_t val1, val2;
val1 = exp3 ();
val1 = val1 << val2;
else
val1 = val1 >> val2;
+ lasttok = NUM;
}
return (val1);
}
-static long
+static intmax_t
exp3 ()
{
- register long val1, val2;
+ register intmax_t val1, val2;
val1 = exp2 ();
val1 += val2;
else if (op == MINUS)
val1 -= val2;
+ lasttok = NUM;
}
return (val1);
}
-static long
+static intmax_t
exp2 ()
{
- register long val1, val2;
+ register intmax_t val1, val2;
+#if defined (HAVE_IMAXDIV)
+ imaxdiv_t idiv;
+#endif
val1 = exppower ();
while ((curtok == MUL) ||
- (curtok == DIV) ||
- (curtok == MOD))
+ (curtok == DIV) ||
+ (curtok == MOD))
{
int op = curtok;
+ char *stp, *sltp;
+ stp = tp;
readtok ();
val2 = exppower ();
+ /* Handle division by 0 and twos-complement arithmetic overflow */
if (((op == DIV) || (op == MOD)) && (val2 == 0))
- evalerror ("division by 0");
+ {
+ if (noeval == 0)
+ {
+ sltp = lasttp;
+ lasttp = stp;
+ while (lasttp && *lasttp && whitespace (*lasttp))
+ lasttp++;
+ evalerror (_("division by 0"));
+ lasttp = sltp;
+ }
+ else
+ val2 = 1;
+ }
+ else if (op == MOD && val1 == INTMAX_MIN && val2 == -1)
+ {
+ val1 = 0;
+ continue;
+ }
+ else if (op == DIV && val1 == INTMAX_MIN && val2 == -1)
+ val2 = 1;
if (op == MUL)
- val1 *= val2;
- else if (op == DIV)
- val1 /= val2;
- else if (op == MOD)
- val1 %= val2;
+ val1 *= val2;
+ else if (op == DIV || op == MOD)
+#if defined (HAVE_IMAXDIV)
+ {
+ idiv = imaxdiv (val1, val2);
+ val1 = (op == DIV) ? idiv.quot : idiv.rem;
+ }
+#else
+ val1 = (op == DIV) ? val1 / val2 : val1 % val2;
+#endif
+ lasttok = NUM;
}
return (val1);
}
-static long
+static intmax_t
+ipow (base, exp)
+ intmax_t base, exp;
+{
+ intmax_t result;
+
+ result = 1;
+ while (exp)
+ {
+ if (exp & 1)
+ result *= base;
+ exp >>= 1;
+ base *= base;
+ }
+ return result;
+}
+
+static intmax_t
exppower ()
{
- register long val1, val2, c;
+ register intmax_t val1, val2, c;
val1 = exp1 ();
- if (curtok == POWER)
+ while (curtok == POWER)
{
readtok ();
- val2 = exp1 ();
+ val2 = exppower (); /* exponentiation is right-associative */
+ lasttok = NUM;
if (val2 == 0)
- return (1L);
+ return (1);
if (val2 < 0)
- evalerror ("exponent less than 0");
- for (c = 1; val2--; c *= val1)
- ;
- val1 = c;
+ evalerror (_("exponent less than 0"));
+ val1 = ipow (val1, val2);
}
return (val1);
}
-static long
+static intmax_t
exp1 ()
{
- register long val;
+ register intmax_t val;
if (curtok == NOT)
{
readtok ();
val = !exp1 ();
+ lasttok = NUM;
}
else if (curtok == BNOT)
{
readtok ();
val = ~exp1 ();
+ lasttok = NUM;
+ }
+ else if (curtok == MINUS)
+ {
+ readtok ();
+ val = - exp1 ();
+ lasttok = NUM;
+ }
+ else if (curtok == PLUS)
+ {
+ readtok ();
+ val = exp1 ();
+ lasttok = NUM;
}
else
val = exp0 ();
return (val);
}
-static long
+static intmax_t
exp0 ()
{
- register long val = 0L, v2;
+ register intmax_t val = 0, v2;
char *vincdec;
int stok;
+ EXPR_CONTEXT ec;
/* XXX - might need additional logic here to decide whether or not
pre-increment or pre-decrement is legal at this point. */
stok = lasttok = curtok;
readtok ();
if (curtok != STR)
- /* readtok() catches this */
- evalerror ("identifier expected after pre-increment or pre-decrement");
+ /* readtok() catches this */
+ evalerror (_("identifier expected after pre-increment or pre-decrement"));
v2 = tokval + ((stok == PREINC) ? 1 : -1);
vincdec = itos (v2);
if (noeval == 0)
- (void)bind_int_variable (tokstr, vincdec);
+ {
+#if defined (ARRAY_VARS)
+ if (curlval.ind != -1)
+ expr_bind_array_element (curlval.tokstr, curlval.ind, vincdec);
+ else
+#endif
+ expr_bind_variable (tokstr, vincdec);
+ }
free (vincdec);
val = v2;
curtok = NUM; /* make sure --x=7 is flagged as an error */
readtok ();
}
- else if (curtok == MINUS)
- {
- readtok ();
- val = - exp0 ();
- }
- else if (curtok == PLUS)
- {
- readtok ();
- val = exp0 ();
- }
else if (curtok == LPAR)
{
+ /* XXX - save curlval here? Or entire expression context? */
readtok ();
val = EXP_HIGHEST ();
- if (curtok != RPAR)
- evalerror ("missing `)'");
+ if (curtok != RPAR) /* ( */
+ evalerror (_("missing `)'"));
/* Skip over closing paren. */
readtok ();
else if ((curtok == NUM) || (curtok == STR))
{
val = tokval;
- if (curtok == STR && (*tp == '+' || *tp == '-') && tp[1] == *tp &&
- (tp[2] == '\0' || (isalnum (tp[2]) == 0)))
+ if (curtok == STR)
{
+ SAVETOK (&ec);
+ tokstr = (char *)NULL; /* keep it from being freed */
+ noeval = 1;
+ readtok ();
+ stok = curtok;
+
/* post-increment or post-decrement */
- v2 = val + ((*tp == '+') ? 1 : -1);
- vincdec = itos (v2);
- if (noeval == 0)
- (void)bind_int_variable (tokstr, vincdec);
- free (vincdec);
- tp += 2;
- curtok = NUM; /* make sure x++=7 is flagged as an error */
+ if (stok == POSTINC || stok == POSTDEC)
+ {
+ /* restore certain portions of EC */
+ tokstr = ec.tokstr;
+ noeval = ec.noeval;
+ curlval = ec.lval;
+ lasttok = STR; /* ec.curtok */
+
+ v2 = val + ((stok == POSTINC) ? 1 : -1);
+ vincdec = itos (v2);
+ if (noeval == 0)
+ {
+#if defined (ARRAY_VARS)
+ if (curlval.ind != -1)
+ expr_bind_array_element (curlval.tokstr, curlval.ind, vincdec);
+ else
+#endif
+ expr_bind_variable (tokstr, vincdec);
+ }
+ free (vincdec);
+ curtok = NUM; /* make sure x++=7 is flagged as an error */
+ }
+ else
+ {
+ /* XXX - watch out for pointer aliasing issues here */
+ if (stok == STR) /* free new tokstr before old one is restored */
+ FREE (tokstr);
+ RESTORETOK (&ec);
+ }
}
readtok ();
}
else
- evalerror ("syntax error: operand expected");
+ evalerror (_("syntax error: operand expected"));
return (val);
}
+static void
+init_lvalue (lv)
+ struct lvalue *lv;
+{
+ lv->tokstr = 0;
+ lv->tokvar = 0;
+ lv->tokval = lv->ind = -1;
+}
+
+static struct lvalue *
+alloc_lvalue ()
+{
+ struct lvalue *lv;
+
+ lv = xmalloc (sizeof (struct lvalue));
+ init_lvalue (lv);
+ return (lv);
+}
+
+static void
+free_lvalue (lv)
+ struct lvalue *lv;
+{
+ free (lv); /* should be inlined */
+}
+
+static intmax_t
+expr_streval (tok, e, lvalue)
+ char *tok;
+ int e;
+ struct lvalue *lvalue;
+{
+ SHELL_VAR *v;
+ char *value;
+ intmax_t tval;
+#if defined (ARRAY_VARS)
+ arrayind_t ind;
+#endif
+
+/*itrace("expr_streval: %s: noeval = %d", tok, noeval);*/
+ /* If we are suppressing evaluation, just short-circuit here instead of
+ going through the rest of the evaluator. */
+ if (noeval)
+ return (0);
+
+ /* [[[[[ */
+#if defined (ARRAY_VARS)
+ v = (e == ']') ? array_variable_part (tok, (char **)0, (int *)0) : find_variable (tok);
+#else
+ v = find_variable (tok);
+#endif
+
+ if ((v == 0 || invisible_p (v)) && unbound_vars_is_error)
+ {
+#if defined (ARRAY_VARS)
+ value = (e == ']') ? array_variable_name (tok, (char **)0, (int *)0) : tok;
+#else
+ value = tok;
+#endif
+
+ last_command_exit_value = EXECUTION_FAILURE;
+ err_unboundvar (value);
+
+#if defined (ARRAY_VARS)
+ if (e == ']')
+ FREE (value); /* array_variable_name returns new memory */
+#endif
+
+ if (no_longjmp_on_fatal_error && interactive_shell)
+ sh_longjmp (evalbuf, 1);
+
+ if (interactive_shell)
+ {
+ expr_unwind ();
+ top_level_cleanup ();
+ jump_to_top_level (DISCARD);
+ }
+ else
+ jump_to_top_level (FORCE_EOF);
+ }
+
+#if defined (ARRAY_VARS)
+ ind = -1;
+ /* Second argument of 0 to get_array_value means that we don't allow
+ references like array[@]. In this case, get_array_value is just
+ like get_variable_value in that it does not return newly-allocated
+ memory or quote the results. */
+ value = (e == ']') ? get_array_value (tok, 0, (int *)NULL, &ind) : get_variable_value (v);
+#else
+ value = get_variable_value (v);
+#endif
+
+ tval = (value && *value) ? subexpr (value) : 0;
+
+ if (lvalue)
+ {
+ lvalue->tokstr = tok; /* XXX */
+ lvalue->tokval = tval;
+ lvalue->tokvar = v; /* XXX */
+#if defined (ARRAY_VARS)
+ lvalue->ind = ind;
+#else
+ lvalue->ind = -1;
+#endif
+ }
+
+ return (tval);
+}
+
+static int
+_is_multiop (c)
+ int c;
+{
+ switch (c)
+ {
+ case EQEQ:
+ case NEQ:
+ case LEQ:
+ case GEQ:
+ case LAND:
+ case LOR:
+ case LSH:
+ case RSH:
+ case OP_ASSIGN:
+ case COND:
+ case POWER:
+ case PREINC:
+ case PREDEC:
+ case POSTINC:
+ case POSTDEC:
+ return 1;
+ default:
+ return 0;
+ }
+}
+
+static int
+_is_arithop (c)
+ int c;
+{
+ switch (c)
+ {
+ case EQ:
+ case GT:
+ case LT:
+ case PLUS:
+ case MINUS:
+ case MUL:
+ case DIV:
+ case MOD:
+ case NOT:
+ case LPAR:
+ case RPAR:
+ case BAND:
+ case BOR:
+ case BXOR:
+ case BNOT:
+ return 1; /* operator tokens */
+ case QUES:
+ case COL:
+ case COMMA:
+ return 1; /* questionable */
+ default:
+ return 0; /* anything else is invalid */
+ }
+}
+
/* Lexical analyzer/token reader for the expression evaluator. Reads the
next token and puts its value into curtok, while advancing past it.
Updates value of tp. May also set tokval (for number) or tokstr (for
static void
readtok ()
{
- register char *cp;
- register int c, c1, e;
+ register char *cp, *xp;
+ register unsigned char c, c1;
+ register int e;
+ struct lvalue lval;
/* Skip leading whitespace. */
cp = tp;
if (c)
cp++;
- lasttp = tp = cp - 1;
-
if (c == '\0')
{
lasttok = curtok;
tp = cp;
return;
}
+ lasttp = tp = cp - 1;
if (legal_variable_starter (c))
{
/* variable names not preceded with a dollar sign are shell variables. */
- char *value, *savecp;
+ char *savecp;
EXPR_CONTEXT ec;
int peektok;
#if defined (ARRAY_VARS)
if (c == '[')
{
- e = skipsubscript (cp, 0);
+ e = skipsubscript (cp, 0, 0);
if (cp[e] == ']')
{
cp += e + 1;
e = ']';
}
else
- evalerror ("bad array subscript");
+ evalerror (bash_badsub_errmsg);
}
#endif /* ARRAY_VARS */
*cp = '\0';
+ /* XXX - watch out for pointer aliasing issues here */
+ if (curlval.tokstr && curlval.tokstr == tokstr)
+ init_lvalue (&curlval);
+
FREE (tokstr);
tokstr = savestring (tp);
*cp = c;
+ /* XXX - make peektok part of saved token state? */
SAVETOK (&ec);
tokstr = (char *)NULL; /* keep it from being freed */
tp = savecp = cp;
noeval = 1;
+ curtok = STR;
readtok ();
peektok = curtok;
if (peektok == STR) /* free new tokstr before old one is restored */
preserve old behavior if a construct like --x=9 is given. */
if (lasttok == PREINC || lasttok == PREDEC || peektok != EQ)
{
-#if defined (ARRAY_VARS)
- value = (e == ']') ? get_array_value (tokstr, 0) : get_string_value (tokstr);
-#else
- value = get_string_value (tokstr);
-#endif
-
- tokval = (value && *value) ? subexpr (value) : 0;
-
-#if defined (ARRAY_VARS)
- if (e == ']')
- FREE (value); /* get_array_value returns newly-allocated memory */
-#endif
+ lastlval = curlval;
+ tokval = expr_streval (tokstr, e, &curlval);
}
else
- tokval = 0;
+ tokval = 0;
lasttok = curtok;
curtok = STR;
}
- else if (digit(c))
+ else if (DIGIT(c))
{
- while (digit (c) || isletter (c) || c == '#' || c == '@' || c == '_')
+ while (ISALNUM (c) || c == '#' || c == '@' || c == '_')
c = *cp++;
c = *--cp;
else if ((c == BOR) && (c1 == BOR))
c = LOR;
else if ((c == '*') && (c1 == '*'))
- c = POWER;
- else if ((c == '-') && (c1 == '-') && legal_variable_starter (*cp))
- c = PREDEC;
- else if ((c == '+') && (c1 == '+') && legal_variable_starter (*cp))
- c = PREINC;
- else if (c1 == EQ && member(c, "*/%+-&^|"))
+ c = POWER;
+ else if ((c == '-' || c == '+') && c1 == c && curtok == STR)
+ c = (c == '-') ? POSTDEC : POSTINC;
+ else if ((c == '-' || c == '+') && c1 == c)
+ {
+ /* Quickly scan forward to see if this is followed by optional
+ whitespace and an identifier. */
+ xp = cp;
+ while (xp && *xp && cr_whitespace (*xp))
+ xp++;
+ if (legal_variable_starter ((unsigned char)*xp))
+ c = (c == '-') ? PREDEC : PREINC;
+ else
+ cp--; /* not preinc or predec, so unget the character */
+ }
+ else if (c1 == EQ && member (c, "*/%+-&^|"))
{
assigntok = c; /* a OP= b */
c = OP_ASSIGN;
}
+ else if (_is_arithop (c) == 0)
+ {
+ cp--;
+ /* use curtok, since it hasn't been copied to lasttok yet */
+ if (curtok == 0 || _is_arithop (curtok) || _is_multiop (curtok))
+ evalerror (_("syntax error: operand expected"));
+ else
+ evalerror (_("syntax error: invalid arithmetic operator"));
+ }
else
cp--; /* `unget' the character */
+
+ /* Should check here to make sure that the current character is one
+ of the recognized operators and flag an error if not. Could create
+ a character map the first time through and check it on subsequent
+ calls. */
lasttok = curtok;
curtok = c;
}
static void
evalerror (msg)
- char *msg;
+ const char *msg;
{
char *name, *t;
name = this_command_name;
for (t = expression; whitespace (*t); t++)
;
- internal_error ("%s%s%s: %s (error token is \"%s\")",
+ internal_error (_("%s%s%s: %s (error token is \"%s\")"),
name ? name : "", name ? ": " : "", t,
msg, (lasttp && *lasttp) ? lasttp : "");
- longjmp (evalbuf, 1);
+ sh_longjmp (evalbuf, 1);
}
-/* Convert a string to a long integer, with an arbitrary base.
+/* Convert a string to an intmax_t integer, with an arbitrary base.
0nnn -> base 8
0[Xx]nn -> base 16
Anything else: [base#]number (this is implemented to match ksh93)
Base may be >=2 and <=64. If base is <= 36, the numbers are drawn
from [0-9][a-zA-Z], and lowercase and uppercase letters may be used
interchangably. If base is > 36 and <= 64, the numbers are drawn
- from [0-9][a-z][A-Z]_@ (a = 10, z = 35, A = 36, Z = 61, _ = 62, @ = 63 --
+ from [0-9][a-z][A-Z]_@ (a = 10, z = 35, A = 36, Z = 61, @ = 62, _ = 63 --
you get the picture). */
-static long
+static intmax_t
strlong (num)
char *num;
{
register char *s;
- register int c;
+ register unsigned char c;
int base, foundbase;
- long val = 0L;
+ intmax_t val;
s = num;
- if (s == NULL || *s == '\0')
- return 0L;
base = 10;
foundbase = 0;
{
s++;
- if (s == NULL || *s == '\0')
- return 0L;
+ if (*s == '\0')
+ return 0;
/* Base 16? */
if (*s == 'x' || *s == 'X')
foundbase++;
}
- val = 0L;
+ val = 0;
for (c = *s++; c; c = *s++)
{
if (c == '#')
{
if (foundbase)
- evalerror ("bad number");
-
- base = (int)val;
+ evalerror (_("invalid number"));
/* Illegal base specifications raise an evaluation error. */
- if (base < 2 || base > 64)
- evalerror ("illegal arithmetic base");
+ if (val < 2 || val > 64)
+ evalerror (_("invalid arithmetic base"));
- val = 0L;
+ base = val;
+ val = 0;
foundbase++;
}
- else if (isletter(c) || digit(c) || (c == '_') || (c == '@'))
+ else if (ISALNUM(c) || (c == '_') || (c == '@'))
{
- if (digit(c))
- c = digit_value(c);
+ if (DIGIT(c))
+ c = TODIGIT(c);
else if (c >= 'a' && c <= 'z')
c -= 'a' - 10;
else if (c >= 'A' && c <= 'Z')
c -= 'A' - ((base <= 36) ? 10 : 36);
- else if (c == '_')
- c = 62;
else if (c == '@')
+ c = 62;
+ else if (c == '_')
c = 63;
if (c >= base)
- evalerror ("value too great for base");
+ evalerror (_("value too great for base"));
val = (val * base) + c;
}
else
break;
}
+
return (val);
}
#if defined (EXPR_TEST)
-char *
+void *
xmalloc (n)
int n;
{
return (malloc (n));
}
-char *
+void *
xrealloc (s, n)
char *s;
int n;
char **argv;
{
register int i;
- long v;
+ intmax_t v;
int expok;
if (setjmp (top_level))
{
v = evalexp (argv[i], &expok);
if (expok == 0)
- fprintf (stderr, "%s: expression error\n", argv[i]);
+ fprintf (stderr, _("%s: expression error\n"), argv[i]);
else
- printf ("'%s' -> %ld\n", argv[i], v);
+ printf ("'%s' -> %ld\n", argv[i], v);
}
exit (0);
}
char *
itos (n)
- int n;
+ intmax_t n;
{
return ("42");
}
projects / thirdparty / bash.git / blobdiff