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/*
* This file is part of ltrace.
* Copyright (C) 2011,2012 Petr Machata, Red Hat Inc.
*
* This program 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 of the
* License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <error.h>
#include <errno.h>
#include "zero.h"
#include "common.h"
#include "type.h"
#include "value.h"
#include "expr.h"
static int
zero_callback_max(struct value *ret_value, struct value *lhs,
struct value_dict *arguments,
size_t max, void *data)
{
size_t i;
for (i = 0; i < max; ++i) {
struct value element;
if (value_init_element(&element, lhs, i) < 0)
return -1;
int zero = value_is_zero(&element, arguments);
value_destroy(&element);
if (zero)
break;
}
struct arg_type_info *long_type = type_get_simple(ARGTYPE_LONG);
value_init_detached(ret_value, NULL, long_type, 0);
value_set_word(ret_value, i);
return 0;
}
/* LHS->zero(RHS). Looks for a length of zero-terminated array, but
* looks no further than first RHS bytes. */
static int
zero_callback(struct value *ret_value, struct value *lhs,
struct value *rhs, struct value_dict *arguments, void *data)
{
long l;
if (value_extract_word(rhs, &l, arguments) < 0)
return -1;
if (l < 0)
/* It might just be a positive value >2GB, but that's
* not likely. */
report_global_error("maximum array length seems negative");
size_t max = (size_t)l;
return zero_callback_max(ret_value, lhs, arguments, max, data);
}
/* LHS->zero. Looks for a length of zero-terminated array, without
* limit. */
static int
zero1_callback(struct value *ret_value, struct value *lhs,
struct value_dict *arguments, void *data)
{
return zero_callback_max(ret_value, lhs, arguments, (size_t)-1, data);
}
struct expr_node *
build_zero_w_arg(struct expr_node *expr, int own)
{
struct expr_node *e_z = malloc(sizeof(*e_z));
if (e_z == NULL)
return NULL;
expr_init_cb2(e_z, &zero_callback,
expr_self(), 0, expr, own, NULL);
return e_z;
}
struct expr_node *
expr_node_zero(void)
{
static struct expr_node *node = NULL;
if (node == NULL) {
node = malloc(sizeof(*node));
if (node == NULL)
error(1, errno, "malloc expr_node_zero");
expr_init_cb1(node, &zero1_callback,
expr_self(), 0, (void *)-1);
}
return node;
}
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